Mercurial > hg > octave-avbm
changeset 2502:b043097d7e04
[project @ 1996-11-13 03:41:37 by jwe]
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new file mode 100644 --- /dev/null +++ b/info/ChangeLog @@ -0,0 +1,38 @@ +Tue Nov 12 14:44:00 1996 John W. Eaton <jwe@bevo.che.wisc.edu> + + * Makefile.in (VPATH): Don't include $(common). + (common): Don't define. + (makeinfo): Define to just be makeinfo. + (LIBS): Don't use libtxi. + (info): Don't depend on ../libtxi.a. + (info.o): Depend on getopt.h, not $(common)/getopt.h. + (.c.o): Don't add -I$(common). + Don't add $(common) for dvi or info targets. + + * configure.in: Copy here from (in texinfo distribution). + + * alloca.c, bzero.c, getopt.c, getopt.h, getopt1.c, memcpy.c, + memmove.c, str + dup.c: Copy here from ../libtxi (in texinfo + distribution). + * Makefile.in: Don't link to files in libtxi. Instead, include + them in SRCS, HDRS, and OBJS. + + * session.c (initialize_info_session): New arg, + clear_screen. Change all callers. + + * info.c (main): Handle new option, --index-search STRING. + (index_search_p, index_search_string): New static variables, used + to handle --index-search option. + + * indices.h (do_info_index_search, index_intry_exists): + Provide declarations here. + + * indices.c (do_info_index_search): New function, extracted + from info_index_search. + (info_index_search): Simply call do_info_index_search() with + search_string set to NULL. + (index_entry_exists): New function. + +For a list of other changes, see the ChangeLog from the texinfo-3.9 +distribution.
new file mode 100644 --- /dev/null +++ b/info/Makefile.in @@ -0,0 +1,227 @@ +# Makefile for texinfo/info. -*- Indented-Text -*- +# $Id: Makefile.in,v 1.28 1996-11-13 03:41:37 jwe Exp $ +# +# Copyright (C) 1993,96 Free Software Foundation, Inc. + +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2, or (at your option) +# any later version. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. + +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +#### Start of system configuration section. #### + +srcdir = @srcdir@ +VPATH = $(srcdir) + +util = $(srcdir)/../util + +CC = @CC@ + +INSTALL = @INSTALL@ +INSTALL_PROGRAM = @INSTALL_PROGRAM@ +INSTALL_DATA = @INSTALL_DATA@ + +LN = ln +RM = rm -f +MKDIR = mkdir +MAKEINFO= makeinfo + +DEFS = @DEFS@ + +LDEFS = -DHANDLE_MAN_PAGES -DNAMED_FUNCTIONS=1 -DDEFAULT_INFOPATH='"$(DEFAULT_INFOPATH)"' + +TERMLIBS = @TERMLIBS@ +LIBS = $(TERMLIBS) @LIBS@ +LOADLIBES = $(LIBS) + +SHELL = /bin/sh + +CFLAGS = @CFLAGS@ +LDFLAGS = @LDFLAGS@ + +prefix = @prefix@ +exec_prefix = @exec_prefix@ +bindir = $(exec_prefix)/bin +# Prefix for each installed program, normally empty or `g'. +binprefix = +# Prefix for each installed man page, normally empty or `g'. +manprefix = +mandir = $(prefix)/man/man1 +manext = 1 +infodir = $(prefix)/info +DEFAULT_INFOPATH= $(infodir):. + +#### End of system configuration section. #### + +SRCS = dir.c display.c echo_area.c filesys.c \ + info-utils.c info.c infodoc.c infomap.c \ + m-x.c nodes.c search.c session.c \ + signals.c terminal.c tilde.c window.c \ + xmalloc.c indices.c makedoc.c nodemenu.c \ + footnotes.c dribble.c variables.c gc.c man.c \ + clib.c getopt.c getopt1.c bzero.c + +HDRS = display.h doc.h echo_area.h filesys.h \ + general.h getopt.h info-utils.h info.h \ + infomap.h nodes.h search.h session.h \ + signals.h termdep.h terminal.h tilde.h \ + indices.h window.h footnotes.h dribble.h \ + variables.h gc.h clib.h getopt.h + +OBJS = dir.o display.o doc.o echo_area.o filesys.o info-utils.o info.o \ + infodoc.o infomap.o m-x.o nodes.o search.o session.o signals.o \ + terminal.o tilde.o window.o indices.o xmalloc.o nodemenu.o \ + footnotes.o dribble.o variables.o gc.o man.o clib.o \ + getopt.o getopt1.o bzero.o $(ALLOCA) $(LIBOBJS) + +# The names of files which declare info commands. +CMDFILES = $(srcdir)/session.c $(srcdir)/echo_area.c $(srcdir)/infodoc.c \ + $(srcdir)/m-x.c $(srcdir)/indices.c $(srcdir)/nodemenu.c \ + $(srcdir)/footnotes.c $(srcdir)/variables.c + +# The name of the program which builds documentation structure from CMDFILES. +MAKEDOC_OBJECTS = makedoc.o clib.o xmalloc.o +MAKEDOC_SOURCE = makedoc.c clib.c xmalloc.c + +infofiles = info.info info-stnd.info + +.c.o: + $(CC) -c $(CPPFLAGS) $(LDEFS) $(DEFS) -I. -I$(srcdir) $(CFLAGS) $< + +all: info $(infofiles) +sub-all: all + +install: all + $(INSTALL_PROGRAM) info $(bindir)/$(binprefix)info + -d=$(srcdir); test -f ./info.info && d=.; $(INSTALL_DATA) $$d/info.info $(infodir)/info.info + -d=$(srcdir); test -f ./info-stnd.info && d=.; $(INSTALL_DATA) $$d/info-stnd.info $(infodir)/info-stnd.info + -$(INSTALL_DATA) $(srcdir)/info.1 $(mandir)/$(manprefix)info.$(manext) + $(POST_INSTALL) + ../util/install-info --info-dir=$(infodir) $(infodir)/info.info + ../util/install-info --info-dir=$(infodir) $(infodir)/info-stnd.info + +uninstall: + $(RM) $(bindir)/info + $(RM) $(infodir)/info.info + $(RM) $(infodir)/info-stnd.info + $(RM) $(mandir)/$(manprefix)info.$(manext) + +info: $(OBJS) + $(CC) $(LDFLAGS) -o info $(OBJS) $(LOADLIBES) + +all-info: info.info info-stnd.info + +info.info: info.texi + $(MAKEINFO) --no-split -I$(srcdir) info.texi + +info-stnd.info: info-stnd.texi + $(MAKEINFO) --no-split -I$(srcdir) info-stnd.texi + +dvi all-dvi: info.dvi info-stnd.dvi +info.dvi: info.texi + PATH="$(util):$${PATH}" TEXINPUTS="$(srcdir):$${TEXINPUTS}" texi2dvi $(srcdir)/info.texi + +info-stnd.dvi: info-stnd.texi + PATH="$(util):$${PATH}" TEXINPUTS="$(srcdir):$${TEXINPUTS}" texi2dvi $(srcdir)/info-stnd.texi + +makedoc: $(MAKEDOC_OBJECTS) + $(CC) $(LDFLAGS) -o makedoc $(MAKEDOC_OBJECTS) $(LOADLIBES) + +Makefile: $(srcdir)/Makefile.in ../config.status + cd ..; sh config.status + +clean: + $(RM) info funs.h doc.c makedoc $(OBJS) $(MAKEDOC_OBJECTS) + +distclean: clean texclean + $(RM) Makefile config.status config.cache *~ core core.* *.core + $(RM) *.BAK makedoc-TAGS TAGS \#* *.info* + +mostlyclean: clean + +realclean: distclean + $(RM) info.info info-stnd.info + +TAGS: $(SRCS) makedoc-TAGS + etags $(SRCS) + cat makedoc-TAGS >>TAGS && $(RM) makedoc-TAGS + +makedoc-TAGS: $(CMDFILES) + ./makedoc -tags $(CMDFILES) >makedoc-TAGS + +texclean: + $(RM) *.toc *.aux *.log *.cp *.fn *.tp *.vr *.pg *.ky *.cps + $(RM) *.tps *.fns *.kys *.pgs *.vrs + +check: info + +# The files `doc.c' and `funs.h' are created by ./makedoc run over the source +# files which contain DECLARE_INFO_COMMAND. `funs.h' is a header file +# listing the functions found. `doc.c' is a structure containing pointers +# to those functions along with completable names and documentation strings. +funs.h: makedoc $(CMDFILES) + -@if test -f funs.h; then mv -f funs.h old-funs.h; fi; : + -@if test -f doc.c; then mv -f doc.c old-doc.c; fi; : + ./makedoc $(CMDFILES) + -@if cmp -s old-funs.h funs.h; then mv old-funs.h funs.h; \ + else $(RM) old-funs.h; fi; : + -@if cmp -s old-doc.c doc.c; then mv old-doc.c doc.c; \ + else $(RM) old-doc.c; fi; : + +doc.c: funs.h +dribble.o: dribble.c dribble.h +display.o: display.c +echo_area.o: echo_area.c +filesys.o: filesys.c +info-utils.o: info-utils.c +info.o: info.c filesys.h +infodoc.o: infodoc.c +infomap.o: infomap.c +m-x.o: m-x.c +nodes.o: nodes.c +search.o: search.c +session.o: session.c +signals.o: signals.c +terminal.o: terminal.c +tilde.o: tilde.c +window.o: window.c +xmalloc.o: xmalloc.c +indices.o: indices.c +makedoc.o: makedoc.c + +dir.o: dir.c +display.o: nodes.h info-utils.h search.h +display.o: terminal.h window.h display.h +echo_area.o: info.h +filesys.o: general.h tilde.h filesys.h +footnotes.o: footnotes.h +info-utils.o: info-utils.h nodes.h search.h +info.o: info.h getopt.h +infodoc.o: info.h doc.h +infomap.o: infomap.h funs.h +gc.o: info.h +m-x.o: info.h +nodes.o: search.h filesys.h +nodes.o: nodes.h info-utils.h +search.o: general.h search.h nodes.h +session.o: info.h +signals.o: info.h signals.h +terminal.o: terminal.h termdep.h +tilde.o: tilde.h +variables.c: variables.h +window.o: nodes.h window.h display.h +window.o: info-utils.h search.h infomap.h + +# Prevent GNU make v3 from overflowing arg limit on SysV. +.NOEXPORT: + +# eof
new file mode 100644 --- /dev/null +++ b/info/NEWS @@ -0,0 +1,200 @@ +This release of Info is version 2.11. Please read the file README. + +Version 2.11, Sat Apr 1 09:15:21 1995 + +Changes since 2.7 beta: + +Although the basic code remains the same, there are numerous nits +fixed, including some display bugs, and a memory leak. Some changes +that have taken place with larger impact include the way in which the +(dir) node is built; I have added in support for "localdir" +directories among other things. Info files may be stored in +compressed formats, and in their own subdirectories; menu items which +do not explicitly name the node to which they are attached have the +menu item name looked up as an Info file if it is not found within the +current document. This means that the menu item: + +* Info:: The Info documentation reader. + +in (dir) refers to the info node "(info)Top". + +Please see the ChangeLog and documentation for details on other +changes. + +Version 2.7 beta, Wed Dec 30 02:02:38 1992 +Version 2.6 beta, Tue Dec 22 03:58:07 1992 +Version 2.5 beta, Tue Dec 8 14:50:35 1992 +Version 2.4 beta, Sat Nov 28 14:34:02 1992 +Version 2.3 beta, Fri Nov 27 01:04:13 1992 +Version 2.2 beta, Tue Nov 24 09:36:08 1992 +Version 2.1 beta, Tue Nov 17 23:29:36 1992 + +Changes since 2.5 beta: + +Note that versions 2.6 and 2.7 Beta were only released to a select group. + +* "info-" removed from the front of M-x commands. + +* Automatic footnote display. When you enter a node which contains + footnotes, and the variable "automatic-footnotes" is "On", Info pops + up a window containing the footnotes. Likewise, when you leave that + node, the window containing the footnotes goes away. + +* Cleaner built in documentation, and documentation functions. + + Use: + o `M-x describe-variable' to read a variable's documenation + o `M-x describe-key' to find out what a particular keystroke does. + o `M-x describe-function' to read a function's documentation. + o `M-x where-is' to find out what keys invoke a particular function. + +* Info can "tile" the displayed windows (via "M-x tile-windows"). If + the variable "automatic-tiling" is "On", then splitting a window or + deleting a window causes the remaining windows to be retiled. + +* You can save every keystroke you type in a "dribble file" by using the + `--dribble FILENAME' option. You can initially read keystrokes from an + alternate input stream with `--restore FILENAME', or by redirecting + input on the command line `info < old-dribble'. + +* New behaviour of menu items. If the label is the same as the + target node name, and the node couldn't be found in the current file, + treat the label as a file name. For example, a menu entry in "DIR" + might contain: + + * Emacs:: Cool text-editor. + + Info would not find the node "(dir)Emacs", so just plain "(emacs)" + would be tried. + +* New variable "ISO-Latin" allows you to use European machines with + 8-bit character sets. + +* Cleanups in echo area reading, and redisplay. Cleanups in handling the + window which shows possible completions. + +* Info can now read files that have been compressed. An array in filesys.c + maps extensions to programs that can decompress stdin, and write the results + to stdout. Currently, ".Z"/uncompress, ".z"/gunzip, and ".Y"/unyabba are + supported. The modeline for a compressed file shows "zz" in it. + +* There is a new variable "gc-compressed-files" which, if non-zero, says + it is okay to reclaim the file buffer space allocated to a file which + was compressed, if, and only if, that file's contents do not appear in + any history node. + +* New file `nodemenu.c' implements a few functions for manipulating + previously visited nodes. `C-x C-b' (list-visited-nodes) produces a + menu of the nodes that could be reached by info-history-node in some + window. `C-x b' (select-visited-node) is similar, but reads one of + the node names with completion. + +* Keystroke `M-r' (move_to_screen_line) allows the user to place the cursor at + the start of a specific screen line. Without a numeric argument, place the + cursor on the center line; with an arg, place the cursor on that line. + +* Interruptible display implemented. Basic display speedups and hacks. +* The message "*** Tags Out of Date ***" now means what it says. +* Index searching with `,' (info-index-next) has been improved. +* When scrolling with C-v, C-M-v, or M-v, only "Page Only" scrolling + will happen. + +* Continous scrolling (along with `]' (info-global-next) and `[' + (info-global-prev) works better. `]' and `[' accept numeric + arguments, moving that many nodes in that case. + +* `C-x w' (info-toggle-wrap) controls how lines wider than the width + of the screen are displayed. If a line is too long, a `$' is + displayed in the rightmost column of the window. + +* There are some new variables for controlling the behaviour of Info + interactively. The current list of variables is as follows: + + Variable Name Default Value Description + ------------- ------------- ----------- + `automatic-footnotes' On When "On", footnotes appear and + disappear automatically. + + `automatic-tiling' Off When "On", creating of deleting a + window resizes other windows. + + `visible-bell' Off If non-zero, try to use a visible bell. + + `errors-ring-bell' On If non-zero, errors cause a ring. + + `show-index-match' On If non-zero, the portion of the string + matched is highlighted by changing its + case. + + `scroll-behaviour' Continuous One of "Continuous", "Next Only", or + "Page Only". "Page Only" prevents you from + scrolling past the bottom or top of a node. + "Next Only" causes the Next or Prev node to + be selected when you scroll past the bottom + or top of a node. "Continous" moves + linearly through the files hierchichal + structure. + + `scroll-step' 0 Controls how scrolling is done for you when + the cursor moves out of the current window. + Non-zero means it is the number of lines + you would like the screen to shift. A + value of 0 means to center the line + containing the cursor in the window. + + `gc-compressed-files' Off If non-zero means it is okay to reclaim the + file buffer space allocated to a file which + was compressed, if, and only if, that + file's contents do not appear in the node + list of any window. + + `ISO-Latin' Off Non-zero means that you are using an ISO + Latin character set. By default, standard + ASCII characters are assumed. +________________________________________ +This release of Info is version 2.5 beta. + +Changes since 2.4 beta: + +* Index (i) and (,) commands fully implemented. +* "configure" script now shipped with Info. +* New function "set-variable" allows users to set various variables. +* User-settable behaviour on end or beginning of node scrolling. This + supercedes the SPC and DEL changes in 2.3 beta. + +________________________________________ +This release of Info is version 2.4 beta. + +Changes since 2.3 beta: + +* info-last-node now means move to the last node of this info file. +* info-history-node means move backwards through this window's node history. +* info-first-node moves to the first node in the Info file. This node is + not necessarily "Top"! +* SPC and DEL can select the Next or Prev node after printing an informative + message when pressed at the end/beg of a node. + +---------------------------------------- +This release of Info is version 2.3 beta. + +Changes since 2.2 beta: + +* M-x command lines if NAMED_COMMANDS is #defined. Variable in Makefile. +* Screen height changes made quite robust. +* Interactive function "set-screen-height" implements user height changes. +* Scrolling on some terminals is faster now. +* C-l with numeric arguement is fixed. + +---------------------------------------- +This release of Info is version 2.2 beta. + +Changes since 2.0: + +* C-g can now interrupt multi-file searches. +* Incremental search is fully implemented. +* Loading large tag tables is much faster now. +* makedoc.c replaces shell script, speeding incremental builds. +* Scrolling in redisplay is implemented. +* Recursive uses of the echo area made more robust. +* Garbage collection of unreferenced nodes. +
new file mode 100644 --- /dev/null +++ b/info/README @@ -0,0 +1,37 @@ +The file NEWS contains information about what has changed since the last +release. + +The file ../INSTALL contains instructions on how to install Info. + + +Info 2.0 is a complete rewrite of the original standalone Info I wrote in +1987, the first program I wrote for rms. That program was something like +my second Unix program ever, and my die-hard machine language coding habits +tended to show through. I found the original Info hard to read and +maintain, and thus decided to write this one. + +The rewrite consists of about 12,000 lines of code written in about 12 +days. I believe this version of Info to be in much better shape than the +original Info, and the only reason it is in Beta test is because of its +short life span. + +Info 2.0 is substantially different from its original standalone +predecessor. It appears almost identical to the GNU Emacs version, but has +the advantages of smaller size, ease of portability, and a built in library +which can be used in other programs (to get or display documentation from +Info files, for example). + +I eagerly await responses to this newer version of Info; comments on its +portability, ease of use and user interface, code quality, and general +usefulness are all of interest to me, and I will appreciate any comments +that you would care to make. + +A full listing of the commands available in Info can be gotten by typing +`?' while within an Info window. This produces a node in a window which +can be viewed just like any Info node. + +Please send your comments, bug reports, and suggestions to + + bug-texinfo@prep.ai.mit.edu + +--Brian Fox <bfox@ai.mit.edu>
new file mode 100644 --- /dev/null +++ b/info/alloca.c @@ -0,0 +1,504 @@ +/* alloca.c -- allocate automatically reclaimed memory + (Mostly) portable public-domain implementation -- D A Gwyn + + This implementation of the PWB library alloca function, + which is used to allocate space off the run-time stack so + that it is automatically reclaimed upon procedure exit, + was inspired by discussions with J. Q. Johnson of Cornell. + J.Otto Tennant <jot@cray.com> contributed the Cray support. + + There are some preprocessor constants that can + be defined when compiling for your specific system, for + improved efficiency; however, the defaults should be okay. + + The general concept of this implementation is to keep + track of all alloca-allocated blocks, and reclaim any + that are found to be deeper in the stack than the current + invocation. This heuristic does not reclaim storage as + soon as it becomes invalid, but it will do so eventually. + + As a special case, alloca(0) reclaims storage without + allocating any. It is a good idea to use alloca(0) in + your main control loop, etc. to force garbage collection. */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#ifdef HAVE_STRING_H +#include <string.h> +#endif +#ifdef HAVE_STDLIB_H +#include <stdlib.h> +#endif + +#ifdef emacs +#include "blockinput.h" +#endif + +/* If compiling with GCC 2, this file's not needed. */ +#if !defined (__GNUC__) || __GNUC__ < 2 + +/* If someone has defined alloca as a macro, + there must be some other way alloca is supposed to work. */ +#ifndef alloca + +#ifdef emacs +#ifdef static +/* actually, only want this if static is defined as "" + -- this is for usg, in which emacs must undefine static + in order to make unexec workable + */ +#ifndef STACK_DIRECTION +you +lose +-- must know STACK_DIRECTION at compile-time +#endif /* STACK_DIRECTION undefined */ +#endif /* static */ +#endif /* emacs */ + +/* If your stack is a linked list of frames, you have to + provide an "address metric" ADDRESS_FUNCTION macro. */ + +#if defined (CRAY) && defined (CRAY_STACKSEG_END) +long i00afunc (); +#define ADDRESS_FUNCTION(arg) (char *) i00afunc (&(arg)) +#else +#define ADDRESS_FUNCTION(arg) &(arg) +#endif + +#if __STDC__ +typedef void *pointer; +#else +typedef char *pointer; +#endif + +#ifndef NULL +#define NULL 0 +#endif + +/* Different portions of Emacs need to call different versions of + malloc. The Emacs executable needs alloca to call xmalloc, because + ordinary malloc isn't protected from input signals. On the other + hand, the utilities in lib-src need alloca to call malloc; some of + them are very simple, and don't have an xmalloc routine. + + Non-Emacs programs expect this to call use xmalloc. + + Callers below should use malloc. */ + +#ifndef emacs +#define malloc xmalloc +#endif +extern pointer malloc (); + +/* Define STACK_DIRECTION if you know the direction of stack + growth for your system; otherwise it will be automatically + deduced at run-time. + + STACK_DIRECTION > 0 => grows toward higher addresses + STACK_DIRECTION < 0 => grows toward lower addresses + STACK_DIRECTION = 0 => direction of growth unknown */ + +#ifndef STACK_DIRECTION +#define STACK_DIRECTION 0 /* Direction unknown. */ +#endif + +#if STACK_DIRECTION != 0 + +#define STACK_DIR STACK_DIRECTION /* Known at compile-time. */ + +#else /* STACK_DIRECTION == 0; need run-time code. */ + +static int stack_dir; /* 1 or -1 once known. */ +#define STACK_DIR stack_dir + +static void +find_stack_direction () +{ + static char *addr = NULL; /* Address of first `dummy', once known. */ + auto char dummy; /* To get stack address. */ + + if (addr == NULL) + { /* Initial entry. */ + addr = ADDRESS_FUNCTION (dummy); + + find_stack_direction (); /* Recurse once. */ + } + else + { + /* Second entry. */ + if (ADDRESS_FUNCTION (dummy) > addr) + stack_dir = 1; /* Stack grew upward. */ + else + stack_dir = -1; /* Stack grew downward. */ + } +} + +#endif /* STACK_DIRECTION == 0 */ + +/* An "alloca header" is used to: + (a) chain together all alloca'ed blocks; + (b) keep track of stack depth. + + It is very important that sizeof(header) agree with malloc + alignment chunk size. The following default should work okay. */ + +#ifndef ALIGN_SIZE +#define ALIGN_SIZE sizeof(double) +#endif + +typedef union hdr +{ + char align[ALIGN_SIZE]; /* To force sizeof(header). */ + struct + { + union hdr *next; /* For chaining headers. */ + char *deep; /* For stack depth measure. */ + } h; +} header; + +static header *last_alloca_header = NULL; /* -> last alloca header. */ + +/* Return a pointer to at least SIZE bytes of storage, + which will be automatically reclaimed upon exit from + the procedure that called alloca. Originally, this space + was supposed to be taken from the current stack frame of the + caller, but that method cannot be made to work for some + implementations of C, for example under Gould's UTX/32. */ + +pointer +alloca (size) + unsigned size; +{ + auto char probe; /* Probes stack depth: */ + register char *depth = ADDRESS_FUNCTION (probe); + +#if STACK_DIRECTION == 0 + if (STACK_DIR == 0) /* Unknown growth direction. */ + find_stack_direction (); +#endif + + /* Reclaim garbage, defined as all alloca'd storage that + was allocated from deeper in the stack than currently. */ + + { + register header *hp; /* Traverses linked list. */ + +#ifdef emacs + BLOCK_INPUT; +#endif + + for (hp = last_alloca_header; hp != NULL;) + if ((STACK_DIR > 0 && hp->h.deep > depth) + || (STACK_DIR < 0 && hp->h.deep < depth)) + { + register header *np = hp->h.next; + + free ((pointer) hp); /* Collect garbage. */ + + hp = np; /* -> next header. */ + } + else + break; /* Rest are not deeper. */ + + last_alloca_header = hp; /* -> last valid storage. */ + +#ifdef emacs + UNBLOCK_INPUT; +#endif + } + + if (size == 0) + return NULL; /* No allocation required. */ + + /* Allocate combined header + user data storage. */ + + { + register pointer new = malloc (sizeof (header) + size); + /* Address of header. */ + + if (new == 0) + abort(); + + ((header *) new)->h.next = last_alloca_header; + ((header *) new)->h.deep = depth; + + last_alloca_header = (header *) new; + + /* User storage begins just after header. */ + + return (pointer) ((char *) new + sizeof (header)); + } +} + +#if defined (CRAY) && defined (CRAY_STACKSEG_END) + +#ifdef DEBUG_I00AFUNC +#include <stdio.h> +#endif + +#ifndef CRAY_STACK +#define CRAY_STACK +#ifndef CRAY2 +/* Stack structures for CRAY-1, CRAY X-MP, and CRAY Y-MP */ +struct stack_control_header + { + long shgrow:32; /* Number of times stack has grown. */ + long shaseg:32; /* Size of increments to stack. */ + long shhwm:32; /* High water mark of stack. */ + long shsize:32; /* Current size of stack (all segments). */ + }; + +/* The stack segment linkage control information occurs at + the high-address end of a stack segment. (The stack + grows from low addresses to high addresses.) The initial + part of the stack segment linkage control information is + 0200 (octal) words. This provides for register storage + for the routine which overflows the stack. */ + +struct stack_segment_linkage + { + long ss[0200]; /* 0200 overflow words. */ + long sssize:32; /* Number of words in this segment. */ + long ssbase:32; /* Offset to stack base. */ + long:32; + long sspseg:32; /* Offset to linkage control of previous + segment of stack. */ + long:32; + long sstcpt:32; /* Pointer to task common address block. */ + long sscsnm; /* Private control structure number for + microtasking. */ + long ssusr1; /* Reserved for user. */ + long ssusr2; /* Reserved for user. */ + long sstpid; /* Process ID for pid based multi-tasking. */ + long ssgvup; /* Pointer to multitasking thread giveup. */ + long sscray[7]; /* Reserved for Cray Research. */ + long ssa0; + long ssa1; + long ssa2; + long ssa3; + long ssa4; + long ssa5; + long ssa6; + long ssa7; + long sss0; + long sss1; + long sss2; + long sss3; + long sss4; + long sss5; + long sss6; + long sss7; + }; + +#else /* CRAY2 */ +/* The following structure defines the vector of words + returned by the STKSTAT library routine. */ +struct stk_stat + { + long now; /* Current total stack size. */ + long maxc; /* Amount of contiguous space which would + be required to satisfy the maximum + stack demand to date. */ + long high_water; /* Stack high-water mark. */ + long overflows; /* Number of stack overflow ($STKOFEN) calls. */ + long hits; /* Number of internal buffer hits. */ + long extends; /* Number of block extensions. */ + long stko_mallocs; /* Block allocations by $STKOFEN. */ + long underflows; /* Number of stack underflow calls ($STKRETN). */ + long stko_free; /* Number of deallocations by $STKRETN. */ + long stkm_free; /* Number of deallocations by $STKMRET. */ + long segments; /* Current number of stack segments. */ + long maxs; /* Maximum number of stack segments so far. */ + long pad_size; /* Stack pad size. */ + long current_address; /* Current stack segment address. */ + long current_size; /* Current stack segment size. This + number is actually corrupted by STKSTAT to + include the fifteen word trailer area. */ + long initial_address; /* Address of initial segment. */ + long initial_size; /* Size of initial segment. */ + }; + +/* The following structure describes the data structure which trails + any stack segment. I think that the description in 'asdef' is + out of date. I only describe the parts that I am sure about. */ + +struct stk_trailer + { + long this_address; /* Address of this block. */ + long this_size; /* Size of this block (does not include + this trailer). */ + long unknown2; + long unknown3; + long link; /* Address of trailer block of previous + segment. */ + long unknown5; + long unknown6; + long unknown7; + long unknown8; + long unknown9; + long unknown10; + long unknown11; + long unknown12; + long unknown13; + long unknown14; + }; + +#endif /* CRAY2 */ +#endif /* not CRAY_STACK */ + +#ifdef CRAY2 +/* Determine a "stack measure" for an arbitrary ADDRESS. + I doubt that "lint" will like this much. */ + +static long +i00afunc (long *address) +{ + struct stk_stat status; + struct stk_trailer *trailer; + long *block, size; + long result = 0; + + /* We want to iterate through all of the segments. The first + step is to get the stack status structure. We could do this + more quickly and more directly, perhaps, by referencing the + $LM00 common block, but I know that this works. */ + + STKSTAT (&status); + + /* Set up the iteration. */ + + trailer = (struct stk_trailer *) (status.current_address + + status.current_size + - 15); + + /* There must be at least one stack segment. Therefore it is + a fatal error if "trailer" is null. */ + + if (trailer == 0) + abort (); + + /* Discard segments that do not contain our argument address. */ + + while (trailer != 0) + { + block = (long *) trailer->this_address; + size = trailer->this_size; + if (block == 0 || size == 0) + abort (); + trailer = (struct stk_trailer *) trailer->link; + if ((block <= address) && (address < (block + size))) + break; + } + + /* Set the result to the offset in this segment and add the sizes + of all predecessor segments. */ + + result = address - block; + + if (trailer == 0) + { + return result; + } + + do + { + if (trailer->this_size <= 0) + abort (); + result += trailer->this_size; + trailer = (struct stk_trailer *) trailer->link; + } + while (trailer != 0); + + /* We are done. Note that if you present a bogus address (one + not in any segment), you will get a different number back, formed + from subtracting the address of the first block. This is probably + not what you want. */ + + return (result); +} + +#else /* not CRAY2 */ +/* Stack address function for a CRAY-1, CRAY X-MP, or CRAY Y-MP. + Determine the number of the cell within the stack, + given the address of the cell. The purpose of this + routine is to linearize, in some sense, stack addresses + for alloca. */ + +static long +i00afunc (long address) +{ + long stkl = 0; + + long size, pseg, this_segment, stack; + long result = 0; + + struct stack_segment_linkage *ssptr; + + /* Register B67 contains the address of the end of the + current stack segment. If you (as a subprogram) store + your registers on the stack and find that you are past + the contents of B67, you have overflowed the segment. + + B67 also points to the stack segment linkage control + area, which is what we are really interested in. */ + + stkl = CRAY_STACKSEG_END (); + ssptr = (struct stack_segment_linkage *) stkl; + + /* If one subtracts 'size' from the end of the segment, + one has the address of the first word of the segment. + + If this is not the first segment, 'pseg' will be + nonzero. */ + + pseg = ssptr->sspseg; + size = ssptr->sssize; + + this_segment = stkl - size; + + /* It is possible that calling this routine itself caused + a stack overflow. Discard stack segments which do not + contain the target address. */ + + while (!(this_segment <= address && address <= stkl)) + { +#ifdef DEBUG_I00AFUNC + fprintf (stderr, "%011o %011o %011o\n", this_segment, address, stkl); +#endif + if (pseg == 0) + break; + stkl = stkl - pseg; + ssptr = (struct stack_segment_linkage *) stkl; + size = ssptr->sssize; + pseg = ssptr->sspseg; + this_segment = stkl - size; + } + + result = address - this_segment; + + /* If you subtract pseg from the current end of the stack, + you get the address of the previous stack segment's end. + This seems a little convoluted to me, but I'll bet you save + a cycle somewhere. */ + + while (pseg != 0) + { +#ifdef DEBUG_I00AFUNC + fprintf (stderr, "%011o %011o\n", pseg, size); +#endif + stkl = stkl - pseg; + ssptr = (struct stack_segment_linkage *) stkl; + size = ssptr->sssize; + pseg = ssptr->sspseg; + result += size; + } + return (result); +} + +#endif /* not CRAY2 */ +#endif /* CRAY */ + +#endif /* no alloca */ +#endif /* not GCC version 2 */
new file mode 100644 --- /dev/null +++ b/info/bzero.c @@ -0,0 +1,44 @@ +/* + * Copyright (C) 1993 Free Software Foundation, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, you can either send email to this + * program's author (see below) or write to: The Free Software Foundation, + * Inc.; 59 Temple Place - Suite 330. Boston, MA 02111-1307, USA. + */ + +#if !defined (HAVE_MEMSET) && !defined (HAVE_BZERO) + +void +bzero (b, length) + register char *b; + register int length; +{ +#ifdef VMS /* but this is definitely VMS-specific */ + short zero = 0; + long max_str = 65535; + + while (length > max_str) + { + (void) LIB$MOVC5 (&zero, &zero, &zero, &max_str, b); + length -= max_str; + b += max_str; + } + (void) LIB$MOVC5 (&zero, &zero, &zero, &length, b); +#else + while (length-- > 0) + *b++ = 0; +#endif /* not VMS */ +} + +#endif /* not HAVE_MEMSET && not HAVE_BZERO */
new file mode 100644 --- /dev/null +++ b/info/clib.c @@ -0,0 +1,112 @@ +/* clib.c: Functions which we normally expect to find in the C library. + $Id: clib.c,v 1.1 1996-11-13 03:41:37 jwe Exp $ + + This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1995 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include <stdio.h> + +#if defined (HAVE_UNISTD_H) +#include <unistd.h> +#endif + +#if defined (HAVE_STDLIB_H) +#include <stdlib.h> +#endif + +#if defined (HAVE_STRING_H) +#include <string.h> +#endif + +#include <sys/errno.h> + +extern void *xmalloc (), *xrealloc (); +#include "general.h" + +#if !defined (errno) +extern int errno; +#endif + +#if !defined (HAVE_STRERROR) +extern char *sys_errlist[]; +extern int sys_nerr; + +char * +strerror (num) + int num; +{ + if (num >= sys_nerr) + return (""); + else + return (sys_errlist[num]); +} +#endif /* !HAVE_STRERROR */ + +#if !defined (HAVE_STRCASECMP) +/* This Unix doesn't have the strcasecmp () function. */ +int +strcasecmp (string1, string2) + char *string1, *string2; +{ + char ch1, ch2; + + for (;;) + { + ch1 = *string1++; + ch2 = *string2++; + + if (!(ch1 | ch2)) + return (0); + + ch1 = info_toupper (ch1); + ch2 = info_toupper (ch2); + + if (ch1 != ch2) + return (ch1 - ch2); + } +} + +/* Compare at most COUNT characters from string1 to string2. Case + doesn't matter. */ +int +strncasecmp (string1, string2, count) + char *string1, *string2; + int count; +{ + register char ch1, ch2; + + while (count) + { + ch1 = *string1++; + ch2 = *string2++; + + ch1 = info_toupper (ch1); + ch2 = info_toupper (ch2); + + if (ch1 == ch2) + count--; + else + break; + } + return (count); +} +#endif /* !STRCASECMP */ +
new file mode 100644 --- /dev/null +++ b/info/clib.h @@ -0,0 +1,42 @@ +/* clib.h: Declarations of functions which appear in clib.c (or libc.a). */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1995 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_CLIB_H_) +#define _CLIB_H_ + +#if !defined (HAVE_STRDUP) +extern char *strdup (); +#endif + +#if !defined (HAVE_STRERROR) +extern char *strerror (); +#endif + +#if !defined (HAVE_STRCASECMP) +extern int strcasecmp (); +extern int strncasecmp (); +#endif + +#endif /* !_CLIB_H_ */ + +
new file mode 100644 --- /dev/null +++ b/info/configure.in @@ -0,0 +1,42 @@ +dnl Process this file with autoconf to produce a configure script. +dnl $Id: configure.in,v 1.6 1996-11-13 03:41:38 jwe Exp $ +AC_INIT(info.c) + +dnl Checks for programs. +AC_PROG_GCC_TRADITIONAL +AC_PROG_INSTALL +AC_PROG_RANLIB + +AC_ISC_POSIX +AC_MINIX + +dnl Checks for libraries. +# Needed on sysV68 for sigblock, sigsetmask. +AC_CHECK_LIB(bsd, sigblock) + +TERMLIBS= +for termlib in curses termcap terminfo termlib ; do + AC_CHECK_LIB(${termlib}, tputs, + [TERMLIBS="${TERMLIBS} -l${termlib}"; break]) +done +AC_SUBST(TERMLIBS) + +dnl Checks for header files. +AC_HEADER_STDC +AC_CHECK_HEADERS(unistd.h termios.h termio.h strings.h string.h varargs.h \ + sys/time.h sys/fcntl.h sys/ttold.h sys/ptem.h sys/file.h) + +dnl Checks for typedefs, structures, and compiler characteristics. +AC_TYPE_OFF_T +AC_C_CONST +AC_STRUCT_TM + +dnl Checks for library functions. +AC_FUNC_ALLOCA +AC_FUNC_SETVBUF_REVERSED +AC_CHECK_FUNCS(setvbuf getcwd memset bzero strchr strcasecmp \ + vfprintf vsprintf strerror sigprocmask sigsetmask) +dnl strcasecmp, strerror, xmalloc, xrealloc, probably others should be added. +AC_REPLACE_FUNCS(memcpy memmove strdup) + +AC_OUTPUT(Makefile)
new file mode 100644 --- /dev/null +++ b/info/dir.c @@ -0,0 +1,273 @@ +/* dir.c -- How to build a special "dir" node from "localdir" files. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> +#if defined (HAVE_SYS_FILE_H) +#include <sys/file.h> +#endif /* HAVE_SYS_FILE_H */ +#include <sys/errno.h> +#include "info-utils.h" +#include "filesys.h" +#include "tilde.h" + +/* The "dir" node can be built from the contents of a file called "dir", + with the addition of the menus of every file named in the array + dirs_to_add which are found in INFOPATH. */ + +static void add_menu_to_file_buffer (), insert_text_into_fb_at_binding (); +static void build_dir_node_internal (); + +static char *dirs_to_add[] = { + "dir", "localdir", (char *)NULL +}; + +void +maybe_build_dir_node (dirname) + char *dirname; +{ + FILE_BUFFER *dir_buffer; + int path_index, update_tags; + char *this_dir; + + /* Check to see if the file has already been built. If so, then + do not build it again. */ + dir_buffer = info_find_file (dirname); + + /* If there is no "dir" in the current info path, we cannot build one + from nothing. */ + if (!dir_buffer) + return; + + /* If this directory has already been built, return now. */ + if (dir_buffer->flags & N_CannotGC) + return; + + path_index = update_tags = 0; + + /* Using each element of the path, check for one of the files in + DIRS_TO_ADD. Do not check for "localdir.info.Z" or anything else. + Only files explictly named are eligible. This is a design decision. + There can be an info file name "localdir.info" which contains + information on the setting up of "localdir" files. */ + while (this_dir = extract_colon_unit (infopath, &path_index)) + { + register int da_index; + char *from_file; + + /* Expand a leading tilde if one is present. */ + if (*this_dir == '~') + { + char *tilde_expanded_dirname; + + tilde_expanded_dirname = tilde_expand_word (this_dir); + if (tilde_expanded_dirname != this_dir) + { + free (this_dir); + this_dir = tilde_expanded_dirname; + } + } + + /* For every file named in DIRS_TO_ADD found in the search path, + add the contents of that file's menu to our "dir" node. */ + for (da_index = 0; from_file = dirs_to_add[da_index]; da_index++) + { + struct stat finfo; + char *fullpath; + int namelen, statable; + + namelen = strlen (from_file); + + fullpath = (char *)xmalloc (3 + strlen (this_dir) + namelen); + strcpy (fullpath, this_dir); + if (fullpath[strlen (fullpath) - 1] != '/') + strcat (fullpath, "/"); + strcat (fullpath, from_file); + + statable = (stat (fullpath, &finfo) == 0); + + /* Only add the contents of this file if it is not identical to the + file of the DIR buffer. */ + if ((statable && S_ISREG (finfo.st_mode)) && + (strcmp (dir_buffer->fullpath, fullpath) != 0)) + { + long filesize; + char *contents; + + contents = filesys_read_info_file (fullpath, &filesize, &finfo); + + if (contents) + { + update_tags++; + add_menu_to_file_buffer (contents, filesize, dir_buffer); + free (contents); + } + } + + free (fullpath); + } + free (this_dir); + } + + if (update_tags) + build_tags_and_nodes (dir_buffer); + + /* Flag that the dir buffer has been built. */ + dir_buffer->flags |= N_CannotGC; +} + +/* Given CONTENTS and FB (a file buffer), add the menu found in CONTENTS + to the menu found in FB->contents. Second argument SIZE is the total + size of CONTENTS. */ +static void +add_menu_to_file_buffer (contents, size, fb) + char *contents; + long size; + FILE_BUFFER *fb; +{ + SEARCH_BINDING contents_binding, fb_binding; + long contents_offset, fb_offset; + + contents_binding.buffer = contents; + contents_binding.start = 0; + contents_binding.end = size; + contents_binding.flags = S_FoldCase | S_SkipDest; + + fb_binding.buffer = fb->contents; + fb_binding.start = 0; + fb_binding.end = fb->filesize; + fb_binding.flags = S_FoldCase | S_SkipDest; + + /* Move to the start of the menus in CONTENTS and FB. */ + contents_offset = search_forward (INFO_MENU_LABEL, &contents_binding); + fb_offset = search_forward (INFO_MENU_LABEL, &fb_binding); + + /* If there is no menu in CONTENTS, quit now. */ + if (contents_offset == -1) + return; + + /* There is a menu in CONTENTS, and contents_offset points to the first + character following the menu starter string. Skip all whitespace + and newline characters. */ + contents_offset += skip_whitespace_and_newlines (contents + contents_offset); + + /* If there is no menu in FB, make one. */ + if (fb_offset == -1) + { + /* Find the start of the second node in this file buffer. If there + is only one node, we will be adding the contents to the end of + this node. */ + fb_offset = find_node_separator (&fb_binding); + + /* If not even a single node separator, give up. */ + if (fb_offset == -1) + return; + + fb_binding.start = fb_offset; + fb_binding.start += + skip_node_separator (fb_binding.buffer + fb_binding.start); + + /* Try to find the next node separator. */ + fb_offset = find_node_separator (&fb_binding); + + /* If found one, consider that the start of the menu. Otherwise, the + start of this menu is the end of the file buffer (i.e., fb->size). */ + if (fb_offset != -1) + fb_binding.start = fb_offset; + else + fb_binding.start = fb_binding.end; + + insert_text_into_fb_at_binding + (fb, &fb_binding, INFO_MENU_LABEL, strlen (INFO_MENU_LABEL)); + + fb_binding.buffer = fb->contents; + fb_binding.start = 0; + fb_binding.end = fb->filesize; + fb_offset = search_forward (INFO_MENU_LABEL, &fb_binding); + if (fb_offset == -1) + abort (); + } + + /* CONTENTS_OFFSET and FB_OFFSET point to the starts of the menus that + appear in their respective buffers. Add the remainder of CONTENTS + to the end of FB's menu. */ + fb_binding.start = fb_offset; + fb_offset = find_node_separator (&fb_binding); + if (fb_offset != -1) + fb_binding.start = fb_offset; + else + fb_binding.start = fb_binding.end; + + /* Leave exactly one blank line between directory entries. */ + { + int num_found = 0; + + while ((fb_binding.start > 0) && + (whitespace_or_newline (fb_binding.buffer[fb_binding.start - 1]))) + { + num_found++; + fb_binding.start--; + } + + /* Optimize if possible. */ + if (num_found >= 2) + { + fb_binding.buffer[fb_binding.start++] = '\n'; + fb_binding.buffer[fb_binding.start++] = '\n'; + } + else + { + /* Do it the hard way. */ + insert_text_into_fb_at_binding (fb, &fb_binding, "\n\n", 2); + fb_binding.start += 2; + } + } + + /* Insert the new menu. */ + insert_text_into_fb_at_binding + (fb, &fb_binding, contents + contents_offset, size - contents_offset); +} + +static void +insert_text_into_fb_at_binding (fb, binding, text, textlen) + FILE_BUFFER *fb; + SEARCH_BINDING *binding; + char *text; + int textlen; +{ + char *contents; + long start, end; + + start = binding->start; + end = fb->filesize; + + contents = (char *)xmalloc (fb->filesize + textlen + 1); + memcpy (contents, fb->contents, start); + memcpy (contents + start, text, textlen); + memcpy (contents + start + textlen, fb->contents + start, end - start); + free (fb->contents); + fb->contents = contents; + fb->filesize += textlen; + fb->finfo.st_size = fb->filesize; +}
new file mode 100644 --- /dev/null +++ b/info/display.c @@ -0,0 +1,561 @@ +/* display.c -- How to display Info windows. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include <stdio.h> +#include <ctype.h> +#include <sys/types.h> +#include <sys/stat.h> +#include "display.h" + +extern int info_any_buffered_input_p (); /* Found in session.c. */ + +static void free_display (); +static DISPLAY_LINE **make_display (); + +/* An array of display lines which tell us what is currently visible on + the display. */ +DISPLAY_LINE **the_display = (DISPLAY_LINE **)NULL; + +/* Non-zero means do no output. */ +int display_inhibited = 0; + +/* Initialize THE_DISPLAY to WIDTH and HEIGHT, with nothing in it. */ +void +display_initialize_display (width, height) + int width, height; +{ + free_display (the_display); + the_display = make_display (width, height); + display_clear_display (the_display); +} + +/* Clear all of the lines in DISPLAY making the screen blank. */ +void +display_clear_display (display) + DISPLAY_LINE **display; +{ + register int i; + register DISPLAY_LINE *display_line; + + for (i = 0; display_line = display[i]; i++) + { + display[i]->text[0] = '\0'; + display[i]->textlen = 0; + display[i]->inverse = 0; + } +} + +/* Non-zero if we didn't completely redisplay a window. */ +int display_was_interrupted_p = 0; + +/* Update the windows pointed to by WINDOW in the_display. This actually + writes the text on the screen. */ +void +display_update_display (window) + WINDOW *window; +{ + register WINDOW *win; + + display_was_interrupted_p = 0; + + /* For every window in the list, check contents against the display. */ + for (win = window; win; win = win->next) + { + /* Only re-display visible windows which need updating. */ + if (((win->flags & W_WindowVisible) == 0) || + ((win->flags & W_UpdateWindow) == 0) || + (win->height == 0)) + continue; + + display_update_one_window (win); + if (display_was_interrupted_p) + break; + } + + /* Always update the echo area. */ + display_update_one_window (the_echo_area); +} + +/* Display WIN on the_display. Unlike display_update_display (), this + function only does one window. */ +void +display_update_one_window (win) + WINDOW *win; +{ + register char *nodetext; /* Current character to display. */ + register char *last_node_char; /* Position of the last character in node. */ + register int i; /* General use index. */ + char *printed_line; /* Buffer for a printed line. */ + int pl_index = 0; /* Index into PRINTED_LINE. */ + int line_index = 0; /* Number of lines done so far. */ + DISPLAY_LINE **display = the_display; + + /* If display is inhibited, that counts as an interrupted display. */ + if (display_inhibited) + display_was_interrupted_p = 1; + + /* If the window has no height, or display is inhibited, quit now. */ + if (!win->height || display_inhibited) + return; + + /* If the window's first row doesn't appear in the_screen, then it + cannot be displayed. This can happen when the_echo_area is the + window to be displayed, and the screen has shrunk to less than one + line. */ + if ((win->first_row < 0) || (win->first_row > the_screen->height)) + return; + + /* Print each line in the window into our local buffer, and then + check the contents of that buffer against the display. If they + differ, update the display. */ + printed_line = (char *)xmalloc (1 + win->width); + + if (!win->node || !win->line_starts) + goto done_with_node_display; + + nodetext = win->line_starts[win->pagetop]; + last_node_char = win->node->contents + win->node->nodelen; + + for (; nodetext < last_node_char; nodetext++) + { + char *rep, *rep_carried_over, rep_temp[2]; + int replen; + + if (isprint (*nodetext)) + { + rep_temp[0] = *nodetext; + replen = 1; + rep_temp[1] = '\0'; + rep = rep_temp; + } + else + { + if (*nodetext == '\r' || *nodetext == '\n') + { + replen = win->width - pl_index; + } + else + { + rep = printed_representation (*nodetext, pl_index); + replen = strlen (rep); + } + } + + /* If this character can be printed without passing the width of + the line, then stuff it into the line. */ + if (replen + pl_index < win->width) + { + /* Optimize if possible. */ + if (replen == 1) + { + printed_line[pl_index++] = *rep; + } + else + { + for (i = 0; i < replen; i++) + printed_line[pl_index++] = rep[i]; + } + } + else + { + DISPLAY_LINE *entry; + + /* If this character cannot be printed in this line, we have + found the end of this line as it would appear on the screen. + Carefully print the end of the line, and then compare. */ + if (*nodetext == '\n' || *nodetext == '\r' || *nodetext == '\t') + { + printed_line[pl_index] = '\0'; + rep_carried_over = (char *)NULL; + } + else + { + /* The printed representation of this character extends into + the next line. Remember the offset of the last character + printed out of REP so that we can carry the character over + to the next line. */ + for (i = 0; pl_index < (win->width - 1);) + printed_line[pl_index++] = rep[i++]; + + rep_carried_over = rep + i; + + /* If printing the last character in this window couldn't + possibly cause the screen to scroll, place a backslash + in the rightmost column. */ + if (1 + line_index + win->first_row < the_screen->height) + { + if (win->flags & W_NoWrap) + printed_line[pl_index++] = '$'; + else + printed_line[pl_index++] = '\\'; + } + printed_line[pl_index] = '\0'; + } + + /* We have the exact line as it should appear on the screen. + Check to see if this line matches the one already appearing + on the screen. */ + entry = display[line_index + win->first_row]; + + /* If the screen line is inversed, then we have to clear + the line from the screen first. Why, I don't know. */ + if (entry->inverse) + { + terminal_goto_xy (0, line_index + win->first_row); + terminal_clear_to_eol (); + entry->inverse = 0; + entry->text[0] = '\0'; + entry->textlen = 0; + } + + /* Find the offset where these lines differ. */ + for (i = 0; i < pl_index; i++) + if (printed_line[i] != entry->text[i]) + break; + + /* If the lines are not the same length, or if they differed + at all, we must do some redrawing. */ + if ((i != pl_index) || (pl_index != entry->textlen)) + { + /* Move to the proper point on the terminal. */ + terminal_goto_xy (i, line_index + win->first_row); + + /* If there is any text to print, print it. */ + if (i != pl_index) + terminal_put_text (printed_line + i); + + /* If the printed text didn't extend all the way to the edge + of the window, and text was appearing between here and the + edge of the window, clear from here to the end of the line. */ + if ((pl_index < win->width && pl_index < entry->textlen) || + (entry->inverse)) + terminal_clear_to_eol (); + + fflush (stdout); + + /* Update the display text buffer. */ + strcpy (entry->text + i, printed_line + i); + entry->textlen = pl_index; + + /* Lines showing node text are not in inverse. Only modelines + have that distinction. */ + entry->inverse = 0; + } + + /* We have done at least one line. Increment our screen line + index, and check against the bottom of the window. */ + if (++line_index == win->height) + break; + + /* A line has been displayed, and the screen reflects that state. + If there is typeahead pending, then let that typeahead be read + now, instead of continuing with the display. */ + if (info_any_buffered_input_p ()) + { + free (printed_line); + display_was_interrupted_p = 1; + return; + } + + /* Reset PL_INDEX to the start of the line. */ + pl_index = 0; + + /* If there are characters from REP left to print, stuff them + into the buffer now. */ + if (rep_carried_over) + for (; rep[pl_index]; pl_index++) + printed_line[pl_index] = rep[pl_index]; + + /* If this window has chosen not to wrap lines, skip to the end + of the physical line in the buffer, and start a new line here. */ + if (pl_index && (win->flags & W_NoWrap)) + { + char *begin; + + pl_index = 0; + printed_line[0] = '\0'; + + begin = nodetext; + + while ((nodetext < last_node_char) && (*nodetext != '\n')) + nodetext++; + } + } + } + + done_with_node_display: + /* We have reached the end of the node or the end of the window. If it + is the end of the node, then clear the lines of the window from here + to the end of the window. */ + for (; line_index < win->height; line_index++) + { + DISPLAY_LINE *entry = display[line_index + win->first_row]; + + /* If this line has text on it then make it go away. */ + if (entry && entry->textlen) + { + entry->textlen = 0; + entry->text[0] = '\0'; + + terminal_goto_xy (0, line_index + win->first_row); + terminal_clear_to_eol (); + } + } + + /* Finally, if this window has a modeline it might need to be redisplayed. + Check the window's modeline against the one in the display, and update + if necessary. */ + if ((win->flags & W_InhibitMode) == 0) + { + window_make_modeline (win); + line_index = win->first_row + win->height; + + /* This display line must both be in inverse, and have the same + contents. */ + if ((!display[line_index]->inverse) || + (strcmp (display[line_index]->text, win->modeline) != 0)) + { + terminal_goto_xy (0, line_index); + terminal_begin_inverse (); + terminal_put_text (win->modeline); + terminal_end_inverse (); + strcpy (display[line_index]->text, win->modeline); + display[line_index]->inverse = 1; + display[line_index]->textlen = strlen (win->modeline); + fflush (stdout); + } + } + + /* Okay, this window doesn't need updating anymore. */ + win->flags &= ~W_UpdateWindow; + free (printed_line); + fflush (stdout); +} + +/* Scroll the region of the_display starting at START, ending at END, and + moving the lines AMOUNT lines. If AMOUNT is less than zero, the lines + are moved up in the screen, otherwise down. Actually, it is possible + for no scrolling to take place in the case that the terminal doesn't + support it. This doesn't matter to us. */ +void +display_scroll_display (start, end, amount) + int start, end, amount; +{ + register int i, last; + DISPLAY_LINE *temp; + + /* If this terminal cannot do scrolling, give up now. */ + if (!terminal_can_scroll) + return; + + /* If there isn't anything displayed on the screen because it is too + small, quit now. */ + if (!the_display[0]) + return; + + /* If there is typeahead pending, then don't actually do any scrolling. */ + if (info_any_buffered_input_p ()) + return; + + /* Do it on the screen. */ + terminal_scroll_terminal (start, end, amount); + + /* Now do it in the display buffer so our contents match the screen. */ + if (amount > 0) + { + last = end + amount; + + /* Shift the lines to scroll right into place. */ + for (i = 0; i < (end - start); i++) + { + temp = the_display[last - i]; + the_display[last - i] = the_display[end - i]; + the_display[end - i] = temp; + } + + /* The lines have been shifted down in the buffer. Clear all of the + lines that were vacated. */ + for (i = start; i != (start + amount); i++) + { + the_display[i]->text[0] = '\0'; + the_display[i]->textlen = 0; + the_display[i]->inverse = 0; + } + } + + if (amount < 0) + { + last = start + amount; + for (i = 0; i < (end - start); i++) + { + temp = the_display[last + i]; + the_display[last + i] = the_display[start + i]; + the_display[start + i] = temp; + } + + /* The lines have been shifted up in the buffer. Clear all of the + lines that are left over. */ + for (i = end + amount; i != end; i++) + { + the_display[i]->text[0] = '\0'; + the_display[i]->textlen = 0; + the_display[i]->inverse = 0; + } + } +} + +/* Try to scroll lines in WINDOW. OLD_PAGETOP is the pagetop of WINDOW before + having had its line starts recalculated. OLD_STARTS is the list of line + starts that used to appear in this window. OLD_COUNT is the number of lines + that appear in the OLD_STARTS array. */ +void +display_scroll_line_starts (window, old_pagetop, old_starts, old_count) + WINDOW *window; + int old_pagetop, old_count; + char **old_starts; +{ + register int i, old, new; /* Indices into the line starts arrays. */ + int last_new, last_old; /* Index of the last visible line. */ + int old_first, new_first; /* Index of the first changed line. */ + int unchanged_at_top = 0; + int already_scrolled = 0; + + /* Locate the first line which was displayed on the old window. */ + old_first = old_pagetop; + new_first = window->pagetop; + + /* Find the last line currently visible in this window. */ + last_new = window->pagetop + (window->height - 1); + if (last_new > window->line_count) + last_new = window->line_count - 1; + + /* Find the last line which used to be currently visible in this window. */ + last_old = old_pagetop + (window->height - 1); + if (last_old > old_count) + last_old = old_count - 1; + + for (old = old_first, new = new_first; + old < last_old && new < last_new; + old++, new++) + if (old_starts[old] != window->line_starts[new]) + break; + else + unchanged_at_top++; + + /* Loop through the old lines looking for a match in the new lines. */ + for (old = old_first + unchanged_at_top; old < last_old; old++) + { + for (new = new_first; new < last_new; new++) + if (old_starts[old] == window->line_starts[new]) + { + /* Find the extent of the matching lines. */ + for (i = 0; (old + i) < last_old; i++) + if (old_starts[old + i] != window->line_starts[new + i]) + break; + + /* Scroll these lines if there are enough of them. */ + { + int start, end, amount; + + start = (window->first_row + + ((old + already_scrolled) - old_pagetop)); + amount = new - (old + already_scrolled); + end = window->first_row + window->height; + + /* If we are shifting the block of lines down, then the last + AMOUNT lines will become invisible. Thus, don't bother + scrolling them. */ + if (amount > 0) + end -= amount; + + if ((end - start) > 0) + { + display_scroll_display (start, end, amount); + + /* Some lines have been scrolled. Simulate the scrolling + by offsetting the value of the old index. */ + old += i; + already_scrolled += amount; + } + } + } + } +} + +/* Move the screen cursor to directly over the current character in WINDOW. */ +void +display_cursor_at_point (window) + WINDOW *window; +{ + int vpos, hpos; + + vpos = window_line_of_point (window) - window->pagetop + window->first_row; + hpos = window_get_cursor_column (window); + terminal_goto_xy (hpos, vpos); +} + +/* **************************************************************** */ +/* */ +/* Functions Static to this File */ +/* */ +/* **************************************************************** */ + +/* Make a DISPLAY_LINE ** with width and height. */ +static DISPLAY_LINE ** +make_display (width, height) + int width, height; +{ + register int i; + DISPLAY_LINE **display; + + display = (DISPLAY_LINE **)xmalloc ((1 + height) * sizeof (DISPLAY_LINE *)); + + for (i = 0; i < height; i++) + { + display[i] = (DISPLAY_LINE *)xmalloc (sizeof (DISPLAY_LINE)); + display[i]->text = (char *)xmalloc (1 + width); + display[i]->textlen = 0; + display[i]->inverse = 0; + } + display[i] = (DISPLAY_LINE *)NULL; + return (display); +} + +/* Free the storage allocated to DISPLAY. */ +static void +free_display (display) + DISPLAY_LINE **display; +{ + register int i; + register DISPLAY_LINE *display_line; + + if (!display) + return; + + for (i = 0; display_line = display[i]; i++) + { + free (display_line->text); + free (display_line); + } + free (display); +}
new file mode 100644 --- /dev/null +++ b/info/display.h @@ -0,0 +1,76 @@ +/* display.h -- How the display in Info is done. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_DISPLAY_H_) +#define _DISPLAY_H_ + +#include "info-utils.h" +#include "terminal.h" + +typedef struct { + char *text; /* Text of the line as it appears. */ + int textlen; /* Printable Length of TEXT. */ + int inverse; /* Non-zero means this line is inverse. */ +} DISPLAY_LINE; + +/* An array of display lines which tell us what is currently visible on + the display. */ +extern DISPLAY_LINE **the_display; + +/* Non-zero means do no output. */ +extern int display_inhibited; + +/* Non-zero if we didn't completely redisplay a window. */ +extern int display_was_interrupted_p; + +/* Initialize THE_DISPLAY to WIDTH and HEIGHT, with nothing in it. */ +extern void display_initialize_display (); + +/* Clear all of the lines in DISPLAY making the screen blank. */ +extern void display_clear_display (); + +/* Update the windows pointed to by WINDOWS in THE_DISPLAY. This actually + writes the text on the screen. */ +extern void display_update_display (); + +/* Display WIN on THE_DISPLAY. Unlike display_update_display (), this + function only does one window. */ +extern void display_update_one_window (); + +/* Move the screen cursor to directly over the current character in WINDOW. */ +extern void display_cursor_at_point (); + +/* Scroll the region of the_display starting at START, ending at END, and + moving the lines AMOUNT lines. If AMOUNT is less than zero, the lines + are moved up in the screen, otherwise down. Actually, it is possible + for no scrolling to take place in the case that the terminal doesn't + support it. This doesn't matter to us. */ +extern void display_scroll_display (); + +/* Try to scroll lines in WINDOW. OLD_PAGETOP is the pagetop of WINDOW before + having had its line starts recalculated. OLD_STARTS is the list of line + starts that used to appear in this window. OLD_COUNT is the number of lines + that appear in the OLD_STARTS array. */ +extern void display_scroll_line_starts (); + +#endif /* !_DISPLAY_H_ */
new file mode 100644 --- /dev/null +++ b/info/doc.h @@ -0,0 +1,58 @@ +/* doc.h -- Structure associating function pointers with documentation. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_DOC_H_) +#define _DOC_H_ + +#if !defined (NULL) +# define NULL 0x0 +#endif /* !NULL */ + +#if !defined (__FUNCTION_DEF) +# define __FUNCTION_DEF +typedef int Function (); +typedef void VFunction (); +#endif /* _FUNCTION_DEF */ + +typedef struct { + VFunction *func; +#if defined (NAMED_FUNCTIONS) + char *func_name; +#endif /* NAMED_FUNCTIONS */ + char *doc; +} FUNCTION_DOC; + +extern FUNCTION_DOC function_doc_array[]; + +extern char *function_documentation (); +extern char *key_documentation (); +extern char *pretty_keyname (); +extern char *replace_in_documentation (); +extern void info_document_key (); +extern void dump_map_to_message_buffer (); + +#if defined (NAMED_FUNCTIONS) +extern char *function_name (); +extern VFunction *named_function (); +#endif /* NAMED_FUNCTIONS */ +#endif /* !_DOC_H_ */
new file mode 100644 --- /dev/null +++ b/info/dribble @@ -0,0 +1,5 @@ +mfoo +em +buffers + +ââ \ No newline at end of file
new file mode 100644 --- /dev/null +++ b/info/dribble.c @@ -0,0 +1,71 @@ +/* dribble.c -- Dribble files for Info. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include <stdio.h> +#include "dribble.h" + +/* When non-zero, it is a stream to write all input characters to for the + duration of this info session. */ +FILE *info_dribble_file = (FILE *)NULL; + +/* Open a dribble file named NAME, perhaps closing an already open one. + This sets the global variable INFO_DRIBBLE_FILE to the open stream. */ +void +open_dribble_file (name) + char *name; +{ + /* Perhaps close existing dribble file. */ + close_dribble_file (); + + info_dribble_file = fopen (name, "w"); + +#if defined (HAVE_SETVBUF) + if (info_dribble_file) +# if defined (SETVBUF_REVERSED) + setvbuf (info_dribble_file, _IONBF, (char *)NULL, 1); +# else + setvbuf (info_dribble_file, (char *)NULL, _IONBF, 1); +# endif /* !SETVBUF_REVERSED */ +#endif /* HAVE_SETVBUF */ +} + +/* If there is a dribble file already open, close it. */ +void +close_dribble_file () +{ + if (info_dribble_file) + { + fflush (info_dribble_file); + fclose (info_dribble_file); + info_dribble_file = (FILE *)NULL; + } +} + +/* Write some output to our existing dribble file. */ +void +dribble (byte) + unsigned char byte; +{ + if (info_dribble_file) + fwrite (&byte, sizeof (unsigned char), 1, info_dribble_file); +}
new file mode 100644 --- /dev/null +++ b/info/dribble.h @@ -0,0 +1,41 @@ +/* dribble.h -- Functions and vars declared in dribble.c. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_DRIBBLE_H_) +#define _DRIBBLE_H_ + +/* When non-zero, it is a stream to write all input characters to for the + duration of this info session. */ +extern FILE *info_dribble_file; + +/* Open a dribble file named NAME, perhaps closing an already open one. + This sets the global variable INFO_DRIBBLE_FILE to the open stream. */ +extern void open_dribble_file (); + +/* If there is a dribble file already open, close it. */ +extern void close_dribble_file (); + +/* Write some output to our existing dribble file. */ +extern void dribble (); + +#endif /* !_DRIBBLE_H_ */
new file mode 100644 --- /dev/null +++ b/info/echo_area.c @@ -0,0 +1,1508 @@ +/* echo_area.c -- How to read a line in the echo area. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include "info.h" + +#if defined (FD_SET) +# if defined (hpux) +# define fd_set_cast(x) (int *)(x) +# else +# define fd_set_cast(x) (fd_set *)(x) +# endif /* !hpux */ +#endif /* FD_SET */ + +/* Non-zero means that C-g was used to quit reading input. */ +int info_aborted_echo_area = 0; + +/* Non-zero means that the echo area is being used to read input. */ +int echo_area_is_active = 0; + +/* The address of the last command executed in the echo area. */ +VFunction *ea_last_executed_command = (VFunction *)NULL; + +/* Non-zero means that the last command executed while reading input + killed some text. */ +int echo_area_last_command_was_kill = 0; + +/* Variables which hold on to the current state of the input line. */ +static char input_line[1 + EA_MAX_INPUT]; +static char *input_line_prompt; +static int input_line_point; +static int input_line_beg; +static int input_line_end; +static NODE input_line_node = { + (char *)NULL, (char *)NULL, (char *)NULL, input_line, EA_MAX_INPUT, 0 +}; + +static void echo_area_initialize_node (); +static void push_echo_area (), pop_echo_area (); +static int echo_area_stack_depth (), echo_area_stack_contains_completions_p (); + +static void ea_kill_text (); + +/* Non-zero means we force the user to complete. */ +static int echo_area_must_complete_p = 0; +static int completions_window_p (); + +/* If non-null, this is a window which was specifically created to display + possible completions output. We remember it so we can delete it when + appropriate. */ +static WINDOW *echo_area_completions_window = (WINDOW *)NULL; + +/* Variables which keep track of the window which was active prior to + entering the echo area. */ +static WINDOW *calling_window = (WINDOW *)NULL; +static NODE *calling_window_node = (NODE *)NULL; +static long calling_window_point = 0; +static long calling_window_pagetop = 0; + +/* Remember the node and pertinent variables of the calling window. */ +static void +remember_calling_window (window) + WINDOW *window; +{ + /* Only do this if the calling window is not the completions window, or, + if it is the completions window and there is no other window. */ + if (!completions_window_p (window) || + ((window == windows) && !(window->next))) + { + calling_window = window; + calling_window_node = window->node; + calling_window_point = window->point; + calling_window_pagetop = window->pagetop; + } +} + +/* Restore the caller's window so that it shows the node that it was showing + on entry to info_read_xxx_echo_area (). */ +static void +restore_calling_window () +{ + register WINDOW *win, *compwin = (WINDOW *)NULL; + + /* If the calling window is still visible, and it is the window that + we used for completions output, then restore the calling window. */ + for (win = windows; win; win = win->next) + { + if (completions_window_p (win)) + compwin = win; + + if (win == calling_window && win == compwin) + { + window_set_node_of_window (calling_window, calling_window_node); + calling_window->point = calling_window_point; + calling_window->pagetop = calling_window_pagetop; + compwin = (WINDOW *)NULL; + break; + } + } + + /* Delete the completions window if it is still present, it isn't the + last window on the screen, and there aren't any prior echo area reads + pending which created a completions window. */ + if (compwin) + { + if ((compwin != windows || windows->next) && + !echo_area_stack_contains_completions_p ()) + { + WINDOW *next; + int pagetop, start, end, amount; + + next = compwin->next; + if (next) + { + start = next->first_row; + end = start + next->height; + amount = - (compwin->height + 1); + pagetop = next->pagetop; + } + + info_delete_window_internal (compwin); + + /* This is not necessary because info_delete_window_internal () + calls echo_area_inform_of_deleted_window (), which does the + right thing. */ +#if defined (UNNECESSARY) + echo_area_completions_window = (WINDOW *)NULL; +#endif /* UNNECESSARY */ + + if (next) + { + display_scroll_display (start, end, amount); + next->pagetop = pagetop; + display_update_display (windows); + } + } + } +} + +/* Set up a new input line with PROMPT. */ +static void +initialize_input_line (prompt) + char *prompt; +{ + input_line_prompt = prompt; + if (prompt) + strcpy (input_line, prompt); + else + input_line[0] = '\0'; + + input_line_beg = input_line_end = input_line_point = strlen (prompt); +} + +static char * +echo_area_after_read () +{ + char *return_value; + + if (info_aborted_echo_area) + { + info_aborted_echo_area = 0; + return_value = (char *)NULL; + } + else + { + if (input_line_beg == input_line_end) + return_value = strdup (""); + else + { + int line_len = input_line_end - input_line_beg; + return_value = (char *) xmalloc (1 + line_len); + strncpy (return_value, &input_line[input_line_beg], line_len); + return_value[line_len] = '\0'; + } + } + return (return_value); +} + +/* Read a line of text in the echo area. Return a malloc ()'ed string, + or NULL if the user aborted out of this read. WINDOW is the currently + active window, so that we can restore it when we need to. PROMPT, if + non-null, is a prompt to print before reading the line. */ +char * +info_read_in_echo_area (window, prompt) + WINDOW *window; + char *prompt; +{ + char *line; + + /* If the echo area is already active, remember the current state. */ + if (echo_area_is_active) + push_echo_area (); + + /* Initialize our local variables. */ + initialize_input_line (prompt); + + /* Initialize the echo area for the first (but maybe not the last) time. */ + echo_area_initialize_node (); + + /* Save away the original node of this window, and the window itself, + so echo area commands can temporarily use this window. */ + remember_calling_window (window); + + /* Let the rest of Info know that the echo area is active. */ + echo_area_is_active++; + active_window = the_echo_area; + + /* Read characters in the echo area. */ + info_read_and_dispatch (); + + echo_area_is_active--; + + /* Restore the original active window and show point in it. */ + active_window = calling_window; + restore_calling_window (); + display_cursor_at_point (active_window); + fflush (stdout); + + /* Get the value of the line. */ + line = echo_area_after_read (); + + /* If there is a previous loop waiting for us, restore it now. */ + if (echo_area_is_active) + pop_echo_area (); + + /* Return the results to the caller. */ + return (line); +} + +/* (re) Initialize the echo area node. */ +static void +echo_area_initialize_node () +{ + register int i; + + for (i = input_line_end; i < sizeof (input_line); i++) + input_line[i] = ' '; + + input_line[i - 1] = '\n'; + window_set_node_of_window (the_echo_area, &input_line_node); + input_line[input_line_end] = '\n'; +} + +/* Prepare to read characters in the echo area. This can initialize the + echo area node, but its primary purpose is to side effect the input + line buffer contents. */ +void +echo_area_prep_read () +{ + if (the_echo_area->node != &input_line_node) + echo_area_initialize_node (); + + the_echo_area->point = input_line_point; + input_line[input_line_end] = '\n'; + display_update_one_window (the_echo_area); + display_cursor_at_point (active_window); +} + + +/* **************************************************************** */ +/* */ +/* Echo Area Movement Commands */ +/* */ +/* **************************************************************** */ + +DECLARE_INFO_COMMAND (ea_forward, "Move forward a character") +{ + if (count < 0) + ea_backward (window, -count, key); + else + { + input_line_point += count; + if (input_line_point > input_line_end) + input_line_point = input_line_end; + } +} + +DECLARE_INFO_COMMAND (ea_backward, "Move backward a character") +{ + if (count < 0) + ea_forward (window, -count, key); + else + { + input_line_point -= count; + if (input_line_point < input_line_beg) + input_line_point = input_line_beg; + } +} + +DECLARE_INFO_COMMAND (ea_beg_of_line, "Move to the start of this line") +{ + input_line_point = input_line_beg; +} + +DECLARE_INFO_COMMAND (ea_end_of_line, "Move to the end of this line") +{ + input_line_point = input_line_end; +} + +#define alphabetic(c) (islower (c) || isupper (c) || isdigit (c)) + +/* Move forward a word in the input line. */ +DECLARE_INFO_COMMAND (ea_forward_word, "Move forward a word") +{ + int c; + + if (count < 0) + ea_backward_word (window, -count, key); + else + { + while (count--) + { + if (input_line_point == input_line_end) + return; + + /* If we are not in a word, move forward until we are in one. + Then, move forward until we hit a non-alphabetic character. */ + c = input_line[input_line_point]; + + if (!alphabetic (c)) + { + while (++input_line_point < input_line_end) + { + c = input_line[input_line_point]; + if (alphabetic (c)) + break; + } + } + + if (input_line_point == input_line_end) + return; + + while (++input_line_point < input_line_end) + { + c = input_line[input_line_point]; + if (!alphabetic (c)) + break; + } + } + } +} + +DECLARE_INFO_COMMAND (ea_backward_word, "Move backward a word") +{ + int c; + + if (count < 0) + ea_forward_word (window, -count, key); + else + { + while (count--) + { + if (input_line_point == input_line_beg) + return; + + /* Like ea_forward_word (), except that we look at the + characters just before point. */ + + c = input_line[input_line_point - 1]; + + if (!alphabetic (c)) + { + while ((--input_line_point) != input_line_beg) + { + c = input_line[input_line_point - 1]; + if (alphabetic (c)) + break; + } + } + + while (input_line_point != input_line_beg) + { + c = input_line[input_line_point - 1]; + if (!alphabetic (c)) + break; + else + --input_line_point; + } + } + } +} + +DECLARE_INFO_COMMAND (ea_delete, "Delete the character under the cursor") +{ + register int i; + + if (count < 0) + ea_rubout (window, -count, key); + else + { + if (input_line_point == input_line_end) + return; + + if (info_explicit_arg || count > 1) + { + int orig_point; + + orig_point = input_line_point; + ea_forward (window, count, key); + ea_kill_text (orig_point, input_line_point); + input_line_point = orig_point; + } + else + { + for (i = input_line_point; i < input_line_end; i++) + input_line[i] = input_line[i + 1]; + + input_line_end--; + } + } +} + +DECLARE_INFO_COMMAND (ea_rubout, "Delete the character behind the cursor") +{ + if (count < 0) + ea_delete (window, -count, key); + else + { + int start; + + if (input_line_point == input_line_beg) + return; + + start = input_line_point; + ea_backward (window, count, key); + + if (info_explicit_arg || count > 1) + ea_kill_text (start, input_line_point); + else + ea_delete (window, count, key); + } +} + +DECLARE_INFO_COMMAND (ea_abort, "Cancel or quit operation") +{ + /* If any text, just discard it, and restore the calling window's node. + If no text, quit. */ + if (input_line_end != input_line_beg) + { + terminal_ring_bell (); + input_line_end = input_line_point = input_line_beg; + if (calling_window->node != calling_window_node) + restore_calling_window (); + } + else + info_aborted_echo_area = 1; +} + +DECLARE_INFO_COMMAND (ea_newline, "Accept (or force completion of) this line") +{ + /* Stub does nothing. Simply here to see if it has been executed. */ +} + +DECLARE_INFO_COMMAND (ea_quoted_insert, "Insert next character verbatim") +{ + unsigned char character; + + character = info_get_another_input_char (); + ea_insert (window, count, character); +} + +DECLARE_INFO_COMMAND (ea_insert, "Insert this character") +{ + register int i; + + if ((input_line_end + 1) == EA_MAX_INPUT) + { + terminal_ring_bell (); + return; + } + + for (i = input_line_end + 1; i != input_line_point; i--) + input_line[i] = input_line[i - 1]; + + input_line[input_line_point] = key; + input_line_point++; + input_line_end++; +} + +DECLARE_INFO_COMMAND (ea_tab_insert, "Insert a TAB character") +{ + ea_insert (window, count, '\t'); +} + +/* Transpose the characters at point. If point is at the end of the line, + then transpose the characters before point. */ +DECLARE_INFO_COMMAND (ea_transpose_chars, "Transpose characters at point") +{ + /* Handle conditions that would make it impossible to transpose + characters. */ + if (!count || !input_line_point || (input_line_end - input_line_beg) < 2) + return; + + while (count) + { + int t; + if (input_line_point == input_line_end) + { + t = input_line[input_line_point - 1]; + + input_line[input_line_point - 1] = input_line[input_line_point - 2]; + input_line[input_line_point - 2] = t; + } + else + { + t = input_line[input_line_point]; + + input_line[input_line_point] = input_line[input_line_point - 1]; + input_line[input_line_point - 1] = t; + + if (count < 0 && input_line_point != input_line_beg) + input_line_point--; + else + input_line_point++; + } + + if (count < 0) + count++; + else + count--; + } +} + +/* **************************************************************** */ +/* */ +/* Echo Area Killing and Yanking */ +/* */ +/* **************************************************************** */ + +static char **kill_ring = (char **)NULL; +static int kill_ring_index = 0; /* Number of kills appearing in KILL_RING. */ +static int kill_ring_slots = 0; /* Number of slots allocated to KILL_RING. */ +static int kill_ring_loc = 0; /* Location of current yank pointer. */ + +/* The largest number of kills that we remember at one time. */ +static int max_retained_kills = 15; + +DECLARE_INFO_COMMAND (ea_yank, "Yank back the contents of the last kill") +{ + register int i; + register char *text; + + if (!kill_ring_index) + { + inform_in_echo_area ("Kill ring is empty"); + return; + } + + text = kill_ring[kill_ring_loc]; + + for (i = 0; text[i]; i++) + ea_insert (window, 1, text[i]); +} + +/* If the last command was yank, or yank_pop, and the text just before + point is identical to the current kill item, then delete that text + from the line, rotate the index down, and yank back some other text. */ +DECLARE_INFO_COMMAND (ea_yank_pop, "Yank back a previous kill") +{ + register int len; + + if (((ea_last_executed_command != ea_yank) && + (ea_last_executed_command != ea_yank_pop)) || + (kill_ring_index == 0)) + return; + + len = strlen (kill_ring[kill_ring_loc]); + + /* Delete the last yanked item from the line. */ + { + register int i, counter; + + counter = input_line_end - input_line_point; + + for (i = input_line_point - len; counter; i++, counter--) + input_line[i] = input_line[i + len]; + + input_line_end -= len; + input_line_point -= len; + } + + /* Get a previous kill, and yank that. */ + kill_ring_loc--; + if (kill_ring_loc < 0) + kill_ring_loc = kill_ring_index - 1; + + ea_yank (window, count, key); +} + +/* Delete the text from point to end of line. */ +DECLARE_INFO_COMMAND (ea_kill_line, "Kill to the end of the line") +{ + if (count < 0) + { + ea_kill_text (input_line_point, input_line_beg); + input_line_point = input_line_beg; + } + else + ea_kill_text (input_line_point, input_line_end); +} + +/* Delete the text from point to beg of line. */ +DECLARE_INFO_COMMAND (ea_backward_kill_line, + "Kill to the beginning of the line") +{ + if (count < 0) + ea_kill_text (input_line_point, input_line_end); + else + { + ea_kill_text (input_line_point, input_line_beg); + input_line_point = input_line_beg; + } +} + +/* Delete from point to the end of the current word. */ +DECLARE_INFO_COMMAND (ea_kill_word, "Kill the word following the cursor") +{ + int orig_point = input_line_point; + + if (count < 0) + ea_backward_kill_word (window, -count, key); + else + { + ea_forward_word (window, count, key); + + if (input_line_point != orig_point) + ea_kill_text (orig_point, input_line_point); + + input_line_point = orig_point; + } +} + +/* Delete from point to the start of the current word. */ +DECLARE_INFO_COMMAND (ea_backward_kill_word, + "Kill the word preceding the cursor") +{ + int orig_point = input_line_point; + + if (count < 0) + ea_kill_word (window, -count, key); + else + { + ea_backward_word (window, count, key); + + if (input_line_point != orig_point) + ea_kill_text (orig_point, input_line_point); + } +} + +/* The way to kill something. This appends or prepends to the last + kill, if the last command was a kill command. If FROM is less + than TO, then the killed text is appended to the most recent kill, + otherwise it is prepended. If the last command was not a kill command, + then a new slot is made for this kill. */ +static void +ea_kill_text (from, to) + int from, to; +{ + register int i, counter, distance; + int killing_backwards, slot; + char *killed_text; + + killing_backwards = (from > to); + + /* If killing backwards, reverse the values of FROM and TO. */ + if (killing_backwards) + { + int temp = from; + from = to; + to = temp; + } + + /* Remember the text that we are about to delete. */ + distance = to - from; + killed_text = (char *)xmalloc (1 + distance); + strncpy (killed_text, &input_line[from], distance); + killed_text[distance] = '\0'; + + /* Actually delete the text from the line. */ + counter = input_line_end - to; + + for (i = from; counter; i++, counter--) + input_line[i] = input_line[i + distance]; + + input_line_end -= distance; + + /* If the last command was a kill, append or prepend the killed text to + the last command's killed text. */ + if (echo_area_last_command_was_kill) + { + char *old, *new; + + slot = kill_ring_loc; + old = kill_ring[slot]; + new = (char *)xmalloc (1 + strlen (old) + strlen (killed_text)); + + if (killing_backwards) + { + /* Prepend TEXT to current kill. */ + strcpy (new, killed_text); + strcat (new, old); + } + else + { + /* Append TEXT to current kill. */ + strcpy (new, old); + strcat (new, killed_text); + } + + free (old); + free (killed_text); + kill_ring[slot] = new; + } + else + { + /* Try to store the kill in a new slot, unless that would cause there + to be too many remembered kills. */ + slot = kill_ring_index; + + if (slot == max_retained_kills) + slot = 0; + + if (slot + 1 > kill_ring_slots) + kill_ring = (char **) xrealloc + (kill_ring, + (kill_ring_slots += max_retained_kills) * sizeof (char *)); + + if (slot != kill_ring_index) + free (kill_ring[slot]); + else + kill_ring_index++; + + kill_ring[slot] = killed_text; + + kill_ring_loc = slot; + } + + /* Notice that the last command was a kill. */ + echo_area_last_command_was_kill++; +} + +/* **************************************************************** */ +/* */ +/* Echo Area Completion */ +/* */ +/* **************************************************************** */ + +/* Pointer to an array of REFERENCE to complete over. */ +static REFERENCE **echo_area_completion_items = (REFERENCE **)NULL; + +/* Sorted array of REFERENCE * which is the possible completions found in + the variable echo_area_completion_items. If there is only one element, + it is the only possible completion. */ +static REFERENCE **completions_found = (REFERENCE **)NULL; +static int completions_found_index = 0; +static int completions_found_slots = 0; + +/* The lowest common denominator found while completing. */ +static REFERENCE *LCD_completion; + +/* Internal functions used by the user calls. */ +static void build_completions (), completions_must_be_rebuilt (); + +/* Variable which holds the output of completions. */ +static NODE *possible_completions_output_node = (NODE *)NULL; + +static char *compwin_name = "*Completions*"; + +/* Return non-zero if WINDOW is a window used for completions output. */ +static int +completions_window_p (window) + WINDOW *window; +{ + int result = 0; + + if (internal_info_node_p (window->node) && + (strcmp (window->node->nodename, compwin_name) == 0)) + result = 1; + + return (result); +} + +/* Workhorse for completion readers. If FORCE is non-zero, the user cannot + exit unless the line read completes, or is empty. */ +char * +info_read_completing_internal (window, prompt, completions, force) + WINDOW *window; + char *prompt; + REFERENCE **completions; + int force; +{ + char *line; + + /* If the echo area is already active, remember the current state. */ + if (echo_area_is_active) + push_echo_area (); + + echo_area_must_complete_p = force; + + /* Initialize our local variables. */ + initialize_input_line (prompt); + + /* Initialize the echo area for the first (but maybe not the last) time. */ + echo_area_initialize_node (); + + /* Save away the original node of this window, and the window itself, + so echo area commands can temporarily use this window. */ + remember_calling_window (window); + + /* Save away the list of items to complete over. */ + echo_area_completion_items = completions; + completions_must_be_rebuilt (); + + active_window = the_echo_area; + echo_area_is_active++; + + /* Read characters in the echo area. */ + while (1) + { + info_read_and_dispatch (); + + line = echo_area_after_read (); + + /* Force the completion to take place if the user hasn't accepted + a default or aborted, and if FORCE is active. */ + if (force && line && *line && completions) + { + register int i; + + build_completions (); + + /* If there is only one completion, then make the line be that + completion. */ + if (completions_found_index == 1) + { + free (line); + line = strdup (completions_found[0]->label); + break; + } + + /* If one of the completions matches exactly, then that is okay, so + return the current line. */ + for (i = 0; i < completions_found_index; i++) + if (strcasecmp (completions_found[i]->label, line) == 0) + { + free (line); + line = strdup (completions_found[i]->label); + break; + } + + /* If no match, go back and try again. */ + if (i == completions_found_index) + { + inform_in_echo_area ("Not complete"); + continue; + } + } + break; + } + echo_area_is_active--; + + /* Restore the original active window and show point in it. */ + active_window = calling_window; + restore_calling_window (); + display_cursor_at_point (active_window); + fflush (stdout); + + echo_area_completion_items = (REFERENCE **)NULL; + completions_must_be_rebuilt (); + + /* If there is a previous loop waiting for us, restore it now. */ + if (echo_area_is_active) + pop_echo_area (); + + return (line); +} + +/* Read a line in the echo area with completion over COMPLETIONS. */ +char * +info_read_completing_in_echo_area (window, prompt, completions) + WINDOW *window; + char *prompt; + REFERENCE **completions; +{ + return (info_read_completing_internal (window, prompt, completions, 1)); +} + +/* Read a line in the echo area allowing completion over COMPLETIONS, but + not requiring it. */ +char * +info_read_maybe_completing (window, prompt, completions) + WINDOW *window; + char *prompt; + REFERENCE **completions; +{ + return (info_read_completing_internal (window, prompt, completions, 0)); +} + +DECLARE_INFO_COMMAND (ea_possible_completions, "List possible completions") +{ + if (!echo_area_completion_items) + { + ea_insert (window, count, key); + return; + } + + build_completions (); + + if (!completions_found_index) + { + terminal_ring_bell (); + inform_in_echo_area ("No completions"); + } + else if ((completions_found_index == 1) && (key != '?')) + { + inform_in_echo_area ("Sole completion"); + } + else + { + register int i, l; + int limit, count, max_label = 0; + + initialize_message_buffer (); + printf_to_message_buffer + ("There %s %d ", completions_found_index == 1 ? "is" : "are", + completions_found_index); + printf_to_message_buffer + ("completion%s:\n", completions_found_index == 1 ? "" : "s"); + + /* Find the maximum length of a label. */ + for (i = 0; i < completions_found_index; i++) + { + int len = strlen (completions_found[i]->label); + if (len > max_label) + max_label = len; + } + + max_label += 4; + + /* Find out how many columns we should print in. */ + limit = calling_window->width / max_label; + if (limit != 1 && (limit * max_label == calling_window->width)) + limit--; + + /* Avoid a possible floating exception. If max_label > width then + the limit will be 0 and a divide-by-zero fault will result. */ + if (limit == 0) + limit = 1; + + /* How many iterations of the printing loop? */ + count = (completions_found_index + (limit - 1)) / limit; + + /* Watch out for special case. If the number of completions is less + than LIMIT, then just do the inner printing loop. */ + if (completions_found_index < limit) + count = 1; + + /* Print the sorted items, up-and-down alphabetically. */ + for (i = 0; i < count; i++) + { + register int j; + + for (j = 0, l = i; j < limit; j++) + { + if (l >= completions_found_index) + break; + else + { + char *label; + int printed_length, k; + + label = completions_found[l]->label; + printed_length = strlen (label); + printf_to_message_buffer ("%s", label); + + if (j + 1 < limit) + { + for (k = 0; k < max_label - printed_length; k++) + printf_to_message_buffer (" "); + } + } + l += count; + } + printf_to_message_buffer ("\n"); + } + + /* Make a new node to hold onto possible completions. Don't destroy + dangling pointers. */ + { + NODE *temp; + + temp = message_buffer_to_node (); + add_gcable_pointer (temp->contents); + name_internal_node (temp, compwin_name); + possible_completions_output_node = temp; + } + + /* Find a suitable window for displaying the completions output. + First choice is an existing window showing completions output. + If there is only one window, and it is large, make another + (smaller) window, and use that one. Otherwise, use the caller's + window. */ + { + WINDOW *compwin; + + compwin = get_internal_info_window (compwin_name); + + if (!compwin) + { + /* If we can split the window to display most of the completion + items, then do so. */ + if (calling_window->height > (count * 2)) + { + int start, end, pagetop; + + active_window = calling_window; + + /* Perhaps we can scroll this window on redisplay. */ + start = calling_window->first_row; + pagetop = calling_window->pagetop; + + compwin = + window_make_window (possible_completions_output_node); + active_window = the_echo_area; + window_change_window_height + (compwin, -(compwin->height - (count + 2))); + + window_adjust_pagetop (calling_window); + remember_calling_window (calling_window); + +#if defined (SPLIT_BEFORE_ACTIVE) + /* If the pagetop hasn't changed, scrolling the calling + window is a reasonable thing to do. */ + if (pagetop == calling_window->pagetop) + { + end = start + calling_window->height; + display_scroll_display + (start, end, calling_window->prev->height + 1); + } +#else /* !SPLIT_BEFORE_ACTIVE */ + /* If the pagetop has changed, set the new pagetop here. */ + if (pagetop != calling_window->pagetop) + { + int newtop = calling_window->pagetop; + calling_window->pagetop = pagetop; + set_window_pagetop (calling_window, newtop); + } +#endif /* !SPLIT_BEFORE_ACTIVE */ + + echo_area_completions_window = compwin; + remember_window_and_node (compwin, compwin->node); + } + else + compwin = calling_window; + } + + if (compwin->node != possible_completions_output_node) + { + window_set_node_of_window + (compwin, possible_completions_output_node); + remember_window_and_node (compwin, compwin->node); + } + + display_update_display (windows); + } + } +} + +DECLARE_INFO_COMMAND (ea_complete, "Insert completion") +{ + if (!echo_area_completion_items) + { + ea_insert (window, count, key); + return; + } + + /* If KEY is SPC, and we are not forcing completion to take place, simply + insert the key. */ + if (!echo_area_must_complete_p && key == SPC) + { + ea_insert (window, count, key); + return; + } + + if (ea_last_executed_command == ea_complete) + { + /* If the keypress is a SPC character, and we have already tried + completing once, and there are several completions, then check + the batch of completions to see if any continue with a space. + If there are some, insert the space character and continue. */ + if (key == SPC && completions_found_index > 1) + { + register int i, offset; + + offset = input_line_end - input_line_beg; + + for (i = 0; i < completions_found_index; i++) + if (completions_found[i]->label[offset] == ' ') + break; + + if (completions_found[i]) + ea_insert (window, 1, ' '); + else + { + ea_possible_completions (window, count, key); + return; + } + } + else + { + ea_possible_completions (window, count, key); + return; + } + } + + input_line_point = input_line_end; + build_completions (); + + if (!completions_found_index) + terminal_ring_bell (); + else if (LCD_completion->label[0] == '\0') + ea_possible_completions (window, count, key); + else + { + register int i; + input_line_point = input_line_end = input_line_beg; + for (i = 0; LCD_completion->label[i]; i++) + ea_insert (window, 1, LCD_completion->label[i]); + } +} + +/* Utility REFERENCE used to store possible LCD. */ +static REFERENCE LCD_reference = { (char *)NULL, (char *)NULL, (char *)NULL }; + +static void remove_completion_duplicates (); + +/* Variables which remember the state of the most recent call + to build_completions (). */ +static char *last_completion_request = (char *)NULL; +static REFERENCE **last_completion_items = (REFERENCE **)NULL; + +/* How to tell the completion builder to reset internal state. */ +static void +completions_must_be_rebuilt () +{ + maybe_free (last_completion_request); + last_completion_request = (char *)NULL; + last_completion_items = (REFERENCE **)NULL; +} + +/* Build a list of possible completions from echo_area_completion_items, + and the contents of input_line. */ +static void +build_completions () +{ + register int i, len; + register REFERENCE *entry; + char *request; + int informed_of_lengthy_job = 0; + + /* If there are no items to complete over, exit immediately. */ + if (!echo_area_completion_items) + { + completions_found_index = 0; + LCD_completion = (REFERENCE *)NULL; + return; + } + + /* Check to see if this call to build completions is the same as the last + call to build completions. */ + len = input_line_end - input_line_beg; + request = (char *)xmalloc (1 + len); + strncpy (request, &input_line[input_line_beg], len); + request[len] = '\0'; + + if (last_completion_request && last_completion_items && + last_completion_items == echo_area_completion_items && + (strcmp (last_completion_request, request) == 0)) + { + free (request); + return; + } + + maybe_free (last_completion_request); + last_completion_request = request; + last_completion_items = echo_area_completion_items; + + /* Always start at the beginning of the list. */ + completions_found_index = 0; + LCD_completion = (REFERENCE *)NULL; + + for (i = 0; entry = echo_area_completion_items[i]; i++) + { + if (strncasecmp (request, entry->label, len) == 0) + add_pointer_to_array (entry, completions_found_index, + completions_found, completions_found_slots, + 20, REFERENCE *); + + if (!informed_of_lengthy_job && completions_found_index > 100) + { + informed_of_lengthy_job = 1; + window_message_in_echo_area ("Building completions..."); + } + } + + if (!completions_found_index) + return; + + /* Sort and prune duplicate entries from the completions array. */ + remove_completion_duplicates (); + + /* If there is only one completion, just return that. */ + if (completions_found_index == 1) + { + LCD_completion = completions_found[0]; + return; + } + + /* Find the least common denominator. */ + { + long shortest = 100000; + + for (i = 1; i < completions_found_index; i++) + { + register int j; + int c1, c2; + + for (j = 0; + (c1 = info_tolower (completions_found[i - 1]->label[j])) && + (c2 = info_tolower (completions_found[i]->label[j])); + j++) + if (c1 != c2) + break; + + if (shortest > j) + shortest = j; + } + + maybe_free (LCD_reference.label); + LCD_reference.label = (char *)xmalloc (1 + shortest); + strncpy (LCD_reference.label, completions_found[0]->label, shortest); + LCD_reference.label[shortest] = '\0'; + LCD_completion = &LCD_reference; + } + + if (informed_of_lengthy_job) + echo_area_initialize_node (); +} + +/* Function called by qsort. */ +static int +compare_references (entry1, entry2) + REFERENCE **entry1, **entry2; +{ + return (strcasecmp ((*entry1)->label, (*entry2)->label)); +} + +/* Prune duplicate entries from COMPLETIONS_FOUND. */ +static void +remove_completion_duplicates () +{ + register int i, j; + REFERENCE **temp; + int newlen; + + if (!completions_found_index) + return; + + /* Sort the items. */ + qsort (completions_found, completions_found_index, sizeof (REFERENCE *), + compare_references); + + for (i = 0, newlen = 1; i < completions_found_index - 1; i++) + { + if (strcmp (completions_found[i]->label, + completions_found[i + 1]->label) == 0) + completions_found[i] = (REFERENCE *)NULL; + else + newlen++; + } + + /* We have marked all the dead slots. It is faster to copy the live slots + twice than to prune the dead slots one by one. */ + temp = (REFERENCE **)xmalloc ((1 + newlen) * sizeof (REFERENCE *)); + for (i = 0, j = 0; i < completions_found_index; i++) + if (completions_found[i]) + temp[j++] = completions_found[i]; + + for (i = 0; i < newlen; i++) + completions_found[i] = temp[i]; + + completions_found[i] = (REFERENCE *)NULL; + completions_found_index = newlen; + free (temp); +} + +/* Scroll the "other" window. If there is a window showing completions, scroll + that one, otherwise scroll the window which was active on entering the read + function. */ +DECLARE_INFO_COMMAND (ea_scroll_completions_window, "Scroll the completions window") +{ + WINDOW *compwin; + int old_pagetop; + + compwin = get_internal_info_window (compwin_name); + + if (!compwin) + compwin = calling_window; + + old_pagetop = compwin->pagetop; + + /* Let info_scroll_forward () do the work, and print any messages that + need to be displayed. */ + info_scroll_forward (compwin, count, key); +} + +/* Function which gets called when an Info window is deleted while the + echo area is active. WINDOW is the window which has just been deleted. */ +void +echo_area_inform_of_deleted_window (window) + WINDOW *window; +{ + /* If this is the calling_window, forget what we remembered about it. */ + if (window == calling_window) + { + if (active_window != the_echo_area) + remember_calling_window (active_window); + else + remember_calling_window (windows); + } + + /* If this window was the echo_area_completions_window, then notice that + the window has been deleted. */ + if (window == echo_area_completions_window) + echo_area_completions_window = (WINDOW *)NULL; +} + +/* **************************************************************** */ +/* */ +/* Pushing and Popping the Echo Area */ +/* */ +/* **************************************************************** */ + +/* Push and Pop the echo area. */ +typedef struct { + char *line; + char *prompt; + REFERENCE **comp_items; + int point, beg, end; + int must_complete; + NODE node; + WINDOW *compwin; +} PUSHED_EA; + +static PUSHED_EA **pushed_echo_areas = (PUSHED_EA **)NULL; +static int pushed_echo_areas_index = 0; +static int pushed_echo_areas_slots = 0; + +/* Pushing the echo_area has a side effect of zeroing the completion_items. */ +static void +push_echo_area () +{ + PUSHED_EA *pushed; + + pushed = (PUSHED_EA *)xmalloc (sizeof (PUSHED_EA)); + pushed->line = strdup (input_line); + pushed->prompt = input_line_prompt; + pushed->point = input_line_point; + pushed->beg = input_line_beg; + pushed->end = input_line_end; + pushed->node = input_line_node; + pushed->comp_items = echo_area_completion_items; + pushed->must_complete = echo_area_must_complete_p; + pushed->compwin = echo_area_completions_window; + + add_pointer_to_array (pushed, pushed_echo_areas_index, pushed_echo_areas, + pushed_echo_areas_slots, 4, PUSHED_EA *); + + echo_area_completion_items = (REFERENCE **)NULL; +} + +static void +pop_echo_area () +{ + PUSHED_EA *popped; + + popped = pushed_echo_areas[--pushed_echo_areas_index]; + + strcpy (input_line, popped->line); + free (popped->line); + input_line_prompt = popped->prompt; + input_line_point = popped->point; + input_line_beg = popped->beg; + input_line_end = popped->end; + input_line_node = popped->node; + echo_area_completion_items = popped->comp_items; + echo_area_must_complete_p = popped->must_complete; + echo_area_completions_window = popped->compwin; + completions_must_be_rebuilt (); + + /* If the completion window no longer exists, forget about it. */ + if (echo_area_completions_window) + { + register WINDOW *win; + + for (win = windows; win; win = win->next) + if (echo_area_completions_window == win) + break; + + /* If the window wasn't found, then it has already been deleted. */ + if (!win) + echo_area_completions_window = (WINDOW *)NULL; + } + + free (popped); +} + +static int +echo_area_stack_depth () +{ + return (pushed_echo_areas_index); +} + +/* Returns non-zero if any of the prior stacked calls to read in the echo + area produced a completions window. */ +static int +echo_area_stack_contains_completions_p () +{ + register int i; + + for (i = 0; i < pushed_echo_areas_index; i++) + if (pushed_echo_areas[i]->compwin) + return (1); + + return (0); +} + +/* **************************************************************** */ +/* */ +/* Error Messages While Reading in Echo Area */ +/* */ +/* **************************************************************** */ + +#if defined (HAVE_SYS_TIME_H) +# include <sys/time.h> +# define HAVE_STRUCT_TIMEVAL +#endif /* HAVE_SYS_TIME_H */ + +static void +pause_or_input () +{ +#if defined (FD_SET) + struct timeval timer; + fd_set readfds; + int ready; + + FD_ZERO (&readfds); + FD_SET (fileno (stdin), &readfds); + timer.tv_sec = 2; + timer.tv_usec = 750; + ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer); +#endif /* FD_SET */ +} + +/* Print MESSAGE right after the end of the current line, and wait + for input or 2.75 seconds, whichever comes first. Then flush the + informational message that was printed. */ +void +inform_in_echo_area (message) + char *message; +{ + register int i; + char *text; + + text = strdup (message); + for (i = 0; text[i] && text[i] != '\n'; i++); + text[i] = '\0'; + + echo_area_initialize_node (); + sprintf (&input_line[input_line_end], "%s[%s]\n", + echo_area_is_active ? " ": "", text); + free (text); + the_echo_area->point = input_line_point; + display_update_one_window (the_echo_area); + display_cursor_at_point (active_window); + fflush (stdout); + pause_or_input (); + echo_area_initialize_node (); +}
new file mode 100644 --- /dev/null +++ b/info/echo_area.h @@ -0,0 +1,63 @@ +/* echo_area.h -- Functions used in reading information from the echo area. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_ECHO_AREA_H_) +#define _ECHO_AREA_H_ + +#define EA_MAX_INPUT 256 + +extern int echo_area_is_active, info_aborted_echo_area; + +/* Non-zero means that the last command executed while reading input + killed some text. */ +extern int echo_area_last_command_was_kill; + +extern void inform_in_echo_area (), echo_area_inform_of_deleted_window (); +extern void echo_area_prep_read (); +extern VFunction *ea_last_executed_command; + +/* Read a line of text in the echo area. Return a malloc ()'ed string, + or NULL if the user aborted out of this read. WINDOW is the currently + active window, so that we can restore it when we need to. PROMPT, if + non-null, is a prompt to print before reading the line. */ +extern char *info_read_in_echo_area (); + +/* Read a line in the echo area with completion over COMPLETIONS. + Takes arguments of WINDOW, PROMPT, and COMPLETIONS, a REFERENCE **. */ +char *info_read_completing_in_echo_area (); + +/* Read a line in the echo area allowing completion over COMPLETIONS, but + not requiring it. Takes arguments of WINDOW, PROMPT, and COMPLETIONS, + a REFERENCE **. */ +extern char *info_read_maybe_completing (); + +extern void ea_insert (), ea_quoted_insert (); +extern void ea_beg_of_line (), ea_backward (), ea_delete (), ea_end_of_line (); +extern void ea_forward (), ea_abort (), ea_rubout (), ea_complete (); +extern void ea_newline (), ea_kill_line (), ea_transpose_chars (); +extern void ea_yank (), ea_tab_insert (), ea_possible_completions (); +extern void ea_backward_word (), ea_kill_word (), ea_forward_word (); +extern void ea_yank_pop (), ea_backward_kill_word (); +extern void ea_scroll_completions_window (); + +#endif /* _ECHO_AREA_H_ */
new file mode 100644 --- /dev/null +++ b/info/filesys.c @@ -0,0 +1,617 @@ +/* filesys.c -- File system specific functions for hacking this system. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> +#if defined (HAVE_SYS_FILE_H) +#include <sys/file.h> +#endif /* HAVE_SYS_FILE_H */ +#include <sys/errno.h> +#include "general.h" +#include "tilde.h" +#include "filesys.h" + +#if !defined (O_RDONLY) +#if defined (HAVE_SYS_FCNTL_H) +#include <sys/fcntl.h> +#else /* !HAVE_SYS_FCNTL_H */ +#include <fcntl.h> +#endif /* !HAVE_SYS_FCNTL_H */ +#endif /* !O_RDONLY */ + +#if !defined (errno) +extern int errno; +#endif /* !errno */ + +/* Found in info-utils.c. */ +extern char *filename_non_directory (); + +#if !defined (BUILDING_LIBRARY) +/* Found in session.c */ +extern int info_windows_initialized_p; + +/* Found in window.c. */ +extern void message_in_echo_area (), unmessage_in_echo_area (); +#endif /* !BUILDING_LIBRARY */ + +/* Local to this file. */ +static char *info_file_in_path (), *lookup_info_filename (); +static void remember_info_filename (), maybe_initialize_infopath (); + +#if !defined (NULL) +# define NULL 0x0 +#endif /* !NULL */ + +typedef struct { + char *suffix; + char *decompressor; +} COMPRESSION_ALIST; + +static char *info_suffixes[] = { + "", + ".info", + "-info", + (char *)NULL +}; + +static COMPRESSION_ALIST compress_suffixes[] = { + { ".Z", "uncompress" }, + { ".Y", "unyabba" }, + { ".z", "gunzip" }, + { ".gz", "gunzip" }, + { (char *)NULL, (char *)NULL } +}; + +/* The path on which we look for info files. You can initialize this + from the environment variable INFOPATH if there is one, or you can + call info_add_path () to add paths to the beginning or end of it. + You can call zap_infopath () to make the path go away. */ +char *infopath = (char *)NULL; +static int infopath_size = 0; + +/* Expand the filename in PARTIAL to make a real name for this operating + system. This looks in INFO_PATHS in order to find the correct file. + If it can't find the file, it returns NULL. */ +static char *local_temp_filename = (char *)NULL; +static int local_temp_filename_size = 0; + +char * +info_find_fullpath (partial) + char *partial; +{ + int initial_character; + char *temp; + + filesys_error_number = 0; + + maybe_initialize_infopath (); + + if (partial && (initial_character = *partial)) + { + char *expansion; + + expansion = lookup_info_filename (partial); + + if (expansion) + return (expansion); + + /* If we have the full path to this file, we still may have to add + various extensions to it. I guess we have to stat this file + after all. */ + if (initial_character == '/') + temp = info_file_in_path (partial + 1, "/"); + else if (initial_character == '~') + { + expansion = tilde_expand_word (partial); + if (*expansion == '/') + { + temp = info_file_in_path (expansion + 1, "/"); + free (expansion); + } + else + temp = expansion; + } + else if (initial_character == '.' && + (partial[1] == '/' || (partial[1] == '.' && partial[2] == '/'))) + { + if (local_temp_filename_size < 1024) + local_temp_filename = (char *)xrealloc + (local_temp_filename, (local_temp_filename_size = 1024)); +#if defined (HAVE_GETCWD) + if (!getcwd (local_temp_filename, local_temp_filename_size)) +#else /* !HAVE_GETCWD */ + if (!getwd (local_temp_filename)) +#endif /* !HAVE_GETCWD */ + { + filesys_error_number = errno; + return (partial); + } + + strcat (local_temp_filename, "/"); + strcat (local_temp_filename, partial); + return (local_temp_filename); + } + else + temp = info_file_in_path (partial, infopath); + + if (temp) + { + remember_info_filename (partial, temp); + if (strlen (temp) > local_temp_filename_size) + local_temp_filename = (char *) xrealloc + (local_temp_filename, + (local_temp_filename_size = (50 + strlen (temp)))); + strcpy (local_temp_filename, temp); + free (temp); + return (local_temp_filename); + } + } + return (partial); +} + +/* Scan the list of directories in PATH looking for FILENAME. If we find + one that is a regular file, return it as a new string. Otherwise, return + a NULL pointer. */ +static char * +info_file_in_path (filename, path) + char *filename, *path; +{ + struct stat finfo; + char *temp_dirname; + int statable, dirname_index; + + dirname_index = 0; + + while (temp_dirname = extract_colon_unit (path, &dirname_index)) + { + register int i, pre_suffix_length; + char *temp; + + /* Expand a leading tilde if one is present. */ + if (*temp_dirname == '~') + { + char *expanded_dirname; + + expanded_dirname = tilde_expand_word (temp_dirname); + free (temp_dirname); + temp_dirname = expanded_dirname; + } + + temp = (char *)xmalloc (30 + strlen (temp_dirname) + strlen (filename)); + strcpy (temp, temp_dirname); + if (temp[(strlen (temp)) - 1] != '/') + strcat (temp, "/"); + strcat (temp, filename); + + pre_suffix_length = strlen (temp); + + free (temp_dirname); + + for (i = 0; info_suffixes[i]; i++) + { + strcpy (temp + pre_suffix_length, info_suffixes[i]); + + statable = (stat (temp, &finfo) == 0); + + /* If we have found a regular file, then use that. Else, if we + have found a directory, look in that directory for this file. */ + if (statable) + { + if (S_ISREG (finfo.st_mode)) + { + return (temp); + } + else if (S_ISDIR (finfo.st_mode)) + { + char *newpath, *filename_only, *newtemp; + + newpath = strdup (temp); + filename_only = filename_non_directory (filename); + newtemp = info_file_in_path (filename_only, newpath); + + free (newpath); + if (newtemp) + { + free (temp); + return (newtemp); + } + } + } + else + { + /* Add various compression suffixes to the name to see if + the file is present in compressed format. */ + register int j, pre_compress_suffix_length; + + pre_compress_suffix_length = strlen (temp); + + for (j = 0; compress_suffixes[j].suffix; j++) + { + strcpy (temp + pre_compress_suffix_length, + compress_suffixes[j].suffix); + + statable = (stat (temp, &finfo) == 0); + if (statable && (S_ISREG (finfo.st_mode))) + return (temp); + } + } + } + free (temp); + } + return ((char *)NULL); +} + +/* Given a string containing units of information separated by colons, + return the next one pointed to by IDX, or NULL if there are no more. + Advance IDX to the character after the colon. */ +char * +extract_colon_unit (string, idx) + char *string; + int *idx; +{ + register int i, start; + + i = start = *idx; + if ((i >= strlen (string)) || !string) + return ((char *) NULL); + + while (string[i] && string[i] != ':') + i++; + if (i == start) + { + return ((char *) NULL); + } + else + { + char *value; + + value = (char *) xmalloc (1 + (i - start)); + strncpy (value, &string[start], (i - start)); + value[i - start] = '\0'; + if (string[i]) + ++i; + *idx = i; + return (value); + } +} + +/* A structure which associates a filename with its expansion. */ +typedef struct { + char *filename; + char *expansion; +} FILENAME_LIST; + +/* An array of remembered arguments and results. */ +static FILENAME_LIST **names_and_files = (FILENAME_LIST **)NULL; +static int names_and_files_index = 0; +static int names_and_files_slots = 0; + +/* Find the result for having already called info_find_fullpath () with + FILENAME. */ +static char * +lookup_info_filename (filename) + char *filename; +{ + if (filename && names_and_files) + { + register int i; + for (i = 0; names_and_files[i]; i++) + { + if (strcmp (names_and_files[i]->filename, filename) == 0) + return (names_and_files[i]->expansion); + } + } + return (char *)NULL;; +} + +/* Add a filename and its expansion to our list. */ +static void +remember_info_filename (filename, expansion) + char *filename, *expansion; +{ + FILENAME_LIST *new; + + if (names_and_files_index + 2 > names_and_files_slots) + { + int alloc_size; + names_and_files_slots += 10; + + alloc_size = names_and_files_slots * sizeof (FILENAME_LIST *); + + names_and_files = + (FILENAME_LIST **) xrealloc (names_and_files, alloc_size); + } + + new = (FILENAME_LIST *)xmalloc (sizeof (FILENAME_LIST)); + new->filename = strdup (filename); + new->expansion = expansion ? strdup (expansion) : (char *)NULL; + + names_and_files[names_and_files_index++] = new; + names_and_files[names_and_files_index] = (FILENAME_LIST *)NULL; +} + +static void +maybe_initialize_infopath () +{ + if (!infopath_size) + { + infopath = (char *) + xmalloc (infopath_size = (1 + strlen (DEFAULT_INFOPATH))); + + strcpy (infopath, DEFAULT_INFOPATH); + } +} + +/* Add PATH to the list of paths found in INFOPATH. 2nd argument says + whether to put PATH at the front or end of INFOPATH. */ +void +info_add_path (path, where) + char *path; + int where; +{ + int len; + + if (!infopath) + { + infopath = (char *)xmalloc (infopath_size = 200 + strlen (path)); + infopath[0] = '\0'; + } + + len = strlen (path) + strlen (infopath); + + if (len + 2 >= infopath_size) + infopath = (char *)xrealloc (infopath, (infopath_size += (2 * len) + 2)); + + if (!*infopath) + strcpy (infopath, path); + else if (where == INFOPATH_APPEND) + { + strcat (infopath, ":"); + strcat (infopath, path); + } + else if (where == INFOPATH_PREPEND) + { + char *temp = strdup (infopath); + strcpy (infopath, path); + strcat (infopath, ":"); + strcat (infopath, temp); + free (temp); + } +} + +/* Make INFOPATH have absolutely nothing in it. */ +void +zap_infopath () +{ + if (infopath) + free (infopath); + + infopath = (char *)NULL; + infopath_size = 0; +} + +/* Read the contents of PATHNAME, returning a buffer with the contents of + that file in it, and returning the size of that buffer in FILESIZE. + FINFO is a stat struct which has already been filled in by the caller. + If the file cannot be read, return a NULL pointer. */ +char * +filesys_read_info_file (pathname, filesize, finfo) + char *pathname; + long *filesize; + struct stat *finfo; +{ + long st_size; + + *filesize = filesys_error_number = 0; + + if (compressed_filename_p (pathname)) + return (filesys_read_compressed (pathname, filesize, finfo)); + else + { + int descriptor; + char *contents; + + descriptor = open (pathname, O_RDONLY, 0666); + + /* If the file couldn't be opened, give up. */ + if (descriptor < 0) + { + filesys_error_number = errno; + return ((char *)NULL); + } + + /* Try to read the contents of this file. */ + st_size = (long) finfo->st_size; + contents = (char *)xmalloc (1 + st_size); + if ((read (descriptor, contents, st_size)) != st_size) + { + filesys_error_number = errno; + close (descriptor); + free (contents); + return ((char *)NULL); + } + + close (descriptor); + + *filesize = st_size; + return (contents); + } +} + +/* Typically, pipe buffers are 4k. */ +#define BASIC_PIPE_BUFFER (4 * 1024) + +/* We use some large multiple of that. */ +#define FILESYS_PIPE_BUFFER_SIZE (16 * BASIC_PIPE_BUFFER) + +char * +filesys_read_compressed (pathname, filesize, finfo) + char *pathname; + long *filesize; + struct stat *finfo; +{ + FILE *stream; + char *command, *decompressor; + char *contents = (char *)NULL; + + *filesize = filesys_error_number = 0; + + decompressor = filesys_decompressor_for_file (pathname); + + if (!decompressor) + return ((char *)NULL); + + command = (char *)xmalloc (10 + strlen (pathname) + strlen (decompressor)); + sprintf (command, "%s < %s", decompressor, pathname); + +#if !defined (BUILDING_LIBRARY) + if (info_windows_initialized_p) + { + char *temp; + + temp = (char *)xmalloc (5 + strlen (command)); + sprintf (temp, "%s...", command); + message_in_echo_area ("%s", temp); + free (temp); + } +#endif /* !BUILDING_LIBRARY */ + + stream = popen (command, "r"); + free (command); + + /* Read chunks from this file until there are none left to read. */ + if (stream) + { + int offset, size; + char *chunk; + + offset = size = 0; + chunk = (char *)xmalloc (FILESYS_PIPE_BUFFER_SIZE); + + while (1) + { + int bytes_read; + + bytes_read = fread (chunk, 1, FILESYS_PIPE_BUFFER_SIZE, stream); + + if (bytes_read + offset >= size) + contents = (char *)xrealloc + (contents, size += (2 * FILESYS_PIPE_BUFFER_SIZE)); + + memcpy (contents + offset, chunk, bytes_read); + offset += bytes_read; + if (bytes_read != FILESYS_PIPE_BUFFER_SIZE) + break; + } + + free (chunk); + pclose (stream); + contents = (char *)xrealloc (contents, offset + 1); + *filesize = offset; + } + else + { + filesys_error_number = errno; + } + +#if !defined (BUILDING_LIBARARY) + if (info_windows_initialized_p) + unmessage_in_echo_area (); +#endif /* !BUILDING_LIBRARY */ + return (contents); +} + +/* Return non-zero if FILENAME belongs to a compressed file. */ +int +compressed_filename_p (filename) + char *filename; +{ + char *decompressor; + + /* Find the final extension of this filename, and see if it matches one + of our known ones. */ + decompressor = filesys_decompressor_for_file (filename); + + if (decompressor) + return (1); + else + return (0); +} + +/* Return the command string that would be used to decompress FILENAME. */ +char * +filesys_decompressor_for_file (filename) + char *filename; +{ + register int i; + char *extension = (char *)NULL; + + /* Find the final extension of FILENAME, and see if it appears in our + list of known compression extensions. */ + for (i = strlen (filename) - 1; i > 0; i--) + if (filename[i] == '.') + { + extension = filename + i; + break; + } + + if (!extension) + return ((char *)NULL); + + for (i = 0; compress_suffixes[i].suffix; i++) + if (strcmp (extension, compress_suffixes[i].suffix) == 0) + return (compress_suffixes[i].decompressor); + + return ((char *)NULL); +} + +/* The number of the most recent file system error. */ +int filesys_error_number = 0; + +/* A function which returns a pointer to a static buffer containing + an error message for FILENAME and ERROR_NUM. */ +static char *errmsg_buf = (char *)NULL; +static int errmsg_buf_size = 0; + +char * +filesys_error_string (filename, error_num) + char *filename; + int error_num; +{ + int len; + char *result; + + if (error_num == 0) + return ((char *)NULL); + + result = strerror (error_num); + + len = 4 + strlen (filename) + strlen (result); + if (len >= errmsg_buf_size) + errmsg_buf = (char *)xrealloc (errmsg_buf, (errmsg_buf_size = 2 + len)); + + sprintf (errmsg_buf, "%s: %s", filename, result); + return (errmsg_buf); +} +
new file mode 100644 --- /dev/null +++ b/info/filesys.h @@ -0,0 +1,84 @@ +/* filesys.h -- External declarations of functions and vars in filesys.c. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_FILESYS_H_) +#define _FILESYS_H_ + +/* The path on which we look for info files. You can initialize this + from the environment variable INFOPATH if there is one, or you can + call info_add_path () to add paths to the beginning or end of it. */ +extern char *infopath; + +/* Make INFOPATH have absolutely nothing in it. */ +extern void zap_infopath (); + +/* Add PATH to the list of paths found in INFOPATH. 2nd argument says + whether to put PATH at the front or end of INFOPATH. */ +extern void info_add_path (); + +/* Defines that are passed along with the pathname to info_add_path (). */ +#define INFOPATH_PREPEND 0 +#define INFOPATH_APPEND 1 + +/* Expand the filename in PARTIAL to make a real name for this operating + system. This looks in INFO_PATHS in order to find the correct file. + If it can't find the file, it returns NULL. */ +extern char *info_find_fullpath (); + +/* Read the contents of PATHNAME, returning a buffer with the contents of + that file in it, and returning the size of that buffer in FILESIZE. + FINFO is a stat struct which has already been filled in by the caller. + If the file cannot be read, return a NULL pointer. */ +extern char *filesys_read_info_file (); +extern char *filesys_read_compressed (); + +/* Return the command string that would be used to decompress FILENAME. */ +extern char *filesys_decompressor_for_file (); +extern int compressed_filename_p (); + +/* A function which returns a pointer to a static buffer containing + an error message for FILENAME and ERROR_NUM. */ +extern char *filesys_error_string (); + +/* The number of the most recent file system error. */ +extern int filesys_error_number; + +/* Given a string containing units of information separated by colons, + return the next one pointed to by IDX, or NULL if there are no more. + Advance IDX to the character after the colon. */ +extern char *extract_colon_unit (); + +/* The default value of INFOPATH. */ +#if !defined (DEFAULT_INFOPATH) +! # define DEFAULT_INFOPATH "/usr/local/info:/usr/info:/usr/local/lib/info:/usr/lib/info:/usr/local/gnu/info:/usr/local/gnu/lib/info:/usr/gnu/info:/usr/gnu/lib/info:/opt/gnu/info:/usr/share/info:/usr/share/lib/info:/usr/local/share/info:/usr/local/share/lib/info:/usr/gnu/lib/emacs/info:/usr/local/gnu/lib/emacs/info:/usr/local/lib/emacs/info:/usr/local/emacs/info:." +#endif /* !DEFAULT_INFOPATH */ + +#if !defined (S_ISREG) && defined (S_IFREG) +# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG) +#endif /* !S_ISREG && S_IFREG */ + +#if !defined (S_ISDIR) && defined (S_IFDIR) +# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR) +#endif /* !S_ISDIR && S_IFDIR */ + +#endif /* !_FILESYS_H_ */
new file mode 100644 --- /dev/null +++ b/info/footnotes.c @@ -0,0 +1,265 @@ +/* footnotes.c -- Some functions for manipulating footnotes. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include "info.h" + +/* Non-zero means attempt to show footnotes when displaying a new window. */ +int auto_footnotes_p = 1; + +static char *footnote_nodename = "*Footnotes*"; + +#define FOOTNOTE_HEADER_FORMAT \ + "*** Footnotes appearing in the node \"%s\" ***\n" + +/* Find the window currently showing footnotes. */ +static WINDOW * +find_footnotes_window () +{ + WINDOW *win; + + /* Try to find an existing window first. */ + for (win = windows; win; win = win->next) + if (internal_info_node_p (win->node) && + (strcmp (win->node->nodename, footnote_nodename) == 0)) + break; + + return (win); +} + +/* Manufacture a node containing the footnotes of this node, and + return the manufactured node. If NODE has no footnotes, return a + NULL pointer. */ +NODE * +make_footnotes_node (node) + NODE *node; +{ + NODE *fn_node, *result = (NODE *)NULL; + long fn_start; + + /* Make the initial assumption that the footnotes appear as simple + text within this windows node. */ + fn_node = node; + + /* See if this node contains the magic footnote label. */ + fn_start = + info_search_in_node (FOOTNOTE_LABEL, node, 0, (WINDOW *)NULL, 1); + + /* If it doesn't, check to see if it has an associated footnotes node. */ + if (fn_start == -1) + { + REFERENCE **refs; + + refs = info_xrefs_of_node (node); + + if (refs) + { + register int i; + char *refname; + + refname = (char *)xmalloc + (1 + strlen ("-Footnotes") + strlen (node->nodename)); + + strcpy (refname, node->nodename); + strcat (refname, "-Footnotes"); + + for (i = 0; refs[i]; i++) + if ((refs[i]->nodename != (char *)NULL) && + (strcmp (refs[i]->nodename, refname) == 0)) + { + char *filename; + + filename = node->parent; + if (!filename) + filename = node->filename; + + fn_node = info_get_node (filename, refname); + + if (fn_node) + fn_start = 0; + + break; + } + + free (refname); + info_free_references (refs); + } + } + + /* If we never found the start of a footnotes area, quit now. */ + if (fn_start == -1) + return ((NODE *)NULL); + + /* Make the new node. */ + result = (NODE *)xmalloc (sizeof (NODE)); + result->flags = 0; + + /* Get the size of the footnotes appearing within this node. */ + { + char *header; + long text_start = fn_start; + + header = (char *)xmalloc + (1 + strlen (node->nodename) + strlen (FOOTNOTE_HEADER_FORMAT)); + sprintf (header, FOOTNOTE_HEADER_FORMAT, node->nodename); + + /* Move the start of the displayed text to right after the first line. + This effectively skips either "---- footno...", or "File: foo...". */ + while (text_start < fn_node->nodelen) + if (fn_node->contents[text_start++] == '\n') + break; + + result->nodelen = strlen (header) + fn_node->nodelen - text_start; + + /* Set the contents of this node. */ + result->contents = (char *)xmalloc (1 + result->nodelen); + sprintf (result->contents, "%s", header); + memcpy (result->contents + strlen (header), + fn_node->contents + text_start, fn_node->nodelen - text_start); + + name_internal_node (result, footnote_nodename); + free (header); + } + +#if defined (NOTDEF) + /* If the footnotes were gleaned from the node that we were called with, + shorten the calling node's display length. */ + if (fn_node == node) + narrow_node (node, 0, fn_start); +#endif /* NOTDEF */ + + return (result); +} + +/* Create or delete the footnotes window depending on whether footnotes + exist in WINDOW's node or not. Returns FN_FOUND if footnotes were found + and displayed. Returns FN_UNFOUND if there were no footnotes found + in WINDOW's node. Returns FN_UNABLE if there were footnotes, but the + window to show them couldn't be made. */ +int +info_get_or_remove_footnotes (window) + WINDOW *window; +{ + WINDOW *fn_win; + NODE *new_footnotes; + + fn_win = find_footnotes_window (); + + /* If we are in the footnotes window, change nothing. */ + if (fn_win == window) + return (FN_FOUND); + + /* Try to find footnotes for this window's node. */ + new_footnotes = make_footnotes_node (window->node); + + /* If there was a window showing footnotes, and there are no footnotes + for the current window, delete the old footnote window. */ + if (fn_win && !new_footnotes) + { + if (windows->next) + info_delete_window_internal (fn_win); + } + + /* If there are footnotes for this window's node, but no window around + showing footnotes, try to make a new window. */ + if (new_footnotes && !fn_win) + { + WINDOW *old_active; + WINDOW *last, *win; + + /* Always make this window be the last one appearing in the list. Find + the last window in the chain. */ + for (win = windows, last = windows; win; last = win, win = win->next); + + /* Try to split this window, and make the split window the one to + contain the footnotes. */ + old_active = active_window; + active_window = last; + fn_win = window_make_window (new_footnotes); + active_window = old_active; + + if (!fn_win) + { + free (new_footnotes->contents); + free (new_footnotes); + + /* If we are hacking automatic footnotes, and there are footnotes + but we couldn't display them, print a message to that effect. */ + if (auto_footnotes_p) + inform_in_echo_area ("Footnotes could not be displayed"); + return (FN_UNABLE); + } + } + + /* If there are footnotes, and there is a window to display them, + make that window be the number of lines appearing in the footnotes. */ + if (new_footnotes && fn_win) + { + window_set_node_of_window (fn_win, new_footnotes); + + window_change_window_height + (fn_win, fn_win->line_count - fn_win->height); + + remember_window_and_node (fn_win, new_footnotes); + add_gcable_pointer (new_footnotes->contents); + } + + if (!new_footnotes) + return (FN_UNFOUND); + else + return (FN_FOUND); +} + +/* Show the footnotes associated with this node in another window. */ +DECLARE_INFO_COMMAND (info_show_footnotes, + "Show the footnotes associated with this node in another window") +{ + int result; + + /* A negative argument means just make the window go away. */ + if (count < 0) + { + WINDOW *fn_win = find_footnotes_window (); + + /* If there is an old footnotes window, and it isn't the only window + on the screen, delete it. */ + if (fn_win && windows->next) + info_delete_window_internal (fn_win); + } + else + { + int result; + + result = info_get_or_remove_footnotes (window); + + switch (result) + { + case FN_UNFOUND: + info_error (NO_FOOT_NODE); + break; + + case FN_UNABLE: + info_error (WIN_TOO_SMALL); + break; + } + } +}
new file mode 100644 --- /dev/null +++ b/info/footnotes.h @@ -0,0 +1,46 @@ +/* footnotes.h -- Some functions for manipulating footnotes. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_FOOTNOTES_H_) +#define _FOOTNOTES_H_ + +/* Magic string which indicates following text is footnotes. */ +#define FOOTNOTE_LABEL "---------- Footnotes ----------" + +#define FN_FOUND 0 +#define FN_UNFOUND 1 +#define FN_UNABLE 2 + + +/* Create or delete the footnotes window depending on whether footnotes + exist in WINDOW's node or not. Returns FN_FOUND if footnotes were found + and displayed. Returns FN_UNFOUND if there were no footnotes found + in WINDOW's node. Returns FN_UNABLE if there were footnotes, but the + window to show them couldn't be made. */ +extern int info_get_or_remove_footnotes (); + +/* Non-zero means attempt to show footnotes when displaying a new window. */ +extern int auto_footnotes_p; + +#endif /* !_FOOTNOTES_H_ */ +
new file mode 100644 --- /dev/null +++ b/info/gc.c @@ -0,0 +1,95 @@ +/* gc.c -- Functions to remember and garbage collect unused node contents. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include "info.h" + +/* Array of pointers to the contents of gc-able nodes. A pointer on this + list can be garbage collected when no info window contains a node whose + contents member match the pointer. */ +static char **gcable_pointers = (char **)NULL; +static int gcable_pointers_index = 0; +static int gcable_pointers_slots = 0; + +/* Add POINTER to the list of garbage collectible pointers. A pointer + is not actually garbage collected until no info window contains a node + whose contents member is equal to the pointer. */ +void +add_gcable_pointer (pointer) + char *pointer; +{ + gc_pointers (); + add_pointer_to_array (pointer, gcable_pointers_index, gcable_pointers, + gcable_pointers_slots, 10, char *); +} + +/* Grovel the list of info windows and gc-able pointers finding those + node->contents which are collectible, and free them. */ +void +gc_pointers () +{ + register int i, j, k; + INFO_WINDOW *iw; + char **new = (char **)NULL; + int new_index = 0; + int new_slots = 0; + + if (!info_windows || !gcable_pointers_index) + return; + + for (i = 0; iw = info_windows[i]; i++) + { + for (j = 0; j < iw->nodes_index; j++) + { + NODE *node = iw->nodes[j]; + + /* If this node->contents appears in our list of gcable_pointers, + it is not gc-able, so save it. */ + for (k = 0; k < gcable_pointers_index; k++) + if (gcable_pointers[k] == node->contents) + { + add_pointer_to_array + (node->contents, new_index, new, new_slots, 10, char *); + break; + } + } + } + + /* We have gathered all of the pointers which need to be saved. Free any + of the original pointers which do not appear in the new list. */ + for (i = 0; i < gcable_pointers_index; i++) + { + for (j = 0; j < new_index; j++) + if (gcable_pointers[i] == new[j]) + break; + + /* If we got all the way through the new list, then the old pointer + can be garbage collected. */ + if (new && !new[j]) + free (gcable_pointers[i]); + } + + free (gcable_pointers); + gcable_pointers = new; + gcable_pointers_slots = new_slots; + gcable_pointers_index = new_index; +}
new file mode 100644 --- /dev/null +++ b/info/gc.h @@ -0,0 +1,36 @@ +/* gc.h -- Functions for garbage collecting unused node contents. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_GC_H_) +#define _GC_H_ + +/* Add POINTER to the list of garbage collectible pointers. A pointer + is not actually garbage collected until no info window contains a node + whose contents member is equal to the pointer. */ +extern void add_gcable_pointer (); + +/* Grovel the list of info windows and gc-able pointers finding those + node->contents which are collectible, and free them. */ +extern void gc_pointers (); + +#endif /* !_GC_H_ */
new file mode 100644 --- /dev/null +++ b/info/general.h @@ -0,0 +1,94 @@ +/* general.h -- Some generally useful defines. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_GENERAL_H_) +#define _GENERAL_H_ + +extern void *xmalloc (), *xrealloc (); + +#if defined (HAVE_UNISTD_H) +# include <unistd.h> +#endif /* HAVE_UNISTD_H */ + +#if defined (HAVE_STRING_H) +# include <string.h> +#else +# include <strings.h> +#endif /* !HAVE_STRING_H */ + +#include "clib.h" + +#define info_toupper(x) (islower (x) ? toupper (x) : x) +#define info_tolower(x) (isupper (x) ? tolower (x) : x) + +#if !defined (whitespace) +# define whitespace(c) ((c == ' ') || (c == '\t')) +#endif /* !whitespace */ + +#if !defined (whitespace_or_newline) +# define whitespace_or_newline(c) (whitespace (c) || (c == '\n')) +#endif /* !whitespace_or_newline */ + +#if !defined (__FUNCTION_DEF) +# define __FUNCTION_DEF +typedef int Function (); +typedef void VFunction (); +typedef char *CFunction (); +#endif /* _FUNCTION_DEF */ + +/* Add POINTER to the list of pointers found in ARRAY. SLOTS is the number + of slots that have already been allocated. INDEX is the index into the + array where POINTER should be added. GROW is the number of slots to grow + ARRAY by, in the case that it needs growing. TYPE is a cast of the type + of object stored in ARRAY (e.g., NODE_ENTRY *. */ +#define add_pointer_to_array(pointer, idx, array, slots, grow, type) \ + do { \ + if (idx + 2 >= slots) \ + array = (type *)(xrealloc (array, (slots += grow) * sizeof (type))); \ + array[idx++] = (type)pointer; \ + array[idx] = (type)NULL; \ + } while (0) + +#define maybe_free(x) do { if (x) free (x); } while (0) + +#if !defined (zero_mem) && defined (HAVE_MEMSET) +# define zero_mem(mem, length) memset (mem, 0, length) +#endif /* !zero_mem && HAVE_MEMSET */ + +#if !defined (zero_mem) && defined (HAVE_BZERO) +# define zero_mem(mem, length) bzero (mem, length) +#endif /* !zero_mem && HAVE_BZERO */ + +#if !defined (zero_mem) +# define zero_mem(mem, length) \ + do { \ + register int zi; \ + register unsigned char *place; \ + \ + place = (unsigned char *)mem; \ + for (zi = 0; zi < length; zi++) \ + place[zi] = 0; \ + } while (0) +#endif /* !zero_mem */ + +#endif /* !_GENERAL_H_ */
new file mode 100644 --- /dev/null +++ b/info/getopt.c @@ -0,0 +1,762 @@ +/* Getopt for GNU. + NOTE: getopt is now part of the C library, so if you don't know what + "Keep this file name-space clean" means, talk to roland@gnu.ai.mit.edu + before changing it! + + Copyright (C) 1987, 88, 89, 90, 91, 92, 93, 94, 95 + Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation; either version 2, or (at your option) any + later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>. + Ditto for AIX 3.2 and <stdlib.h>. */ +#ifndef _NO_PROTO +#define _NO_PROTO +#endif + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#if !defined (__STDC__) || !__STDC__ +/* This is a separate conditional since some stdc systems + reject `defined (const)'. */ +#ifndef const +#define const +#endif +#endif + +#include <stdio.h> + +/* Comment out all this code if we are using the GNU C Library, and are not + actually compiling the library itself. This code is part of the GNU C + Library, but also included in many other GNU distributions. Compiling + and linking in this code is a waste when using the GNU C library + (especially if it is a shared library). Rather than having every GNU + program understand `configure --with-gnu-libc' and omit the object files, + it is simpler to just do this in the source for each such file. */ + +#if defined (_LIBC) || !defined (__GNU_LIBRARY__) + + +/* This needs to come after some library #include + to get __GNU_LIBRARY__ defined. */ +#ifdef __GNU_LIBRARY__ +/* Don't include stdlib.h for non-GNU C libraries because some of them + contain conflicting prototypes for getopt. */ +#include <stdlib.h> +#endif /* GNU C library. */ + +/* This is for other GNU distributions with internationalized messages. + The GNU C Library itself does not yet support such messages. */ +#if HAVE_LIBINTL_H +# include <libintl.h> +#else +# define gettext(msgid) (msgid) +#endif + +/* This version of `getopt' appears to the caller like standard Unix `getopt' + but it behaves differently for the user, since it allows the user + to intersperse the options with the other arguments. + + As `getopt' works, it permutes the elements of ARGV so that, + when it is done, all the options precede everything else. Thus + all application programs are extended to handle flexible argument order. + + Setting the environment variable POSIXLY_CORRECT disables permutation. + Then the behavior is completely standard. + + GNU application programs can use a third alternative mode in which + they can distinguish the relative order of options and other arguments. */ + +#include "getopt.h" + +/* For communication from `getopt' to the caller. + When `getopt' finds an option that takes an argument, + the argument value is returned here. + Also, when `ordering' is RETURN_IN_ORDER, + each non-option ARGV-element is returned here. */ + +char *optarg = NULL; + +/* Index in ARGV of the next element to be scanned. + This is used for communication to and from the caller + and for communication between successive calls to `getopt'. + + On entry to `getopt', zero means this is the first call; initialize. + + When `getopt' returns EOF, this is the index of the first of the + non-option elements that the caller should itself scan. + + Otherwise, `optind' communicates from one call to the next + how much of ARGV has been scanned so far. */ + +/* XXX 1003.2 says this must be 1 before any call. */ +int optind = 0; + +/* The next char to be scanned in the option-element + in which the last option character we returned was found. + This allows us to pick up the scan where we left off. + + If this is zero, or a null string, it means resume the scan + by advancing to the next ARGV-element. */ + +static char *nextchar; + +/* Callers store zero here to inhibit the error message + for unrecognized options. */ + +int opterr = 1; + +/* Set to an option character which was unrecognized. + This must be initialized on some systems to avoid linking in the + system's own getopt implementation. */ + +int optopt = '?'; + +/* Describe how to deal with options that follow non-option ARGV-elements. + + If the caller did not specify anything, + the default is REQUIRE_ORDER if the environment variable + POSIXLY_CORRECT is defined, PERMUTE otherwise. + + REQUIRE_ORDER means don't recognize them as options; + stop option processing when the first non-option is seen. + This is what Unix does. + This mode of operation is selected by either setting the environment + variable POSIXLY_CORRECT, or using `+' as the first character + of the list of option characters. + + PERMUTE is the default. We permute the contents of ARGV as we scan, + so that eventually all the non-options are at the end. This allows options + to be given in any order, even with programs that were not written to + expect this. + + RETURN_IN_ORDER is an option available to programs that were written + to expect options and other ARGV-elements in any order and that care about + the ordering of the two. We describe each non-option ARGV-element + as if it were the argument of an option with character code 1. + Using `-' as the first character of the list of option characters + selects this mode of operation. + + The special argument `--' forces an end of option-scanning regardless + of the value of `ordering'. In the case of RETURN_IN_ORDER, only + `--' can cause `getopt' to return EOF with `optind' != ARGC. */ + +static enum +{ + REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER +} ordering; + +/* Value of POSIXLY_CORRECT environment variable. */ +static char *posixly_correct; + +#ifdef __GNU_LIBRARY__ +/* We want to avoid inclusion of string.h with non-GNU libraries + because there are many ways it can cause trouble. + On some systems, it contains special magic macros that don't work + in GCC. */ +#include <string.h> +#define my_index strchr +#else + +/* Avoid depending on library functions or files + whose names are inconsistent. */ + +char *getenv (); + +static char * +my_index (str, chr) + const char *str; + int chr; +{ + while (*str) + { + if (*str == chr) + return (char *) str; + str++; + } + return 0; +} + +/* If using GCC, we can safely declare strlen this way. + If not using GCC, it is ok not to declare it. */ +#ifdef __GNUC__ +/* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h. + That was relevant to code that was here before. */ +#if !defined (__STDC__) || !__STDC__ +/* gcc with -traditional declares the built-in strlen to return int, + and has done so at least since version 2.4.5. -- rms. */ +extern int strlen (const char *); +#endif /* not __STDC__ */ +#endif /* __GNUC__ */ + +#endif /* not __GNU_LIBRARY__ */ + +/* Handle permutation of arguments. */ + +/* Describe the part of ARGV that contains non-options that have + been skipped. `first_nonopt' is the index in ARGV of the first of them; + `last_nonopt' is the index after the last of them. */ + +static int first_nonopt; +static int last_nonopt; + +/* Exchange two adjacent subsequences of ARGV. + One subsequence is elements [first_nonopt,last_nonopt) + which contains all the non-options that have been skipped so far. + The other is elements [last_nonopt,optind), which contains all + the options processed since those non-options were skipped. + + `first_nonopt' and `last_nonopt' are relocated so that they describe + the new indices of the non-options in ARGV after they are moved. */ + +static void +exchange (argv) + char **argv; +{ + int bottom = first_nonopt; + int middle = last_nonopt; + int top = optind; + char *tem; + + /* Exchange the shorter segment with the far end of the longer segment. + That puts the shorter segment into the right place. + It leaves the longer segment in the right place overall, + but it consists of two parts that need to be swapped next. */ + + while (top > middle && middle > bottom) + { + if (top - middle > middle - bottom) + { + /* Bottom segment is the short one. */ + int len = middle - bottom; + register int i; + + /* Swap it with the top part of the top segment. */ + for (i = 0; i < len; i++) + { + tem = argv[bottom + i]; + argv[bottom + i] = argv[top - (middle - bottom) + i]; + argv[top - (middle - bottom) + i] = tem; + } + /* Exclude the moved bottom segment from further swapping. */ + top -= len; + } + else + { + /* Top segment is the short one. */ + int len = top - middle; + register int i; + + /* Swap it with the bottom part of the bottom segment. */ + for (i = 0; i < len; i++) + { + tem = argv[bottom + i]; + argv[bottom + i] = argv[middle + i]; + argv[middle + i] = tem; + } + /* Exclude the moved top segment from further swapping. */ + bottom += len; + } + } + + /* Update records for the slots the non-options now occupy. */ + + first_nonopt += (optind - last_nonopt); + last_nonopt = optind; +} + +/* Initialize the internal data when the first call is made. */ + +static const char * +_getopt_initialize (optstring) + const char *optstring; +{ + /* Start processing options with ARGV-element 1 (since ARGV-element 0 + is the program name); the sequence of previously skipped + non-option ARGV-elements is empty. */ + + first_nonopt = last_nonopt = optind = 1; + + nextchar = NULL; + + posixly_correct = getenv ("POSIXLY_CORRECT"); + + /* Determine how to handle the ordering of options and nonoptions. */ + + if (optstring[0] == '-') + { + ordering = RETURN_IN_ORDER; + ++optstring; + } + else if (optstring[0] == '+') + { + ordering = REQUIRE_ORDER; + ++optstring; + } + else if (posixly_correct != NULL) + ordering = REQUIRE_ORDER; + else + ordering = PERMUTE; + + return optstring; +} + +/* Scan elements of ARGV (whose length is ARGC) for option characters + given in OPTSTRING. + + If an element of ARGV starts with '-', and is not exactly "-" or "--", + then it is an option element. The characters of this element + (aside from the initial '-') are option characters. If `getopt' + is called repeatedly, it returns successively each of the option characters + from each of the option elements. + + If `getopt' finds another option character, it returns that character, + updating `optind' and `nextchar' so that the next call to `getopt' can + resume the scan with the following option character or ARGV-element. + + If there are no more option characters, `getopt' returns `EOF'. + Then `optind' is the index in ARGV of the first ARGV-element + that is not an option. (The ARGV-elements have been permuted + so that those that are not options now come last.) + + OPTSTRING is a string containing the legitimate option characters. + If an option character is seen that is not listed in OPTSTRING, + return '?' after printing an error message. If you set `opterr' to + zero, the error message is suppressed but we still return '?'. + + If a char in OPTSTRING is followed by a colon, that means it wants an arg, + so the following text in the same ARGV-element, or the text of the following + ARGV-element, is returned in `optarg'. Two colons mean an option that + wants an optional arg; if there is text in the current ARGV-element, + it is returned in `optarg', otherwise `optarg' is set to zero. + + If OPTSTRING starts with `-' or `+', it requests different methods of + handling the non-option ARGV-elements. + See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above. + + Long-named options begin with `--' instead of `-'. + Their names may be abbreviated as long as the abbreviation is unique + or is an exact match for some defined option. If they have an + argument, it follows the option name in the same ARGV-element, separated + from the option name by a `=', or else the in next ARGV-element. + When `getopt' finds a long-named option, it returns 0 if that option's + `flag' field is nonzero, the value of the option's `val' field + if the `flag' field is zero. + + The elements of ARGV aren't really const, because we permute them. + But we pretend they're const in the prototype to be compatible + with other systems. + + LONGOPTS is a vector of `struct option' terminated by an + element containing a name which is zero. + + LONGIND returns the index in LONGOPT of the long-named option found. + It is only valid when a long-named option has been found by the most + recent call. + + If LONG_ONLY is nonzero, '-' as well as '--' can introduce + long-named options. */ + +int +_getopt_internal (argc, argv, optstring, longopts, longind, long_only) + int argc; + char *const *argv; + const char *optstring; + const struct option *longopts; + int *longind; + int long_only; +{ + optarg = NULL; + + if (optind == 0) + { + optstring = _getopt_initialize (optstring); + optind = 1; /* Don't scan ARGV[0], the program name. */ + } + + if (nextchar == NULL || *nextchar == '\0') + { + /* Advance to the next ARGV-element. */ + + if (ordering == PERMUTE) + { + /* If we have just processed some options following some non-options, + exchange them so that the options come first. */ + + if (first_nonopt != last_nonopt && last_nonopt != optind) + exchange ((char **) argv); + else if (last_nonopt != optind) + first_nonopt = optind; + + /* Skip any additional non-options + and extend the range of non-options previously skipped. */ + + while (optind < argc + && (argv[optind][0] != '-' || argv[optind][1] == '\0')) + optind++; + last_nonopt = optind; + } + + /* The special ARGV-element `--' means premature end of options. + Skip it like a null option, + then exchange with previous non-options as if it were an option, + then skip everything else like a non-option. */ + + if (optind != argc && !strcmp (argv[optind], "--")) + { + optind++; + + if (first_nonopt != last_nonopt && last_nonopt != optind) + exchange ((char **) argv); + else if (first_nonopt == last_nonopt) + first_nonopt = optind; + last_nonopt = argc; + + optind = argc; + } + + /* If we have done all the ARGV-elements, stop the scan + and back over any non-options that we skipped and permuted. */ + + if (optind == argc) + { + /* Set the next-arg-index to point at the non-options + that we previously skipped, so the caller will digest them. */ + if (first_nonopt != last_nonopt) + optind = first_nonopt; + return EOF; + } + + /* If we have come to a non-option and did not permute it, + either stop the scan or describe it to the caller and pass it by. */ + + if ((argv[optind][0] != '-' || argv[optind][1] == '\0')) + { + if (ordering == REQUIRE_ORDER) + return EOF; + optarg = argv[optind++]; + return 1; + } + + /* We have found another option-ARGV-element. + Skip the initial punctuation. */ + + nextchar = (argv[optind] + 1 + + (longopts != NULL && argv[optind][1] == '-')); + } + + /* Decode the current option-ARGV-element. */ + + /* Check whether the ARGV-element is a long option. + + If long_only and the ARGV-element has the form "-f", where f is + a valid short option, don't consider it an abbreviated form of + a long option that starts with f. Otherwise there would be no + way to give the -f short option. + + On the other hand, if there's a long option "fubar" and + the ARGV-element is "-fu", do consider that an abbreviation of + the long option, just like "--fu", and not "-f" with arg "u". + + This distinction seems to be the most useful approach. */ + + if (longopts != NULL + && (argv[optind][1] == '-' + || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1]))))) + { + char *nameend; + const struct option *p; + const struct option *pfound = NULL; + int exact = 0; + int ambig = 0; + int indfound; + int option_index; + + for (nameend = nextchar; *nameend && *nameend != '='; nameend++) + /* Do nothing. */ ; + + /* Test all long options for either exact match + or abbreviated matches. */ + for (p = longopts, option_index = 0; p->name; p++, option_index++) + if (!strncmp (p->name, nextchar, nameend - nextchar)) + { + if (nameend - nextchar == strlen (p->name)) + { + /* Exact match found. */ + pfound = p; + indfound = option_index; + exact = 1; + break; + } + else if (pfound == NULL) + { + /* First nonexact match found. */ + pfound = p; + indfound = option_index; + } + else + /* Second or later nonexact match found. */ + ambig = 1; + } + + if (ambig && !exact) + { + if (opterr) + fprintf (stderr, gettext ("%s: option `%s' is ambiguous\n"), + argv[0], argv[optind]); + nextchar += strlen (nextchar); + optind++; + return '?'; + } + + if (pfound != NULL) + { + option_index = indfound; + optind++; + if (*nameend) + { + /* Don't test has_arg with >, because some C compilers don't + allow it to be used on enums. */ + if (pfound->has_arg) + optarg = nameend + 1; + else + { + if (opterr) + if (argv[optind - 1][1] == '-') + /* --option */ + fprintf (stderr, + gettext ("%s: option `--%s' doesn't allow an argument\n"), + argv[0], pfound->name); + else + /* +option or -option */ + fprintf (stderr, + gettext ("%s: option `%c%s' doesn't allow an argument\n"), + argv[0], argv[optind - 1][0], pfound->name); + + nextchar += strlen (nextchar); + return '?'; + } + } + else if (pfound->has_arg == 1) + { + if (optind < argc) + optarg = argv[optind++]; + else + { + if (opterr) + fprintf (stderr, + gettext ("%s: option `%s' requires an argument\n"), + argv[0], argv[optind - 1]); + nextchar += strlen (nextchar); + return optstring[0] == ':' ? ':' : '?'; + } + } + nextchar += strlen (nextchar); + if (longind != NULL) + *longind = option_index; + if (pfound->flag) + { + *(pfound->flag) = pfound->val; + return 0; + } + return pfound->val; + } + + /* Can't find it as a long option. If this is not getopt_long_only, + or the option starts with '--' or is not a valid short + option, then it's an error. + Otherwise interpret it as a short option. */ + if (!long_only || argv[optind][1] == '-' + || my_index (optstring, *nextchar) == NULL) + { + if (opterr) + { + if (argv[optind][1] == '-') + /* --option */ + fprintf (stderr, gettext ("%s: unrecognized option `--%s'\n"), + argv[0], nextchar); + else + /* +option or -option */ + fprintf (stderr, gettext ("%s: unrecognized option `%c%s'\n"), + argv[0], argv[optind][0], nextchar); + } + nextchar = (char *) ""; + optind++; + return '?'; + } + } + + /* Look at and handle the next short option-character. */ + + { + char c = *nextchar++; + char *temp = my_index (optstring, c); + + /* Increment `optind' when we start to process its last character. */ + if (*nextchar == '\0') + ++optind; + + if (temp == NULL || c == ':') + { + if (opterr) + { + if (posixly_correct) + /* 1003.2 specifies the format of this message. */ + fprintf (stderr, gettext ("%s: illegal option -- %c\n"), + argv[0], c); + else + fprintf (stderr, gettext ("%s: invalid option -- %c\n"), + argv[0], c); + } + optopt = c; + return '?'; + } + if (temp[1] == ':') + { + if (temp[2] == ':') + { + /* This is an option that accepts an argument optionally. */ + if (*nextchar != '\0') + { + optarg = nextchar; + optind++; + } + else + optarg = NULL; + nextchar = NULL; + } + else + { + /* This is an option that requires an argument. */ + if (*nextchar != '\0') + { + optarg = nextchar; + /* If we end this ARGV-element by taking the rest as an arg, + we must advance to the next element now. */ + optind++; + } + else if (optind == argc) + { + if (opterr) + { + /* 1003.2 specifies the format of this message. */ + fprintf (stderr, + gettext ("%s: option requires an argument -- %c\n"), + argv[0], c); + } + optopt = c; + if (optstring[0] == ':') + c = ':'; + else + c = '?'; + } + else + /* We already incremented `optind' once; + increment it again when taking next ARGV-elt as argument. */ + optarg = argv[optind++]; + nextchar = NULL; + } + } + return c; + } +} + +int +getopt (argc, argv, optstring) + int argc; + char *const *argv; + const char *optstring; +{ + return _getopt_internal (argc, argv, optstring, + (const struct option *) 0, + (int *) 0, + 0); +} + +#endif /* _LIBC or not __GNU_LIBRARY__. */ + +#ifdef TEST + +/* Compile with -DTEST to make an executable for use in testing + the above definition of `getopt'. */ + +int +main (argc, argv) + int argc; + char **argv; +{ + int c; + int digit_optind = 0; + + while (1) + { + int this_option_optind = optind ? optind : 1; + + c = getopt (argc, argv, "abc:d:0123456789"); + if (c == EOF) + break; + + switch (c) + { + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + if (digit_optind != 0 && digit_optind != this_option_optind) + printf ("digits occur in two different argv-elements.\n"); + digit_optind = this_option_optind; + printf ("option %c\n", c); + break; + + case 'a': + printf ("option a\n"); + break; + + case 'b': + printf ("option b\n"); + break; + + case 'c': + printf ("option c with value `%s'\n", optarg); + break; + + case '?': + break; + + default: + printf ("?? getopt returned character code 0%o ??\n", c); + } + } + + if (optind < argc) + { + printf ("non-option ARGV-elements: "); + while (optind < argc) + printf ("%s ", argv[optind++]); + printf ("\n"); + } + + exit (0); +} + +#endif /* TEST */
new file mode 100644 --- /dev/null +++ b/info/getopt.h @@ -0,0 +1,129 @@ +/* Declarations for getopt. + Copyright (C) 1989, 90, 91, 92, 93, 94 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation; either version 2, or (at your option) any + later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#ifndef _GETOPT_H +#define _GETOPT_H 1 + +#ifdef __cplusplus +extern "C" { +#endif + +/* For communication from `getopt' to the caller. + When `getopt' finds an option that takes an argument, + the argument value is returned here. + Also, when `ordering' is RETURN_IN_ORDER, + each non-option ARGV-element is returned here. */ + +extern char *optarg; + +/* Index in ARGV of the next element to be scanned. + This is used for communication to and from the caller + and for communication between successive calls to `getopt'. + + On entry to `getopt', zero means this is the first call; initialize. + + When `getopt' returns EOF, this is the index of the first of the + non-option elements that the caller should itself scan. + + Otherwise, `optind' communicates from one call to the next + how much of ARGV has been scanned so far. */ + +extern int optind; + +/* Callers store zero here to inhibit the error message `getopt' prints + for unrecognized options. */ + +extern int opterr; + +/* Set to an option character which was unrecognized. */ + +extern int optopt; + +/* Describe the long-named options requested by the application. + The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector + of `struct option' terminated by an element containing a name which is + zero. + + The field `has_arg' is: + no_argument (or 0) if the option does not take an argument, + required_argument (or 1) if the option requires an argument, + optional_argument (or 2) if the option takes an optional argument. + + If the field `flag' is not NULL, it points to a variable that is set + to the value given in the field `val' when the option is found, but + left unchanged if the option is not found. + + To have a long-named option do something other than set an `int' to + a compiled-in constant, such as set a value from `optarg', set the + option's `flag' field to zero and its `val' field to a nonzero + value (the equivalent single-letter option character, if there is + one). For long options that have a zero `flag' field, `getopt' + returns the contents of the `val' field. */ + +struct option +{ +#if defined (__STDC__) && __STDC__ + const char *name; +#else + char *name; +#endif + /* has_arg can't be an enum because some compilers complain about + type mismatches in all the code that assumes it is an int. */ + int has_arg; + int *flag; + int val; +}; + +/* Names for the values of the `has_arg' field of `struct option'. */ + +#define no_argument 0 +#define required_argument 1 +#define optional_argument 2 + +#if defined (__STDC__) && __STDC__ +#ifdef __GNU_LIBRARY__ +/* Many other libraries have conflicting prototypes for getopt, with + differences in the consts, in stdlib.h. To avoid compilation + errors, only prototype getopt for the GNU C library. */ +extern int getopt (int argc, char *const *argv, const char *shortopts); +#else /* not __GNU_LIBRARY__ */ +extern int getopt (); +#endif /* __GNU_LIBRARY__ */ +extern int getopt_long (int argc, char *const *argv, const char *shortopts, + const struct option *longopts, int *longind); +extern int getopt_long_only (int argc, char *const *argv, + const char *shortopts, + const struct option *longopts, int *longind); + +/* Internal only. Users should not call this directly. */ +extern int _getopt_internal (int argc, char *const *argv, + const char *shortopts, + const struct option *longopts, int *longind, + int long_only); +#else /* not __STDC__ */ +extern int getopt (); +extern int getopt_long (); +extern int getopt_long_only (); + +extern int _getopt_internal (); +#endif /* __STDC__ */ + +#ifdef __cplusplus +} +#endif + +#endif /* _GETOPT_H */
new file mode 100644 --- /dev/null +++ b/info/getopt1.c @@ -0,0 +1,180 @@ +/* getopt_long and getopt_long_only entry points for GNU getopt. + Copyright (C) 1987, 88, 89, 90, 91, 92, 1993, 1994 + Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation; either version 2, or (at your option) any + later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include "getopt.h" + +#if !defined (__STDC__) || !__STDC__ +/* This is a separate conditional since some stdc systems + reject `defined (const)'. */ +#ifndef const +#define const +#endif +#endif + +#include <stdio.h> + +/* Comment out all this code if we are using the GNU C Library, and are not + actually compiling the library itself. This code is part of the GNU C + Library, but also included in many other GNU distributions. Compiling + and linking in this code is a waste when using the GNU C library + (especially if it is a shared library). Rather than having every GNU + program understand `configure --with-gnu-libc' and omit the object files, + it is simpler to just do this in the source for each such file. */ + +#if defined (_LIBC) || !defined (__GNU_LIBRARY__) + + +/* This needs to come after some library #include + to get __GNU_LIBRARY__ defined. */ +#ifdef __GNU_LIBRARY__ +#include <stdlib.h> +#else +char *getenv (); +#endif + +#ifndef NULL +#define NULL 0 +#endif + +int +getopt_long (argc, argv, options, long_options, opt_index) + int argc; + char *const *argv; + const char *options; + const struct option *long_options; + int *opt_index; +{ + return _getopt_internal (argc, argv, options, long_options, opt_index, 0); +} + +/* Like getopt_long, but '-' as well as '--' can indicate a long option. + If an option that starts with '-' (not '--') doesn't match a long option, + but does match a short option, it is parsed as a short option + instead. */ + +int +getopt_long_only (argc, argv, options, long_options, opt_index) + int argc; + char *const *argv; + const char *options; + const struct option *long_options; + int *opt_index; +{ + return _getopt_internal (argc, argv, options, long_options, opt_index, 1); +} + + +#endif /* _LIBC or not __GNU_LIBRARY__. */ + +#ifdef TEST + +#include <stdio.h> + +int +main (argc, argv) + int argc; + char **argv; +{ + int c; + int digit_optind = 0; + + while (1) + { + int this_option_optind = optind ? optind : 1; + int option_index = 0; + static struct option long_options[] = + { + {"add", 1, 0, 0}, + {"append", 0, 0, 0}, + {"delete", 1, 0, 0}, + {"verbose", 0, 0, 0}, + {"create", 0, 0, 0}, + {"file", 1, 0, 0}, + {0, 0, 0, 0} + }; + + c = getopt_long (argc, argv, "abc:d:0123456789", + long_options, &option_index); + if (c == EOF) + break; + + switch (c) + { + case 0: + printf ("option %s", long_options[option_index].name); + if (optarg) + printf (" with arg %s", optarg); + printf ("\n"); + break; + + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + if (digit_optind != 0 && digit_optind != this_option_optind) + printf ("digits occur in two different argv-elements.\n"); + digit_optind = this_option_optind; + printf ("option %c\n", c); + break; + + case 'a': + printf ("option a\n"); + break; + + case 'b': + printf ("option b\n"); + break; + + case 'c': + printf ("option c with value `%s'\n", optarg); + break; + + case 'd': + printf ("option d with value `%s'\n", optarg); + break; + + case '?': + break; + + default: + printf ("?? getopt returned character code 0%o ??\n", c); + } + } + + if (optind < argc) + { + printf ("non-option ARGV-elements: "); + while (optind < argc) + printf ("%s ", argv[optind++]); + printf ("\n"); + } + + exit (0); +} + +#endif /* TEST */
new file mode 100644 --- /dev/null +++ b/info/indices.c @@ -0,0 +1,731 @@ +/* indices.c -- Commands for dealing with an Info file Index. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include "info.h" +#include "indices.h" + +/* User-visible variable controls the output of info-index-next. */ +int show_index_match = 1; + +/* In the Info sense, an index is a menu. This variable holds the last + parsed index. */ +static REFERENCE **index_index = (REFERENCE **)NULL; + +/* The offset of the most recently selected index element. */ +static int index_offset = 0; + +/* Variable which holds the last string searched for. */ +static char *index_search = (char *)NULL; + +/* A couple of "globals" describing where the initial index was found. */ +static char *initial_index_filename = (char *)NULL; +static char *initial_index_nodename = (char *)NULL; + +/* A structure associating index names with index offset ranges. */ +typedef struct { + char *name; /* The nodename of this index. */ + int first; /* The index in our list of the first entry. */ + int last; /* The index in our list of the last entry. */ +} INDEX_NAME_ASSOC; + +/* An array associating index nodenames with index offset ranges. */ +static INDEX_NAME_ASSOC **index_nodenames = (INDEX_NAME_ASSOC **)NULL; +static int index_nodenames_index = 0; +static int index_nodenames_slots = 0; + +/* Add the name of NODE, and the range of the associated index elements + (passed in ARRAY) to index_nodenames. */ +static void +add_index_to_index_nodenames (array, node) + REFERENCE **array; + NODE *node; +{ + register int i, last; + INDEX_NAME_ASSOC *assoc; + + for (last = 0; array[last]; last++); + assoc = (INDEX_NAME_ASSOC *)xmalloc (sizeof (INDEX_NAME_ASSOC)); + assoc->name = strdup (node->nodename); + + if (!index_nodenames_index) + { + assoc->first = 0; + assoc->last = last; + } + else + { + for (i = 0; index_nodenames[i + 1]; i++); + assoc->first = 1 + index_nodenames[i]->last; + assoc->last = assoc->first + last; + } + add_pointer_to_array + (assoc, index_nodenames_index, index_nodenames, index_nodenames_slots, + 10, INDEX_NAME_ASSOC *); +} + +/* Find and return the indices of WINDOW's file. The indices are defined + as the first node in the file containing the word "Index" and any + immediately following nodes whose names also contain "Index". All such + indices are concatenated and the result returned. If WINDOW's info file + doesn't have any indices, a NULL pointer is returned. */ +REFERENCE ** +info_indices_of_window (window) + WINDOW *window; +{ + FILE_BUFFER *fb; + + fb = file_buffer_of_window (window); + + return (info_indices_of_file_buffer (fb)); +} + +REFERENCE ** +info_indices_of_file_buffer (file_buffer) + FILE_BUFFER *file_buffer; +{ + register int i; + REFERENCE **result = (REFERENCE **)NULL; + + /* No file buffer, no indices. */ + if (!file_buffer) + return ((REFERENCE **)NULL); + + /* Reset globals describing where the index was found. */ + maybe_free (initial_index_filename); + maybe_free (initial_index_nodename); + initial_index_filename = (char *)NULL; + initial_index_nodename = (char *)NULL; + + if (index_nodenames) + { + for (i = 0; index_nodenames[i]; i++) + { + free (index_nodenames[i]->name); + free (index_nodenames[i]); + } + + index_nodenames_index = 0; + index_nodenames[0] = (INDEX_NAME_ASSOC *)NULL; + } + + /* Grovel the names of the nodes found in this file. */ + if (file_buffer->tags) + { + TAG *tag; + + for (i = 0; tag = file_buffer->tags[i]; i++) + { + if (string_in_line ("Index", tag->nodename) != -1) + { + NODE *node; + REFERENCE **menu; + + /* Found one. Get its menu. */ + node = info_get_node (tag->filename, tag->nodename); + if (!node) + continue; + + /* Remember the filename and nodename of this index. */ + initial_index_filename = strdup (file_buffer->filename); + initial_index_nodename = strdup (tag->nodename); + + menu = info_menu_of_node (node); + + /* If we have a menu, add this index's nodename and range + to our list of index_nodenames. */ + if (menu) + { + add_index_to_index_nodenames (menu, node); + + /* Concatenate the references found so far. */ + result = info_concatenate_references (result, menu); + } + free (node); + } + } + } + + /* If there is a result, clean it up so that every entry has a filename. */ + for (i = 0; result && result[i]; i++) + if (!result[i]->filename) + result[i]->filename = strdup (file_buffer->filename); + + return (result); +} + +DECLARE_INFO_COMMAND (info_index_search, + "Look up a string in the index for this file") +{ + do_info_index_search (window, count, 0); +} + +/* Look up SEARCH_STRING in the index for this file. If SEARCH_STRING + is NULL, prompt user for input. */ +void +do_info_index_search (window, count, search_string) + WINDOW *window; + int count; + char *search_string; +{ + FILE_BUFFER *fb; + char *line; + + /* Reset the index offset, since this is not the info-index-next command. */ + index_offset = 0; + + /* The user is selecting a new search string, so flush the old one. */ + maybe_free (index_search); + index_search = (char *)NULL; + + /* If this window's file is not the same as the one that we last built an + index for, build and remember an index now. */ + fb = file_buffer_of_window (window); + if (!initial_index_filename || + (strcmp (initial_index_filename, fb->filename) != 0)) + { + info_free_references (index_index); + window_message_in_echo_area ("Finding index entries..."); + index_index = info_indices_of_file_buffer (fb); + } + + /* If there is no index, quit now. */ + if (!index_index) + { + info_error ("No indices found."); + return; + } + + /* Okay, there is an index. Look for SEARCH_STRING, or, if it is + empty, prompt for one. */ + if (search_string && *search_string) + line = strdup (search_string); + else + { + line = + info_read_maybe_completing (window, "Index entry: ", index_index); + + window = active_window; + + /* User aborted? */ + if (!line) + { + info_abort_key (active_window, 1, 0); + return; + } + + /* Empty line means move to the Index node. */ + if (!*line) + { + free (line); + + if (initial_index_filename && initial_index_nodename) + { + NODE *node; + + node = + info_get_node (initial_index_filename, initial_index_nodename); + set_remembered_pagetop_and_point (window); + window_set_node_of_window (window, node); + remember_window_and_node (window, node); + window_clear_echo_area (); + return; + } + } + } + + /* The user typed either a completed index label, or a partial string. + Find an exact match, or, failing that, the first index entry containing + the partial string. So, we just call info_next_index_match () with minor + manipulation of INDEX_OFFSET. */ + { + int old_offset; + + /* Start the search right after/before this index. */ + if (count < 0) + { + register int i; + for (i = 0; index_index[i]; i++); + index_offset = i; + } + else + index_offset = -1; + + old_offset = index_offset; + + /* The "last" string searched for is this one. */ + index_search = line; + + /* Find it, or error. */ + info_next_index_match (window, count, 0); + + /* If the search failed, return the index offset to where it belongs. */ + if (index_offset == old_offset) + index_offset = 0; + } +} + +int +index_entry_exists (window, string) + WINDOW *window; + char *string; +{ + register int i; + FILE_BUFFER *fb; + + /* If there is no previous search string, the user hasn't built an index + yet. */ + if (!string) + return 0; + + fb = file_buffer_of_window (window); + if (!initial_index_filename || + (strcmp (initial_index_filename, fb->filename) != 0)) + { + info_free_references (index_index); + index_index = info_indices_of_file_buffer (fb); + } + + /* If there is no index, that is an error. */ + if (!index_index) + return 0; + + for (i = 0; (i > -1) && (index_index[i]); i++) + if (strcmp (string, index_index[i]->label) == 0) + break; + + /* If that failed, look for the next substring match. */ + if ((i < 0) || (!index_index[i])) + { + for (i = 0; (i > -1) && (index_index[i]); i++) + if (string_in_line (string, index_index[i]->label) != -1) + break; + + if ((i > -1) && (index_index[i])) + string_in_line (string, index_index[i]->label); + } + + /* If that failed, return 0. */ + if ((i < 0) || (!index_index[i])) + return 0; + + return 1; +} + +DECLARE_INFO_COMMAND (info_next_index_match, + "Go to the next matching index item from the last `\\[index-search]' command") +{ + register int i; + int partial, dir; + NODE *node; + + /* If there is no previous search string, the user hasn't built an index + yet. */ + if (!index_search) + { + info_error ("No previous index search string."); + return; + } + + /* If there is no index, that is an error. */ + if (!index_index) + { + info_error ("No index entries."); + return; + } + + /* The direction of this search is controlled by the value of the + numeric argument. */ + if (count < 0) + dir = -1; + else + dir = 1; + + /* Search for the next occurence of index_search. First try to find + an exact match. */ + partial = 0; + + for (i = index_offset + dir; (i > -1) && (index_index[i]); i += dir) + if (strcmp (index_search, index_index[i]->label) == 0) + break; + + /* If that failed, look for the next substring match. */ + if ((i < 0) || (!index_index[i])) + { + for (i = index_offset + dir; (i > -1) && (index_index[i]); i += dir) + if (string_in_line (index_search, index_index[i]->label) != -1) + break; + + if ((i > -1) && (index_index[i])) + partial = string_in_line (index_search, index_index[i]->label); + } + + /* If that failed, print an error. */ + if ((i < 0) || (!index_index[i])) + { + info_error ("No %sindex entries containing \"%s\".", + index_offset > 0 ? "more " : "", index_search); + return; + } + + /* Okay, we found the next one. Move the offset to the current entry. */ + index_offset = i; + + /* Report to the user on what we have found. */ + { + register int j; + char *name = "CAN'T SEE THIS"; + char *match; + + for (j = 0; index_nodenames[j]; j++) + { + if ((i >= index_nodenames[j]->first) && + (i <= index_nodenames[j]->last)) + { + name = index_nodenames[j]->name; + break; + } + } + + /* If we had a partial match, indicate to the user which part of the + string matched. */ + match = strdup (index_index[i]->label); + + if (partial && show_index_match) + { + int j, ls, start, upper; + + ls = strlen (index_search); + start = partial - ls; + upper = isupper (match[start]) ? 1 : 0; + + for (j = 0; j < ls; j++) + if (upper) + match[j + start] = info_tolower (match[j + start]); + else + match[j + start] = info_toupper (match[j + start]); + } + + { + char *format; + + format = replace_in_documentation + ("Found \"%s\" in %s. (`\\[next-index-match]' tries to find next.)"); + + window_message_in_echo_area (format, match, name); + } + + free (match); + } + + /* Select the node corresponding to this index entry. */ + node = info_get_node (index_index[i]->filename, index_index[i]->nodename); + + if (!node) + { + info_error (CANT_FILE_NODE, + index_index[i]->filename, index_index[i]->nodename); + return; + } + + set_remembered_pagetop_and_point (window); + window_set_node_of_window (window, node); + remember_window_and_node (window, node); + + + /* Try to find an occurence of LABEL in this node. */ + { + long start, loc; + + start = window->line_starts[1] - window->node->contents; + loc = info_target_search_node (node, index_index[i]->label, start); + + if (loc != -1) + { + window->point = loc; + window_adjust_pagetop (window); + } + } +} + +/* **************************************************************** */ +/* */ +/* Info APROPOS: Search every known index. */ +/* */ +/* **************************************************************** */ + +/* For every menu item in DIR, search the indices of that file for + SEARCH_STRING. */ +REFERENCE ** +apropos_in_all_indices (search_string, inform) + char *search_string; + int inform; +{ + register int i, dir_index; + REFERENCE **all_indices = (REFERENCE **)NULL; + REFERENCE **dir_menu = (REFERENCE **)NULL; + NODE *dir_node; + int printed = 0; + + dir_node = info_get_node ("dir", "Top"); + if (dir_node) + dir_menu = info_menu_of_node (dir_node); + + if (!dir_menu) + return; + + /* For every menu item in DIR, get the associated node's file buffer and + read the indices of that file buffer. Gather all of the indices into + one large one. */ + for (dir_index = 0; dir_menu[dir_index]; dir_index++) + { + REFERENCE **this_index, *this_item; + NODE *this_node; + FILE_BUFFER *this_fb; + + this_item = dir_menu[dir_index]; + + if (!this_item->filename) + { + if (dir_node->parent) + this_item->filename = strdup (dir_node->parent); + else + this_item->filename = strdup (dir_node->filename); + } + + /* Find this node. If we cannot find it, try using the label of the + entry as a file (i.e., "(LABEL)Top"). */ + this_node = info_get_node (this_item->filename, this_item->nodename); + + if (!this_node && this_item->nodename && + (strcmp (this_item->label, this_item->nodename) == 0)) + this_node = info_get_node (this_item->label, "Top"); + + if (!this_node) + continue; + + /* Get the file buffer associated with this node. */ + { + char *files_name; + + files_name = this_node->parent; + if (!files_name) + files_name = this_node->filename; + + this_fb = info_find_file (files_name); + + if (this_fb && inform) + message_in_echo_area ("Scanning indices of \"%s\"...", files_name); + + this_index = info_indices_of_file_buffer (this_fb); + free (this_node); + + if (this_fb && inform) + unmessage_in_echo_area (); + } + + if (this_index) + { + /* Remember the filename which contains this set of references. */ + for (i = 0; this_index && this_index[i]; i++) + if (!this_index[i]->filename) + this_index[i]->filename = strdup (this_fb->filename); + + /* Concatenate with the other indices. */ + all_indices = info_concatenate_references (all_indices, this_index); + } + } + + info_free_references (dir_menu); + + /* Build a list of the references which contain SEARCH_STRING. */ + if (all_indices) + { + REFERENCE *entry, **apropos_list = (REFERENCE **)NULL; + int apropos_list_index = 0; + int apropos_list_slots = 0; + + for (i = 0; (entry = all_indices[i]); i++) + { + if (string_in_line (search_string, entry->label) != -1) + { + add_pointer_to_array + (entry, apropos_list_index, apropos_list, apropos_list_slots, + 100, REFERENCE *); + } + else + { + maybe_free (entry->label); + maybe_free (entry->filename); + maybe_free (entry->nodename); + free (entry); + } + } + + free (all_indices); + all_indices = apropos_list; + } + return (all_indices); +} + +#define APROPOS_NONE \ + "No available info files reference \"%s\" in their indices." + +void +info_apropos (string) + char *string; +{ + REFERENCE **apropos_list; + + apropos_list = apropos_in_all_indices (string, 0); + + if (!apropos_list) + { + info_error (APROPOS_NONE, string); + } + else + { + register int i; + REFERENCE *entry; + + for (i = 0; (entry = apropos_list[i]); i++) + fprintf (stderr, "\"(%s)%s\" -- %s\n", + entry->filename, entry->nodename, entry->label); + } + info_free_references (apropos_list); +} + +static char *apropos_list_nodename = "*Apropos*"; + +DECLARE_INFO_COMMAND (info_index_apropos, + "Grovel all known info file's indices for a string and build a menu") +{ + char *line; + + line = info_read_in_echo_area (window, "Index apropos: "); + + window = active_window; + + /* User aborted? */ + if (!line) + { + info_abort_key (window, 1, 1); + return; + } + + /* User typed something? */ + if (*line) + { + REFERENCE **apropos_list; + NODE *apropos_node; + + apropos_list = apropos_in_all_indices (line, 1); + + if (!apropos_list) + { + info_error (APROPOS_NONE, line); + } + else + { + register int i; + char *line_buffer; + + initialize_message_buffer (); + printf_to_message_buffer + ("\n* Menu: Nodes whoses indices contain \"%s\":\n", line); + line_buffer = (char *)xmalloc (500); + + for (i = 0; apropos_list[i]; i++) + { + int len; + sprintf (line_buffer, "* (%s)%s::", + apropos_list[i]->filename, apropos_list[i]->nodename); + len = pad_to (36, line_buffer); + sprintf (line_buffer + len, "%s", apropos_list[i]->label); + printf_to_message_buffer ("%s\n", line_buffer); + } + free (line_buffer); + } + + apropos_node = message_buffer_to_node (); + add_gcable_pointer (apropos_node->contents); + name_internal_node (apropos_node, apropos_list_nodename); + + /* Even though this is an internal node, we don't want the window + system to treat it specially. So we turn off the internalness + of it here. */ + apropos_node->flags &= ~N_IsInternal; + + /* Find/Create a window to contain this node. */ + { + WINDOW *new; + NODE *node; + + set_remembered_pagetop_and_point (window); + + /* If a window is visible and showing an apropos list already, + re-use it. */ + for (new = windows; new; new = new->next) + { + node = new->node; + + if (internal_info_node_p (node) && + (strcmp (node->nodename, apropos_list_nodename) == 0)) + break; + } + + /* If we couldn't find an existing window, try to use the next window + in the chain. */ + if (!new && window->next) + new = window->next; + + /* If we still don't have a window, make a new one to contain + the list. */ + if (!new) + { + WINDOW *old_active; + + old_active = active_window; + active_window = window; + new = window_make_window ((NODE *)NULL); + active_window = old_active; + } + + /* If we couldn't make a new window, use this one. */ + if (!new) + new = window; + + /* Lines do not wrap in this window. */ + new->flags |= W_NoWrap; + + window_set_node_of_window (new, apropos_node); + remember_window_and_node (new, apropos_node); + active_window = new; + } + info_free_references (apropos_list); + } + free (line); + + if (!info_error_was_printed) + window_clear_echo_area (); +} +
new file mode 100644 --- /dev/null +++ b/info/indices.h @@ -0,0 +1,41 @@ +/* indices.h -- Functions defined in indices.c. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_INDICES_H_) +#define _INDICES_H_ + +/* User-visible variable controls the output of info-index-next. */ +extern int show_index_match; + +extern REFERENCE **info_indices_of_window (), **info_indices_of_file_buffer (); +extern void info_apropos (); + +/* For every menu item in DIR, search the indices of that file for STRING. */ +REFERENCE **apropos_in_all_indices (); + +/* User visible functions declared in indices.c. */ +extern void info_index_search (), info_next_index_match (); +extern void do_info_index_search (); +extern int index_intry_exists (); + +#endif /* !_INDICES_H_ */
new file mode 100644 --- /dev/null +++ b/info/info-stnd.texi @@ -0,0 +1,1365 @@ +\input texinfo @c -*-texinfo-*- +@comment %**start of header +@setfilename info-stnd.info +@settitle GNU Info +@set InfoProgVer 2.11 +@paragraphindent none +@footnotestyle end +@synindex vr cp +@synindex fn cp +@synindex ky cp +@comment %**end of header +@comment $Id: info-stnd.texi,v 1.3 1996-11-13 03:41:41 jwe Exp $ + +@dircategory Texinfo documentation system +@direntry +* info program: (info-stnd). Standalone Info-reading program. +@end direntry + +@ifinfo +This file documents GNU Info, a program for viewing the on-line formatted +versions of Texinfo files. This documentation is different from the +documentation for the Info reader that is part of GNU Emacs. If you do +not know how to use Info, but have a working Info reader, you should +read that documentation first. + +Copyright @copyright{} 1992, 93, 96 Free Software Foundation, Inc. + +Permission is granted to make and distribute verbatim copies of this +manual provided the copyright notice and this permission notice are +preserved on all copies. + +@ignore +Permission is granted to process this file through TeX and print the +results, provided the printed document carries a copying permission +notice identical to this one except for the removal of this paragraph +(this paragraph not being relevant to the printed manual). +@end ignore + +Permission is granted to copy and distribute modified versions of this +manual under the conditions for verbatim copying, provided also that the +sections entitled ``Copying'' and ``GNU General Public License'' are +included exactly as in the original, and provided that the entire +resulting derived work is distributed under the terms of a permission +notice identical to this one. + +Permission is granted to copy and distribute translations of this manual +into another language, under the above conditions for modified versions, +except that this permission notice may be stated in a translation +approved by the Free Software Foundation. +@end ifinfo + +@titlepage +@title GNU Info User's Guide +@subtitle For GNU Info version @value{InfoProgVer} +@author Brian J. Fox (bfox@@ai.mit.edu) +@page +@vskip 0pt plus 1filll +Copyright @copyright{} 1992, 1993 Free Software Foundation + +Permission is granted to make and distribute verbatim copies of this +manual provided the copyright notice and this permission notice are +preserved on all copies. + +Permission is granted to copy and distribute modified versions of this +manual under the conditions for verbatim copying, provided also that the +sections entitled ``Copying'' and ``GNU General Public License'' are +included exactly as in the original, and provided that the entire +resulting derived work is distributed under the terms of a permission +notice identical to this one. + +Permission is granted to copy and distribute translations of this manual +into another language, under the above conditions for modified versions, +except that this permission notice may be stated in a translation +approved by the Free Software Foundation. +@end titlepage + +@ifinfo +@node Top, What is Info, (dir), (dir) +@top The GNU Info Program + +This file documents GNU Info, a program for viewing the on-line +formatted versions of Texinfo files, version @value{InfoProgVer}. This +documentation is different from the documentation for the Info reader +that is part of GNU Emacs. +@end ifinfo + +@menu +* What is Info:: +* Options:: Options you can pass on the command line. +* Cursor Commands:: Commands which move the cursor within a node. +* Scrolling Commands:: Commands for moving the node around + in a window. +* Node Commands:: Commands for selecting a new node. +* Searching Commands:: Commands for searching an Info file. +* Xref Commands:: Commands for selecting cross references. +* Window Commands:: Commands which manipulate multiple windows. +* Printing Nodes:: How to print out the contents of a node. +* Miscellaneous Commands:: A few commands that defy categories. +* Variables:: How to change the default behavior of Info. +* GNU Info Global Index:: Global index containing keystrokes, + command names, variable names, + and general concepts. +@end menu + +@node What is Info, Options, Top, Top +@chapter What is Info? + +@iftex +This file documents GNU Info, a program for viewing the on-line formatted +versions of Texinfo files, version @value{InfoProgVer}. +@end iftex + +@dfn{Info} is a program which is used to view Info files on an ASCII +terminal. @dfn{Info files} are the result of processing Texinfo files +with the program @code{makeinfo} or with one of the Emacs commands, such +as @code{M-x texinfo-format-buffer}. Texinfo itself is a documentation +system that uses a single source file to produce both on-line +information and printed output. You can typeset and print the +files that you read in Info.@refill + +@node Options, Cursor Commands, What is Info, Top +@chapter Command Line Options +@cindex command line options +@cindex arguments, command line + +GNU Info accepts several options to control the initial node being +viewed, and to specify which directories to search for Info files. Here +is a template showing an invocation of GNU Info from the shell: + +@example +info [--@var{option-name} @var{option-value}] @var{menu-item}@dots{} +@end example + +The following @var{option-names} are available when invoking Info from +the shell: + +@table @code +@cindex directory path +@item --directory @var{directory-path} +@itemx -d @var{directory-path} +Add @var{directory-path} to the list of directory paths searched when +Info needs to find a file. You may issue @code{--directory} multiple +times; once for each directory which contains Info files. +Alternatively, you may specify a value for the environment variable +@code{INFOPATH}; if @code{--directory} is not given, the value of +@code{INFOPATH} is used. The value of @code{INFOPATH} is a colon +separated list of directory names. If you do not supply @code{INFOPATH} +or @code{--directory-path}, Info uses a default path. + +@item --file @var{filename} +@itemx -f @var{filename} +@cindex Info file, selecting +Specify a particular Info file to visit. By default, Info visits +the file @code{dir}; if you use this option, Info will start with +@code{(@var{filename})Top} as the first file and node. + +@item --node @var{nodename} +@itemx -n @var{nodename} +@cindex node, selecting +Specify a particular node to visit in the initial file that Info +loads. This is especially useful in conjunction with +@code{--file}@footnote{Of course, you can specify both the file and node +in a @code{--node} command; but don't forget to escape the open and +close parentheses from the shell as in: @code{info --node +"(emacs)Buffers"}}. You may specify @code{--node} multiple times; for +an interactive Info, each @var{nodename} is visited in its own window, +for a non-interactive Info (such as when @code{--output} is given) each +@var{nodename} is processed sequentially. + +@item --output @var{filename} +@itemx -o @var{filename} +@cindex file, outputting to +@cindex outputting to a file +Specify @var{filename} as the name of a file to which to direct output. +Each node that Info visits will be output to @var{filename} instead of +interactively viewed. A value of @code{-} for @var{filename} specifies +the standard output. + +@item --subnodes +@cindex @code{--subnodes}, command line option +This option only has meaning when given in conjunction with +@code{--output}. It means to recursively output the nodes appearing in +the menus of each node being output. Menu items which resolve to +external Info files are not output, and neither are menu items which are +members of an index. Each node is only output once. + +@item --help +@itemx -h +Produces a relatively brief description of the available Info options. + +@item --version +@cindex version information +Prints the version information of Info and exits. + +@item @var{menu-item} +@cindex menu, following +Info treats its remaining arguments as the names of menu items. The +first argument is a menu item in the initial node visited, while +the second argument is a menu item in the first argument's node. +You can easily move to the node of your choice by specifying the menu +names which describe the path to that node. For example, + +@example +info emacs buffers +@end example + +@noindent +first selects the menu item @samp{Emacs} in the node @samp{(dir)Top}, +and then selects the menu item @samp{Buffers} in the node +@samp{(emacs)Top}. +@end table + +@node Cursor Commands, Scrolling Commands, Options, Top +@chapter Moving the Cursor +@cindex cursor, moving + +Many people find that reading screens of text page by page is made +easier when one is able to indicate particular pieces of text with some +kind of pointing device. Since this is the case, GNU Info (both the +Emacs and standalone versions) have several commands which allow you to +move the cursor about the screen. The notation used in this manual to +describe keystrokes is identical to the notation used within the Emacs +manual, and the GNU Readline manual. @xref{Characters, , Character +Conventions, emacs, the GNU Emacs Manual}, if you are unfamiliar with the +notation. + +The following table lists the basic cursor movement commands in Info. +Each entry consists of the key sequence you should type to execute the +cursor movement, the @code{M-x}@footnote{@code{M-x} is also a command; it +invokes @code{execute-extended-command}. @xref{M-x, , Executing an +extended command, emacs, the GNU Emacs Manual}, for more detailed +information.} command name (displayed in parentheses), and a short +description of what the command does. All of the cursor motion commands +can take an @dfn{numeric} argument (@pxref{Miscellaneous Commands, +@code{universal-argument}}), to find out how to supply them. With a +numeric argument, the motion commands are simply executed that +many times; for example, a numeric argument of 4 given to +@code{next-line} causes the cursor to move down 4 lines. With a +negative numeric argument, the motion is reversed; an argument of -4 +given to the @code{next-line} command would cause the cursor to move +@emph{up} 4 lines. + +@table @asis +@item @code{C-n} (@code{next-line}) +@kindex C-n +@findex next-line +Move the cursor down to the next line. + +@item @code{C-p} (@code{prev-line}) +@kindex C-p +@findex prev-line +Move the cursor up to the previous line. + +@item @code{C-a} (@code{beginning-of-line}) +@kindex C-a, in Info windows +@findex beginning-of-line +Move the cursor to the start of the current line. + +@item @code{C-e} (@code{end-of-line}) +@kindex C-e, in Info windows +@findex end-of-line +Move the cursor to the end of the current line. + +@item @code{C-f} (@code{forward-char}) +@kindex C-f, in Info windows +@findex forward-char +Move the cursor forward a character. + +@item @code{C-b} (@code{backward-char}) +@kindex C-b, in Info windows +@findex backward-char +Move the cursor backward a character. + +@item @code{M-f} (@code{forward-word}) +@kindex M-f, in Info windows +@findex forward-word +Move the cursor forward a word. + +@item @code{M-b} (@code{backward-word}) +@kindex M-b, in Info windows +@findex backward-word +Move the cursor backward a word. + +@item @code{M-<} (@code{beginning-of-node}) +@itemx @code{b} +@kindex b, in Info windows +@kindex M-< +@findex beginning-of-node +Move the cursor to the start of the current node. + +@item @code{M->} (@code{end-of-node}) +@kindex M-> +@findex end-of-node +Move the cursor to the end of the current node. + +@item @code{M-r} (@code{move-to-window-line}) +@kindex M-r +@findex move-to-window-line +Move the cursor to a specific line of the window. Without a numeric +argument, @code{M-r} moves the cursor to the start of the line in the +center of the window. With a numeric argument of @var{n}, @code{M-r} +moves the cursor to the start of the @var{n}th line in the window. +@end table + +@node Scrolling Commands, Node Commands, Cursor Commands, Top +@chapter Moving Text Within a Window +@cindex scrolling + +Sometimes you are looking at a screenful of text, and only part of the +current paragraph you are reading is visible on the screen. The +commands detailed in this section are used to shift which part of the +current node is visible on the screen. + +@table @asis +@item @code{SPC} (@code{scroll-forward}) +@itemx @code{C-v} +@kindex SPC, in Info windows +@kindex C-v +@findex scroll-forward +Shift the text in this window up. That is, show more of the node which +is currently below the bottom of the window. With a numeric argument, +show that many more lines at the bottom of the window; a numeric +argument of 4 would shift all of the text in the window up 4 lines +(discarding the top 4 lines), and show you four new lines at the bottom +of the window. Without a numeric argument, @key{SPC} takes the bottom +two lines of the window and places them at the top of the window, +redisplaying almost a completely new screenful of lines. + +@item @code{DEL} (@code{scroll-backward}) +@itemx @code{M-v} +@kindex DEL, in Info windows +@kindex M-v +@findex scroll-backward +Shift the text in this window down. The inverse of +@code{scroll-forward}. +@end table + +@cindex scrolling through node structure +The @code{scroll-forward} and @code{scroll-backward} commands can also +move forward and backward through the node structure of the file. If +you press @key{SPC} while viewing the end of a node, or @key{DEL} while +viewing the beginning of a node, what happens is controlled by the +variable @code{scroll-behavior}. @xref{Variables, +@code{scroll-behavior}}, for more information. + +@table @asis +@item @code{C-l} (@code{redraw-display}) +@kindex C-l +@findex redraw-display +Redraw the display from scratch, or shift the line containing the cursor +to a specified location. With no numeric argument, @samp{C-l} clears +the screen, and then redraws its entire contents. Given a numeric +argument of @var{n}, the line containing the cursor is shifted so that +it is on the @var{n}th line of the window. + +@item @code{C-x w} (@code{toggle-wrap}) +@kindex C-w +@findex toggle-wrap +Toggles the state of line wrapping in the current window. Normally, +lines which are longer than the screen width @dfn{wrap}, i.e., they are +continued on the next line. Lines which wrap have a @samp{\} appearing +in the rightmost column of the screen. You can cause such lines to be +terminated at the rightmost column by changing the state of line +wrapping in the window with @code{C-x w}. When a line which needs more +space than one screen width to display is displayed, a @samp{$} appears +in the rightmost column of the screen, and the remainder of the line is +invisible. +@end table + +@node Node Commands, Searching Commands, Scrolling Commands, Top +@chapter Selecting a New Node +@cindex nodes, selection of + +This section details the numerous Info commands which select a new node +to view in the current window. + +The most basic node commands are @samp{n}, @samp{p}, @samp{u}, and +@samp{l}. + +When you are viewing a node, the top line of the node contains some Info +@dfn{pointers} which describe where the next, previous, and up nodes +are. Info uses this line to move about the node structure of the file +when you use the following commands: + +@table @asis +@item @code{n} (@code{next-node}) +@kindex n +@findex next-node +Select the `Next' node. + +@item @code{p} (@code{prev-node}) +@kindex p +@findex prev-node +Select the `Prev' node. + +@item @code{u} (@code{up-node}) +@kindex u +@findex up-node +Select the `Up' node. +@end table + +You can easily select a node that you have already viewed in this window +by using the @samp{l} command -- this name stands for "last", and +actually moves through the list of already visited nodes for this +window. @samp{l} with a negative numeric argument moves forward through +the history of nodes for this window, so you can quickly step between +two adjacent (in viewing history) nodes. + +@table @asis +@item @code{l} (@code{history-node}) +@kindex l +@findex history-node +Select the most recently selected node in this window. +@end table + +Two additional commands make it easy to select the most commonly +selected nodes; they are @samp{t} and @samp{d}. + +@table @asis +@item @code{t} (@code{top-node}) +@kindex t +@findex top-node +Select the node @samp{Top} in the current Info file. + +@item @code{d} (@code{dir-node}) +@kindex d +@findex dir-node +Select the directory node (i.e., the node @samp{(dir)}). +@end table + +Here are some other commands which immediately result in the selection +of a different node in the current window: + +@table @asis +@item @code{<} (@code{first-node}) +@kindex < +@findex first-node +Selects the first node which appears in this file. This node is most +often @samp{Top}, but it does not have to be. + +@item @code{>} (@code{last-node}) +@kindex > +@findex last-node +Select the last node which appears in this file. + +@item @code{]} (@code{global-next-node}) +@kindex ] +@findex global-next-node +Move forward or down through node structure. If the node that you are +currently viewing has a @samp{Next} pointer, that node is selected. +Otherwise, if this node has a menu, the first menu item is selected. If +there is no @samp{Next} and no menu, the same process is tried with the +@samp{Up} node of this node. + +@item @code{[} (@code{global-prev-node}) +@kindex [ +@findex global-prev-node +Move backward or up through node structure. If the node that you are +currently viewing has a @samp{Prev} pointer, that node is selected. +Otherwise, if the node has an @samp{Up} pointer, that node is selected, +and if it has a menu, the last item in the menu is selected. +@end table + +You can get the same behavior as @code{global-next-node} and +@code{global-prev-node} while simply scrolling through the file with +@key{SPC} and @key{DEL}; @xref{Variables, @code{scroll-behavior}}, for +more information. + +@table @asis +@item @code{g} (@code{goto-node}) +@kindex g +@findex goto-node +Read the name of a node and select it. No completion is done while +reading the node name, since the desired node may reside in a separate +file. The node must be typed exactly as it appears in the Info file. A +file name may be included as with any node specification, for example + +@example +@code{g(emacs)Buffers} +@end example + +finds the node @samp{Buffers} in the Info file @file{emacs}. + +@item @code{C-x k} (@code{kill-node}) +@kindex C-x k +@findex kill-node +Kill a node. The node name is prompted for in the echo area, with a +default of the current node. @dfn{Killing} a node means that Info tries +hard to forget about it, removing it from the list of history nodes kept +for the window where that node is found. Another node is selected in +the window which contained the killed node. + +@item @code{C-x C-f} (@code{view-file}) +@kindex C-x C-f +@findex view-file +Read the name of a file and selects the entire file. The command +@example +@code{C-x C-f @var{filename}} +@end example +is equivalent to typing +@example +@code{g(@var{filename})*} +@end example + +@item @code{C-x C-b} (@code{list-visited-nodes}) +@kindex C-x C-b +@findex list-visited-nodes +Make a window containing a menu of all of the currently visited nodes. +This window becomes the selected window, and you may use the standard +Info commands within it. + +@item @code{C-x b} (@code{select-visited-node}) +@kindex C-x b +@findex select-visited-node +Select a node which has been previously visited in a visible window. +This is similar to @samp{C-x C-b} followed by @samp{m}, but no window is +created. +@end table + +@node Searching Commands, Xref Commands, Node Commands, Top +@chapter Searching an Info File +@cindex searching + +GNU Info allows you to search for a sequence of characters throughout an +entire Info file, search through the indices of an Info file, or find +areas within an Info file which discuss a particular topic. + +@table @asis +@item @code{s} (@code{search}) +@kindex s +@findex search +Read a string in the echo area and search for it. + +@item @code{C-s} (@code{isearch-forward}) +@kindex C-s +@findex isearch-forward +Interactively search forward through the Info file for a string as you +type it. + +@item @code{C-r} (@code{isearch-backward}) +@kindex C-r +@findex isearch-backward +Interactively search backward through the Info file for a string as +you type it. + +@item @code{i} (@code{index-search}) +@kindex i +@findex index-search +Look up a string in the indices for this Info file, and select a node +where the found index entry points to. + +@item @code{,} (@code{next-index-match}) +@kindex , +@findex next-index-match +Move to the node containing the next matching index item from the last +@samp{i} command. +@end table + +The most basic searching command is @samp{s} (@code{search}). The +@samp{s} command prompts you for a string in the echo area, and then +searches the remainder of the Info file for an occurrence of that string. +If the string is found, the node containing it is selected, and the +cursor is left positioned at the start of the found string. Subsequent +@samp{s} commands show you the default search string within @samp{[} and +@samp{]}; pressing @key{RET} instead of typing a new string will use the +default search string. + +@dfn{Incremental searching} is similar to basic searching, but the +string is looked up while you are typing it, instead of waiting until +the entire search string has been specified. + +@node Xref Commands, Window Commands, Searching Commands, Top +@chapter Selecting Cross References + +We have already discussed the @samp{Next}, @samp{Prev}, and @samp{Up} +pointers which appear at the top of a node. In addition to these +pointers, a node may contain other pointers which refer you to a +different node, perhaps in another Info file. Such pointers are called +@dfn{cross references}, or @dfn{xrefs} for short. + +@menu +* Parts of an Xref:: What a cross reference is made of. +* Selecting Xrefs:: Commands for selecting menu or note items. +@end menu + +@node Parts of an Xref, Selecting Xrefs, , Xref Commands +@section Parts of an Xref + +Cross references have two major parts: the first part is called the +@dfn{label}; it is the name that you can use to refer to the cross +reference, and the second is the @dfn{target}; it is the full name of +the node that the cross reference points to. + +The target is separated from the label by a colon @samp{:}; first the +label appears, and then the target. For example, in the sample menu +cross reference below, the single colon separates the label from the +target. + +@example +* Foo Label: Foo Target. More information about Foo. +@end example + +Note the @samp{.} which ends the name of the target. The @samp{.} is +not part of the target; it serves only to let Info know where the target +name ends. + +A shorthand way of specifying references allows two adjacent colons to +stand for a target name which is the same as the label name: + +@example +* Foo Commands:: Commands pertaining to Foo. +@end example + +In the above example, the name of the target is the same as the name of +the label, in this case @code{Foo Commands}. + +You will normally see two types of cross reference while viewing nodes: +@dfn{menu} references, and @dfn{note} references. Menu references +appear within a node's menu; they begin with a @samp{*} at the beginning +of a line, and continue with a label, a target, and a comment which +describes what the contents of the node pointed to contains. + +Note references appear within the body of the node text; they begin with +@code{*Note}, and continue with a label and a target. + +Like @samp{Next}, @samp{Prev}, and @samp{Up} pointers, cross references +can point to any valid node. They are used to refer you to a place +where more detailed information can be found on a particular subject. +Here is a cross reference which points to a node within the Texinfo +documentation: @xref{xref, , Writing an Xref, texinfo, the Texinfo +Manual}, for more information on creating your own texinfo cross +references. + +@node Selecting Xrefs, , Parts of an Xref, Xref Commands +@section Selecting Xrefs + +The following table lists the Info commands which operate on menu items. + +@table @asis +@item @code{1} (@code{menu-digit}) +@itemx @code{2} @dots{} @code{9} +@cindex 1 @dots{} 9, in Info windows +@kindex 1 @dots{} 9, in Info windows +@findex menu-digit +Within an Info window, pressing a single digit, (such as @samp{1}), +selects that menu item, and places its node in the current window. +For convenience, there is one exception; pressing @samp{0} selects the +@emph{last} item in the node's menu. + +@item @code{0} (@code{last-menu-item}) +@kindex 0, in Info windows +@findex last-menu-item +Select the last item in the current node's menu. + +@item @code{m} (@code{menu-item}) +@kindex m +@findex menu-item +Reads the name of a menu item in the echo area and selects its node. +Completion is available while reading the menu label. + +@item @code{M-x find-menu} +@findex find-menu +Move the cursor to the start of this node's menu. +@end table + +This table lists the Info commands which operate on note cross references. + +@table @asis +@item @code{f} (@code{xref-item}) +@itemx @code{r} +@kindex f +@kindex r +@findex xref-item +Reads the name of a note cross reference in the echo area and selects +its node. Completion is available while reading the cross reference +label. +@end table + +Finally, the next few commands operate on menu or note references alike: + +@table @asis +@item @code{TAB} (@code{move-to-next-xref}) +@kindex TAB, in Info windows +@findex move-to-next-xref +Move the cursor to the start of the next nearest menu item or note +reference in this node. You can then use @key{RET} +(@code{select-reference-this-line}) to select the menu or note reference. + +@item @code{M-TAB} (@code{move-to-prev-xref}) +@kindex M-TAB, in Info windows +@findex move-to-prev-xref +Move the cursor the start of the nearest previous menu item or note +reference in this node. + +@item @code{RET} (@code{select-reference-this-line}) +@kindex RET, in Info windows +@findex select-reference-this-line +Select the menu item or note reference appearing on this line. +@end table + +@node Window Commands, Printing Nodes, Xref Commands, Top +@chapter Manipulating Multiple Windows +@cindex windows, manipulating + +A @dfn{window} is a place to show the text of a node. Windows have a +view area where the text of the node is displayed, and an associated +@dfn{mode line}, which briefly describes the node being viewed. + +GNU Info supports multiple windows appearing in a single screen; each +window is separated from the next by its modeline. At any time, there +is only one @dfn{active} window, that is, the window in which the cursor +appears. There are commands available for creating windows, changing +the size of windows, selecting which window is active, and for deleting +windows. + +@menu +* The Mode Line:: What appears in the mode line? +* Basic Windows:: Manipulating windows in Info. +* The Echo Area:: Used for displaying errors and reading input. +@end menu + +@node The Mode Line, Basic Windows, , Window Commands +@section The Mode Line + +A @dfn{mode line} is a line of inverse video which appears at the bottom +of an Info window. It describes the contents of the window just above +it; this information includes the name of the file and node appearing in +that window, the number of screen lines it takes to display the node, +and the percentage of text that is above the top of the window. It can +also tell you if the indirect tags table for this Info file needs to be +updated, and whether or not the Info file was compressed when stored on +disk. + +Here is a sample mode line for a window containing an uncompressed file +named @file{dir}, showing the node @samp{Top}. + +@example +@group +-----Info: (dir)Top, 40 lines --Top--------------------------------------- + ^^ ^ ^^^ ^^ + (file)Node #lines where +@end group +@end example + +When a node comes from a file which is compressed on disk, this is +indicated in the mode line with two small @samp{z}'s. In addition, if +the Info file containing the node has been split into subfiles, the name +of the subfile containing the node appears in the modeline as well: + +@example +--zz-Info: (emacs)Top, 291 lines --Top-- Subfile: emacs-1.Z--------------- +@end example + +When Info makes a node internally, such that there is no corresponding +info file on disk, the name of the node is surrounded by asterisks +(@samp{*}). The name itself tells you what the contents of the window +are; the sample mode line below shows an internally constructed node +showing possible completions: + +@example +-----Info: *Completions*, 7 lines --All----------------------------------- +@end example + +@node Basic Windows, The Echo Area, The Mode Line, Window Commands +@section Window Commands + +It can be convenient to view more than one node at a time. To allow +this, Info can display more than one @dfn{window}. Each window has its +own mode line (@pxref{The Mode Line}) and history of nodes viewed in that +window (@pxref{Node Commands, , @code{history-node}}). + +@table @asis +@item @code{C-x o} (@code{next-window}) +@cindex windows, selecting +@kindex C-x o +@findex next-window +Select the next window on the screen. Note that the echo area can only be +selected if it is already in use, and you have left it temporarily. +Normally, @samp{C-x o} simply moves the cursor into the next window on +the screen, or if you are already within the last window, into the first +window on the screen. Given a numeric argument, @samp{C-x o} moves over +that many windows. A negative argument causes @samp{C-x o} to select +the previous window on the screen. + +@item @code{M-x prev-window} +@findex prev-window +Select the previous window on the screen. This is identical to +@samp{C-x o} with a negative argument. + +@item @code{C-x 2} (@code{split-window}) +@cindex windows, creating +@kindex C-x 2 +@findex split-window +Split the current window into two windows, both showing the same node. +Each window is one half the size of the original window, and the cursor +remains in the original window. The variable @code{automatic-tiling} +can cause all of the windows on the screen to be resized for you +automatically, please @pxref{Variables, , automatic-tiling} for more +information. + +@item @code{C-x 0} (@code{delete-window}) +@cindex windows, deleting +@kindex C-x 0 +@findex delete-window +Delete the current window from the screen. If you have made too many +windows and your screen appears cluttered, this is the way to get rid of +some of them. + +@item @code{C-x 1} (@code{keep-one-window}) +@kindex C-x 1 +@findex keep-one-window +Delete all of the windows excepting the current one. + +@item @code{ESC C-v} (@code{scroll-other-window}) +@kindex ESC C-v, in Info windows +@findex scroll-other-window +Scroll the other window, in the same fashion that @samp{C-v} might +scroll the current window. Given a negative argument, scroll the +"other" window backward. + +@item @code{C-x ^} (@code{grow-window}) +@kindex C-x ^ +@findex grow-window +Grow (or shrink) the current window. Given a numeric argument, grow +the current window that many lines; with a negative numeric argument, +shrink the window instead. + +@item @code{C-x t} (@code{tile-windows}) +@cindex tiling +@kindex C-x t +@findex tile-windows +Divide the available screen space among all of the visible windows. +Each window is given an equal portion of the screen in which to display +its contents. The variable @code{automatic-tiling} can cause +@code{tile-windows} to be called when a window is created or deleted. +@xref{Variables, , @code{automatic-tiling}}. +@end table + +@node The Echo Area, , Basic Windows, Window Commands +@section The Echo Area +@cindex echo area + +The @dfn{echo area} is a one line window which appears at the bottom of +the screen. It is used to display informative or error messages, and to +read lines of input from you when that is necessary. Almost all of the +commands available in the echo area are identical to their Emacs +counterparts, so please refer to that documentation for greater depth of +discussion on the concepts of editing a line of text. The following +table briefly lists the commands that are available while input is being +read in the echo area: + +@table @asis +@item @code{C-f} (@code{echo-area-forward}) +@kindex C-f, in the echo area +@findex echo-area-forward +Move forward a character. + +@item @code{C-b} (@code{echo-area-backward}) +@kindex C-b, in the echo area +@findex echo-area-backward +Move backward a character. + +@item @code{C-a} (@code{echo-area-beg-of-line}) +@kindex C-a, in the echo area +@findex echo-area-beg-of-line +Move to the start of the input line. + +@item @code{C-e} (@code{echo-area-end-of-line}) +@kindex C-e, in the echo area +@findex echo-area-end-of-line +Move to the end of the input line. + +@item @code{M-f} (@code{echo-area-forward-word}) +@kindex M-f, in the echo area +@findex echo-area-forward-word +Move forward a word. + +@item @code{M-b} (@code{echo-area-backward-word}) +@kindex M-b, in the echo area +@findex echo-area-backward-word +Move backward a word. + +@item @code{C-d} (@code{echo-area-delete}) +@kindex C-d, in the echo area +@findex echo-area-delete +Delete the character under the cursor. + +@item @code{DEL} (@code{echo-area-rubout}) +@kindex DEL, in the echo area +@findex echo-area-rubout +Delete the character behind the cursor. + +@item @code{C-g} (@code{echo-area-abort}) +@kindex C-g, in the echo area +@findex echo-area-abort +Cancel or quit the current operation. If completion is being read, +@samp{C-g} discards the text of the input line which does not match any +completion. If the input line is empty, @samp{C-g} aborts the calling +function. + +@item @code{RET} (@code{echo-area-newline}) +@kindex RET, in the echo area +@findex echo-area-newline +Accept (or forces completion of) the current input line. + +@item @code{C-q} (@code{echo-area-quoted-insert}) +@kindex C-q, in the echo area +@findex echo-area-quoted-insert +Insert the next character verbatim. This is how you can insert control +characters into a search string, for example. + +@item @var{printing character} (@code{echo-area-insert}) +@kindex printing characters, in the echo area +@findex echo-area-insert +Insert the character. + +@item @code{M-TAB} (@code{echo-area-tab-insert}) +@kindex M-TAB, in the echo area +@findex echo-area-tab-insert +Insert a TAB character. + +@item @code{C-t} (@code{echo-area-transpose-chars}) +@kindex C-t, in the echo area +@findex echo-area-transpose-chars +Transpose the characters at the cursor. +@end table + +The next group of commands deal with @dfn{killing}, and @dfn{yanking} +text. For an in depth discussion of killing and yanking, +@pxref{Killing, , Killing and Deleting, emacs, the GNU Emacs Manual} + +@table @asis +@item @code{M-d} (@code{echo-area-kill-word}) +@kindex M-d, in the echo area +@findex echo-area-kill-word +Kill the word following the cursor. + +@item @code{M-DEL} (@code{echo-area-backward-kill-word}) +@kindex M-DEL, in the echo area +@findex echo-area-backward-kill-word +Kill the word preceding the cursor. + +@item @code{C-k} (@code{echo-area-kill-line}) +@kindex C-k, in the echo area +@findex echo-area-kill-line +Kill the text from the cursor to the end of the line. + +@item @code{C-x DEL} (@code{echo-area-backward-kill-line}) +@kindex C-x DEL, in the echo area +@findex echo-area-backward-kill-line +Kill the text from the cursor to the beginning of the line. + +@item @code{C-y} (@code{echo-area-yank}) +@kindex C-y, in the echo area +@findex echo-area-yank +Yank back the contents of the last kill. + +@item @code{M-y} (@code{echo-area-yank-pop}) +@kindex M-y, in the echo area +@findex echo-area-yank-pop +Yank back a previous kill, removing the last yanked text first. +@end table + +Sometimes when reading input in the echo area, the command that needed +input will only accept one of a list of several choices. The choices +represent the @dfn{possible completions}, and you must respond with one +of them. Since there are a limited number of responses you can make, +Info allows you to abbreviate what you type, only typing as much of the +response as is necessary to uniquely identify it. In addition, you can +request Info to fill in as much of the response as is possible; this +is called @dfn{completion}. + +The following commands are available when completing in the echo area: + +@table @asis +@item @code{TAB} (@code{echo-area-complete}) +@itemx @code{SPC} +@kindex TAB, in the echo area +@kindex SPC, in the echo area +@findex echo-area-complete +Insert as much of a completion as is possible. + +@item @code{?} (@code{echo-area-possible-completions}) +@kindex ?, in the echo area +@findex echo-area-possible-completions +Display a window containing a list of the possible completions of what +you have typed so far. For example, if the available choices are: + +@example +@group +bar +foliate +food +forget +@end group +@end example + +@noindent +and you have typed an @samp{f}, followed by @samp{?}, the possible +completions would contain: + +@example +@group +foliate +food +forget +@end group +@end example + +@noindent +i.e., all of the choices which begin with @samp{f}. Pressing @key{SPC} +or @key{TAB} would result in @samp{fo} appearing in the echo area, since +all of the choices which begin with @samp{f} continue with @samp{o}. +Now, typing @samp{l} followed by @samp{TAB} results in @samp{foliate} +appearing in the echo area, since that is the only choice which begins +with @samp{fol}. + +@item @code{ESC C-v} (@code{echo-area-scroll-completions-window}) +@kindex ESC C-v, in the echo area +@findex echo-area-scroll-completions-window +Scroll the completions window, if that is visible, or the "other" +window if not. +@end table + +@node Printing Nodes, Miscellaneous Commands, Window Commands, Top +@chapter Printing Out Nodes +@cindex printing + +You may wish to print out the contents of a node as a quick reference +document for later use. Info provides you with a command for doing +this. In general, we recommend that you use @TeX{} to format the +document and print sections of it, by running @code{tex} on the Texinfo +source file. + +@table @asis +@item @code{M-x print-node} +@findex print-node +@cindex INFO_PRINT_COMMAND, environment variable +Pipe the contents of the current node through the command in the +environment variable @code{INFO_PRINT_COMMAND}. If the variable does not +exist, the node is simply piped to @code{lpr}. +@end table + +@node Miscellaneous Commands, Variables, Printing Nodes, Top +@chapter Miscellaneous Commands + +GNU Info contains several commands which self-document GNU Info: + +@table @asis +@item @code{M-x describe-command} +@cindex functions, describing +@cindex commands, describing +@findex describe-command +Read the name of an Info command in the echo area and then display a +brief description of what that command does. + +@item @code{M-x describe-key} +@cindex keys, describing +@findex describe-key +Read a key sequence in the echo area, and then display the name and +documentation of the Info command that the key sequence invokes. + +@item @code{M-x describe-variable} +Read the name of a variable in the echo area and then display a brief +description of what the variable affects. + +@item @code{M-x where-is} +@findex where-is +Read the name of an Info command in the echo area, and then display +a key sequence which can be typed in order to invoke that command. + +@item @code{C-h} (@code{get-help-window}) +@itemx @code{?} +@kindex C-h +@kindex ?, in Info windows +@findex get-help-window +Create (or Move into) the window displaying @code{*Help*}, and place +a node containing a quick reference card into it. This window displays +the most concise information about GNU Info available. + +@item @code{h} (@code{get-info-help-node}) +@kindex h +@findex get-info-help-node +Try hard to visit the node @code{(info)Help}. The Info file +@file{info.texi} distributed with GNU Info contains this node. Of +course, the file must first be processed with @code{makeinfo}, and then +placed into the location of your Info directory. +@end table + +Here are the commands for creating a numeric argument: + +@table @asis +@item @code{C-u} (@code{universal-argument}) +@cindex numeric arguments +@kindex C-u +@findex universal-argument +Start (or multiply by 4) the current numeric argument. @samp{C-u} is +a good way to give a small numeric argument to cursor movement or +scrolling commands; @samp{C-u C-v} scrolls the screen 4 lines, while +@samp{C-u C-u C-n} moves the cursor down 16 lines. + +@item @code{M-1} (@code{add-digit-to-numeric-arg}) +@itemx @code{M-2} @dots{} @code{M-9} +@kindex M-1 @dots{} M-9 +@findex add-digit-to-numeric-arg +Add the digit value of the invoking key to the current numeric +argument. Once Info is reading a numeric argument, you may just type +the digits of the argument, without the Meta prefix. For example, you +might give @samp{C-l} a numeric argument of 32 by typing: + +@example +@kbd{C-u 3 2 C-l} +@end example + +@noindent +or + +@example +@kbd{M-3 2 C-l} +@end example +@end table + +@samp{C-g} is used to abort the reading of a multi-character key +sequence, to cancel lengthy operations (such as multi-file searches) and +to cancel reading input in the echo area. + +@table @asis +@item @code{C-g} (@code{abort-key}) +@cindex cancelling typeahead +@cindex cancelling the current operation +@kindex C-g, in Info windows +@findex abort-key +Cancel current operation. +@end table + +The @samp{q} command of Info simply quits running Info. + +@table @asis +@item @code{q} (@code{quit}) +@cindex quitting +@kindex q +@findex quit +Exit GNU Info. +@end table + +If the operating system tells GNU Info that the screen is 60 lines tall, +and it is actually only 40 lines tall, here is a way to tell Info that +the operating system is correct. + +@table @asis +@item @code{M-x set-screen-height} +@findex set-screen-height +@cindex screen, changing the height of +Read a height value in the echo area and set the height of the +displayed screen to that value. +@end table + +Finally, Info provides a convenient way to display footnotes which might +be associated with the current node that you are viewing: + +@table @asis +@item @code{ESC C-f} (@code{show-footnotes}) +@kindex ESC C-f +@findex show-footnotes +@cindex footnotes, displaying +Show the footnotes (if any) associated with the current node in another +window. You can have Info automatically display the footnotes +associated with a node when the node is selected by setting the variable +@code{automatic-footnotes}. @xref{Variables, , @code{automatic-footnotes}}. +@end table + +@node Variables, GNU Info Global Index, Miscellaneous Commands, Top +@chapter Manipulating Variables + +GNU Info contains several @dfn{variables} whose values are looked at by +various Info commands. You can change the values of these variables, +and thus change the behavior of Info to more closely match your +environment and Info file reading manner. + +@table @asis +@item @code{M-x set-variable} +@cindex variables, setting +@findex set-variable +Read the name of a variable, and the value for it, in the echo area and +then set the variable to that value. Completion is available when +reading the variable name; often, completion is available when reading +the value to give to the variable, but that depends on the variable +itself. If a variable does @emph{not} supply multiple choices to +complete over, it expects a numeric value. + +@item @code{M-x describe-variable} +@cindex variables, describing +@findex describe-variable +Read the name of a variable in the echo area and then display a brief +description of what the variable affects. +@end table + +Here is a list of the variables that you can set in Info. + +@table @code +@item automatic-footnotes +@vindex automatic-footnotes +When set to @code{On}, footnotes appear and disappear automatically. +This variable is @code{On} by default. When a node is selected, a +window containing the footnotes which appear in that node is created, +and the footnotes are displayed within the new window. The window that +Info creates to contain the footnotes is called @samp{*Footnotes*}. If +a node is selected which contains no footnotes, and a @samp{*Footnotes*} +window is on the screen, the @samp{*Footnotes*} window is deleted. +Footnote windows created in this fashion are not automatically tiled so +that they can use as little of the display as is possible. + +@item automatic-tiling +@vindex automatic-tiling +When set to @code{On}, creating or deleting a window resizes other +windows. This variable is @code{Off} by default. Normally, typing +@samp{C-x 2} divides the current window into two equal parts. When +@code{automatic-tiling} is set to @code{On}, all of the windows are +resized automatically, keeping an equal number of lines visible in each +window. There are exceptions to the automatic tiling; specifically, the +windows @samp{*Completions*} and @samp{*Footnotes*} are @emph{not} +resized through automatic tiling; they remain their original size. + +@item visible-bell +@vindex visible-bell +When set to @code{On}, GNU Info attempts to flash the screen instead of +ringing the bell. This variable is @code{Off} by default. Of course, +Info can only flash the screen if the terminal allows it; in the case +that the terminal does not allow it, the setting of this variable has no +effect. However, you can make Info perform quietly by setting the +@code{errors-ring-bell} variable to @code{Off}. + +@item errors-ring-bell +@vindex errors-ring-bell +When set to @code{On}, errors cause the bell to ring. The default +setting of this variable is @code{On}. + +@item gc-compressed-files +@vindex gc-compressed-files +When set to @code{On}, Info garbage collects files which had to be +uncompressed. The default value of this variable is @code{Off}. +Whenever a node is visited in Info, the Info file containing that node +is read into core, and Info reads information about the tags and nodes +contained in that file. Once the tags information is read by Info, it +is never forgotten. However, the actual text of the nodes does not need +to remain in core unless a particular Info window needs it. For +non-compressed files, the text of the nodes does not remain in core when +it is no longer in use. But de-compressing a file can be a time +consuming operation, and so Info tries hard not to do it twice. +@code{gc-compressed-files} tells Info it is okay to garbage collect the +text of the nodes of a file which was compressed on disk. + +@item show-index-match +@vindex show-index-match +When set to @code{On}, the portion of the matched search string is +highlighted in the message which explains where the matched search +string was found. The default value of this variable is @code{On}. +When Info displays the location where an index match was found, +(@pxref{Searching Commands, , @code{next-index-match}}), the portion of the +string that you had typed is highlighted by displaying it in the inverse +case from its surrounding characters. + +@item scroll-behavior +@vindex scroll-behavior +Control what happens when forward scrolling is requested at the end of +a node, or when backward scrolling is requested at the beginning of a +node. The default value for this variable is @code{Continuous}. There +are three possible values for this variable: + +@table @code +@item Continuous +Try to get the first item in this node's menu, or failing that, the +@samp{Next} node, or failing that, the @samp{Next} of the @samp{Up}. +This behavior is identical to using the @samp{]} +(@code{global-next-node}) and @samp{[} (@code{global-prev-node}) +commands. + +@item Next Only +Only try to get the @samp{Next} node. + +@item Page Only +Simply give up, changing nothing. If @code{scroll-behavior} is +@code{Page Only}, no scrolling command can change the node that is being +viewed. +@end table + +@item scroll-step +@vindex scroll-step +The number of lines to scroll when the cursor moves out of the window. +Scrolling happens automatically if the cursor has moved out of the +visible portion of the node text when it is time to display. Usually +the scrolling is done so as to put the cursor on the center line of the +current window. However, if the variable @code{scroll-step} has a +nonzero value, Info attempts to scroll the node text by that many lines; +if that is enough to bring the cursor back into the window, that is what +is done. The default value of this variable is 0, thus placing the +cursor (and the text it is attached to) in the center of the window. +Setting this variable to 1 causes a kind of "smooth scrolling" which +some people prefer. + +@item ISO-Latin +@cindex ISO Latin characters +@vindex ISO-Latin +When set to @code{On}, Info accepts and displays ISO Latin characters. +By default, Info assumes an ASCII character set. @code{ISO-Latin} tells +Info that it is running in an environment where the European standard +character set is in use, and allows you to input such characters to +Info, as well as display them. +@end table + + + +@c the following is incomplete +@ignore +@c node Info for Sys Admins +@c chapter Info for System Administrators + +This text describes some common ways of setting up an Info hierarchy +from scratch, and details the various options that are available when +installing Info. This text is designed for the person who is installing +GNU Info on the system; although users may find the information present +in this section interesting, none of it is vital to understanding how to +use GNU Info. + +@menu +* Setting the INFOPATH:: Where are my Info files kept? +* Editing the DIR node:: What goes in `DIR', and why? +* Storing Info files:: Alternate formats allow flexibility in setups. +* Using `localdir':: Building DIR on the fly. +* Example setups:: Some common ways to organize Info files. +@end menu + +@c node Setting the INFOPATH +@c section Setting the INFOPATH + +Where are my Info files kept? + +@c node Editing the DIR node +@c section Editing the DIR node + +What goes in `DIR', and why? + +@c node Storing Info files +@c section Storing Info files + +Alternate formats allow flexibility in setups. + +@c node Using `localdir' +@c section Using `localdir' + +Building DIR on the fly. + +@c node Example setups +@c section Example setups + +Some common ways to organize Info files. +@end ignore + +@node GNU Info Global Index, , Variables, Top +@appendix Global Index + +@printindex cp + +@contents +@bye
new file mode 100644 --- /dev/null +++ b/info/info-utils.c @@ -0,0 +1,672 @@ +/* info-utils.c -- Useful functions for manipulating Info file quirks. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include <stdio.h> /* For "NULL". Yechhh! */ +#include <ctype.h> +#include <sys/types.h> +#include <sys/stat.h> +#if defined (HAVE_STRING_H) +# include <string.h> +#endif /* HAVE_STRING_H */ +#include "info-utils.h" + +#if defined (HANDLE_MAN_PAGES) +# include "man.h" +#endif /* HANDLE_MAN_PAGES */ + +/* When non-zero, various display and input functions handle ISO Latin + character sets correctly. */ +int ISO_Latin_p = 0; + +/* Variable which holds the most recent filename parsed as a result of + calling info_parse_xxx (). */ +char *info_parsed_filename = (char *)NULL; + +/* Variable which holds the most recent nodename parsed as a result of + calling info_parse_xxx (). */ +char *info_parsed_nodename = (char *)NULL; + +/* Functions to remember a filename or nodename for later return. */ +static void save_filename (), saven_filename (); +static void save_nodename (), saven_nodename (); + +/* How to get a reference (either menu or cross). */ +static REFERENCE **info_references_internal (); + +/* Parse the filename and nodename out of STRING. If STRING doesn't + contain a filename (i.e., it is NOT (FILENAME)NODENAME) then set + INFO_PARSED_FILENAME to NULL. If second argument NEWLINES_OKAY is + non-zero, it says to allow the nodename specification to cross a + newline boundary (i.e., only `,', `.', or `TAB' can end the spec). */ +void +info_parse_node (string, newlines_okay) + char *string; + int newlines_okay; +{ + register int i = 0; + + /* Default the answer. */ + save_filename ((char *)NULL); + save_nodename ((char *)NULL); + + /* Special case of nothing passed. Return nothing. */ + if (!string || !*string) + return; + + string += skip_whitespace (string); + + /* Check for (FILENAME)NODENAME. */ + if (*string == '(') + { + i = 0; + /* Advance past the opening paren. */ + string++; + + /* Find the closing paren. */ + while (string[i] && string[i] != ')') + i++; + + /* Remember parsed filename. */ + saven_filename (string, i); + + /* Point directly at the nodename. */ + string += i; + + if (*string) + string++; + } + + /* Parse out nodename. */ + i = skip_node_characters (string, newlines_okay); + saven_nodename (string, i); + canonicalize_whitespace (info_parsed_nodename); + if (info_parsed_nodename && !*info_parsed_nodename) + { + free (info_parsed_nodename); + info_parsed_nodename = (char *)NULL; + } +} + +/* Return the node addressed by LABEL in NODE (usually one of "Prev:", + "Next:", "Up:", "File:", or "Node:". After a call to this function, + the global INFO_PARSED_NODENAME and INFO_PARSED_FILENAME contain + the information. */ +void +info_parse_label (label, node) + char *label; + NODE *node; +{ + register int i; + char *nodeline; + + /* Default answer to failure. */ + save_nodename ((char *)NULL); + save_filename ((char *)NULL); + + /* Find the label in the first line of this node. */ + nodeline = node->contents; + i = string_in_line (label, nodeline); + + if (i == -1) + return; + + nodeline += i; + nodeline += skip_whitespace (nodeline); + info_parse_node (nodeline, DONT_SKIP_NEWLINES); +} + +/* **************************************************************** */ +/* */ +/* Finding and Building Menus */ +/* */ +/* **************************************************************** */ + +/* Return a NULL terminated array of REFERENCE * which represents the menu + found in NODE. If there is no menu in NODE, just return a NULL pointer. */ +REFERENCE ** +info_menu_of_node (node) + NODE *node; +{ + long position; + SEARCH_BINDING search; + REFERENCE **menu = (REFERENCE **)NULL; + + search.buffer = node->contents; + search.start = 0; + search.end = node->nodelen; + search.flags = S_FoldCase; + + /* Find the start of the menu. */ + position = search_forward (INFO_MENU_LABEL, &search); + + if (position == -1) + return ((REFERENCE **) NULL); + + /* We have the start of the menu now. Glean menu items from the rest + of the node. */ + search.start = position + strlen (INFO_MENU_LABEL); + search.start += skip_line (search.buffer + search.start); + search.start--; + menu = info_menu_items (&search); + return (menu); +} + +/* Return a NULL terminated array of REFERENCE * which represents the cross + refrences found in NODE. If there are no cross references in NODE, just + return a NULL pointer. */ +REFERENCE ** +info_xrefs_of_node (node) + NODE *node; +{ + SEARCH_BINDING search; + +#if defined (HANDLE_MAN_PAGES) + if (node->flags & N_IsManPage) + return (xrefs_of_manpage (node)); +#endif + + search.buffer = node->contents; + search.start = 0; + search.end = node->nodelen; + search.flags = S_FoldCase; + + return (info_xrefs (&search)); +} + +/* Glean menu entries from BINDING->buffer + BINDING->start until we + have looked at the entire contents of BINDING. Return an array + of REFERENCE * that represents each menu item in this range. */ +REFERENCE ** +info_menu_items (binding) + SEARCH_BINDING *binding; +{ + return (info_references_internal (INFO_MENU_ENTRY_LABEL, binding)); +} + +/* Glean cross references from BINDING->buffer + BINDING->start until + BINDING->end. Return an array of REFERENCE * that represents each + cross reference in this range. */ +REFERENCE ** +info_xrefs (binding) + SEARCH_BINDING *binding; +{ + return (info_references_internal (INFO_XREF_LABEL, binding)); +} + +/* Glean cross references or menu items from BINDING. Return an array + of REFERENCE * that represents the items found. */ +static REFERENCE ** +info_references_internal (label, binding) + char *label; + SEARCH_BINDING *binding; +{ + SEARCH_BINDING search; + REFERENCE **refs = (REFERENCE **)NULL; + int refs_index = 0, refs_slots = 0; + int searching_for_menu_items = 0; + long position; + + search.buffer = binding->buffer; + search.start = binding->start; + search.end = binding->end; + search.flags = S_FoldCase | S_SkipDest; + + searching_for_menu_items = (strcasecmp (label, INFO_MENU_ENTRY_LABEL) == 0); + + while ((position = search_forward (label, &search)) != -1) + { + int offset, start; + char *refdef; + REFERENCE *entry; + + search.start = position; + search.start += skip_whitespace (search.buffer + search.start); + start = search.start - binding->start; + refdef = search.buffer + search.start; + offset = string_in_line (":", refdef); + + /* When searching for menu items, if no colon, there is no + menu item on this line. */ + if (offset == -1) + { + if (searching_for_menu_items) + continue; + else + { + int temp; + + temp = skip_line (refdef); + offset = string_in_line (":", refdef + temp); + if (offset == -1) + continue; /* Give up? */ + else + offset += temp; + } + } + + entry = (REFERENCE *)xmalloc (sizeof (REFERENCE)); + entry->filename = (char *)NULL; + entry->nodename = (char *)NULL; + entry->label = (char *)xmalloc (offset); + strncpy (entry->label, refdef, offset - 1); + entry->label[offset - 1] = '\0'; + canonicalize_whitespace (entry->label); + + refdef += offset; + entry->start = start; + entry->end = refdef - binding->buffer; + + /* If this reference entry continues with another ':' then the + nodename is the same as the label. */ + if (*refdef == ':') + { + entry->nodename = strdup (entry->label); + } + else + { + /* This entry continues with a specific nodename. Parse the + nodename from the specification. */ + + refdef += skip_whitespace_and_newlines (refdef); + + if (searching_for_menu_items) + info_parse_node (refdef, DONT_SKIP_NEWLINES); + else + info_parse_node (refdef, SKIP_NEWLINES); + + if (info_parsed_filename) + entry->filename = strdup (info_parsed_filename); + + if (info_parsed_nodename) + entry->nodename = strdup (info_parsed_nodename); + } + + add_pointer_to_array + (entry, refs_index, refs, refs_slots, 50, REFERENCE *); + } + return (refs); +} + +/* Get the entry associated with LABEL in MENU. Return a pointer to the + REFERENCE if found, or NULL. */ +REFERENCE * +info_get_labeled_reference (label, references) + char *label; + REFERENCE **references; +{ + register int i; + REFERENCE *entry; + + for (i = 0; references && (entry = references[i]); i++) + { + if (strcmp (label, entry->label) == 0) + return (entry); + } + return ((REFERENCE *)NULL); +} + +/* A utility function for concatenating REFERENCE **. Returns a new + REFERENCE ** which is the concatenation of REF1 and REF2. The REF1 + and REF2 arrays are freed, but their contents are not. */ +REFERENCE ** +info_concatenate_references (ref1, ref2) + REFERENCE **ref1, **ref2; +{ + register int i, j; + REFERENCE **result; + int size; + + /* With one argument passed as NULL, simply return the other arg. */ + if (!ref1) + return (ref2); + else if (!ref2) + return (ref1); + + /* Get the total size of the slots that we will need. */ + for (i = 0; ref1[i]; i++); + size = i; + for (i = 0; ref2[i]; i++); + size += i; + + result = (REFERENCE **)xmalloc ((1 + size) * sizeof (REFERENCE *)); + + /* Copy the contents over. */ + for (i = 0; ref1[i]; i++) + result[i] = ref1[i]; + + j = i; + for (i = 0; ref2[i]; i++) + result[j++] = ref2[i]; + + result[j] = (REFERENCE *)NULL; + free (ref1); + free (ref2); + return (result); +} + +/* Free the data associated with REFERENCES. */ +void +info_free_references (references) + REFERENCE **references; +{ + register int i; + REFERENCE *entry; + + if (references) + { + for (i = 0; references && (entry = references[i]); i++) + { + maybe_free (entry->label); + maybe_free (entry->filename); + maybe_free (entry->nodename); + + free (entry); + } + + free (references); + } +} + +/* Search for sequences of whitespace or newlines in STRING, replacing + all such sequences with just a single space. Remove whitespace from + start and end of string. */ +void +canonicalize_whitespace (string) + char *string; +{ + register int i, j; + int len, whitespace_found, whitespace_loc; + char *temp; + + if (!string) + return; + + len = strlen (string); + temp = (char *)xmalloc (1 + len); + + /* Search for sequences of whitespace or newlines. Replace all such + sequences in the string with just a single space. */ + + whitespace_found = 0; + for (i = 0, j = 0; string[i]; i++) + { + if (whitespace_or_newline (string[i])) + { + whitespace_found++; + whitespace_loc = i; + continue; + } + else + { + if (whitespace_found && whitespace_loc) + { + whitespace_found = 0; + + /* Suppress whitespace at start of string. */ + if (j) + temp[j++] = ' '; + } + + temp[j++] = string[i]; + } + } + + /* Kill trailing whitespace. */ + if (j && whitespace (temp[j - 1])) + j--; + + temp[j] = '\0'; + strcpy (string, temp); + free (temp); +} + +/* String representation of a char returned by printed_representation (). */ +static char the_rep[10]; + +/* Return a pointer to a string which is the printed representation + of CHARACTER if it were printed at HPOS. */ +char * +printed_representation (character, hpos) + unsigned char character; + int hpos; +{ + register int i = 0; + int printable_limit; + + if (ISO_Latin_p) + printable_limit = 160; + else + printable_limit = 127; + + if (character == '\177') + { + the_rep[i++] = '^'; + the_rep[i++] = '?'; + } + else if (iscntrl (character)) + { + switch (character) + { + case '\r': + case '\n': + the_rep[i++] = character; + break; + + case '\t': + { + int tw; + + tw = ((hpos + 8) & 0xf8) - hpos; + while (i < tw) + the_rep[i++] = ' '; + } + break; + + default: + the_rep[i++] = '^'; + the_rep[i++] = (character | 0x40); + } + } + else if (character > printable_limit) + { + sprintf (the_rep + i, "\\%0o", character); + i = strlen (the_rep); + } + else + the_rep[i++] = character; + + the_rep[i] = '\0'; + + return (the_rep); +} + + +/* **************************************************************** */ +/* */ +/* Functions Static To This File */ +/* */ +/* **************************************************************** */ + +/* Amount of space allocated to INFO_PARSED_FILENAME via xmalloc (). */ +static int parsed_filename_size = 0; + +/* Amount of space allocated to INFO_PARSED_NODENAME via xmalloc (). */ +static int parsed_nodename_size = 0; + +static void save_string (), saven_string (); + +/* Remember FILENAME in PARSED_FILENAME. An empty FILENAME is translated + to a NULL pointer in PARSED_FILENAME. */ +static void +save_filename (filename) + char *filename; +{ + save_string (filename, &info_parsed_filename, &parsed_filename_size); +} + +/* Just like save_filename (), but you pass the length of the string. */ +static void +saven_filename (filename, len) + char *filename; + int len; +{ + saven_string (filename, len, + &info_parsed_filename, &parsed_filename_size); +} + +/* Remember NODENAME in PARSED_NODENAME. An empty NODENAME is translated + to a NULL pointer in PARSED_NODENAME. */ +static void +save_nodename (nodename) + char *nodename; +{ + save_string (nodename, &info_parsed_nodename, &parsed_nodename_size); +} + +/* Just like save_nodename (), but you pass the length of the string. */ +static void +saven_nodename (nodename, len) + char *nodename; + int len; +{ + saven_string (nodename, len, + &info_parsed_nodename, &parsed_nodename_size); +} + +/* Remember STRING in STRING_P. STRING_P should currently have STRING_SIZE_P + bytes allocated to it. An empty STRING is translated to a NULL pointer + in STRING_P. */ +static void +save_string (string, string_p, string_size_p) + char *string; + char **string_p; + int *string_size_p; +{ + if (!string || !*string) + { + if (*string_p) + free (*string_p); + + *string_p = (char *)NULL; + *string_size_p = 0; + } + else + { + if (strlen (string) >= *string_size_p) + *string_p = (char *)xrealloc + (*string_p, (*string_size_p = 1 + strlen (string))); + + strcpy (*string_p, string); + } +} + +/* Just like save_string (), but you also pass the length of STRING. */ +static void +saven_string (string, len, string_p, string_size_p) + char *string; + int len; + char **string_p; + int *string_size_p; +{ + if (!string) + { + if (*string_p) + free (*string_p); + + *string_p = (char *)NULL; + *string_size_p = 0; + } + else + { + if (len >= *string_size_p) + *string_p = (char *)xrealloc (*string_p, (*string_size_p = 1 + len)); + + strncpy (*string_p, string, len); + (*string_p)[len] = '\0'; + } +} + +/* Return a pointer to the part of PATHNAME that simply defines the file. */ +char * +filename_non_directory (pathname) + char *pathname; +{ + char *filename; + + filename = (char *) strrchr (pathname, '/'); + + if (filename) + filename++; + else + filename = pathname; + + return (filename); +} + +/* Return non-zero if NODE is one especially created by Info. */ +int +internal_info_node_p (node) + NODE *node; +{ +#if defined (NEVER) + if (node && + (node->filename && !*node->filename) && + !node->parent && node->nodename) + return (1); + else + return (0); +#else + return ((node != (NODE *)NULL) && ((node->flags & N_IsInternal) != 0)); +#endif /* !NEVER */ +} + +/* Make NODE appear to be one especially created by Info. */ +void +name_internal_node (node, name) + NODE *node; + char *name; +{ + if (!node) + return; + + node->filename = ""; + node->parent = (char *)NULL; + node->nodename = name; + node->flags |= N_IsInternal; +} + +/* Return the window displaying NAME, the name of an internally created + Info window. */ +WINDOW * +get_internal_info_window (name) + char *name; +{ + WINDOW *win; + + for (win = windows; win; win = win->next) + if (internal_info_node_p (win->node) && + (strcmp (win->node->nodename, name) == 0)) + break; + + return (win); +}
new file mode 100644 --- /dev/null +++ b/info/info-utils.h @@ -0,0 +1,140 @@ +/* info-utils.h -- Exported functions and variables from info-util.c. + $Id: info-utils.h,v 1.4 1996-11-13 03:41:41 jwe Exp $ + + This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993, 96 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_INFO_UTILS_H_) +#define _INFO_UTILS_H_ + +#if !defined (HAVE_STRCHR) +# undef strchr +# undef strrchr +# define strchr index +# define strrchr rindex +#endif /* !HAVE_STRCHR */ + +#include "nodes.h" +#include "window.h" +#include "search.h" + +/* Structure which describes a node reference, such as a menu entry or + cross reference. Arrays of such references can be built by calling + info_menus_of_node () or info_xrefs_of_node (). */ +typedef struct { + char *label; /* User Label. */ + char *filename; /* File where this node can be found. */ + char *nodename; /* Name of the node. */ + int start, end; /* Offsets within the containing node of LABEL. */ +} REFERENCE; + +/* When non-zero, various display and input functions handle ISO Latin + character sets correctly. */ +extern int ISO_Latin_p; + +/* Variable which holds the most recent filename parsed as a result of + calling info_parse_xxx (). */ +extern char *info_parsed_filename; + +/* Variable which holds the most recent nodename parsed as a result of + calling info_parse_xxx (). */ +extern char *info_parsed_nodename; + +/* Parse the filename and nodename out of STRING. If STRING doesn't + contain a filename (i.e., it is NOT (FILENAME)NODENAME) then set + INFO_PARSED_FILENAME to NULL. If second argument NEWLINES_OKAY is + non-zero, it says to allow the nodename specification to cross a + newline boundary (i.e., only `,', `.', or `TAB' can end the spec). */ +void info_parse_node (); + +/* Return a NULL terminated array of REFERENCE * which represents the menu + found in NODE. If there is no menu in NODE, just return a NULL pointer. */ +extern REFERENCE **info_menu_of_node (); + +/* Return a NULL terminated array of REFERENCE * which represents the cross + refrences found in NODE. If there are no cross references in NODE, just + return a NULL pointer. */ +extern REFERENCE **info_xrefs_of_node (); + +/* Glean cross references from BINDING->buffer + BINDING->start until + BINDING->end. Return an array of REFERENCE * that represents each + cross reference in this range. */ +extern REFERENCE **info_xrefs (); + +/* Get the entry associated with LABEL in REFERENCES. Return a pointer to + the reference if found, or NULL. */ +extern REFERENCE *info_get_labeled_reference (); + +/* Glean menu entries from BINDING->buffer + BINDING->start until we + have looked at the entire contents of BINDING. Return an array + of REFERENCE * that represents each menu item in this range. */ +extern REFERENCE **info_menu_items (); + +/* A utility function for concatenating REFERENCE **. Returns a new + REFERENCE ** which is the concatenation of REF1 and REF2. The REF1 + and REF2 arrays are freed, but their contents are not. */ +REFERENCE **info_concatenate_references (); + +/* Free the data associated with REFERENCES. */ +extern void info_free_references (); + +/* Search for sequences of whitespace or newlines in STRING, replacing + all such sequences with just a single space. Remove whitespace from + start and end of string. */ +void canonicalize_whitespace (); + +/* Return a pointer to a string which is the printed representation + of CHARACTER if it were printed at HPOS. */ +extern char *printed_representation (); + +/* Return a pointer to the part of PATHNAME that simply defines the file. */ +extern char *filename_non_directory (); + +/* Return non-zero if NODE is one especially created by Info. */ +extern int internal_info_node_p (); + +/* Make NODE appear to be one especially created by Info, and give it NAME. */ +extern void name_internal_node (); + +/* Return the window displaying NAME, the name of an internally created + Info window. */ +extern WINDOW *get_internal_info_window (); + +/* Return the node addressed by LABEL in NODE (usually one of "Prev:", + "Next:", "Up:", "File:", or "Node:". After a call to this function, + the global INFO_PARSED_NODENAME and INFO_PARSED_FILENAME contain + the information. */ +extern void info_parse_label (/* label, node */); + +#define info_label_was_found \ + (info_parsed_nodename != NULL || info_parsed_filename != NULL) + +#define info_file_label_of_node(n) info_parse_label (INFO_FILE_LABEL, n) +#define info_next_label_of_node(n) info_parse_label (INFO_NEXT_LABEL, n) +#define info_up_label_of_node(n) info_parse_label (INFO_UP_LABEL, n) +#define info_prev_label_of_node(n) \ + do { \ + info_parse_label (INFO_PREV_LABEL, n); \ + if (!info_label_was_found) \ + info_parse_label (INFO_ALTPREV_LABEL, n); \ + } while (0) + +#endif /* !_INFO_UTILS_H_ */
new file mode 100644 --- /dev/null +++ b/info/info.1 @@ -0,0 +1,229 @@ +.TH info 1 "7th December 1990" +.SH NAME +info \- GNU's hypertext system +.SH SYNOPSIS +.B info +[ +.B \-\-option-name option-value +] +.B \menu-item... +.SH COPYRIGHT +.if n Copyright (C) 1989, 1993 Free Software Foundation, Inc. +.if t Copyright \(co 1989, 1993 Free Software Foundation, Inc. +.SH DESCRIPTION +.LP +The GNU project has a hypertext system called +.I Info +which allows the same source file to be either printed as a +paper manual, or viewed using +.B info. +It is possible to use the +.B info +program from inside Emacs, or to use the stand-alone version described here. +This manual page gives a brief summary of its capabilities. + +.SH OPTIONS +.TP +.B \-\-directory directory-path +Add +.B directory-path +to the list of directory paths searched when +.B info +needs to find a file. You may issue +.B \-\-directory +multiple times. +Alternatively, you may specify a value for the environment variable +.B INFOPATH; +if +.B \-\-directory +is not given, the value of +.B INFOPATH +is used. The value of +.B INFOPATH +is a colon separated list of directory names. If you do not supply either +.B INFOPATH +or +.B \-\-directory-path, +.B info +uses a default path. +.TP +.B \-f filename +Specify a particular +.B info +file to visit. By default, +.B info +visits +the file +.B dir; +if you use this option, +.B info +will start with +.B (FILENAME)Top +as the first file and node. +.TP +.B \-n nodename +Specify a particular node to visit in the initial file that +.B info +loads. This is especially useful in conjunction with +.B \-\-file. +You may specify +.B \-\-node +multiple times. +.TP +.B -o file +Direct output to +.B file +instead of starting an interactive +.B info +session. +.TP +.B \-h +Produce a relatively brief description of the available +.B info +options. +.TP +.B \-\-version +Print the version information of +.B info +and exit. +.TP +.B menu-item +.B info +treats its remaining arguments as the names of menu items. +The first argument is a menu item in the initial node visited, +while the second argument is a menu item in the first argument's +node. You can easily move to the node of your choice by +specifying the menu names which describe the path to that node. +For example, + +.B info emacs buffers + +first selects the menu item +.B emacs +in the node +.B (dir)Top, +and then selects the menu item +.B buffers +in the node +.B (emacs)Top. +.SH COMMANDS +When in +.B info +the following commands are available: +.TP +.B h +Invoke the Info tutorial. +.TP +.B ? +Get a short summary of +.B info +commands. +.TP +.B h +Select the +.B info +node from the main directory; this is much more complete than just +using +.B ?. +.TP +.B Ctrl-g +Abort whatever you are doing. +.TP +.B Ctrl-l +Redraw the screen. +.PP +Selecting other nodes: +.TP +.B n +Move to the "next" node of this node. +.TP +.B p +Move to the "previous" node of this node. +.TP +.B u +Move to this node's "up" node. +.TP +.B m +Pick a menu item specified by name. Picking a menu item causes another +node to be selected. You do not need to type a complete nodename; if +you type a few letters and then a space or tab +.B info +will will try to fill in the rest of the nodename. If you ask for further +completion without typing any more characters you'll be given a list +of possibilities; you can also get the list with +.B ?. +If you type a few characters and then hit return +.B info +will try to do a completion, and if it is ambigous use the first possibility. +.TP +.B f +Follow a cross reference. You are asked for the name of the reference, +using command completion as for +.B m. +.TP +.B l +Move to the last node you were at. +.PP +Moving within a node: +.TP +.B Space +Scroll forward a page. +.TP +.B DEL +Scroll backward a page. +.TP +.B b +Go to the beginning of this node. +.PP +Advanced commands: +.TP +.B q +Quit +.B info. +.TP +.B 1 +Pick first item in node's menu. +.TP +.B 2 \-\- 5 +Pick second ... fifth item in node's menu. +.TP +.B g +Move to node specified by name. You may include a filename as well, +as +.B (FILENAME)NODENAME. +.TP +.B s +Search through this +.B info +file for a specified string, and select the node in which +the next occurrence is found. +.TP +.B M-x print-node +Pipe the contents of the current node through the command in the +environment variable +.B INFO_PRINT_COMMAND. +If the variable does not exist, the node is simply piped to +.B lpr. +.SH ENVIRONMENT +.TP +.B INFOPATH +A colon-separated list of directories to search for +.B info +files. Used if +.B \-\-directory +is not given. +.TP +.B INFO_PRINT_COMMAND +The command used for printing. +.SH SEE ALSO +.BR emacs (1) +.SH AUTHOR +.RS +Brian Fox, Free Software Foundation +.br +bfox@ai.mit.edu +.SH MANUAL AUTHOR +.RS +Robert Lupton; updated by Robert J. Chassell. +.br +rhl@astro.princeton.edu; bob@gnu.ai.mit.edu
new file mode 100644 --- /dev/null +++ b/info/info.c @@ -0,0 +1,619 @@ +/* info.c -- Display nodes of Info files in multiple windows. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993, 96 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include "info.h" +#include "dribble.h" +#include "getopt.h" +#if defined (HANDLE_MAN_PAGES) +# include "man.h" +#endif /* HANDLE_MAN_PAGES */ + +/* The version numbers of this version of Info. */ +int info_major_version = 2; +int info_minor_version = 16; +int info_patch_level = 0; + +/* Non-zero means search all indices for APROPOS_SEARCH_STRING. */ +static int apropos_p = 0; + +/* Variable containing the string to search for when apropos_p is non-zero. */ +static char *apropos_search_string = (char *)NULL; + +/* Non-zero means search all indices for INDEX_SEARCH_STRING. Unlike + apropos, this puts the user at the node, running info. */ +static int index_search_p = 0; + +/* Variable containing the string to search for when index_search_p is + non-zero. */ +static char *index_search_string = (char *)NULL; + +/* Non-zero means print version info only. */ +static int print_version_p = 0; + +/* Non-zero means print a short description of the options. */ +static int print_help_p = 0; + +/* Array of the names of nodes that the user specified with "--node" on the + command line. */ +static char **user_nodenames = (char **)NULL; +static int user_nodenames_index = 0; +static int user_nodenames_slots = 0; + +/* String specifying the first file to load. This string can only be set + by the user specifying "--file" on the command line. */ +static char *user_filename = (char *)NULL; + +/* String specifying the name of the file to dump nodes to. This value is + filled if the user speficies "--output" on the command line. */ +static char *user_output_filename = (char *)NULL; + +/* Non-zero indicates that when "--output" is specified, all of the menu + items of the specified nodes (and their subnodes as well) should be + dumped in the order encountered. This basically can print a book. */ +int dump_subnodes = 0; + +/* Structure describing the options that Info accepts. We pass this structure + to getopt_long (). If you add or otherwise change this structure, you must + also change the string which follows it. */ +#define APROPOS_OPTION 1 +#define DRIBBLE_OPTION 2 +#define RESTORE_OPTION 3 +#define IDXSRCH_OPTION 4 +static struct option long_options[] = { + { "apropos", 1, 0, APROPOS_OPTION }, + { "directory", 1, 0, 'd' }, + { "node", 1, 0, 'n' }, + { "file", 1, 0, 'f' }, + { "subnodes", 0, &dump_subnodes, 1 }, + { "output", 1, 0, 'o' }, + { "help", 0, &print_help_p, 1 }, + { "version", 0, &print_version_p, 1 }, + { "dribble", 1, 0, DRIBBLE_OPTION }, + { "restore", 1, 0, RESTORE_OPTION }, + { "index-search", 1, 0, IDXSRCH_OPTION }, + {NULL, 0, NULL, 0} +}; + +/* String describing the shorthand versions of the long options found above. */ +static char *short_options = "d:n:f:o:s"; + +/* When non-zero, the Info window system has been initialized. */ +int info_windows_initialized_p = 0; + +/* Some "forward" declarations. */ +static void usage (), info_short_help (), remember_info_program_name (); + + +/* **************************************************************** */ +/* */ +/* Main Entry Point to the Info Program */ +/* */ +/* **************************************************************** */ + +int +main (argc, argv) + int argc; + char **argv; +{ + int getopt_long_index; /* Index returned by getopt_long (). */ + NODE *initial_node; /* First node loaded by Info. */ + + remember_info_program_name (argv[0]); + + while (1) + { + int option_character; + + option_character = getopt_long + (argc, argv, short_options, long_options, &getopt_long_index); + + /* getopt_long () returns EOF when there are no more long options. */ + if (option_character == EOF) + break; + + /* If this is a long option, then get the short version of it. */ + if (option_character == 0 && long_options[getopt_long_index].flag == 0) + option_character = long_options[getopt_long_index].val; + + /* Case on the option that we have received. */ + switch (option_character) + { + case 0: + break; + + /* User wants to add a directory. */ + case 'd': + info_add_path (optarg, INFOPATH_PREPEND); + break; + + /* User is specifying a particular node. */ + case 'n': + add_pointer_to_array (optarg, user_nodenames_index, user_nodenames, + user_nodenames_slots, 10, char *); + break; + + /* User is specifying a particular Info file. */ + case 'f': + if (user_filename) + free (user_filename); + + user_filename = strdup (optarg); + break; + + /* User is specifying the name of a file to output to. */ + case 'o': + if (user_output_filename) + free (user_output_filename); + user_output_filename = strdup (optarg); + break; + + /* User is specifying that she wishes to dump the subnodes of + the node that she is dumping. */ + case 's': + dump_subnodes = 1; + break; + + /* User has specified a string to search all indices for. */ + case APROPOS_OPTION: + apropos_p = 1; + maybe_free (apropos_search_string); + apropos_search_string = strdup (optarg); + break; + + /* User has specified a dribble file to receive keystrokes. */ + case DRIBBLE_OPTION: + close_dribble_file (); + open_dribble_file (optarg); + break; + + /* User has specified an alternate input stream. */ + case RESTORE_OPTION: + info_set_input_from_file (optarg); + break; + + /* User has specified a string to search all indices for. */ + case IDXSRCH_OPTION: + index_search_p = 1; + maybe_free (index_search_string); + index_search_string = strdup (optarg); + break; + + default: + usage (); + } + } + + /* If the output device is not a terminal, and no output filename has been + specified, make user_output_filename be "-", so that the info is written + to stdout, and turn on the dumping of subnodes. */ + if ((!isatty (fileno (stdout))) && (user_output_filename == (char *)NULL)) + { + user_output_filename = strdup ("-"); + dump_subnodes = 1; + } + + /* If the user specified --version, then show the version and exit. */ + if (print_version_p) + { + printf ("GNU Info (Texinfo 3.9) %s\n", version_string ()); + puts ("Copyright (C) 1996 Free Software Foundation, Inc.\n\ +There is NO warranty. You may redistribute this software\n\ +under the terms of the GNU General Public License.\n\ +For more information about these matters, see the files named COPYING."); + exit (0); + } + + /* If the `--help' option was present, show the help and exit. */ + if (print_help_p) + { + info_short_help (); + exit (0); + } + + /* If the user hasn't specified a path for Info files, default that path + now. */ + if (!infopath) + { + char *path_from_env, *getenv (); + + path_from_env = getenv ("INFOPATH"); + + if (path_from_env) + info_add_path (path_from_env, INFOPATH_PREPEND); + else + info_add_path (DEFAULT_INFOPATH, INFOPATH_PREPEND); + } + + /* If the user specified a particular filename, add the path of that + file to the contents of INFOPATH. */ + if (user_filename) + { + char *directory_name, *temp; + + directory_name = strdup (user_filename); + temp = filename_non_directory (directory_name); + + if (temp != directory_name) + { + *temp = 0; + info_add_path (directory_name, INFOPATH_PREPEND); + } + + free (directory_name); + } + + /* If the user wants to search every known index for a given string, + do that now, and report the results. */ + if (apropos_p) + { + info_apropos (apropos_search_string); + exit (0); + } + + /* Get the initial Info node. It is either "(dir)Top", or what the user + specifed with values in user_filename and user_nodenames. */ + if (user_nodenames) + initial_node = info_get_node (user_filename, user_nodenames[0]); + else + initial_node = info_get_node (user_filename, (char *)NULL); + + /* If we couldn't get the initial node, this user is in trouble. */ + if (!initial_node) + { + if (info_recent_file_error) + info_error (info_recent_file_error); + else + info_error + (CANT_FIND_NODE, user_nodenames ? user_nodenames[0] : "Top"); + exit (1); + } + + /* Special cases for when the user specifies multiple nodes. If we are + dumping to an output file, dump all of the nodes specified. Otherwise, + attempt to create enough windows to handle the nodes that this user wants + displayed. */ + if (user_nodenames_index > 1) + { + free (initial_node); + + if (user_output_filename) + dump_nodes_to_file + (user_filename, user_nodenames, user_output_filename, dump_subnodes); + else + begin_multiple_window_info_session (user_filename, user_nodenames); + + exit (0); + } + + /* If the user specified `--index-search string', start the info + session in the node corresponding to the first match. */ + if (index_search_p) + { + int status = 0; + + initialize_info_session (initial_node, 0); + + if (index_entry_exists (windows, index_search_string)) + { + terminal_clear_screen (); + terminal_prep_terminal (); + display_update_display (windows); + info_last_executed_command = (VFunction *)NULL; + + do_info_index_search (windows, 0, index_search_string); + + info_read_and_dispatch (); + + terminal_unprep_terminal (); + + /* On program exit, leave the cursor at the bottom of the + window, and restore the terminal IO. */ + terminal_goto_xy (0, screenheight - 1); + terminal_clear_to_eol (); + fflush (stdout); + } + else + { + fprintf (stderr, "no entries found\n"); + status = -1; + } + + close_dribble_file (); + exit (status); + } + + /* If there are arguments remaining, they are the names of menu items + in sequential info files starting from the first one loaded. That + file name is either "dir", or the contents of user_filename if one + was specified. */ + while (optind != argc) + { + REFERENCE **menu; + REFERENCE *entry; + NODE *node; + char *arg; + static char *first_arg = (char *)NULL; + + /* Remember the name of the menu entry we want. */ + arg = argv[optind++]; + + if (first_arg == (char *)NULL) + first_arg = arg; + + /* Build and return a list of the menu items in this node. */ + menu = info_menu_of_node (initial_node); + + /* If there wasn't a menu item in this node, stop here, but let + the user continue to use Info. Perhaps they wanted this node + and didn't realize it. */ + if (!menu) + { +#if defined (HANDLE_MAN_PAGES) + if (first_arg == arg) + { + node = make_manpage_node (first_arg); + if (node) + goto maybe_got_node; + } +#endif /* HANDLE_MAN_PAGES */ + begin_info_session_with_error + (initial_node, "There is no menu in this node."); + exit (0); + } + + /* Find the specified menu item. */ + entry = info_get_labeled_reference (arg, menu); + + /* If the item wasn't found, search the list sloppily. Perhaps this + user typed "buffer" when they really meant "Buffers". */ + if (!entry) + { + register int i; + int best_guess = -1; + + for (i = 0; entry = menu[i]; i++) + { + if (strcasecmp (entry->label, arg) == 0) + break; + else + if (strncasecmp (entry->label, arg, strlen (arg)) == 0) + best_guess = i; + } + + if (!entry && best_guess != -1) + entry = menu[best_guess]; + } + + /* If we failed to find the reference, start Info with the current + node anyway. It is probably a misspelling. */ + if (!entry) + { + char *error_message = "There is no menu item \"%s\" in this node."; + +#if defined (HANDLE_MAN_PAGES) + if (first_arg == arg) + { + node = make_manpage_node (first_arg); + if (node) + goto maybe_got_node; + } +#endif /* HANDLE_MAN_PAGES */ + + info_free_references (menu); + + /* If we were supposed to dump this node, complain. */ + if (user_output_filename) + info_error (error_message, arg); + else + begin_info_session_with_error (initial_node, error_message, arg); + + exit (0); + } + + /* We have found the reference that the user specified. Clean it + up a little bit. */ + if (!entry->filename) + { + if (initial_node->parent) + entry->filename = strdup (initial_node->parent); + else + entry->filename = strdup (initial_node->filename); + } + + /* Find this node. If we can find it, then turn the initial_node + into this one. If we cannot find it, try using the label of the + entry as a file (i.e., "(LABEL)Top"). Otherwise the Info file is + malformed in some way, and we will just use the current value of + initial node. */ + node = info_get_node (entry->filename, entry->nodename); + +#if defined (HANDLE_MAN_PAGES) + if ((first_arg == arg) && !node) + { + node = make_manpage_node (first_arg); + if (node) + goto maybe_got_node; + } +#endif /* HANDLE_MAN_PAGES */ + + if (!node && entry->nodename && + (strcmp (entry->label, entry->nodename) == 0)) + node = info_get_node (entry->label, "Top"); + + maybe_got_node: + if (node) + { + free (initial_node); + initial_node = node; + info_free_references (menu); + } + else + { + char *temp = strdup (entry->label); + char *error_message; + + error_message = "Unable to find the node referenced by \"%s\"."; + + info_free_references (menu); + + /* If we were trying to dump the node, then give up. Otherwise, + start the session with an error message. */ + if (user_output_filename) + info_error (error_message, temp); + else + begin_info_session_with_error (initial_node, error_message, temp); + + exit (0); + } + } + + /* If the user specified that this node should be output, then do that + now. Otherwise, start the Info session with this node. */ + if (user_output_filename) + dump_node_to_file (initial_node, user_output_filename, dump_subnodes); + else + begin_info_session (initial_node); + + exit (0); +} + +/* Return a string describing the current version of Info. */ +char * +version_string () +{ + static char *vstring = (char *)NULL; + + if (!vstring) + { + vstring = (char *)xmalloc (50); + sprintf (vstring, "%d.%d", info_major_version, info_minor_version); + if (info_patch_level) + sprintf (vstring + strlen (vstring), "-p%d", info_patch_level); + } + return (vstring); +} + +/* **************************************************************** */ +/* */ +/* Error Handling for Info */ +/* */ +/* **************************************************************** */ + +static char *program_name = (char *)NULL; + +static void +remember_info_program_name (fullpath) + char *fullpath; +{ + char *filename; + + filename = filename_non_directory (fullpath); + program_name = strdup (filename); +} + +/* Non-zero if an error has been signalled. */ +int info_error_was_printed = 0; + +/* Non-zero means ring terminal bell on errors. */ +int info_error_rings_bell_p = 1; + +/* Print FORMAT with ARG1 and ARG2. If the window system was initialized, + then the message is printed in the echo area. Otherwise, a message is + output to stderr. */ +void +info_error (format, arg1, arg2) + char *format; + void *arg1, *arg2; +{ + info_error_was_printed = 1; + + if (!info_windows_initialized_p || display_inhibited) + { + fprintf (stderr, "%s: ", program_name); + fprintf (stderr, format, arg1, arg2); + fprintf (stderr, "\n"); + fflush (stderr); + } + else + { + if (!echo_area_is_active) + { + if (info_error_rings_bell_p) + terminal_ring_bell (); + window_message_in_echo_area (format, arg1, arg2); + } + else + { + NODE *temp; + + temp = build_message_node (format, arg1, arg2); + if (info_error_rings_bell_p) + terminal_ring_bell (); + inform_in_echo_area (temp->contents); + free (temp->contents); + free (temp); + } + } +} + +/* Produce a very brief descripton of the available options and exit with + an error. */ +static void +usage () +{ + fprintf (stderr,"%s\n%s\n%s\n%s\n%s\n", +"Usage: info [-d dir-path] [-f info-file] [-o output-file] [-n node-name]...", +" [--directory dir-path] [--file info-file] [--node node-name]...", +" [--help] [--output output-file] [--subnodes] [--version]", +" [--dribble dribble-file] [--restore from-file]", +" [menu-selection ...]"); + exit (1); +} + +/* Produce a scaled down description of the available options to Info. */ +static void +info_short_help () +{ + puts ("\ +Here is a quick description of Info's options. For a more complete\n\ +description of how to use Info, type `info info options'.\n\ +\n\ + --directory DIR Add DIR to INFOPATH.\n\ + --dribble FILENAME Remember user keystrokes in FILENAME.\n\ + --file FILENAME Specify Info file to visit.\n\ + --node NODENAME Specify nodes in first visited Info file.\n\ + --output FILENAME Output selected nodes to FILENAME.\n\ + --restore FILENAME Read initial keystrokes from FILENAME.\n\ + --subnodes Recursively output menu items.\n\ + --help Get this help message.\n\ + --version Display Info's version information.\n\ +\n\ +Remaining arguments to Info are treated as the names of menu\n\ +items in the initial node visited. You can easily move to the\n\ +node of your choice by specifying the menu names which describe\n\ +the path to that node. For example, `info emacs buffers'.\n\ +\n\ +Email bug reports to bug-texinfo@prep.ai.mit.edu."); + + exit (0); +}
new file mode 100644 --- /dev/null +++ b/info/info.h @@ -0,0 +1,100 @@ +/* info.h -- Header file which includes all of the other headers. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_INFO_H_) +#define _INFO_H_ + +#include <stdio.h> +#include <ctype.h> +#include <sys/types.h> +#include <sys/stat.h> +#if defined (HAVE_STRING_H) +#include <string.h> +#endif /* HAVE_STRING_H */ +#include "filesys.h" +#include "display.h" +#include "session.h" +#include "echo_area.h" +#include "doc.h" +#include "footnotes.h" +#include "gc.h" + +/* A structure associating the nodes visited in a particular window. */ +typedef struct { + WINDOW *window; /* The window that this list is attached to. */ + NODE **nodes; /* Array of nodes visited in this window. */ + int *pagetops; /* For each node in NODES, the pagetop. */ + long *points; /* For each node in NODES, the point. */ + int current; /* Index in NODES of the current node. */ + int nodes_index; /* Index where to add the next node. */ + int nodes_slots; /* Number of slots allocated to NODES. */ +} INFO_WINDOW; + +/* Array of structures describing for each window which nodes have been + visited in that window. */ +extern INFO_WINDOW **info_windows; + +/* For handling errors. If you initialize the window system, you should + also set info_windows_initialized_p to non-zero. It is used by the + info_error () function to determine how to format and output errors. */ +extern int info_windows_initialized_p; + +/* Non-zero if an error message has been printed. */ +extern int info_error_was_printed; + +/* Non-zero means ring terminal bell on errors. */ +extern int info_error_rings_bell_p; + +/* Print FORMAT with ARG1 and ARG2. If the window system was initialized, + then the message is printed in the echo area. Otherwise, a message is + output to stderr. */ +extern void info_error (); + +/* The version numbers of Info. */ +extern int info_major_version, info_minor_version, info_patch_level; + +/* How to get the version string for this version of Info. Returns + something similar to "2.11". */ +extern char *version_string (); + +/* Error message defines. */ +#define CANT_FIND_NODE "Cannot find the node \"%s\"." +#define CANT_FILE_NODE "Cannot find the node \"(%s)%s\"." +#define CANT_FIND_WIND "Cannot find a window!" +#define CANT_FIND_POINT "Point doesn't appear within this window's node!" +#define CANT_KILL_LAST "Cannot delete the last window." +#define NO_MENU_NODE "No menu in this node." +#define NO_FOOT_NODE "No footnotes in this node." +#define NO_XREF_NODE "No cross references in this node." +#define NO_POINTER "No \"%s\" pointer for this node." +#define UNKNOWN_COMMAND "Unknown Info command `%c'. `?' for help." +#define TERM_TOO_DUMB "Terminal type \"%s\" is not smart enough to run Info." +#define AT_NODE_BOTTOM "You are already at the last page of this node." +#define AT_NODE_TOP "You are already at the first page of this node." +#define ONE_WINDOW "Only one window." +#define WIN_TOO_SMALL "Resulting window would be too small." +#define CANT_MAKE_HELP \ +"There isn't enough room to make a help window. Please delete a window." + +#endif /* !_INFO_H_ */ +
new file mode 100644 --- /dev/null +++ b/info/info.texi @@ -0,0 +1,916 @@ +\input texinfo @c -*-texinfo-*- +@comment %**start of header +@setfilename info.info +@settitle Info 1.0 +@comment %**end of header +@comment $Id: info.texi,v 1.3 1996-11-13 03:41:41 jwe Exp $ + +@dircategory Texinfo documentation system +@direntry +* Info: (info). Documentation browsing system. +@end direntry + +@ifinfo +This file describes how to use Info, +the on-line, menu-driven GNU documentation system. + +Copyright (C) 1989, 92, 96 Free Software Foundation, Inc. + +Permission is granted to make and distribute verbatim copies of +this manual provided the copyright notice and this permission notice +are preserved on all copies. + +@ignore +Permission is granted to process this file through TeX and print the +results, provided the printed document carries copying permission +notice identical to this one except for the removal of this paragraph +(this paragraph not being relevant to the printed manual). + +@end ignore +Permission is granted to copy and distribute modified versions of this +manual under the conditions for verbatim copying, provided that the entire +resulting derived work is distributed under the terms of a permission +notice identical to this one. + +Permission is granted to copy and distribute translations of this manual +into another language, under the above conditions for modified versions, +except that this permission notice may be stated in a translation approved +by the Free Software Foundation. +@end ifinfo + +@titlepage +@sp 11 +@center @titlefont{Info} +@sp 2 +@center The +@sp 2 +@center On-line, Menu-driven +@sp 2 +@center GNU Documentation System + +@page +@vskip 0pt plus 1filll +Copyright @copyright{} 1989, 1992, 1993 Free Software Foundation, Inc. +@sp 2 + +Published by the Free Software Foundation @* +59 Temple Place - Suite 330 @* +Boston, MA 02111-1307, USA. + +Permission is granted to make and distribute verbatim copies of +this manual provided the copyright notice and this permission notice +are preserved on all copies. + +Permission is granted to copy and distribute modified versions of this +manual under the conditions for verbatim copying, provided that the entire +resulting derived work is distributed under the terms of a permission +notice identical to this one. + +Permission is granted to copy and distribute translations of this manual +into another language, under the above conditions for modified versions, +except that this permission notice may be stated in a translation approved +by the Free Software Foundation. +@end titlepage + +@ifinfo +@node Top, Getting Started, (dir), (dir) +@top Info: An Introduction + +Info is a program for reading documentation, which you are using now. + +To learn how to use Info, type the command @kbd{h}. It brings you +to a programmed instruction sequence. + +@c Need to make sure that `Info-help' goes to the right node, +@c which is the first node of the first chapter. (It should.) +@c (Info-find-node "info" +@c (if (< (window-height) 23) +@c "Help-Small-Screen" +@c "Help"))) + +To learn advanced Info commands, type @kbd{n} twice. This brings you to +@cite{Info for Experts}, skipping over the `Getting Started' chapter. +@end ifinfo + +@menu +* Getting Started:: Getting started using an Info reader. +* Advanced Info:: Advanced commands within Info. +* Create an Info File:: How to make your own Info file. +* The Standalone Info Program: (info-stnd.info). +@end menu + +@node Getting Started, Advanced Info, Top, Top +@comment node-name, next, previous, up +@chapter Getting Started + +This first part of the Info manual describes how to get around inside +of Info. The second part of the manual describes various advanced +Info commands, and how to write an Info as distinct from a Texinfo +file. The third part is about how to generate Info files from +Texinfo files. + +@iftex +This manual is primarily designed for use on a computer, so that you can +try Info commands while reading about them. Reading it on paper is less +effective, since you must take it on faith that the commands described +really do what the manual says. By all means go through this manual now +that you have it; but please try going through the on-line version as +well. + +There are two ways of looking at the online version of this manual: + +@enumerate +@item +Type @code{info} at your shell's command line. This approach uses a +small stand-alone program designed just to read Info files. + +@item +Type @code{emacs} at the command line; then type @kbd{C-h i} (Control +@kbd{h}, followed by @kbd{i}). This approach uses the Info mode of the +Emacs program, an editor with many other capabilities. +@end enumerate + +In either case, then type @kbd{mInfo} (just the letters), followed by +@key{RET}---the ``Return'' or ``Enter'' key. At this point, you should +be ready to follow the instructions in this manual as you read them on +the screen. +@c FIXME! (pesch@cygnus.com, 14 dec 1992) +@c Is it worth worrying about what-if the beginner goes to somebody +@c else's Emacs session, which already has an Info running in the middle +@c of something---in which case these simple instructions won't work? +@end iftex + +@menu +* Help-Small-Screen:: Starting Info on a Small Screen +* Help:: How to use Info +* Help-P:: Returning to the Previous node +* Help-^L:: The Space, Rubout, B and ^L commands. +* Help-M:: Menus +* Help-Adv:: Some advanced Info commands +* Help-Q:: Quitting Info +@end menu + +@node Help-Small-Screen, Help, , Getting Started +@comment node-name, next, previous, up +@section Starting Info on a Small Screen + +@iftex +(In Info, you only see this section if your terminal has a small +number of lines; most readers pass by it without seeing it.) +@end iftex + +Since your terminal has an unusually small number of lines on its +screen, it is necessary to give you special advice at the beginning. + +If you see the text @samp{--All----} at near the bottom right corner +of the screen, it means the entire text you are looking at fits on the +screen. If you see @samp{--Top----} instead, it means that there is +more text below that does not fit. To move forward through the text +and see another screen full, press the Space bar, @key{SPC}. To move +back up, press the key labeled @samp{Backspace} or @key{Delete}. + +@ifinfo +Here are 40 lines of junk, so you can try Spaces and Deletes and +see what they do. At the end are instructions of what you should do +next. + +This is line 17 @* +This is line 18 @* +This is line 19 @* +This is line 20 @* +This is line 21 @* +This is line 22 @* +This is line 23 @* +This is line 24 @* +This is line 25 @* +This is line 26 @* +This is line 27 @* +This is line 28 @* +This is line 29 @* +This is line 30 @* +This is line 31 @* +This is line 32 @* +This is line 33 @* +This is line 34 @* +This is line 35 @* +This is line 36 @* +This is line 37 @* +This is line 38 @* +This is line 39 @* +This is line 40 @* +This is line 41 @* +This is line 42 @* +This is line 43 @* +This is line 44 @* +This is line 45 @* +This is line 46 @* +This is line 47 @* +This is line 48 @* +This is line 49 @* +This is line 50 @* +This is line 51 @* +This is line 52 @* +This is line 53 @* +This is line 54 @* +This is line 55 @* +This is line 56 @* + +If you have managed to get here, go back to the beginning with +Delete, and come back here again, then you understand Space and +Delete. So now type an @kbd{n} ---just one character; don't type +the quotes and don't type the Return key afterward--- to +get to the normal start of the course. +@end ifinfo + +@node Help, Help-P, Help-Small-Screen, Getting Started +@comment node-name, next, previous, up +@section How to use Info + +You are talking to the program Info, for reading documentation. + + Right now you are looking at one @dfn{Node} of Information. +A node contains text describing a specific topic at a specific +level of detail. This node's topic is ``how to use Info''. + + The top line of a node is its @dfn{header}. This node's header (look at +it now) says that it is the node named @samp{Help} in the file +@file{info}. It says that the @samp{Next} node after this one is the node +called @samp{Help-P}. An advanced Info command lets you go to any node +whose name you know. + + Besides a @samp{Next}, a node can have a @samp{Previous} or an @samp{Up}. +This node has a @samp{Previous} but no @samp{Up}, as you can see. + + Now it is time to move on to the @samp{Next} node, named @samp{Help-P}. + +>> Type @samp{n} to move there. Type just one character; + do not type the quotes and do not type a @key{RET} afterward. + +@samp{>>} in the margin means it is really time to try a command. + +@node Help-P, Help-^L, Help, Getting Started +@comment node-name, next, previous, up +@section Returning to the Previous node + +This node is called @samp{Help-P}. The @samp{Previous} node, as you see, +is @samp{Help}, which is the one you just came from using the @kbd{n} +command. Another @kbd{n} command now would take you to the next +node, @samp{Help-^L}. + +>> But do not do that yet. First, try the @kbd{p} command, which takes + you to the @samp{Previous} node. When you get there, you can do an + @kbd{n} again to return here. + + This all probably seems insultingly simple so far, but @emph{do not} be +led into skimming. Things will get more complicated soon. Also, +do not try a new command until you are told it is time to. Otherwise, +you may make Info skip past an important warning that was coming up. + +>> Now do an @kbd{n} to get to the node @samp{Help-^L} and learn more. + +@node Help-^L, Help-M, Help-P, Getting Started +@comment node-name, next, previous, up +@section The Space, Delete, B and ^L commands. + + This node's header tells you that you are now at node @samp{Help-^L}, and +that @kbd{p} would get you back to @samp{Help-P}. The node's title is +underlined; it says what the node is about (most nodes have titles). + + This is a big node and it does not all fit on your display screen. +You can tell that there is more that is not visible because you +can see the string @samp{--Top-----} rather than @samp{--All----} near +the bottom right corner of the screen. + + The Space, Delete and @kbd{B} commands exist to allow you to ``move +around'' in a node that does not all fit on the screen at once. +Space moves forward, to show what was below the bottom of the screen. +Delete moves backward, to show what was above the top of the screen +(there is not anything above the top until you have typed some spaces). + +>> Now try typing a Space (afterward, type a Delete to return here). + + When you type the space, the two lines that were at the bottom of +the screen appear at the top, followed by more lines. Delete takes +the two lines from the top and moves them to the bottom, +@emph{usually}, but if there are not a full screen's worth of lines +above them they may not make it all the way to the bottom. + + If you type Space when there is no more to see, it rings the +bell and otherwise does nothing. The same goes for Delete when +the header of the node is visible. + + If your screen is ever garbaged, you can tell Info to print it out +again by typing @kbd{C-l} (@kbd{Control-L}, that is---hold down ``Control'' and +type an @key{L} or @kbd{l}). + +>> Type @kbd{C-l} now. + + To move back to the beginning of the node you are on, you can type +a lot of Deletes. You can also type simply @kbd{b} for beginning. +>> Try that now. (We have put in enough verbiage to push this past +the first screenful, but screens are so big nowadays that perhaps it +isn't enough. You may need to shrink your Emacs or Info window.) +Then come back, with Spaces. + + If your screen is very tall, all of this node might fit at once. +In that case, "b" won't do anything. Sorry; what can we do? + + You have just learned a considerable number of commands. If you +want to use one but have trouble remembering which, you should type +a @key{?} which prints out a brief list of commands. When you are +finished looking at the list, make it go away by typing a @key{SPC}. + +>> Type a @key{?} now. After it finishes, type a @key{SPC}. + + (If you are using the standalone Info reader, type `l' to return here.) + + From now on, you will encounter large nodes without warning, and +will be expected to know how to use Space and Delete to move +around in them without being told. Since not all terminals have +the same size screen, it would be impossible to warn you anyway. + +>> Now type @kbd{n} to see the description of the @kbd{m} command. + +@node Help-M, Help-Adv, Help-^L, Getting Started +@comment node-name, next, previous, up +@section Menus + +Menus and the @kbd{m} command + + With only the @kbd{n} and @kbd{p} commands for moving between nodes, nodes +are restricted to a linear sequence. Menus allow a branching +structure. A menu is a list of other nodes you can move to. It is +actually just part of the text of the node formatted specially so that +Info can interpret it. The beginning of a menu is always identified +by a line which starts with @samp{* Menu:}. A node contains a menu if and +only if it has a line in it which starts that way. The only menu you +can use at any moment is the one in the node you are in. To use a +menu in any other node, you must move to that node first. + + After the start of the menu, each line that starts with a @samp{*} +identifies one subtopic. The line usually contains a brief name +for the subtopic (followed by a @samp{:}), the name of the node that talks +about that subtopic, and optionally some further description of the +subtopic. Lines in the menu that do not start with a @samp{*} have no +special meaning---they are only for the human reader's benefit and do +not define additional subtopics. Here is an example: + +@example +* Foo: FOO's Node This tells about FOO +@end example + +The subtopic name is Foo, and the node describing it is @samp{FOO's Node}. +The rest of the line is just for the reader's Information. +[[ But this line is not a real menu item, simply because there is +no line above it which starts with @samp{* Menu:}.]] + + When you use a menu to go to another node (in a way that will be +described soon), what you specify is the subtopic name, the first +thing in the menu line. Info uses it to find the menu line, extracts +the node name from it, and goes to that node. The reason that there +is both a subtopic name and a node name is that the node name must be +meaningful to the computer and may therefore have to be ugly looking. +The subtopic name can be chosen just to be convenient for the user to +specify. Often the node name is convenient for the user to specify +and so both it and the subtopic name are the same. There is an +abbreviation for this: + +@example +* Foo:: This tells about FOO +@end example + +@noindent +This means that the subtopic name and node name are the same; they are +both @samp{Foo}. + +>> Now use Spaces to find the menu in this node, then come back to + the front with a @kbd{b} and some Spaces. As you see, a menu is + actually visible in its node. If you cannot find a menu in a node + by looking at it, then the node does not have a menu and the + @kbd{m} command is not available. + + The command to go to one of the subnodes is @kbd{m}---but @emph{do +not do it yet!} Before you use @kbd{m}, you must understand the +difference between commands and arguments. So far, you have learned +several commands that do not need arguments. When you type one, Info +processes it and is instantly ready for another command. The @kbd{m} +command is different: it is incomplete without the @dfn{name of the +subtopic}. Once you have typed @kbd{m}, Info tries to read the +subtopic name. + + Now look for the line containing many dashes near the bottom of the +screen. There is one more line beneath that one, but usually it is +blank. If it is empty, Info is ready for a command, such as @kbd{n} +or @kbd{b} or Space or @kbd{m}. If that line contains text ending +in a colon, it mean Info is trying to read the @dfn{argument} to a +command. At such times, commands do not work, because Info tries to +use them as the argument. You must either type the argument and +finish the command you started, or type @kbd{Control-g} to cancel the +command. When you have done one of those things, the line becomes +blank again. + + The command to go to a subnode via a menu is @kbd{m}. After you type +the @kbd{m}, the line at the bottom of the screen says @samp{Menu item: }. +You must then type the name of the subtopic you want, and end it with +a @key{RET}. + + You can abbreviate the subtopic name. If the abbreviation is not +unique, the first matching subtopic is chosen. Some menus put +the shortest possible abbreviation for each subtopic name in capital +letters, so you can see how much you need to type. It does not +matter whether you use upper case or lower case when you type the +subtopic. You should not put any spaces at the end, or inside of the +item name, except for one space where a space appears in the item in +the menu. + + You can also use the @dfn{completion} feature to help enter the subtopic +name. If you type the Tab key after entering part of a name, it will +magically fill in more of the name---as much as follows uniquely from +what you have entered. + + If you move the cursor to one of the menu subtopic lines, then you do +not need to type the argument: you just type a Return, and it stands for +the subtopic of the line you are on. + +Here is a menu to give you a chance to practice. + +* Menu: The menu starts here. + +This menu gives you three ways of going to one place, Help-FOO. + +* Foo: Help-FOO. A node you can visit for fun.@* +* Bar: Help-FOO. Strange! two ways to get to the same place.@* +* Help-FOO:: And yet another!@* + + +>> Now type just an @kbd{m} and see what happens: + + Now you are ``inside'' an @kbd{m} command. Commands cannot be used +now; the next thing you will type must be the name of a subtopic. + + You can change your mind about doing the @kbd{m} by typing Control-g. + +>> Try that now; notice the bottom line clear. + +>> Then type another @kbd{m}. + +>> Now type @samp{BAR} item name. Do not type Return yet. + + While you are typing the item name, you can use the Delete key to +cancel one character at a time if you make a mistake. + +>> Type one to cancel the @samp{R}. You could type another @samp{R} to + replace it. You do not have to, since @samp{BA} is a valid abbreviation. + +>> Now you are ready to go. Type a @key{RET}. + + After visiting Help-FOO, you should return here. + +>> Type @kbd{n} to see more commands. + +@c If a menu appears at the end of this node, remove it. +@c It is an accident of the menu updating command. + +Here is another way to get to Help-FOO, a menu. You can ignore this +if you want, or else try it (but then please come back to here). + +@menu +* Help-FOO:: +@end menu + +@node Help-FOO, , , Help-M +@comment node-name, next, previous, up +@subsection The @kbd{u} command + + Congratulations! This is the node @samp{Help-FOO}. Unlike the other +nodes you have seen, this one has an @samp{Up}: @samp{Help-M}, the node you +just came from via the @kbd{m} command. This is the usual +convention---the nodes you reach from a menu have @samp{Up} nodes that lead +back to the menu. Menus move Down in the tree, and @samp{Up} moves Up. +@samp{Previous}, on the other hand, is usually used to ``stay on the same +level but go backwards'' + + You can go back to the node @samp{Help-M} by typing the command +@kbd{u} for ``Up''. That puts you at the @emph{front} of the +node---to get back to where you were reading you have to type +some @key{SPC}s. + +>> Now type @kbd{u} to move back up to @samp{Help-M}. + +@node Help-Adv, Help-Q, Help-M, Getting Started +@comment node-name, next, previous, up +@section Some advanced Info commands + + The course is almost over, so please stick with it to the end. + + If you have been moving around to different nodes and wish to +retrace your steps, the @kbd{l} command (@kbd{l} for @dfn{last}) will +do that, one node-step at a time. As you move from node to node, Info +records the nodes where you have been in a special history list. The +@kbd{l} command revisits nodes in the history list; each successive +@kbd{l} command moves one step back through the history. + + If you have been following directions, ad @kbd{l} command now will get +you back to @samp{Help-M}. Another @kbd{l} command would undo the +@kbd{u} and get you back to @samp{Help-FOO}. Another @kbd{l} would undo +the @kbd{m} and get you back to @samp{Help-M}. + +>> Try typing three @kbd{l}'s, pausing in between to see what each + @kbd{l} does. + +Then follow directions again and you will end up back here. + + Note the difference between @kbd{l} and @kbd{p}: @kbd{l} moves to +where @emph{you} last were, whereas @kbd{p} always moves to the node +which the header says is the @samp{Previous} node (from this node, to +@samp{Help-M}). + + The @samp{d} command gets you instantly to the Directory node. +This node, which is the first one you saw when you entered Info, +has a menu which leads (directly, or indirectly through other menus), +to all the nodes that exist. + +>> Try doing a @samp{d}, then do an @kbd{l} to return here (yes, + @emph{do} return). + + Sometimes, in Info documentation, you will see a cross reference. +Cross references look like this: @xref{Help-Cross, Cross}. That is a +real, live cross reference which is named @samp{Cross} and points at +the node named @samp{Help-Cross}. + + If you wish to follow a cross reference, you must use the @samp{f} +command. The @samp{f} must be followed by the cross reference name +(in this case, @samp{Cross}). While you enter the name, you can use the +Delete key to edit your input. If you change your mind about following +any reference, you can use @kbd{Control-g} to cancel the command. + + Completion is available in the @samp{f} command; you can complete among +all the cross reference names in the current node by typing a Tab. + +>> Type @samp{f}, followed by @samp{Cross}, and a @key{RET}. + + To get a list of all the cross references in the current node, you can +type @kbd{?} after an @samp{f}. The @samp{f} continues to await a +cross reference name even after printing the list, so if you don't +actually want to follow a reference, you should type a @kbd{Control-g} +to cancel the @samp{f}. + +>> Type "f?" to get a list of the cross references in this node. Then + type a @kbd{Control-g} and see how the @samp{f} gives up. + +>> Now type @kbd{n} to see the last node of the course. + +@c If a menu appears at the end of this node, remove it. +@c It is an accident of the menu updating command. + +@node Help-Cross, , , Help-Adv +@comment node-name, next, previous, up +@unnumberedsubsec The node reached by the cross reference in Info + + This is the node reached by the cross reference named @samp{Cross}. + + While this node is specifically intended to be reached by a cross +reference, most cross references lead to nodes that ``belong'' +someplace else far away in the structure of Info. So you cannot expect +the footnote to have a @samp{Next}, @samp{Previous} or @samp{Up} pointing back to +where you came from. In general, the @kbd{l} (el) command is the only +way to get back there. + +>> Type @kbd{l} to return to the node where the cross reference was. + +@node Help-Q, , Help-Adv, Getting Started +@comment node-name, next, previous, up +@section Quitting Info + + To get out of Info, back to what you were doing before, type @kbd{q} +for @dfn{Quit}. + + This is the end of the course on using Info. There are some other +commands that are meant for experienced users; they are useful, and you +can find them by looking in the directory node for documentation on +Info. Finding them will be a good exercise in using Info in the usual +manner. + +>> Type @samp{d} to go to the Info directory node; then type + @samp{mInfo} and Return, to get to the node about Info and + see what other help is available. + +@node Advanced Info, Create an Info File, Getting Started, Top +@comment node-name, next, previous, up +@chapter Info for Experts + +This chapter describes various advanced Info commands, and how to write +an Info as distinct from a Texinfo file. (However, in most cases, writing a +Texinfo file is better, since you can use it @emph{both} to generate an +Info file and to make a printed manual. @xref{Top,, Overview of +Texinfo, texinfo, Texinfo: The GNU Documentation Format}.) + +@menu +* Expert:: Advanced Info commands: g, s, e, and 1 - 5. +* Add:: Describes how to add new nodes to the hierarchy. + Also tells what nodes look like. +* Menus:: How to add to or create menus in Info nodes. +* Cross-refs:: How to add cross-references to Info nodes. +* Tags:: How to make tag tables for Info files. +* Checking:: Checking an Info File +* Emacs Info Variables:: Variables modifying the behavior of Emacs Info. +@end menu + +@node Expert, Add, , Advanced Info +@comment node-name, next, previous, up +@section Advanced Info Commands + +@kbd{g}, @kbd{s}, @kbd{1}, -- @kbd{9}, and @kbd{e} + +If you know a node's name, you can go there by typing @kbd{g}, the +name, and @key{RET}. Thus, @kbd{gTop@key{RET}} would go to the node +called @samp{Top} in this file (its directory node). +@kbd{gExpert@key{RET}} would come back here. + +Unlike @kbd{m}, @kbd{g} does not allow the use of abbreviations. + +To go to a node in another file, you can include the filename in the +node name by putting it at the front, in parentheses. Thus, +@kbd{g(dir)Top@key{RET}} would go to the Info Directory node, which is +node @samp{Top} in the file @file{dir}. + +The node name @samp{*} specifies the whole file. So you can look at +all of the current file by typing @kbd{g*@key{RET}} or all of any +other file with @kbd{g(FILENAME)@key{RET}}. + +The @kbd{s} command allows you to search a whole file for a string. +It switches to the next node if and when that is necessary. You +type @kbd{s} followed by the string to search for, terminated by +@key{RET}. To search for the same string again, just @kbd{s} followed +by @key{RET} will do. The file's nodes are scanned in the order +they are in in the file, which has no necessary relationship to the +order that they may be in in the tree structure of menus and @samp{next} pointers. +But normally the two orders are not very different. In any case, +you can always do a @kbd{b} to find out what node you have reached, if +the header is not visible (this can happen, because @kbd{s} puts your +cursor at the occurrence of the string, not at the beginning of the +node). + +If you grudge the system each character of type-in it requires, you +might like to use the commands @kbd{1}, @kbd{2}, @kbd{3}, @kbd{4}, ... +@kbd{9}. They are short for the @kbd{m} command together with an +argument. @kbd{1} goes through the first item in the current node's +menu; @kbd{2} goes through the second item, etc. + +If you display supports multiple fonts, and you are using Emacs' Info +mode to read Info files, the @samp{*} for the fifth menu item is +underlines, and so is the @samp{*} for the ninth item; these underlines +make it easy to see at a glance which number to use for an item. + +On ordinary terminals, you won't have underlining. If you need to +actually count items, it is better to use @kbd{m} instead, and specify +the name. + +The Info command @kbd{e} changes from Info mode to an ordinary +Emacs editing mode, so that you can edit the text of the current node. +Type @kbd{C-c C-c} to switch back to Info. The @kbd{e} command is allowed +only if the variable @code{Info-enable-edit} is non-@code{nil}. + +@node Add, Menus, Expert, Advanced Info +@comment node-name, next, previous, up +@section Adding a new node to Info + +To add a new topic to the list in the Info directory, you must: +@enumerate +@item +Create some nodes, in some file, to document that topic. +@item +Put that topic in the menu in the directory. @xref{Menus, Menu}. +@end enumerate + +Usually, the way to create the nodes is with Texinfo @pxref{Top,, Overview of +Texinfo, texinfo, Texinfo: The GNU Documentation Format}); this has the +advantage that you can also make a printed manual from them. However, +if hyou want to edit an Info file, here is how. + + The new node can live in an existing documentation file, or in a new +one. It must have a @key{^_} character before it (invisible to the +user; this node has one but you cannot see it), and it ends with either +a @key{^_}, a @key{^L}, or the end of file. Note: If you put in a +@key{^L} to end a new node, be sure that there is a @key{^_} after it +to start the next one, since @key{^L} cannot @emph{start} a node. +Also, a nicer way to make a node boundary be a page boundary as well +is to put a @key{^L} @emph{right after} the @key{^_}. + + The @key{^_} starting a node must be followed by a newline or a +@key{^L} newline, after which comes the node's header line. The +header line must give the node's name (by which Info finds it), +and state the names of the @samp{Next}, @samp{Previous}, and @samp{Up} nodes (if +there are any). As you can see, this node's @samp{Up} node is the node +@samp{Top}, which points at all the documentation for Info. The @samp{Next} +node is @samp{Menus}. + + The keywords @dfn{Node}, @dfn{Previous}, @dfn{Up}, and @dfn{Next}, +may appear in any order, anywhere in the header line, but the +recommended order is the one in this sentence. Each keyword must be +followed by a colon, spaces and tabs, and then the appropriate name. +The name may be terminated with a tab, a comma, or a newline. A space +does not end it; node names may contain spaces. The case of letters +in the names is insignificant. + + A node name has two forms. A node in the current file is named by +what appears after the @samp{Node: } in that node's first line. For +example, this node's name is @samp{Add}. A node in another file is +named by @samp{(@var{filename})@var{node-within-file}}, as in +@samp{(info)Add} for this node. If the file name starts with ``./'', +then it is relative to the current directory; otherwise, it is relative +starting from the standard Info file directory of your site. +The name @samp{(@var{filename})Top} can be abbreviated to just +@samp{(@var{filename})}. By convention, the name @samp{Top} is used for +the ``highest'' node in any single file---the node whose @samp{Up} points +out of the file. The Directory node is @file{(dir)}. The @samp{Top} node +of a document file listed in the Directory should have an @samp{Up: +(dir)} in it. + + The node name @kbd{*} is special: it refers to the entire file. +Thus, @kbd{g*} shows you the whole current file. The use of the +node @kbd{*} is to make it possible to make old-fashioned, +unstructured files into nodes of the tree. + + The @samp{Node:} name, in which a node states its own name, must not +contain a filename, since Info when searching for a node does not +expect one to be there. The @samp{Next}, @samp{Previous} and @samp{Up} names may +contain them. In this node, since the @samp{Up} node is in the same file, +it was not necessary to use one. + + Note that the nodes in this file have a file name in the header +line. The file names are ignored by Info, but they serve as comments +to help identify the node for the user. + +@node Menus, Cross-refs, Add, Advanced Info +@comment node-name, next, previous, up +@section How to Create Menus + + Any node in the Info hierarchy may have a @dfn{menu}---a list of subnodes. +The @kbd{m} command searches the current node's menu for the topic which it +reads from the terminal. + + A menu begins with a line starting with @samp{* Menu:}. The rest of the +line is a comment. After the starting line, every line that begins +with a @samp{* } lists a single topic. The name of the topic--the +argument that the user must give to the @kbd{m} command to select this +topic---comes right after the star and space, and is followed by a +colon, spaces and tabs, and the name of the node which discusses that +topic. The node name, like node names following @samp{Next}, @samp{Previous} +and @samp{Up}, may be terminated with a tab, comma, or newline; it may also +be terminated with a period. + + If the node name and topic name are the same, then rather than +giving the name twice, the abbreviation @samp{* NAME::} may be used +(and should be used, whenever possible, as it reduces the visual +clutter in the menu). + + It is considerate to choose the topic names so that they differ +from each other very near the beginning---this allows the user to type +short abbreviations. In a long menu, it is a good idea to capitalize +the beginning of each item name which is the minimum acceptable +abbreviation for it (a long menu is more than 5 or so entries). + + The nodes listed in a node's menu are called its ``subnodes'', and +it is their ``superior''. They should each have an @samp{Up:} pointing at +the superior. It is often useful to arrange all or most of the +subnodes in a sequence of @samp{Next} and @samp{Previous} pointers so that someone who +wants to see them all need not keep revisiting the Menu. + + The Info Directory is simply the menu of the node @samp{(dir)Top}---that +is, node @samp{Top} in file @file{.../info/dir}. You can put new entries +in that menu just like any other menu. The Info Directory is @emph{not} the +same as the file directory called @file{info}. It happens that many of +Info's files live on that file directory, but they do not have to; and +files on that directory are not automatically listed in the Info +Directory node. + + Also, although the Info node graph is claimed to be a ``hierarchy'', +in fact it can be @emph{any} directed graph. Shared structures and +pointer cycles are perfectly possible, and can be used if they are +appropriate to the meaning to be expressed. There is no need for all +the nodes in a file to form a connected structure. In fact, this file +has two connected components. You are in one of them, which is under +the node @samp{Top}; the other contains the node @samp{Help} which the +@kbd{h} command goes to. In fact, since there is no garbage +collector, nothing terrible happens if a substructure is not pointed +to, but such a substructure is rather useless since nobody can +ever find out that it exists. + +@node Cross-refs, Tags, Menus, Advanced Info +@comment node-name, next, previous, up +@section Creating Cross References + + A cross reference can be placed anywhere in the text, unlike a menu +item which must go at the front of a line. A cross reference looks +like a menu item except that it has @samp{*note} instead of @kbd{*}. +It @emph{cannot} be terminated by a @samp{)}, because @samp{)}'s are +so often part of node names. If you wish to enclose a cross reference +in parentheses, terminate it with a period first. Here are two +examples of cross references pointers: + +@example +*Note details: commands. (See *note 3: Full Proof.) +@end example + +They are just examples. The places they ``lead to'' do not really exist! + +@node Tags, Checking, Cross-refs, Advanced Info +@comment node-name, next, previous, up +@section Tag Tables for Info Files + + You can speed up the access to nodes of a large Info file by giving +it a tag table. Unlike the tag table for a program, the tag table for +an Info file lives inside the file itself and is used +automatically whenever Info reads in the file. + + To make a tag table, go to a node in the file using Emacs Info mode and type +@kbd{M-x Info-tagify}. Then you must use @kbd{C-x C-s} to save the +file. + + Once the Info file has a tag table, you must make certain it is up +to date. If, as a result of deletion of text, any node moves back +more than a thousand characters in the file from the position +recorded in the tag table, Info will no longer be able to find that +node. To update the tag table, use the @code{Info-tagify} command again. + + An Info file tag table appears at the end of the file and looks like +this: + +@example +^_ +Tag Table: +File: info, Node: Cross-refs^?21419 +File: info, Node: Tags^?22145 +^_ +End Tag Table +@end example + +@noindent +Note that it contains one line per node, and this line contains +the beginning of the node's header (ending just after the node name), +a Delete character, and the character position in the file of the +beginning of the node. + +@node Checking, Emacs Info Variables, Tags, Advanced Info +@comment node-name, next, previous, up +@section Checking an Info File + + When creating an Info file, it is easy to forget the name of a node +when you are making a pointer to it from another node. If you put in +the wrong name for a node, this is not detected until someone +tries to go through the pointer using Info. Verification of the Info +file is an automatic process which checks all pointers to nodes and +reports any pointers which are invalid. Every @samp{Next}, @samp{Previous}, and +@samp{Up} is checked, as is every menu item and every cross reference. In +addition, any @samp{Next} which does not have a @samp{Previous} pointing back is +reported. Only pointers within the file are checked, because checking +pointers to other files would be terribly slow. But those are usually +few. + + To check an Info file, do @kbd{M-x Info-validate} while looking at +any node of the file with Emacs Info mode. + +@node Emacs Info Variables, , Checking, Advanced Info +@section Emacs Info-mode Variables + +The following variables may modify the behaviour of Info-mode in Emacs; +you may wish to set one or several of these variables interactively, or +in your @file{~/.emacs} init file. @xref{Examining, Examining and Setting +Variables, Examining and Setting Variables, emacs, The GNU Emacs +Manual}. + +@vtable @code +@item Info-enable-edit +Set to @code{nil}, disables the @samp{e} (@code{Info-edit}) command. A +non-@code{nil} value enables it. @xref{Add, Edit}. + +@item Info-enable-active-nodes +When set to a non-@code{nil} value, allows Info to execute Lisp code +associated with nodes. The Lisp code is executed when the node is +selected. + +@item Info-directory-list +The list of directories to search for Info files. Each element is a +string (directory name) or @code{nil} (try default directory). + +@item Info-directory +The standard directory for Info documentation files. Only used when the +function @code{Info-directory} is called. +@end vtable + +@node Create an Info File, , Advanced Info, Top +@comment node-name, next, previous, up +@chapter Creating an Info File from a Makeinfo file + +@code{makeinfo} is a utility that converts a Texinfo file into an Info +file; @code{texinfo-format-region} and @code{texinfo-format-buffer} are +GNU Emacs functions that do the same. + +@xref{Create an Info File, , Creating an Info File, texinfo, the Texinfo +Manual}, to learn how to create an Info file from a Texinfo file. + +@xref{Top,, Overview of Texinfo, texinfo, Texinfo: The GNU Documentation +Format}, to learn how to write a Texinfo file. + +@bye
new file mode 100644 --- /dev/null +++ b/info/infodoc.c @@ -0,0 +1,771 @@ +/* infodoc.c -- Functions which build documentation nodes. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include "info.h" + +/* Normally we do not define HELP_NODE_GETS_REGENERATED because the + contents of the help node currently can never change once an info + session has been started. You should consider defining this in + the case that you place information about dynamic variables in the + help text. When that happens, the contents of the help node will + change dependent on the value of those variables, and the user will + expect to see those changes. */ +/* #define HELP_NODE_GETS_REGENERATED 1 */ + +/* **************************************************************** */ +/* */ +/* Info Help Windows */ +/* */ +/* **************************************************************** */ + +/* The name of the node used in the help window. */ +static char *info_help_nodename = "*Info Help*"; + +/* A node containing printed key bindings and their documentation. */ +static NODE *internal_info_help_node = (NODE *)NULL; + +/* A pointer to the contents of the help node. */ +static char *internal_info_help_node_contents = (char *)NULL; + +/* The static text which appears in the internal info help node. */ +static char *info_internal_help_text[] = { + "Basic Commands in Info Windows", + "******************************", + "", + " h Invoke the Info tutorial.", + "", + "Selecting other nodes:", + "----------------------", + " n Move to the \"next\" node of this node.", + " p Move to the \"previous\" node of this node.", + " u Move \"up\" from this node.", + " m Pick menu item specified by name.", + " Picking a menu item causes another node to be selected.", + " f Follow a cross reference. Reads name of reference.", + " l Move to the last node seen in this window.", + " d Move to the `directory' node. Equivalent to `g(DIR)'.", + "", + "Moving within a node:", + "---------------------", + " SPC Scroll forward a page.", + " DEL Scroll backward a page.", + " b Go to the beginning of this node.", + " e Go to the end of this node.", + "", + "\"Advanced\" commands:", + "--------------------", + " q Quit Info.", + " 1 Pick first item in node's menu.", + " 2-9 Pick second ... ninth item in node's menu.", + " 0 Pick last item in node's menu.", + " g Move to node specified by name.", + " You may include a filename as well, as in (FILENAME)NODENAME.", + " s Search through this Info file for a specified string,", + " and select the node in which the next occurrence is found.", + (char *)NULL +}; + +static char *where_is (), *where_is_internal (); + +void +dump_map_to_message_buffer (prefix, map) + char *prefix; + Keymap map; +{ + register int i; + + for (i = 0; i < 256; i++) + { + if (map[i].type == ISKMAP) + { + char *new_prefix, *keyname; + + keyname = pretty_keyname (i); + new_prefix = (char *) + xmalloc (3 + strlen (prefix) + strlen (keyname)); + sprintf (new_prefix, "%s%s%s ", prefix, *prefix ? " " : "", keyname); + + dump_map_to_message_buffer (new_prefix, (Keymap)map[i].function); + free (new_prefix); + } + else if (map[i].function) + { + register int last; + char *doc, *name; + + doc = function_documentation (map[i].function); + name = function_name (map[i].function); + + if (!*doc) + continue; + + /* Find out if there is a series of identical functions, as in + ea_insert (). */ + for (last = i + 1; last < 256; last++) + if ((map[last].type != ISFUNC) || + (map[last].function != map[i].function)) + break; + + if (last - 1 != i) + { + printf_to_message_buffer + ("%s%s .. ", prefix, pretty_keyname (i)); + printf_to_message_buffer + ("%s%s\t", prefix, pretty_keyname (last - 1)); + i = last - 1; + } + else + printf_to_message_buffer ("%s%s\t", prefix, pretty_keyname (i)); + +#if defined (NAMED_FUNCTIONS) + /* Print the name of the function, and some padding before the + documentation string is printed. */ + { + int length_so_far; + int desired_doc_start = 40; /* Must be multiple of 8. */ + + printf_to_message_buffer ("(%s)", name); + length_so_far = message_buffer_length_this_line (); + + if ((desired_doc_start + strlen (doc)) >= the_screen->width) + printf_to_message_buffer ("\n "); + else + { + while (length_so_far < desired_doc_start) + { + printf_to_message_buffer ("\t"); + length_so_far += character_width ('\t', length_so_far); + } + } + } +#endif /* NAMED_FUNCTIONS */ + printf_to_message_buffer ("%s\n", doc); + } + } +} + +/* How to create internal_info_help_node. */ +static void +create_internal_info_help_node () +{ + register int i; + char *contents = (char *)NULL; + NODE *node; + +#if !defined (HELP_NODE_GETS_REGENERATED) + if (internal_info_help_node_contents) + contents = internal_info_help_node_contents; +#endif /* !HELP_NODE_GETS_REGENERATED */ + + if (!contents) + { + int printed_one_mx = 0; + + initialize_message_buffer (); + + for (i = 0; info_internal_help_text[i]; i++) + printf_to_message_buffer ("%s\n", info_internal_help_text[i]); + + printf_to_message_buffer ("---------------------\n\n"); + printf_to_message_buffer ("The current search path is:\n"); + printf_to_message_buffer (" \"%s\"\n", infopath); + printf_to_message_buffer ("---------------------\n\n"); + printf_to_message_buffer ("Commands available in Info windows:\n\n"); + dump_map_to_message_buffer ("", info_keymap); + printf_to_message_buffer ("---------------------\n\n"); + printf_to_message_buffer ("Commands available in the echo area:\n\n"); + dump_map_to_message_buffer ("", echo_area_keymap); + +#if defined (NAMED_FUNCTIONS) + /* Get a list of the M-x commands which have no keystroke equivs. */ + for (i = 0; function_doc_array[i].func; i++) + { + VFunction *func = function_doc_array[i].func; + + if ((!where_is_internal (info_keymap, func)) && + (!where_is_internal (echo_area_keymap, func))) + { + if (!printed_one_mx) + { + printf_to_message_buffer ("---------------------\n\n"); + printf_to_message_buffer + ("The following commands can only be invoked via M-x:\n\n"); + printed_one_mx = 1; + } + + printf_to_message_buffer + ("M-x %s\n %s\n", + function_doc_array[i].func_name, + replace_in_documentation (function_doc_array[i].doc)); + } + } + + if (printed_one_mx) + printf_to_message_buffer ("\n"); +#endif /* NAMED_FUNCTIONS */ + + printf_to_message_buffer + ("%s", replace_in_documentation + ("--- Use `\\[history-node]' or `\\[kill-node]' to exit ---\n")); + node = message_buffer_to_node (); + internal_info_help_node_contents = node->contents; + } + else + { + /* We already had the right contents, so simply use them. */ + node = build_message_node ("", 0, 0); + free (node->contents); + node->contents = contents; + node->nodelen = 1 + strlen (contents); + } + + internal_info_help_node = node; + + /* Do not GC this node's contents. It never changes, and we never need + to delete it once it is made. If you change some things (such as + placing information about dynamic variables in the help text) then + you will need to allow the contents to be gc'd, and you will have to + arrange to always regenerate the help node. */ +#if defined (HELP_NODE_GETS_REGENERATED) + add_gcable_pointer (internal_info_help_node->contents); +#endif + + name_internal_node (internal_info_help_node, info_help_nodename); + + /* Even though this is an internal node, we don't want the window + system to treat it specially. So we turn off the internalness + of it here. */ + internal_info_help_node->flags &= ~N_IsInternal; +} + +/* Return a window which is the window showing help in this Info. */ +static WINDOW * +info_find_or_create_help_window () +{ + WINDOW *help_window, *eligible, *window; + + eligible = (WINDOW *)NULL; + help_window = get_internal_info_window (info_help_nodename); + + /* If we couldn't find the help window, then make it. */ + if (!help_window) + { + int max = 0; + + for (window = windows; window; window = window->next) + { + if (window->height > max) + { + max = window->height; + eligible = window; + } + } + + if (!eligible) + return ((WINDOW *)NULL); + } +#if !defined (HELP_NODE_GETS_REGENERATED) + else + return (help_window); +#endif /* !HELP_NODE_GETS_REGENERATED */ + + /* Make sure that we have a node containing the help text. */ + create_internal_info_help_node (); + + /* Either use the existing window to display the help node, or create + a new window if there was no existing help window. */ + if (!help_window) + { + /* Split the largest window into 2 windows, and show the help text + in that window. */ + if (eligible->height > 30) + { + active_window = eligible; + help_window = window_make_window (internal_info_help_node); + } + else + { + set_remembered_pagetop_and_point (active_window); + window_set_node_of_window (active_window, internal_info_help_node); + help_window = active_window; + } + } + else + { + /* Case where help node always gets regenerated, and we have an + existing window in which to place the node. */ + if (active_window != help_window) + { + set_remembered_pagetop_and_point (active_window); + active_window = help_window; + } + window_set_node_of_window (active_window, internal_info_help_node); + } + remember_window_and_node (help_window, help_window->node); + return (help_window); +} + +/* Create or move to the help window. */ +DECLARE_INFO_COMMAND (info_get_help_window, "Display help message") +{ + WINDOW *help_window; + + help_window = info_find_or_create_help_window (); + if (help_window) + { + active_window = help_window; + active_window->flags |= W_UpdateWindow; + } + else + { + info_error (CANT_MAKE_HELP); + } +} + +/* Show the Info help node. This means that the "info" file is installed + where it can easily be found on your system. */ +DECLARE_INFO_COMMAND (info_get_info_help_node, "Visit Info node `(info)Help'") +{ + NODE *node; + char *nodename; + + /* If there is a window on the screen showing the node "(info)Help" or + the node "(info)Help-Small-Screen", simply select that window. */ + { + WINDOW *win; + + for (win = windows; win; win = win->next) + { + if (win->node && win->node->filename && + (strcasecmp + (filename_non_directory (win->node->filename), "info") == 0) && + ((strcmp (win->node->nodename, "Help") == 0) || + (strcmp (win->node->nodename, "Help-Small-Screen") == 0))) + { + active_window = win; + return; + } + } + } + + /* If the current window is small, show the small screen help. */ + if (active_window->height < 24) + nodename = "Help-Small-Screen"; + else + nodename = "Help"; + + /* Try to get the info file for Info. */ + node = info_get_node ("Info", nodename); + + if (!node) + { + if (info_recent_file_error) + info_error (info_recent_file_error); + else + info_error (CANT_FILE_NODE, "Info", nodename); + } + else + { + /* If the current window is very large (greater than 45 lines), + then split it and show the help node in another window. + Otherwise, use the current window. */ + + if (active_window->height > 45) + active_window = window_make_window (node); + else + { + set_remembered_pagetop_and_point (active_window); + window_set_node_of_window (active_window, node); + } + + remember_window_and_node (active_window, node); + } +} + +/* **************************************************************** */ +/* */ +/* Groveling Info Keymaps and Docs */ +/* */ +/* **************************************************************** */ + +/* Return the documentation associated with the Info command FUNCTION. */ +char * +function_documentation (function) + VFunction *function; +{ + register int i; + + for (i = 0; function_doc_array[i].func; i++) + if (function == function_doc_array[i].func) + break; + + return (replace_in_documentation (function_doc_array[i].doc)); +} + +#if defined (NAMED_FUNCTIONS) +/* Return the user-visible name of the function associated with the + Info command FUNCTION. */ +char * +function_name (function) + + VFunction *function; +{ + register int i; + + for (i = 0; function_doc_array[i].func; i++) + if (function == function_doc_array[i].func) + break; + + return (function_doc_array[i].func_name); +} + +/* Return a pointer to the function named NAME. */ +VFunction * +named_function (name) + char *name; +{ + register int i; + + for (i = 0; function_doc_array[i].func; i++) + if (strcmp (function_doc_array[i].func_name, name) == 0) + break; + + return (function_doc_array[i].func); +} +#endif /* NAMED_FUNCTIONS */ + +/* Return the documentation associated with KEY in MAP. */ +char * +key_documentation (key, map) + char key; + Keymap map; +{ + VFunction *function = map[key].function; + + if (function) + return (function_documentation (function)); + else + return ((char *)NULL); +} + +DECLARE_INFO_COMMAND (describe_key, "Print documentation for KEY") +{ + char keyname[50]; + int keyname_index = 0; + unsigned char keystroke; + char *rep; + Keymap map; + + keyname[0] = '\0'; + map = window->keymap; + + while (1) + { + message_in_echo_area ("Describe key: %s", keyname); + keystroke = info_get_input_char (); + unmessage_in_echo_area (); + + if (Meta_p (keystroke) && (!ISO_Latin_p || key < 160)) + { + if (map[ESC].type != ISKMAP) + { + window_message_in_echo_area + ("ESC %s is undefined.", pretty_keyname (UnMeta (keystroke))); + return; + } + + strcpy (keyname + keyname_index, "ESC "); + keyname_index = strlen (keyname); + keystroke = UnMeta (keystroke); + map = (Keymap)map[ESC].function; + } + + /* Add the printed representation of KEYSTROKE to our keyname. */ + rep = pretty_keyname (keystroke); + strcpy (keyname + keyname_index, rep); + keyname_index = strlen (keyname); + + if (map[keystroke].function == (VFunction *)NULL) + { + message_in_echo_area ("%s is undefined.", keyname); + return; + } + else if (map[keystroke].type == ISKMAP) + { + map = (Keymap)map[keystroke].function; + strcat (keyname, " "); + keyname_index = strlen (keyname); + continue; + } + else + { + char *message, *fundoc, *funname = ""; + +#if defined (NAMED_FUNCTIONS) + funname = function_name (map[keystroke].function); +#endif /* NAMED_FUNCTIONS */ + + fundoc = function_documentation (map[keystroke].function); + + message = (char *)xmalloc + (10 + strlen (keyname) + strlen (fundoc) + strlen (funname)); + +#if defined (NAMED_FUNCTIONS) + sprintf (message, "%s (%s): %s.", keyname, funname, fundoc); +#else + sprintf (message, "%s is defined to %s.", keyname, fundoc); +#endif /* !NAMED_FUNCTIONS */ + + window_message_in_echo_area ("%s", message); + free (message); + break; + } + } +} + +/* How to get the pretty printable name of a character. */ +static char rep_buffer[30]; + +char * +pretty_keyname (key) + unsigned char key; +{ + char *rep; + + if (Meta_p (key)) + { + char temp[20]; + + rep = pretty_keyname (UnMeta (key)); + + sprintf (temp, "ESC %s", rep); + strcpy (rep_buffer, temp); + rep = rep_buffer; + } + else if (Control_p (key)) + { + switch (key) + { + case '\n': rep = "LFD"; break; + case '\t': rep = "TAB"; break; + case '\r': rep = "RET"; break; + case ESC: rep = "ESC"; break; + + default: + sprintf (rep_buffer, "C-%c", UnControl (key)); + rep = rep_buffer; + } + } + else + { + switch (key) + { + case ' ': rep = "SPC"; break; + case DEL: rep = "DEL"; break; + default: + rep_buffer[0] = key; + rep_buffer[1] = '\0'; + rep = rep_buffer; + } + } + return (rep); +} + +/* Replace the names of functions with the key that invokes them. */ +char * +replace_in_documentation (string) + char *string; +{ + register int i, start, next; + static char *result = (char *)NULL; + + maybe_free (result); + result = (char *)xmalloc (1 + strlen (string)); + + i = next = start = 0; + + /* Skip to the beginning of a replaceable function. */ + for (i = start; string[i]; i++) + { + /* Is this the start of a replaceable function name? */ + if (string[i] == '\\' && string[i + 1] == '[') + { + char *fun_name, *rep; + VFunction *function; + + /* Copy in the old text. */ + strncpy (result + next, string + start, i - start); + next += (i - start); + start = i + 2; + + /* Move to the end of the function name. */ + for (i = start; string[i] && (string[i] != ']'); i++); + + fun_name = (char *)xmalloc (1 + i - start); + strncpy (fun_name, string + start, i - start); + fun_name[i - start] = '\0'; + + /* Find a key which invokes this function in the info_keymap. */ + function = named_function (fun_name); + + /* If the internal documentation string fails, there is a + serious problem with the associated command's documentation. + We croak so that it can be fixed immediately. */ + if (!function) + abort (); + + rep = where_is (info_keymap, function); + strcpy (result + next, rep); + next = strlen (result); + + start = i; + if (string[i]) + start++; + } + } + strcpy (result + next, string + start); + return (result); +} + +/* Return a string of characters which could be typed from the keymap + MAP to invoke FUNCTION. */ +static char *where_is_rep = (char *)NULL; +static int where_is_rep_index = 0; +static int where_is_rep_size = 0; + +static char * +where_is (map, function) + Keymap map; + VFunction *function; +{ + char *rep; + + if (!where_is_rep_size) + where_is_rep = (char *)xmalloc (where_is_rep_size = 100); + where_is_rep_index = 0; + + rep = where_is_internal (map, function); + + /* If it couldn't be found, return "M-x Foo". */ + if (!rep) + { + char *name; + + name = function_name (function); + + if (name) + sprintf (where_is_rep, "M-x %s", name); + + rep = where_is_rep; + } + return (rep); +} + +/* Return the printed rep of FUNCTION as found in MAP, or NULL. */ +static char * +where_is_internal (map, function) + Keymap map; + VFunction *function; +{ + register int i; + + /* If the function is directly invokable in MAP, return the representation + of that keystroke. */ + for (i = 0; i < 256; i++) + if ((map[i].type == ISFUNC) && map[i].function == function) + { + sprintf (where_is_rep + where_is_rep_index, "%s", pretty_keyname (i)); + return (where_is_rep); + } + + /* Okay, search subsequent maps for this function. */ + for (i = 0; i < 256; i++) + { + if (map[i].type == ISKMAP) + { + int saved_index = where_is_rep_index; + char *rep; + + sprintf (where_is_rep + where_is_rep_index, "%s ", + pretty_keyname (i)); + + where_is_rep_index = strlen (where_is_rep); + rep = where_is_internal ((Keymap)map[i].function, function); + + if (rep) + return (where_is_rep); + + where_is_rep_index = saved_index; + } + } + + return ((char *)NULL); +} + +extern char *read_function_name (); + +DECLARE_INFO_COMMAND (info_where_is, + "Show what to type to execute a given command") +{ + char *command_name; + + command_name = read_function_name ("Where is command: ", window); + + if (!command_name) + { + info_abort_key (active_window, count, key); + return; + } + + if (*command_name) + { + VFunction *function; + + function = named_function (command_name); + + if (function) + { + char *location; + + location = where_is (active_window->keymap, function); + + if (!location) + { + info_error ("`%s' is not on any keys", command_name); + } + else + { + if (strncmp (location, "M-x ", 4) == 0) + window_message_in_echo_area + ("%s can only be invoked via %s.", command_name, location); + else + window_message_in_echo_area + ("%s can be invoked via %s.", command_name, location); + } + } + else + info_error ("There is no function named `%s'", command_name); + } + + free (command_name); +}
new file mode 100644 --- /dev/null +++ b/info/infomap.c @@ -0,0 +1,274 @@ +/* infomap.c -- Keymaps for Info. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include "stdio.h" +#include "ctype.h" +#include "infomap.h" +#include "funs.h" + +/* Return a new keymap which has all the uppercase letters mapped to run + the function info_do_lowercase_version (). */ +Keymap +keymap_make_keymap () +{ + register int i; + Keymap keymap; + + keymap = (Keymap)xmalloc (256 * sizeof (KEYMAP_ENTRY)); + + for (i = 0; i < 256; i++) + { + keymap[i].type = ISFUNC; + keymap[i].function = (VFunction *)NULL; + } + + for (i = 'A'; i < ('Z' + 1); i++) + { + keymap[i].type = ISFUNC; + keymap[i].function = info_do_lowercase_version; + } + + return (keymap); +} + +/* Return a new keymap which is a copy of MAP. */ +Keymap +keymap_copy_keymap (map) + Keymap map; +{ + register int i; + Keymap keymap; + + keymap = keymap_make_keymap (); + + for (i = 0; i < 256; i++) + { + keymap[i].type = map[i].type; + keymap[i].function = map[i].function; + } + return (keymap); +} + +/* Free the keymap and it's descendents. */ +void +keymap_discard_keymap (map) + Keymap (map); +{ + register int i; + + if (!map) + return; + + for (i = 0; i < 256; i++) + { + switch (map[i].type) + { + case ISFUNC: + break; + + case ISKMAP: + keymap_discard_keymap ((Keymap)map[i].function); + break; + + } + } +} + +/* Initialize the standard info keymaps. */ + +Keymap info_keymap = (Keymap)NULL; +Keymap echo_area_keymap = (Keymap)NULL; + +void +initialize_info_keymaps () +{ + register int i; + Keymap map; + + if (!info_keymap) + { + info_keymap = keymap_make_keymap (); + info_keymap[ESC].type = ISKMAP; + info_keymap[ESC].function = (VFunction *)keymap_make_keymap (); + info_keymap[Control ('x')].type = ISKMAP; + info_keymap[Control ('x')].function = (VFunction *)keymap_make_keymap (); + echo_area_keymap = keymap_make_keymap (); + echo_area_keymap[ESC].type = ISKMAP; + echo_area_keymap[ESC].function = (VFunction *)keymap_make_keymap (); + echo_area_keymap[Control ('x')].type = ISKMAP; + echo_area_keymap[Control ('x')].function = + (VFunction *)keymap_make_keymap (); + } + + /* Bind numeric arg functions for both echo area and info window maps. */ + for (i = '0'; i < '9' + 1; i++) + { + ((Keymap) info_keymap[ESC].function)[i].function = + ((Keymap) echo_area_keymap[ESC].function)[i].function = + info_add_digit_to_numeric_arg; + } + ((Keymap) info_keymap[ESC].function)['-'].function = + ((Keymap) echo_area_keymap[ESC].function)['-'].function = + info_add_digit_to_numeric_arg; + + /* Bind the echo area routines. */ + map = echo_area_keymap; + + /* Bind the echo area insert routines. */ + for (i = 0; i < 160; i++) + if (isprint (i)) + map[i].function = ea_insert; + + map[Control ('a')].function = ea_beg_of_line; + map[Control ('b')].function = ea_backward; + map[Control ('d')].function = ea_delete; + map[Control ('e')].function = ea_end_of_line; + map[Control ('f')].function = ea_forward; + map[Control ('g')].function = ea_abort; + map[Control ('h')].function = ea_rubout; + map[Control ('k')].function = ea_kill_line; + map[Control ('l')].function = info_redraw_display; + map[Control ('q')].function = ea_quoted_insert; + map[Control ('t')].function = ea_transpose_chars; + map[Control ('u')].function = info_universal_argument; + map[Control ('y')].function = ea_yank; + + map[LFD].function = ea_newline; + map[RET].function = ea_newline; + map[SPC].function = ea_complete; + map[TAB].function = ea_complete; + map['?'].function = ea_possible_completions; + map[DEL].function = ea_rubout; + + /* Bind the echo area ESC keymap. */ + map = (Keymap)echo_area_keymap[ESC].function; + + map[Control ('g')].function = ea_abort; + map[Control ('v')].function = ea_scroll_completions_window; + map['b'].function = ea_backward_word; + map['d'].function = ea_kill_word; + map['f'].function = ea_forward_word; +#if defined (NAMED_FUNCTIONS) + /* map['x'].function = info_execute_command; */ +#endif /* NAMED_FUNCTIONS */ + map['y'].function = ea_yank_pop; + map['?'].function = ea_possible_completions; + map[TAB].function = ea_tab_insert; + map[DEL].function = ea_backward_kill_word; + + /* Bind the echo area Control-x keymap. */ + map = (Keymap)echo_area_keymap[Control ('x')].function; + + map['o'].function = info_next_window; + map[DEL].function = ea_backward_kill_line; + + /* Bind commands for Info window keymaps. */ + map = info_keymap; + map[TAB].function = info_move_to_next_xref; + map[LFD].function = info_select_reference_this_line; + map[RET].function = info_select_reference_this_line; + map[SPC].function = info_scroll_forward; + map[Control ('a')].function = info_beginning_of_line; + map[Control ('b')].function = info_backward_char; + map[Control ('e')].function = info_end_of_line; + map[Control ('f')].function = info_forward_char; + map[Control ('g')].function = info_abort_key; + map[Control ('h')].function = info_get_help_window; + map[Control ('l')].function = info_redraw_display; + map[Control ('n')].function = info_next_line; + map[Control ('p')].function = info_prev_line; + map[Control ('r')].function = isearch_backward; + map[Control ('s')].function = isearch_forward; + map[Control ('u')].function = info_universal_argument; + map[Control ('v')].function = info_scroll_forward; + map[','].function = info_next_index_match; + + for (i = '1'; i < '9' + 1; i++) + map[i].function = info_menu_digit; + map['0'].function = info_last_menu_item; + + map['<'].function = info_first_node; + map['>'].function = info_last_node; + map['?'].function = info_get_help_window; + map['['].function = info_global_prev_node; + map[']'].function = info_global_next_node; + + map['b'].function = info_beginning_of_node; + map['d'].function = info_dir_node; + map['e'].function = info_end_of_node; + map['f'].function = info_xref_item; + map['g'].function = info_goto_node; + map['h'].function = info_get_info_help_node; + map['i'].function = info_index_search; + map['l'].function = info_history_node; + map['m'].function = info_menu_item; + map['n'].function = info_next_node; + map['p'].function = info_prev_node; + map['q'].function = info_quit; + map['r'].function = info_xref_item; + map['s'].function = info_search; + map['t'].function = info_top_node; + map['u'].function = info_up_node; + map[DEL].function = info_scroll_backward; + + /* Bind members in the ESC map for Info windows. */ + map = (Keymap)info_keymap[ESC].function; + map[Control ('f')].function = info_show_footnotes; + map[Control ('g')].function = info_abort_key; + map[TAB].function = info_move_to_prev_xref; + map[Control ('v')].function = info_scroll_other_window; + map['<'].function = info_beginning_of_node; + map['>'].function = info_end_of_node; + map['b'].function = info_backward_word; + map['f'].function = info_forward_word; + map['r'].function = info_move_to_window_line; + map['v'].function = info_scroll_backward; +#if defined (NAMED_FUNCTIONS) + map['x'].function = info_execute_command; +#endif /* NAMED_FUNCTIONS */ + + /* Bind members in the Control-X map for Info windows. */ + map = (Keymap)info_keymap[Control ('x')].function; + + map[Control ('b')].function = list_visited_nodes; + map[Control ('c')].function = info_quit; + map[Control ('f')].function = info_view_file; + map[Control ('g')].function = info_abort_key; + map[Control ('v')].function = info_view_file; + map['0'].function = info_delete_window; + map['1'].function = info_keep_one_window; + map['2'].function = info_split_window; + map['^'].function = info_grow_window; + map['b'].function = select_visited_node; + map['k'].function = info_kill_node; + map['o'].function = info_next_window; + map['t'].function = info_tile_windows; + map['w'].function = info_toggle_wrap; +} + +/* Strings which represent the sequence of characters that the arrow keys + produce. If these keys begin with ESC, and the second character of the + sequence does not conflict with an existing binding in the Meta keymap, + then bind the keys to do what C-p, C-n, C-f, and C-b do. */ +extern char *term_ku, *term_kd, *term_kr, *term_kl; +
new file mode 100644 --- /dev/null +++ b/info/infomap.h @@ -0,0 +1,82 @@ +/* infomap.h -- Description of a keymap in Info and related functions. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_INFOMAP_H_) +#define _INFOMAP_H_ + +#include "general.h" + +#define ESC '\033' +#define DEL '\177' +#define TAB '\011' +#define RET '\r' +#define LFD '\n' +#define SPC ' ' + +#define meta_character_threshold (DEL + 1) +#define control_character_threshold (SPC) + +#define meta_character_bit 0x80 +#define control_character_bit 0x40 + +#define Meta_p(c) (((c) > meta_character_threshold)) +#define Control_p(c) ((c) < control_character_threshold) + +#define Meta(c) ((c) | (meta_character_bit)) +#define UnMeta(c) ((c) & (~meta_character_bit)) +#define Control(c) ((toupper (c)) & (~control_character_bit)) +#define UnControl(c) (tolower ((c) | control_character_bit)) + +/* A keymap contains one entry for each key in the ASCII set. + Each entry consists of a type and a pointer. + FUNCTION is the address of a function to run, or the + address of a keymap to indirect through. + TYPE says which kind of thing FUNCTION is. */ +typedef struct { + char type; + VFunction *function; +} KEYMAP_ENTRY; + +typedef KEYMAP_ENTRY *Keymap; + +/* The values that TYPE can have in a keymap entry. */ +#define ISFUNC 0 +#define ISKMAP 1 + +extern Keymap info_keymap; +extern Keymap echo_area_keymap; + +/* Return a new keymap which has all the uppercase letters mapped to run + the function info_do_lowercase_version (). */ +extern Keymap keymap_make_keymap (); + +/* Return a new keymap which is a copy of MAP. */ +extern Keymap keymap_copy_keymap (); + +/* Free MAP and it's descendents. */ +extern void keymap_discard_keymap (); + +/* Initialize the info keymaps. */ +extern void initialize_info_keymaps (); + +#endif /* !_INFOMAP_H_ */
new file mode 100644 --- /dev/null +++ b/info/m-x.c @@ -0,0 +1,195 @@ +/* m-x.c -- Meta-X minibuffer reader. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include "info.h" + +/* **************************************************************** */ +/* */ +/* Reading Named Commands */ +/* */ +/* **************************************************************** */ + +/* Read the name of an Info function in the echo area and return the + name. A return value of NULL indicates that no function name could + be read. */ +char * +read_function_name (prompt, window) + char *prompt; + WINDOW *window; +{ + register int i; + char *line; + REFERENCE **array = (REFERENCE **)NULL; + int array_index = 0, array_slots = 0; + + /* Make an array of REFERENCE which actually contains the names of + the functions available in Info. */ + for (i = 0; function_doc_array[i].func; i++) + { + REFERENCE *entry; + + entry = (REFERENCE *)xmalloc (sizeof (REFERENCE)); + entry->label = strdup (function_doc_array[i].func_name); + entry->nodename = (char *)NULL; + entry->filename = (char *)NULL; + + add_pointer_to_array + (entry, array_index, array, array_slots, 200, REFERENCE *); + } + + line = info_read_completing_in_echo_area (window, prompt, array); + + info_free_references (array); + + if (!echo_area_is_active) + window_clear_echo_area (); + + return (line); +} + +DECLARE_INFO_COMMAND (describe_command, + "Read the name of an Info command and describe it") +{ + char *line; + + line = read_function_name ("Describe command: ", window); + + if (!line) + { + info_abort_key (active_window, count, key); + return; + } + + /* Describe the function named in "LINE". */ + if (*line) + { + char *fundoc; + VFunction *fun; + + fun = named_function (line); + + if (!fun) + return; + + window_message_in_echo_area ("%s: %s.", + line, function_documentation (fun)); + } + free (line); +} + +DECLARE_INFO_COMMAND (info_execute_command, + "Read a command name in the echo area and execute it") +{ + char *line; + + /* Ask the completer to read a reference for us. */ + if (info_explicit_arg || count != 1) + { + char *prompt; + + prompt = (char *)xmalloc (20); + sprintf (prompt, "%d M-x ", count); + line = read_function_name (prompt, window); + } + else + line = read_function_name ("M-x ", window); + + /* User aborted? */ + if (!line) + { + info_abort_key (active_window, count, key); + return; + } + + /* User accepted "default"? (There is none.) */ + if (!*line) + { + free (line); + return; + } + + /* User wants to execute a named command. Do it. */ + { + VFunction *function; + + if ((active_window != the_echo_area) && + (strncmp (line, "echo-area-", 10) == 0)) + { + free (line); + info_error ("Cannot execute an `echo-area' command here."); + return; + } + + function = named_function (line); + free (line); + + if (!function) + return; + + (*function) (active_window, count, 0); + } +} + +/* Okay, now that we have M-x, let the user set the screen height. */ +DECLARE_INFO_COMMAND (set_screen_height, + "Set the height of the displayed window") +{ + int new_height; + + if (info_explicit_arg || count != 1) + new_height = count; + else + { + char prompt[80]; + char *line; + + new_height = screenheight; + + sprintf (prompt, "Set screen height to (%d): ", new_height); + + line = info_read_in_echo_area (window, prompt); + + /* If the user aborted, do that now. */ + if (!line) + { + info_abort_key (active_window, count, 0); + return; + } + + /* Find out what the new height is supposed to be. */ + if (*line) + new_height = atoi (line); + + /* Clear the echo area if it isn't active. */ + if (!echo_area_is_active) + window_clear_echo_area (); + + free (line); + } + + terminal_clear_screen (); + display_clear_display (the_display); + screenheight = new_height; + display_initialize_display (screenwidth, screenheight); + window_new_screen_size (screenwidth, screenheight); +}
new file mode 100644 --- /dev/null +++ b/info/makedoc.c @@ -0,0 +1,481 @@ +/* makedoc.c -- Make DOC.C and FUNS.H from input files. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +/* This program grovels the contents of the source files passed as arguments + and writes out a file of function pointers and documentation strings, and + a header file which describes the contents. This only does the functions + declared with DECLARE_INFO_COMMAND. */ + +#include <stdio.h> +#include <ctype.h> +#include <sys/types.h> +#if defined (HAVE_SYS_FILE_H) +#include <sys/file.h> +#endif /* HAVE_SYS_FILE_H */ +#include <sys/stat.h> +#include "general.h" + +#if !defined (O_RDONLY) +#if defined (HAVE_SYS_FCNTL_H) +#include <sys/fcntl.h> +#else /* !HAVE_SYS_FCNTL_H */ +#include <fcntl.h> +#endif /* !HAVE_SYS_FCNTL_H */ +#endif /* !O_RDONLY */ + +extern void *xmalloc (), *xrealloc (); +static void fatal_file_error (); + +/* Name of the header file which receives the declarations of functions. */ +static char *funs_filename = "funs.h"; + +/* Name of the documentation to function pointer file. */ +static char *doc_filename = "doc.c"; + +static char *doc_header[] = { + "/* doc.c -- Generated structure containing function names and doc strings.", + "", + " This file was automatically made from various source files with the", + " command \"%s\". DO NOT EDIT THIS FILE, only \"%s.c\".", + (char *)NULL +}; + +static char *doc_header_1[] = { + " An entry in the array FUNCTION_DOC_ARRAY is made for each command", + " found in the above files; each entry consists of a function pointer,", +#if defined (NAMED_FUNCTIONS) + " a string which is the user-visible name of the function,", +#endif /* NAMED_FUNCTIONS */ + " and a string which documents its purpose. */", + "", + "#include \"doc.h\"", + "#include \"funs.h\"", + "", + "FUNCTION_DOC function_doc_array[] = {", + "", + (char *)NULL +}; + +/* How to remember the locations of the functions found so that Emacs + can use the information in a tag table. */ +typedef struct { + char *name; /* Name of the tag. */ + int line; /* Line number at which it appears. */ + long char_offset; /* Character offset at which it appears. */ +} EMACS_TAG; + +typedef struct { + char *filename; /* Name of the file containing entries. */ + long entrylen; /* Total number of characters in tag block. */ + EMACS_TAG **entries; /* Entries found in FILENAME. */ + int entries_index; + int entries_slots; +} EMACS_TAG_BLOCK; + +EMACS_TAG_BLOCK **emacs_tags = (EMACS_TAG_BLOCK **)NULL; +int emacs_tags_index = 0; +int emacs_tags_slots = 0; + +#define DECLARATION_STRING "\nDECLARE_INFO_COMMAND" + +static void process_one_file (); +static void maybe_dump_tags (); +static FILE *must_fopen (); + +int +main (argc, argv) + int argc; + char **argv; +{ + register int i; + int tags_only = 0; + FILE *funs_stream, *doc_stream; + + for (i = 1; i < argc; i++) + if (strcmp (argv[i], "-tags") == 0) + { + tags_only++; + break; + } + + if (tags_only) + { + funs_filename = "/dev/null"; + doc_filename = "/dev/null"; + } + + funs_stream = must_fopen (funs_filename, "w"); + doc_stream = must_fopen (doc_filename, "w"); + + fprintf (funs_stream, + "/* %s -- Generated declarations for Info commands. */\n", + funs_filename); + + for (i = 0; doc_header[i]; i++) + { + fprintf (doc_stream, doc_header[i], argv[0], argv[0]); + fprintf (doc_stream, "\n"); + } + + fprintf (doc_stream, + " Source files groveled to make this file include:\n\n"); + + for (i = 1; i < argc; i++) + fprintf (doc_stream, "\t%s\n", argv[i]); + + fprintf (doc_stream, "\n"); + + for (i = 0; doc_header_1[i]; i++) + fprintf (doc_stream, "%s\n", doc_header_1[i]); + + + for (i = 1; i < argc; i++) + { + char *curfile; + curfile = argv[i]; + + if (*curfile == '-') + continue; + + fprintf (doc_stream, "/* Commands found in \"%s\". */\n", curfile); + fprintf (funs_stream, "\n/* Functions declared in \"%s\". */\n", + curfile); + + process_one_file (curfile, doc_stream, funs_stream); + } + + fprintf (doc_stream, + " { (VFunction *)NULL, (char *)NULL, (char *)NULL }\n};\n"); + + fclose (funs_stream); + fclose (doc_stream); + + if (tags_only) + maybe_dump_tags (stdout); + exit (0); +} + +/* Dumping out the contents of an Emacs tags table. */ +static void +maybe_dump_tags (stream) + FILE *stream; +{ + register int i; + + /* Print out the information for each block. */ + for (i = 0; i < emacs_tags_index; i++) + { + register int j; + register EMACS_TAG_BLOCK *block; + register EMACS_TAG *etag; + long block_len; + + block_len = 0; + block = emacs_tags[i]; + + /* Calculate the length of the dumped block first. */ + for (j = 0; j < block->entries_index; j++) + { + char digits[30]; + etag = block->entries[j]; + block_len += 3 + strlen (etag->name); + sprintf (digits, "%d,%d", etag->line, etag->char_offset); + block_len += strlen (digits); + } + + /* Print out the defining line. */ + fprintf (stream, "\f\n%s,%d\n", block->filename, block_len); + + /* Print out the individual tags. */ + for (j = 0; j < block->entries_index; j++) + { + etag = block->entries[j]; + + fprintf (stream, "%s,\177%d,%d\n", + etag->name, etag->line, etag->char_offset); + } + } +} + +/* Keeping track of names, line numbers and character offsets of functions + found in source files. */ +static EMACS_TAG_BLOCK * +make_emacs_tag_block (filename) + char *filename; +{ + EMACS_TAG_BLOCK *block; + + block = (EMACS_TAG_BLOCK *)xmalloc (sizeof (EMACS_TAG_BLOCK)); + block->filename = strdup (filename); + block->entrylen = 0; + block->entries = (EMACS_TAG **)NULL; + block->entries_index = 0; + block->entries_slots = 0; + return (block); +} + +static void +add_tag_to_block (block, name, line, char_offset) + EMACS_TAG_BLOCK *block; + char *name; + int line; + long char_offset; +{ + EMACS_TAG *tag; + + tag = (EMACS_TAG *)xmalloc (sizeof (EMACS_TAG)); + tag->name = name; + tag->line = line; + tag->char_offset = char_offset; + add_pointer_to_array (tag, block->entries_index, block->entries, + block->entries_slots, 50, EMACS_TAG *); +} + +/* Read the file represented by FILENAME into core, and search it for Info + function declarations. Output the declarations in various forms to the + DOC_STREAM and FUNS_STREAM. */ +static void +process_one_file (filename, doc_stream, funs_stream) + char *filename; + FILE *doc_stream, *funs_stream; +{ + int descriptor, decl_len; + char *buffer, *decl_str; + struct stat finfo; + long offset; + long file_size; + EMACS_TAG_BLOCK *block; + + if (stat (filename, &finfo) == -1) + fatal_file_error (filename); + + descriptor = open (filename, O_RDONLY, 0666); + + if (descriptor == -1) + fatal_file_error (filename); + + file_size = (long) finfo.st_size; + buffer = (char *)xmalloc (1 + file_size); + read (descriptor, buffer, file_size); + close (descriptor); + + offset = 0; + decl_str = DECLARATION_STRING; + decl_len = strlen (decl_str); + + block = make_emacs_tag_block (filename); + + while (1) + { + long point = 0; + long line_start = 0; + int line_number = 0; + + char *func, *doc; +#if defined (NAMED_FUNCTIONS) + char *func_name; +#endif /* NAMED_FUNCTIONS */ + + for (; offset < (file_size - decl_len); offset++) + { + if (buffer[offset] == '\n') + { + line_number++; + line_start = offset + 1; + } + + if (strncmp (buffer + offset, decl_str, decl_len) == 0) + { + offset += decl_len; + point = offset; + break; + } + } + + if (!point) + break; + + /* Skip forward until we find the open paren. */ + while (point < file_size) + { + if (buffer[point] == '\n') + { + line_number++; + line_start = point + 1; + } + else if (buffer[point] == '(') + break; + + point++; + } + + while (point++ < file_size) + { + if (!whitespace_or_newline (buffer[point])) + break; + else if (buffer[point] == '\n') + { + line_number++; + line_start = point + 1; + } + } + + if (point >= file_size) + break; + + /* Now looking at name of function. Get it. */ + for (offset = point; buffer[offset] != ','; offset++); + func = (char *)xmalloc (1 + (offset - point)); + strncpy (func, buffer + point, offset - point); + func[offset - point] = '\0'; + + /* Remember this tag in the current block. */ + { + char *tag_name; + + tag_name = (char *)xmalloc (1 + (offset - line_start)); + strncpy (tag_name, buffer + line_start, offset - line_start); + tag_name[offset - line_start] = '\0'; + add_tag_to_block (block, tag_name, line_number, point); + } + +#if defined (NAMED_FUNCTIONS) + /* Generate the user-visible function name from the function's name. */ + { + register int i; + char *name_start; + + name_start = func; + + if (strncmp (name_start, "info_", 5) == 0) + name_start += 5; + + func_name = strdup (name_start); + + /* Fix up "ea" commands. */ + if (strncmp (func_name, "ea_", 3) == 0) + { + char *temp_func_name; + + temp_func_name = (char *)xmalloc (10 + strlen (func_name)); + strcpy (temp_func_name, "echo_area_"); + strcat (temp_func_name, func_name + 3); + free (func_name); + func_name = temp_func_name; + } + + for (i = 0; func_name[i]; i++) + if (func_name[i] == '_') + func_name[i] = '-'; + } +#endif /* NAMED_FUNCTIONS */ + + /* Find doc string. */ + point = offset + 1; + + while (point < file_size) + { + if (buffer[point] == '\n') + { + line_number++; + line_start = point + 1; + } + + if (buffer[point] == '"') + break; + else + point++; + } + + offset = point + 1; + + while (offset < file_size) + { + if (buffer[offset] == '\n') + { + line_number++; + line_start = offset + 1; + } + + if (buffer[offset] == '\\') + offset += 2; + else if (buffer[offset] == '"') + break; + else + offset++; + } + + offset++; + if (offset >= file_size) + break; + + doc = (char *)xmalloc (1 + (offset - point)); + strncpy (doc, buffer + point, offset - point); + doc[offset - point] = '\0'; + +#if defined (NAMED_FUNCTIONS) + fprintf (doc_stream, " { %s, \"%s\", %s },\n", func, func_name, doc); + free (func_name); +#else /* !NAMED_FUNCTIONS */ + fprintf (doc_stream, " { %s, %s },\n", func, doc); +#endif /* !NAMED_FUNCTIONS */ + + fprintf (funs_stream, "extern void %s ();\n", func); + free (func); + free (doc); + } + free (buffer); + + /* If we created any tags, remember this file on our global list. Otherwise, + free the memory already allocated to it. */ + if (block->entries) + add_pointer_to_array (block, emacs_tags_index, emacs_tags, + emacs_tags_slots, 10, EMACS_TAG_BLOCK *); + else + { + free (block->filename); + free (block); + } +} + +static void +fatal_file_error (filename) + char *filename; +{ + fprintf (stderr, "Couldn't manipulate the file %s.\n", filename); + exit (2); +} + +static FILE * +must_fopen (filename, mode) + char *filename, *mode; +{ + FILE *stream; + + stream = fopen (filename, mode); + if (!stream) + fatal_file_error (filename); + + return (stream); +} +
new file mode 100644 --- /dev/null +++ b/info/man.c @@ -0,0 +1,643 @@ +/* man.c: How to read and format man files. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1995 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox Thu May 4 09:17:52 1995 (bfox@ai.mit.edu). */ + +#include "info.h" +#include <sys/ioctl.h> +#include <sys/file.h> +#include "signals.h" +#if defined (HAVE_SYS_TIME_H) +#include <sys/time.h> +#endif +#if defined (HAVE_SYS_WAIT_H) +#include <sys/wait.h> +#endif +#include "tilde.h" + +#include "man.h" + +#if !defined (_POSIX_VERSION) +#define pid_t int +#endif + +#if defined (FD_SET) +# if defined (hpux) +# define fd_set_cast(x) (int *)(x) +# else +# define fd_set_cast(x) (fd_set *)(x) +# endif /* !hpux */ +#endif /* FD_SET */ + +static char *read_from_fd (); +static void clean_manpage (); +static NODE *manpage_node_of_file_buffer (); +static char *get_manpage_contents (); + +NODE * +make_manpage_node (pagename) + char *pagename; +{ + return (info_get_node (MANPAGE_FILE_BUFFER_NAME, pagename)); +} + +NODE * +get_manpage_node (file_buffer, pagename) + FILE_BUFFER *file_buffer; + char *pagename; +{ + NODE *node; + + node = manpage_node_of_file_buffer (file_buffer, pagename); + + if (!node) + { + char *page; + + page = get_manpage_contents (pagename); + + if (page) + { + char header[1024]; + long oldsize, newsize; + int hlen, plen; + + sprintf (header, "\n\n%c\n%s %s, %s %s, %s (dir)\n\n", + INFO_COOKIE, + INFO_FILE_LABEL, file_buffer->filename, + INFO_NODE_LABEL, pagename, + INFO_UP_LABEL); + oldsize = file_buffer->filesize; + hlen = strlen (header); + plen = strlen (page); + newsize = (oldsize + hlen + plen); + file_buffer->contents = + (char *)xrealloc (file_buffer->contents, 1 + newsize); + memcpy (file_buffer->contents + oldsize, header, hlen); + oldsize += hlen; + memcpy (file_buffer->contents + oldsize, page, plen); + file_buffer->contents[newsize] = '\0'; + file_buffer->filesize = newsize; + file_buffer->finfo.st_size = newsize; + build_tags_and_nodes (file_buffer); + free (page); + } + + node = manpage_node_of_file_buffer (file_buffer, pagename); + } + + return (node); +} + +FILE_BUFFER * +create_manpage_file_buffer () +{ + FILE_BUFFER *file_buffer; + struct stat *finfo; + + file_buffer = make_file_buffer (); + file_buffer->filename = strdup (MANPAGE_FILE_BUFFER_NAME); + file_buffer->fullpath = strdup (MANPAGE_FILE_BUFFER_NAME); + file_buffer->finfo.st_size = 0; + file_buffer->filesize = 0; + file_buffer->contents = (char *)NULL; + file_buffer->flags = (N_IsInternal | N_CannotGC | N_IsManPage); + + return (file_buffer); +} + +/* Scan the list of directories in PATH looking for FILENAME. If we find + one that is an executable file, return it as a new string. Otherwise, + return a NULL pointer. */ +static char * +executable_file_in_path (filename, path) + char *filename, *path; +{ + struct stat finfo; + char *temp_dirname; + int statable, dirname_index; + + dirname_index = 0; + + while (temp_dirname = extract_colon_unit (path, &dirname_index)) + { + register int i; + char *temp; + + /* Expand a leading tilde if one is present. */ + if (*temp_dirname == '~') + { + char *expanded_dirname; + + expanded_dirname = tilde_expand_word (temp_dirname); + free (temp_dirname); + temp_dirname = expanded_dirname; + } + + temp = (char *)xmalloc (30 + strlen (temp_dirname) + strlen (filename)); + strcpy (temp, temp_dirname); + if (temp[(strlen (temp)) - 1] != '/') + strcat (temp, "/"); + strcat (temp, filename); + + free (temp_dirname); + + statable = (stat (temp, &finfo) == 0); + + /* If we have found a regular executable file, then use it. */ + if ((statable) && (S_ISREG (finfo.st_mode)) && + (access (temp, X_OK) == 0)) + return (temp); + else + free (temp); + } + return ((char *)NULL); +} + +/* Return the full pathname of the system man page formatter. */ +static char * +find_man_formatter () +{ + return (executable_file_in_path ("man", (char *)getenv ("PATH"))); +} + +static char *manpage_pagename = (char *)NULL; +static char *manpage_section = (char *)NULL; + +static void +get_page_and_section (pagename) + char *pagename; +{ + register int i; + + if (manpage_pagename) + free (manpage_pagename); + + if (manpage_section) + free (manpage_section); + + manpage_pagename = (char *)NULL; + manpage_section = (char *)NULL; + + for (i = 0; pagename[i] != '\0' && pagename[i] != '('; i++); + + manpage_pagename = (char *)xmalloc (1 + i); + strncpy (manpage_pagename, pagename, i); + manpage_pagename[i] = '\0'; + + if (pagename[i] == '(') + { + int start; + + start = i + 1; + + for (i = start; pagename[i] != '\0' && pagename[i] != ')'; i++); + + manpage_section = (char *)xmalloc (1 + (i - start)); + strncpy (manpage_section, pagename + start, (i - start)); + manpage_section[i - start] = '\0'; + } +} + +static void +reap_children (sig) + int sig; +{ + unsigned int status; + wait (&status); +} + +static char * +get_manpage_contents (pagename) + char *pagename; +{ + static char *formatter_args[4] = { (char *)NULL }; + int pipes[2]; + pid_t child; + char *formatted_page = (char *)NULL; + char *section = (char *)NULL; + int arg_index = 1; + + if (formatter_args[0] == (char *)NULL) + formatter_args[0] = find_man_formatter (); + + if (formatter_args[0] == (char *)NULL) + return ((char *)NULL); + + get_page_and_section (pagename); + + if (manpage_section != (char *)NULL) + formatter_args[arg_index++] = manpage_section; + + formatter_args[arg_index++] = manpage_pagename; + formatter_args[arg_index] = (char *)NULL; + + /* Open a pipe to this program, read the output, and save it away + in FORMATTED_PAGE. The reader end of the pipe is pipes[0]; the + writer end is pipes[1]. */ + pipe (pipes); + + signal (SIGCHLD, reap_children); + + child = fork (); + + if (child == -1) + return ((char *)NULL); + + if (child != 0) + { + /* In the parent, close the writing end of the pipe, and read from + the exec'd child. */ + close (pipes[1]); + formatted_page = read_from_fd (pipes[0]); + close (pipes[0]); + } + else + { + /* In the child, close the read end of the pipe, make the write end + of the pipe be stdout, and execute the man page formatter. */ + close (pipes[0]); + close (fileno (stderr)); + close (fileno (stdin)); /* Don't print errors. */ + dup2 (pipes[1], fileno (stdout)); + + execv (formatter_args[0], formatter_args); + + /* If we get here, we couldn't exec, so close out the pipe and + exit. */ + close (pipes[1]); + exit (0); + } + + /* If we have the page, then clean it up. */ + if (formatted_page) + clean_manpage (formatted_page); + + return (formatted_page); +} + +static void +clean_manpage (manpage) + char *manpage; +{ + register int i, j; + int newline_count = 0; + char *newpage; + + newpage = (char *)xmalloc (1 + strlen (manpage)); + + for (i = 0, j = 0; newpage[j] = manpage[i]; i++, j++) + { + if (manpage[i] == '\n') + newline_count++; + else + newline_count = 0; + + if (newline_count == 3) + { + j--; + newline_count--; + } + + if (manpage[i] == '\b' || manpage[i] == '\f') + j -= 2; + } + + newpage[j++] = '\0'; + + strcpy (manpage, newpage); + free (newpage); +} + +static NODE * +manpage_node_of_file_buffer (file_buffer, pagename) + FILE_BUFFER *file_buffer; + char *pagename; +{ + NODE *node = (NODE *)NULL; + TAG *tag = (TAG *)NULL; + + if (file_buffer->contents) + { + register int i; + + for (i = 0; tag = file_buffer->tags[i]; i++) + { + if (strcasecmp (pagename, tag->nodename) == 0) + break; + } + } + + if (tag) + { + node = (NODE *)xmalloc (sizeof (NODE)); + node->filename = file_buffer->filename; + node->nodename = tag->nodename; + node->contents = file_buffer->contents + tag->nodestart; + node->nodelen = tag->nodelen; + node->flags = 0; + node->parent = (char *)NULL; + node->flags = (N_HasTagsTable | N_IsManPage); + node->contents += skip_node_separator (node->contents); + } + + return (node); +} + +static char * +read_from_fd (fd) + int fd; +{ + struct timeval timeout; + char *buffer = (char *)NULL; + int bsize = 0; + int bindex = 0; + int select_result; +#if defined (FD_SET) + fd_set read_fds; + + timeout.tv_sec = 15; + timeout.tv_usec = 0; + + FD_ZERO (&read_fds); + FD_SET (fd, &read_fds); + + select_result = select (fd + 1, fd_set_cast (&read_fds), 0, 0, &timeout); +#else /* !FD_SET */ + select_result = 1; +#endif /* !FD_SET */ + + switch (select_result) + { + case 0: + case -1: + break; + + default: + { + int amount_read; + int done = 0; + + while (!done) + { + while ((bindex + 1024) > (bsize)) + buffer = (char *)xrealloc (buffer, (bsize += 1024)); + buffer[bindex] = '\0'; + + amount_read = read (fd, buffer + bindex, 1023); + + if (amount_read < 0) + { + done = 1; + } + else + { + bindex += amount_read; + buffer[bindex] = '\0'; + if (amount_read == 0) + done = 1; + } + } + } + } + + if ((buffer != (char *)NULL) && (*buffer == '\0')) + { + free (buffer); + buffer = (char *)NULL; + } + + return (buffer); +} + +static char *reference_section_starters[] = +{ + "\nRELATED INFORMATION", + "\nRELATED\tINFORMATION", + "RELATED INFORMATION\n", + "RELATED\tINFORMATION\n", + "\nSEE ALSO", + "\nSEE\tALSO", + "SEE ALSO\n", + "SEE\tALSO\n", + (char *)NULL +}; + +static SEARCH_BINDING frs_binding; + +static SEARCH_BINDING * +find_reference_section (node) + NODE *node; +{ + register int i; + long position = -1; + + frs_binding.buffer = node->contents; + frs_binding.start = 0; + frs_binding.end = node->nodelen; + frs_binding.flags = S_SkipDest; + + for (i = 0; reference_section_starters[i] != (char *)NULL; i++) + { + position = search_forward (reference_section_starters[i], &frs_binding); + if (position != -1) + break; + } + + if (position == -1) + return ((SEARCH_BINDING *)NULL); + + /* We found the start of the reference section, and point is right after + the string which starts it. The text from here to the next header + (or end of buffer) contains the only references in this manpage. */ + frs_binding.start = position; + + for (i = frs_binding.start; i < frs_binding.end - 2; i++) + { + if ((frs_binding.buffer[i] == '\n') && + (!whitespace (frs_binding.buffer[i + 1]))) + { + frs_binding.end = i; + break; + } + } + + return (&frs_binding); +} + +REFERENCE ** +xrefs_of_manpage (node) + NODE *node; +{ + SEARCH_BINDING *reference_section; + REFERENCE **refs = (REFERENCE **)NULL; + int refs_index = 0; + int refs_slots = 0; + long position; + + reference_section = find_reference_section (node); + + if (reference_section == (SEARCH_BINDING *)NULL) + return ((REFERENCE **)NULL); + + /* Grovel the reference section building a list of references found there. + A reference is alphabetic characters followed by non-whitespace text + within parenthesis. */ + reference_section->flags = 0; + + while ((position = search_forward ("(", reference_section)) != -1) + { + register int start, end; + + for (start = position; start > reference_section->start; start--) + if (whitespace (reference_section->buffer[start])) + break; + + start++; + + for (end = position; end < reference_section->end; end++) + { + if (whitespace (reference_section->buffer[end])) + { + end = start; + break; + } + + if (reference_section->buffer[end] == ')') + { + end++; + break; + } + } + + if (end != start) + { + REFERENCE *entry; + int len = end - start; + + entry = (REFERENCE *)xmalloc (sizeof (REFERENCE)); + entry->label = (char *)xmalloc (1 + len); + strncpy (entry->label, (reference_section->buffer) + start, len); + entry->label[len] = '\0'; + entry->filename = strdup (node->filename); + entry->nodename = strdup (entry->label); + entry->start = start; + entry->end = end; + + add_pointer_to_array + (entry, refs_index, refs, refs_slots, 10, REFERENCE *); + } + + reference_section->start = position + 1; + } + + return (refs); +} + +long +locate_manpage_xref (node, start, dir) + NODE *node; + long start; + int dir; +{ + register int i, count; + REFERENCE **refs; + long position = -1; + + refs = xrefs_of_manpage (node); + + if (refs) + { + register int i, count; + REFERENCE *entry; + + for (i = 0; refs[i]; i++); + count = i; + + if (dir > 0) + { + for (i = 0; entry = refs[i]; i++) + if (entry->start > start) + { + position = entry->start; + break; + } + } + else + { + for (i = count - 1; i > -1; i--) + { + entry = refs[i]; + + if (entry->start < start) + { + position = entry->start; + break; + } + } + } + + info_free_references (refs); + } + return (position); +} + +/* This one was a little tricky. The binding buffer that is passed in has + a START and END value of 0 -- strlen (window-line-containing-point). + The BUFFER is a pointer to the start of that line. */ +REFERENCE ** +manpage_xrefs_in_binding (node, binding) + NODE *node; + SEARCH_BINDING *binding; +{ + register int i; + REFERENCE **all_refs = xrefs_of_manpage (node); + REFERENCE **brefs = (REFERENCE **)NULL; + REFERENCE *entry; + int brefs_index = 0; + int brefs_slots = 0; + int start, end; + + if (!all_refs) + return ((REFERENCE **)NULL); + + start = binding->start + (binding->buffer - node->contents); + end = binding->end + (binding->buffer - node->contents); + + for (i = 0; entry = all_refs[i]; i++) + { + if ((entry->start > start) && (entry->end < end)) + { + add_pointer_to_array + (entry, brefs_index, brefs, brefs_slots, 10, REFERENCE *); + } + else + { + maybe_free (entry->label); + maybe_free (entry->filename); + maybe_free (entry->nodename); + free (entry); + } + } + + free (all_refs); + return (brefs); +}
new file mode 100644 --- /dev/null +++ b/info/man.h @@ -0,0 +1,36 @@ +/* man.h: Defines and external function declarations for man.c */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Author: Brian J. Fox (bfox@ai.mit.edu) Sat May 6 16:19:13 1995. */ + +#if !defined (_MAN_H_) +#define _MAN_H_ + +#define MANPAGE_FILE_BUFFER_NAME "*manpages*" + +extern NODE *make_manpage_node (/* char *pagename */); +extern NODE *get_manpage_node (/* FILE_BUFFER *file_buffer, char *pagename */); +extern FILE_BUFFER *create_manpage_file_buffer (/* void */); +extern long locate_manpage_xref (/* NODE *node, long start, int dir */); +extern REFERENCE **xrefs_of_manpage (/* NODE *node */); +extern REFERENCE **manpage_xrefs_in_binding (/* NODE *node, SEARCH_BINDING *binding */); + +#endif /* !_MAN_H_ */
new file mode 100644 --- /dev/null +++ b/info/memcpy.c @@ -0,0 +1,20 @@ +/* Copy LEN bytes starting at SRCADDR to DESTADDR. Result undefined + if the source overlaps with the destination. + Return DESTADDR. */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +char * +memcpy (destaddr, srcaddr, len) + char *destaddr; + const char *srcaddr; + int len; +{ + char *dest = destaddr; + + while (len-- > 0) + *destaddr++ = *srcaddr++; + return dest; +}
new file mode 100644 --- /dev/null +++ b/info/memmove.c @@ -0,0 +1,24 @@ +/* memmove.c -- copy memory. + Copy LENGTH bytes from SOURCE to DEST. Does not null-terminate. + In the public domain. + By David MacKenzie <djm@gnu.ai.mit.edu>. */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +void +memmove (dest, source, length) + char *dest; + const char *source; + unsigned length; +{ + if (source < dest) + /* Moving from low mem to hi mem; start at end. */ + for (source += length, dest += length; length; --length) + *--dest = *--source; + else if (source != dest) + /* Moving from hi mem to low mem; start at beginning. */ + for (; length; --length) + *dest++ = *source++; +}
new file mode 100644 --- /dev/null +++ b/info/nodemenu.c @@ -0,0 +1,329 @@ +/* nodemenu.c -- Produce a menu of all visited nodes. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include "info.h" + +/* Return a line describing the format of a node information line. */ +static char * +nodemenu_format_info () +{ + return ("\n\ +* Menu:\n\ + (File)Node Lines Size Containing File\n\ + ---------- ----- ---- ---------------"); +} + +/* Produce a formatted line of information about NODE. Here is what we want + the output listing to look like: + +* Menu: + (File)Node Lines Size Containing File + ---------- ----- ---- --------------- +* (emacs)Buffers:: 48 2230 /usr/gnu/info/emacs/emacs-1 +* (autoconf)Writing configure.in:: 123 58789 /usr/gnu/info/autoconf/autoconf-1 +* (dir)Top:: 40 589 /usr/gnu/info/dir +*/ +static char * +format_node_info (node) + NODE *node; +{ + register int i, len; + char *parent, *containing_file; + static char *line_buffer = (char *)NULL; + + if (!line_buffer) + line_buffer = (char *)xmalloc (1000); + + if (node->parent) + { + parent = filename_non_directory (node->parent); + if (!parent) + parent = node->parent; + } + else + parent = (char *)NULL; + + containing_file = node->filename; + + if (!parent && !*containing_file) + sprintf (line_buffer, "* %s::", node->nodename); + else + { + char *file = (char *)NULL; + + if (parent) + file = parent; + else + file = filename_non_directory (containing_file); + + if (!file) + file = containing_file; + + if (!*file) + file = "dir"; + + sprintf (line_buffer, "* (%s)%s::", file, node->nodename); + } + + len = pad_to (36, line_buffer); + + { + int lines = 1; + + for (i = 0; i < node->nodelen; i++) + if (node->contents[i] == '\n') + lines++; + + sprintf (line_buffer + len, "%d", lines); + } + + len = pad_to (44, line_buffer); + sprintf (line_buffer + len, "%d", node->nodelen); + + if (node->filename && *(node->filename)) + { + len = pad_to (51, line_buffer); + sprintf (line_buffer + len, node->filename); + } + + return (strdup (line_buffer)); +} + +/* Little string comparison routine for qsort (). */ +static int +compare_strings (string1, string2) + char **string1, **string2; +{ + return (strcasecmp (*string1, *string2)); +} + +/* The name of the nodemenu node. */ +static char *nodemenu_nodename = "*Node Menu*"; + +/* Produce an informative listing of all the visited nodes, and return it + in a node. If FILTER_FUNC is non-null, it is a function which filters + which nodes will appear in the listing. FILTER_FUNC takes an argument + of NODE, and returns non-zero if the node should appear in the listing. */ +NODE * +get_visited_nodes (filter_func) + Function *filter_func; +{ + register int i, iw_index; + INFO_WINDOW *info_win; + NODE *node; + char **lines = (char **)NULL; + int lines_index = 0, lines_slots = 0; + + if (!info_windows) + return ((NODE *)NULL); + + for (iw_index = 0; info_win = info_windows[iw_index]; iw_index++) + { + for (i = 0; i < info_win->nodes_index; i++) + { + node = info_win->nodes[i]; + + /* We skip mentioning "*Node Menu*" nodes. */ + if (internal_info_node_p (node) && + (strcmp (node->nodename, nodemenu_nodename) == 0)) + continue; + + if (node && (!filter_func || (*filter_func) (node))) + { + char *line; + + line = format_node_info (node); + add_pointer_to_array + (line, lines_index, lines, lines_slots, 20, char *); + } + } + } + + /* Sort the array of information lines, if there are any. */ + if (lines) + { + register int j, newlen; + char **temp; + + qsort (lines, lines_index, sizeof (char *), compare_strings); + + /* Delete duplicates. */ + for (i = 0, newlen = 1; i < lines_index - 1; i++) + { + if (strcmp (lines[i], lines[i + 1]) == 0) + { + free (lines[i]); + lines[i] = (char *)NULL; + } + else + newlen++; + } + + /* We have free ()'d and marked all of the duplicate slots. + Copy the live slots rather than pruning the dead slots. */ + temp = (char **)xmalloc ((1 + newlen) * sizeof (char *)); + for (i = 0, j = 0; i < lines_index; i++) + if (lines[i]) + temp[j++] = lines[i]; + + temp[j] = (char *)NULL; + free (lines); + lines = temp; + lines_index = newlen; + } + + initialize_message_buffer (); + + printf_to_message_buffer + ("%s", replace_in_documentation + ("Here is the menu of nodes you have recently visited.\n\ +Select one from this menu, or use `\\[history-node]' in another window.\n")); + + printf_to_message_buffer ("%s\n", nodemenu_format_info ()); + + for (i = 0; (lines != (char **)NULL) && (i < lines_index); i++) + { + printf_to_message_buffer ("%s\n", lines[i]); + free (lines[i]); + } + + if (lines) + free (lines); + + node = message_buffer_to_node (); + add_gcable_pointer (node->contents); + return (node); +} + +DECLARE_INFO_COMMAND (list_visited_nodes, + "Make a window containing a menu of all of the currently visited nodes") +{ + WINDOW *new; + NODE *node; + + set_remembered_pagetop_and_point (window); + + /* If a window is visible and showing the buffer list already, re-use it. */ + for (new = windows; new; new = new->next) + { + node = new->node; + + if (internal_info_node_p (node) && + (strcmp (node->nodename, nodemenu_nodename) == 0)) + break; + } + + /* If we couldn't find an existing window, try to use the next window + in the chain. */ + if (!new && window->next) + new = window->next; + + /* If we still don't have a window, make a new one to contain the list. */ + if (!new) + { + WINDOW *old_active; + + old_active = active_window; + active_window = window; + new = window_make_window ((NODE *)NULL); + active_window = old_active; + } + + /* If we couldn't make a new window, use this one. */ + if (!new) + new = window; + + /* Lines do not wrap in this window. */ + new->flags |= W_NoWrap; + node = get_visited_nodes ((Function *)NULL); + name_internal_node (node, nodemenu_nodename); + + /* Even if this is an internal node, we don't want the window + system to treat it specially. So we turn off the internalness + of it here. */ + node->flags &= ~N_IsInternal; + + /* If this window is already showing a node menu, reuse the existing node + slot. */ + { + int remember_me = 1; + +#if defined (NOTDEF) + if (internal_info_node_p (new->node) && + (strcmp (new->node->nodename, nodemenu_nodename) == 0)) + remember_me = 0; +#endif /* NOTDEF */ + + window_set_node_of_window (new, node); + + if (remember_me) + remember_window_and_node (new, node); + } + + active_window = new; +} + +DECLARE_INFO_COMMAND (select_visited_node, + "Select a node which has been previously visited in a visible window") +{ + char *line; + NODE *node; + REFERENCE **menu; + + node = get_visited_nodes ((Function *)NULL); + + menu = info_menu_of_node (node); + free (node); + + line = + info_read_completing_in_echo_area (window, "Select visited node: ", menu); + + window = active_window; + + /* User aborts, just quit. */ + if (!line) + { + info_abort_key (window, 0, 0); + info_free_references (menu); + return; + } + + if (*line) + { + REFERENCE *entry; + + /* Find the selected label in the references. */ + entry = info_get_labeled_reference (line, menu); + + if (!entry) + info_error ("The reference disappeared! (%s).", line); + else + info_select_reference (window, entry); + } + + free (line); + info_free_references (menu); + + if (!info_error_was_printed) + window_clear_echo_area (); +}
new file mode 100644 --- /dev/null +++ b/info/nodes.c @@ -0,0 +1,1207 @@ +/* nodes.c -- How to get an Info file and node. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include <stdio.h> +#include <ctype.h> +#include <sys/types.h> +#if defined (HAVE_SYS_FILE_H) +#include <sys/file.h> +#endif /* HAVE_SYS_FILE_H */ +#include <sys/errno.h> +#include <sys/stat.h> +#if defined (HAVE_STRING_H) +#include <string.h> +#endif /* HAVE_STRING_H */ +#include "nodes.h" +#include "search.h" +#include "filesys.h" +#include "info-utils.h" + +#if defined (HANDLE_MAN_PAGES) +# include "man.h" +#endif /* HANDLE_MAN_PAGES */ + +#if !defined (O_RDONLY) +#if defined (HAVE_SYS_FCNTL_H) +#include <sys/fcntl.h> +#else /* !HAVE_SYS_FCNTL_H */ +#include <fcntl.h> +#endif /* !HAVE_SYS_FCNTL_H */ +#endif /* !O_RDONLY */ + +#if !defined (errno) +extern int errno; +#endif /* !errno */ + +/* **************************************************************** */ +/* */ +/* Functions Static to this File */ +/* */ +/* **************************************************************** */ + +static void forget_info_file (), remember_info_file (); +static void free_file_buffer_tags (), free_info_tag (); +static void get_nodes_of_tags_table (), get_nodes_of_info_file (); +static void get_tags_of_indirect_tags_table (); +static void info_reload_file_buffer_contents (); +static char *adjust_nodestart (); +static FILE_BUFFER *info_load_file_internal (), *info_find_file_internal (); +static NODE *info_node_of_file_buffer_tags (); + +static long get_node_length (); + +/* Magic number that RMS used to decide how much a tags table pointer could + be off by. I feel that it should be much smaller, like on the order of + 4. */ +#define DEFAULT_INFO_FUDGE 1000 + +/* Passed to *_internal functions. INFO_GET_TAGS says to do what is + neccessary to fill in the nodes or tags arrays in FILE_BUFFER. */ +#define INFO_NO_TAGS 0 +#define INFO_GET_TAGS 1 + +/* **************************************************************** */ +/* */ +/* Global Variables */ +/* */ +/* **************************************************************** */ + +/* When non-zero, this is a string describing the recent file error. */ +char *info_recent_file_error = (char *)NULL; + +/* The list of already loaded nodes. */ +FILE_BUFFER **info_loaded_files = (FILE_BUFFER **)NULL; + +/* The number of slots currently allocated to LOADED_FILES. */ +int info_loaded_files_slots = 0; + +/* **************************************************************** */ +/* */ +/* Public Functions for Node Manipulation */ +/* */ +/* **************************************************************** */ + +/* Used to build "dir" menu from "localdir" files found in INFOPATH. */ +extern void maybe_build_dir_node (); + +/* Return a pointer to a NODE structure for the Info node (FILENAME)NODENAME. + FILENAME can be passed as NULL, in which case the filename of "dir" is used. + NODENAME can be passed as NULL, in which case the nodename of "Top" is used. + If the node cannot be found, return a NULL pointer. */ +NODE * +info_get_node (filename, nodename) + char *filename, *nodename; +{ + FILE_BUFFER *file_buffer; + NODE *node; + + file_buffer = (FILE_BUFFER *)NULL; + info_recent_file_error = (char *)NULL; + + info_parse_node (nodename, DONT_SKIP_NEWLINES); + nodename = (char *)NULL; + + if (info_parsed_filename) + filename = info_parsed_filename; + + if (info_parsed_nodename) + nodename = info_parsed_nodename; + + /* If FILENAME is not specified, it defaults to "dir". */ + if (!filename) + filename = "dir"; + + /* If the file to be looked up is "dir", build the contents from all of + the "dir"s and "localdir"s found in INFOPATH. */ + if (strcasecmp (filename, "dir") == 0) + maybe_build_dir_node (filename); + + /* Find the correct info file. */ + file_buffer = info_find_file (filename); + + if (!file_buffer) + { + if (filesys_error_number) + info_recent_file_error = + filesys_error_string (filename, filesys_error_number); + return ((NODE *)NULL); + } + + node = info_get_node_of_file_buffer (nodename, file_buffer); + /* If the node looked for was "Top", try again looking for the node under + a slightly different name. */ + if (!node && (nodename == NULL || strcasecmp (nodename, "Top") == 0)) + { + node = info_get_node_of_file_buffer ("Top", file_buffer); + if (!node) + node = info_get_node_of_file_buffer ("top", file_buffer); + if (!node) + node = info_get_node_of_file_buffer ("TOP", file_buffer); + } + return (node); +} + +/* Return a pointer to a NODE structure for the Info node NODENAME in + FILE_BUFFER. NODENAME can be passed as NULL, in which case the + nodename of "Top" is used. If the node cannot be found, return a + NULL pointer. */ +NODE * +info_get_node_of_file_buffer (nodename, file_buffer) + char *nodename; + FILE_BUFFER *file_buffer; +{ + NODE *node = (NODE *)NULL; + + /* If we are unable to find the file, we have to give up. There isn't + anything else we can do. */ + if (!file_buffer) + return ((NODE *)NULL); + + /* If the file buffer was gc'ed, reload the contents now. */ + if (!file_buffer->contents) + info_reload_file_buffer_contents (file_buffer); + + /* If NODENAME is not specified, it defaults to "Top". */ + if (!nodename) + nodename = "Top"; + + /* If the name of the node that we wish to find is exactly "*", then the + node body is the contents of the entire file. Create and return such + a node. */ + if (strcmp (nodename, "*") == 0) + { + node = (NODE *)xmalloc (sizeof (NODE)); + node->filename = file_buffer->fullpath; + node->parent = (char *)NULL; + node->nodename = strdup ("*"); + node->contents = file_buffer->contents; + node->nodelen = file_buffer->filesize; + node->flags = 0; + } +#if defined (HANDLE_MAN_PAGES) + /* If the file buffer is the magic one associated with manpages, call + the manpage node finding function instead. */ + else if (file_buffer->flags & N_IsManPage) + { + node = get_manpage_node (file_buffer, nodename); + } +#endif /* HANDLE_MAN_PAGES */ + /* If this is the "main" info file, it might contain a tags table. Search + the tags table for an entry which matches the node that we want. If + there is a tags table, get the file which contains this node, but don't + bother building a node list for it. */ + else if (file_buffer->tags) + { + node = info_node_of_file_buffer_tags (file_buffer, nodename); + } + + /* Return the results of our node search. */ + return (node); +} + +/* Locate the file named by FILENAME, and return the information structure + describing this file. The file may appear in our list of loaded files + already, or it may not. If it does not already appear, find the file, + and add it to the list of loaded files. If the file cannot be found, + return a NULL FILE_BUFFER *. */ +FILE_BUFFER * +info_find_file (filename) + char *filename; +{ + return (info_find_file_internal (filename, INFO_GET_TAGS)); +} + +/* Load the info file FILENAME, remembering information about it in a + file buffer. */ +FILE_BUFFER * +info_load_file (filename) + char *filename; +{ + return (info_load_file_internal (filename, INFO_GET_TAGS)); +} + + +/* **************************************************************** */ +/* */ +/* Private Functions Implementation */ +/* */ +/* **************************************************************** */ + +/* The workhorse for info_find_file (). Non-zero 2nd argument says to + try to build a tags table (or otherwise glean the nodes) for this + file once found. By default, we build the tags table, but when this + function is called by info_get_node () when we already have a valid + tags table describing the nodes, it is unnecessary. */ +static FILE_BUFFER * +info_find_file_internal (filename, get_tags) + char *filename; + int get_tags; +{ + register int i; + register FILE_BUFFER *file_buffer; + + /* First try to find the file in our list of already loaded files. */ + if (info_loaded_files) + { + for (i = 0; file_buffer = info_loaded_files[i]; i++) + if ((strcmp (filename, file_buffer->filename) == 0) || + (strcmp (filename, file_buffer->fullpath) == 0) || + ((*filename != '/') && + strcmp (filename, + filename_non_directory (file_buffer->fullpath)) == 0)) + { + struct stat new_info, *old_info; + + /* This file is loaded. If the filename that we want is + specifically "dir", then simply return the file buffer. */ + if (strcasecmp (filename_non_directory (filename), "dir") == 0) + return (file_buffer); + +#if defined (HANDLE_MAN_PAGES) + /* Do the same for the magic MANPAGE file. */ + if (file_buffer->flags & N_IsManPage) + return (file_buffer); +#endif /* HANDLE_MAN_PAGES */ + + /* The file appears to be already loaded, and it is not "dir". + Check to see if it has changed since the last time it was + loaded. */ + if (stat (file_buffer->fullpath, &new_info) == -1) + { + filesys_error_number = errno; + return ((FILE_BUFFER *)NULL); + } + + old_info = &file_buffer->finfo; + + if ((new_info.st_size != old_info->st_size) || + (new_info.st_mtime != old_info->st_mtime)) + { + /* The file has changed. Forget that we ever had loaded it + in the first place. */ + forget_info_file (filename); + break; + } + else + { + /* The info file exists, and has not changed since the last + time it was loaded. If the caller requested a nodes list + for this file, and there isn't one here, build the nodes + for this file_buffer. In any case, return the file_buffer + object. */ + if (get_tags && !file_buffer->tags) + build_tags_and_nodes (file_buffer); + + return (file_buffer); + } + } + } + + /* The file wasn't loaded. Try to load it now. */ +#if defined (HANDLE_MAN_PAGES) + /* If the name of the file that we want is our special file buffer for + Unix manual pages, then create the file buffer, and return it now. */ + if (strcasecmp (filename, MANPAGE_FILE_BUFFER_NAME) == 0) + file_buffer = create_manpage_file_buffer (); + else +#endif /* HANDLE_MAN_PAGES */ + file_buffer = info_load_file_internal (filename, get_tags); + + /* If the file was loaded, remember the name under which it was found. */ + if (file_buffer) + remember_info_file (file_buffer); + + return (file_buffer); +} + +/* The workhorse function for info_load_file (). Non-zero second argument + says to build a list of tags (or nodes) for this file. This is the + default behaviour when info_load_file () is called, but it is not + necessary when loading a subfile for which we already have tags. */ +static FILE_BUFFER * +info_load_file_internal (filename, get_tags) + char *filename; + int get_tags; +{ + char *fullpath, *contents; + long filesize; + struct stat finfo; + int retcode; + FILE_BUFFER *file_buffer = (FILE_BUFFER *)NULL; + + /* Get the full pathname of this file, as known by the info system. + That is to say, search along INFOPATH and expand tildes, etc. */ + fullpath = info_find_fullpath (filename); + + /* Did we actually find the file? */ + retcode = stat (fullpath, &finfo); + + /* If the file referenced by the name returned from info_find_fullpath () + doesn't exist, then try again with the last part of the filename + appearing in lowercase. */ + if (retcode < 0) + { + char *lowered_name; + char *basename; + + lowered_name = strdup (filename); + basename = (char *) strrchr (lowered_name, '/'); + + if (basename) + basename++; + else + basename = lowered_name; + + while (*basename) + { + if (isupper (*basename)) + *basename = tolower (*basename); + + basename++; + } + + fullpath = info_find_fullpath (lowered_name); + free (lowered_name); + + retcode = stat (fullpath, &finfo); + } + + /* If the file wasn't found, give up, returning a NULL pointer. */ + if (retcode < 0) + { + filesys_error_number = errno; + return ((FILE_BUFFER *)NULL); + } + + /* Otherwise, try to load the file. */ + contents = filesys_read_info_file (fullpath, &filesize, &finfo); + + if (!contents) + return ((FILE_BUFFER *)NULL); + + /* The file was found, and can be read. Allocate FILE_BUFFER and fill + in the various members. */ + file_buffer = make_file_buffer (); + file_buffer->filename = strdup (filename); + file_buffer->fullpath = strdup (fullpath); + file_buffer->finfo = finfo; + file_buffer->filesize = filesize; + file_buffer->contents = contents; + if (file_buffer->filesize != file_buffer->finfo.st_size) + file_buffer->flags |= N_IsCompressed; + + /* If requested, build the tags and nodes for this file buffer. */ + if (get_tags) + build_tags_and_nodes (file_buffer); + + return (file_buffer); +} + +/* Grovel FILE_BUFFER->contents finding tags and nodes, and filling in the + various slots. This can also be used to rebuild a tag or node table. */ +void +build_tags_and_nodes (file_buffer) + FILE_BUFFER *file_buffer; +{ + SEARCH_BINDING binding; + long position; + + free_file_buffer_tags (file_buffer); + file_buffer->flags &= ~N_HasTagsTable; + + /* See if there is a tags table in this info file. */ + binding.buffer = file_buffer->contents; + binding.start = file_buffer->filesize; + binding.end = binding.start - 1000; + if (binding.end < 0) + binding.end = 0; + binding.flags = S_FoldCase; + + position = search_backward (TAGS_TABLE_END_LABEL, &binding); + + /* If there is a tag table, find the start of it, and grovel over it + extracting tag information. */ + if (position != -1) + while (1) + { + long tags_table_begin, tags_table_end; + + binding.end = position; + binding.start = binding.end - 5 - strlen (TAGS_TABLE_END_LABEL); + if (binding.start < 0) + binding.start = 0; + + position = find_node_separator (&binding); + + /* For this test, (and all others here) failure indicates a bogus + tags table. Grovel the file. */ + if (position == -1) + break; + + /* Remember the end of the tags table. */ + binding.start = position; + tags_table_end = binding.start; + binding.end = 0; + + /* Locate the start of the tags table. */ + position = search_backward (TAGS_TABLE_BEG_LABEL, &binding); + + if (position == -1) + break; + + binding.end = position; + binding.start = binding.end - 5 - strlen (TAGS_TABLE_BEG_LABEL); + position = find_node_separator (&binding); + + if (position == -1) + break; + + /* The file contains a valid tags table. Fill the FILE_BUFFER's + tags member. */ + file_buffer->flags |= N_HasTagsTable; + tags_table_begin = position; + + /* If this isn't an indirect tags table, just remember the nodes + described locally in this tags table. Note that binding.end + is pointing to just after the beginning label. */ + binding.start = binding.end; + binding.end = file_buffer->filesize; + + if (!looking_at (TAGS_TABLE_IS_INDIRECT_LABEL, &binding)) + { + binding.start = tags_table_begin; + binding.end = tags_table_end; + get_nodes_of_tags_table (file_buffer, &binding); + return; + } + else + { + /* This is an indirect tags table. Build TAGS member. */ + SEARCH_BINDING indirect; + + indirect.start = tags_table_begin; + indirect.end = 0; + indirect.buffer = binding.buffer; + indirect.flags = S_FoldCase; + + position = search_backward (INDIRECT_TAGS_TABLE_LABEL, &indirect); + + if (position == -1) + { + /* This file is malformed. Give up. */ + return; + } + + indirect.start = position; + indirect.end = tags_table_begin; + binding.start = tags_table_begin; + binding.end = tags_table_end; + get_tags_of_indirect_tags_table (file_buffer, &indirect, &binding); + return; + } + } + + /* This file doesn't contain any kind of tags table. Grovel the + file and build node entries for it. */ + get_nodes_of_info_file (file_buffer); +} + +/* Search through FILE_BUFFER->contents building an array of TAG *, + one entry per each node present in the file. Store the tags in + FILE_BUFFER->tags, and the number of allocated slots in + FILE_BUFFER->tags_slots. */ +static void +get_nodes_of_info_file (file_buffer) + FILE_BUFFER *file_buffer; +{ + long nodestart; + int tags_index = 0; + SEARCH_BINDING binding; + + binding.buffer = file_buffer->contents; + binding.start = 0; + binding.end = file_buffer->filesize; + binding.flags = S_FoldCase; + + while ((nodestart = find_node_separator (&binding)) != -1) + { + int start, end; + char *nodeline; + TAG *entry; + + /* Skip past the characters just found. */ + binding.start = nodestart; + binding.start += skip_node_separator (binding.buffer + binding.start); + + /* Move to the start of the line defining the node. */ + nodeline = binding.buffer + binding.start; + + /* Find "Node:" */ + start = string_in_line (INFO_NODE_LABEL, nodeline); + + /* If not there, this is not the start of a node. */ + if (start == -1) + continue; + + /* Find the start of the nodename. */ + start += skip_whitespace (nodeline + start); + + /* Find the end of the nodename. */ + end = start + + skip_node_characters (nodeline + start, DONT_SKIP_NEWLINES); + + /* Okay, we have isolated the node name, and we know where the + node starts. Remember this information in a NODE structure. */ + entry = (TAG *)xmalloc (sizeof (TAG)); + entry->nodename = (char *)xmalloc (1 + (end - start)); + strncpy (entry->nodename, nodeline + start, end - start); + entry->nodename[end - start] = '\0'; + entry->nodestart = nodestart; + { + SEARCH_BINDING node_body; + + node_body.buffer = binding.buffer + binding.start; + node_body.start = 0; + node_body.end = binding.end - binding.start; + node_body.flags = S_FoldCase; + entry->nodelen = get_node_length (&node_body); + } + + entry->filename = file_buffer->fullpath; + + /* Add this tag to the array of tag structures in this FILE_BUFFER. */ + add_pointer_to_array (entry, tags_index, file_buffer->tags, + file_buffer->tags_slots, 100, TAG *); + } +} + +/* Return the length of the node which starts at BINDING. */ +static long +get_node_length (binding) + SEARCH_BINDING *binding; +{ + register int i; + char *body; + + /* From the Info-RFC file: + [A node] ends with either a ^_, a ^L, or the end of file. */ + for (i = binding->start, body = binding->buffer; i < binding->end; i++) + { + if (body[i] == INFO_FF || body[i] == INFO_COOKIE) + break; + } + return ((long) i - binding->start); +} + +/* Build and save the array of nodes in FILE_BUFFER by searching through the + contents of BUFFER_BINDING for a tags table, and groveling the contents. */ +static void +get_nodes_of_tags_table (file_buffer, buffer_binding) + FILE_BUFFER *file_buffer; + SEARCH_BINDING *buffer_binding; +{ + int offset, tags_index = 0; + SEARCH_BINDING *search; + long position; + + search = copy_binding (buffer_binding); + + /* Find the start of the tags table. */ + position = find_tags_table (search); + + /* If none, we're all done. */ + if (position == -1) + return; + + /* Move to one character before the start of the actual table. */ + search->start = position; + search->start += skip_node_separator (search->buffer + search->start); + search->start += strlen (TAGS_TABLE_BEG_LABEL); + search->start--; + + /* The tag table consists of lines containing node names and positions. + Do each line until we find one that doesn't contain a node name. */ + while ((position = search_forward ("\n", search)) != -1) + { + TAG *entry; + char *nodedef; + + /* Prepare to skip this line. */ + search->start = position; + search->start++; + + /* Skip past informative "(Indirect)" tags table line. */ + if (!tags_index && looking_at (TAGS_TABLE_IS_INDIRECT_LABEL, search)) + continue; + + /* Find the label preceding the node name. */ + offset = + string_in_line (INFO_NODE_LABEL, search->buffer + search->start); + + /* If not there, not a defining line, so we must be out of the + tags table. */ + if (offset == -1) + break; + + /* Point to the beginning of the node definition. */ + search->start += offset; + nodedef = search->buffer + search->start; + nodedef += skip_whitespace (nodedef); + + /* Move past the node's name. */ + for (offset = 0; + (nodedef[offset]) && (nodedef[offset] != INFO_TAGSEP); + offset++); + + if (nodedef[offset] != INFO_TAGSEP) + continue; + + entry = (TAG *)xmalloc (sizeof (TAG)); + entry->nodename = (char *)xmalloc (1 + offset); + strncpy (entry->nodename, nodedef, offset); + entry->nodename[offset] = '\0'; + offset++; + entry->nodestart = (long) atol (nodedef + offset); + + /* We don't know the length of this node yet. */ + entry->nodelen = -1; + + /* The filename of this node is currently known as the same as the + name of this file. */ + entry->filename = file_buffer->fullpath; + + /* Add this node structure to the array of node structures in this + FILE_BUFFER. */ + add_pointer_to_array (entry, tags_index, file_buffer->tags, + file_buffer->tags_slots, 100, TAG *); + } + free (search); +} + +/* A structure used only in get_tags_of_indirect_tags_table () to hold onto + an intermediate value. */ +typedef struct { + char *filename; + long first_byte; +} SUBFILE; + +/* Remember in FILE_BUFFER the nodenames, subfilenames, and offsets within the + subfiles of every node which appears in TAGS_BINDING. The 2nd argument is + a binding surrounding the indirect files list. */ +static void +get_tags_of_indirect_tags_table (file_buffer, indirect_binding, tags_binding) + FILE_BUFFER *file_buffer; + SEARCH_BINDING *indirect_binding, *tags_binding; +{ + register int i; + SUBFILE **subfiles = (SUBFILE **)NULL; + int subfiles_index = 0, subfiles_slots = 0; + TAG *entry; + + /* First get the list of tags from the tags table. Then lookup the + associated file in the indirect list for each tag, and update it. */ + get_nodes_of_tags_table (file_buffer, tags_binding); + + /* We have the list of tags in file_buffer->tags. Get the list of + subfiles from the indirect table. */ + { + char *start, *end, *line; + SUBFILE *subfile; + + start = indirect_binding->buffer + indirect_binding->start; + end = indirect_binding->buffer + indirect_binding->end; + line = start; + + while (line < end) + { + int colon; + + colon = string_in_line (":", line); + + if (colon == -1) + break; + + subfile = (SUBFILE *)xmalloc (sizeof (SUBFILE)); + subfile->filename = (char *)xmalloc (colon); + strncpy (subfile->filename, line, colon - 1); + subfile->filename[colon - 1] = '\0'; + subfile->first_byte = (long) atol (line + colon); + + add_pointer_to_array + (subfile, subfiles_index, subfiles, subfiles_slots, 10, SUBFILE *); + + while (*line++ != '\n'); + } + } + + /* If we have successfully built the indirect files table, then + merge the information in the two tables. */ + if (!subfiles) + { + free_file_buffer_tags (file_buffer); + return; + } + else + { + register int tags_index; + long header_length; + SEARCH_BINDING binding; + + /* Find the length of the header of the file containing the indirect + tags table. This header appears at the start of every file. We + want the absolute position of each node within each subfile, so + we subtract the start of the containing subfile from the logical + position of the node, and then add the length of the header in. */ + binding.buffer = file_buffer->contents; + binding.start = 0; + binding.end = file_buffer->filesize; + binding.flags = S_FoldCase; + + header_length = find_node_separator (&binding); + if (header_length == -1) + header_length = 0; + + /* Build the file buffer's list of subfiles. */ + { + char *containing_dir, *temp; + int len_containing_dir; + + containing_dir = strdup (file_buffer->fullpath); + temp = (char *) strrchr (containing_dir, '/'); + + if (temp) + *temp = '\0'; + + len_containing_dir = strlen (containing_dir); + + for (i = 0; subfiles[i]; i++); + + file_buffer->subfiles = (char **) xmalloc ((1 + i) * sizeof (char *)); + + for (i = 0; subfiles[i]; i++) + { + char *fullpath; + + fullpath = (char *) xmalloc + (2 + strlen (subfiles[i]->filename) + len_containing_dir); + + sprintf (fullpath, "%s/%s", + containing_dir, subfiles[i]->filename); + + file_buffer->subfiles[i] = fullpath; + } + file_buffer->subfiles[i] = (char *)NULL; + free (containing_dir); + } + + /* For each node in the file's tags table, remember the starting + position. */ + for (tags_index = 0; + entry = file_buffer->tags[tags_index]; + tags_index++) + { + for (i = 0; + subfiles[i] && entry->nodestart >= subfiles[i]->first_byte; + i++); + + /* If the Info file containing the indirect tags table is + malformed, then give up. */ + if (!i) + { + /* The Info file containing the indirect tags table is + malformed. Give up. */ + for (i = 0; subfiles[i]; i++) + { + free (subfiles[i]->filename); + free (subfiles[i]); + free (file_buffer->subfiles[i]); + } + file_buffer->subfiles = (char **)NULL; + free_file_buffer_tags (file_buffer); + return; + } + + /* SUBFILES[i] is the index of the first subfile whose logical + first byte is greater than the logical offset of this node's + starting position. This means that the subfile directly + preceding this one is the one containing the node. */ + + entry->filename = file_buffer->subfiles[i - 1]; + entry->nodestart -= subfiles[i -1]->first_byte; + entry->nodestart += header_length; + entry->nodelen = -1; + } + + /* We have successfully built the tags table. Remember that it + was indirect. */ + file_buffer->flags |= N_TagsIndirect; + } + + /* Free the structures assigned to SUBFILES. Free the names as well + as the structures themselves, then finally, the array. */ + for (i = 0; subfiles[i]; i++) + { + free (subfiles[i]->filename); + free (subfiles[i]); + } + free (subfiles); +} + +/* Return the node from FILE_BUFFER which matches NODENAME by searching + the tags table in FILE_BUFFER. If the node could not be found, return + a NULL pointer. */ +static NODE * +info_node_of_file_buffer_tags (file_buffer, nodename) + FILE_BUFFER *file_buffer; + char *nodename; +{ + register int i; + TAG *tag; + + for (i = 0; tag = file_buffer->tags[i]; i++) + if (strcmp (nodename, tag->nodename) == 0) + { + FILE_BUFFER *subfile; + + subfile = info_find_file_internal (tag->filename, INFO_NO_TAGS); + + if (!subfile) + return ((NODE *)NULL); + + if (!subfile->contents) + { + info_reload_file_buffer_contents (subfile); + + if (!subfile->contents) + return ((NODE *)NULL); + } + + /* If we were able to find this file and load it, then return + the node within it. */ + { + NODE *node; + + node = (NODE *)xmalloc (sizeof (NODE)); + node->filename = (subfile->fullpath); + node->nodename = tag->nodename; + node->contents = subfile->contents + tag->nodestart; + node->flags = 0; + node->parent = (char *)NULL; + + if (file_buffer->flags & N_HasTagsTable) + { + node->flags |= N_HasTagsTable; + + if (file_buffer->flags & N_TagsIndirect) + { + node->flags |= N_TagsIndirect; + node->parent = file_buffer->fullpath; + } + } + + if (subfile->flags & N_IsCompressed) + node->flags |= N_IsCompressed; + + /* If TAG->nodelen hasn't been calculated yet, then we aren't + in a position to trust the entry pointer. Adjust things so + that ENTRY->nodestart gets the exact address of the start of + the node separator which starts this node, and NODE->contents + gets the address of the line defining this node. If we cannot + do that, the node isn't really here. */ + if (tag->nodelen == -1) + { + int min, max; + char *node_sep; + SEARCH_BINDING node_body; + char *buff_end; + + min = max = DEFAULT_INFO_FUDGE; + + if (tag->nodestart < DEFAULT_INFO_FUDGE) + min = tag->nodestart; + + if (DEFAULT_INFO_FUDGE > + (subfile->filesize - tag->nodestart)) + max = subfile->filesize - tag->nodestart; + + /* NODE_SEP gets the address of the separator which defines + this node, or (char *)NULL if the node wasn't found. + NODE->contents is side-effected to point to right after + the separator. */ + node_sep = adjust_nodestart (node, min, max); + if (node_sep == (char *)NULL) + { + free (node); + return ((NODE *)NULL); + } + /* Readjust tag->nodestart. */ + tag->nodestart = node_sep - subfile->contents; + + /* Calculate the length of the current node. */ + buff_end = subfile->contents + subfile->filesize; + + node_body.buffer = node->contents; + node_body.start = 0; + node_body.end = buff_end - node_body.buffer; + node_body.flags = 0; + tag->nodelen = get_node_length (&node_body); + } + else + { + /* Since we know the length of this node, we have already + adjusted tag->nodestart to point to the exact start of + it. Simply skip the node separator. */ + node->contents += skip_node_separator (node->contents); + } + + node->nodelen = tag->nodelen; + return (node); + } + } + + /* There was a tag table for this file, and the node wasn't found. + Return NULL, since this file doesn't contain the desired node. */ + return ((NODE *)NULL); +} + +/* **************************************************************** */ +/* */ +/* Managing file_buffers, nodes, and tags. */ +/* */ +/* **************************************************************** */ + +/* Create a new, empty file buffer. */ +FILE_BUFFER * +make_file_buffer () +{ + FILE_BUFFER *file_buffer; + + file_buffer = (FILE_BUFFER *)xmalloc (sizeof (FILE_BUFFER)); + file_buffer->filename = file_buffer->fullpath = (char *)NULL; + file_buffer->contents = (char *)NULL; + file_buffer->tags = (TAG **)NULL; + file_buffer->subfiles = (char **)NULL; + file_buffer->tags_slots = 0; + file_buffer->flags = 0; + + return (file_buffer); +} + +/* Add FILE_BUFFER to our list of already loaded info files. */ +static void +remember_info_file (file_buffer) + FILE_BUFFER *file_buffer; +{ + int i; + + for (i = 0; info_loaded_files && info_loaded_files[i]; i++) + ; + + add_pointer_to_array (file_buffer, i, info_loaded_files, + info_loaded_files_slots, 10, FILE_BUFFER *); +} + +/* Forget the contents, tags table, nodes list, and names of FILENAME. */ +static void +forget_info_file (filename) + char *filename; +{ + register int i; + FILE_BUFFER *file_buffer; + + if (!info_loaded_files) + return; + + for (i = 0; file_buffer = info_loaded_files[i]; i++) + if ((strcmp (filename, file_buffer->filename) == 0) || + (strcmp (filename, file_buffer->fullpath) == 0)) + { + free (file_buffer->filename); + free (file_buffer->fullpath); + + if (file_buffer->contents) + free (file_buffer->contents); + + /* Note that free_file_buffer_tags () also kills the subfiles + list, since the subfiles list is only of use in conjunction + with tags. */ + free_file_buffer_tags (file_buffer); + + while (info_loaded_files[i] = info_loaded_files[++i]) + ; + + break; + } +} + +/* Free the tags (if any) associated with FILE_BUFFER. */ +static void +free_file_buffer_tags (file_buffer) + FILE_BUFFER *file_buffer; +{ + register int i; + + if (file_buffer->tags) + { + register TAG *tag; + + for (i = 0; tag = file_buffer->tags[i]; i++) + free_info_tag (tag); + + free (file_buffer->tags); + file_buffer->tags = (TAG **)NULL; + file_buffer->tags_slots = 0; + } + + if (file_buffer->subfiles) + { + for (i = 0; file_buffer->subfiles[i]; i++) + free (file_buffer->subfiles[i]); + + free (file_buffer->subfiles); + file_buffer->subfiles = (char **)NULL; + } +} + +/* Free the data associated with TAG, as well as TAG itself. */ +static void +free_info_tag (tag) + TAG *tag; +{ + free (tag->nodename); + + /* We don't free tag->filename, because that filename is part of the + subfiles list for the containing FILE_BUFFER. free_info_tags () + will free the subfiles when it is appropriate. */ + + free (tag); +} + +/* Load the contents of FILE_BUFFER->contents. This function is called + when a file buffer was loaded, and then in order to conserve memory, the + file buffer's contents were freed and the pointer was zero'ed. Note that + the file was already loaded at least once successfully, so the tags and/or + nodes members are still correctly filled. */ +static void +info_reload_file_buffer_contents (fb) + FILE_BUFFER *fb; +{ + +#if defined (HANDLE_MAN_PAGES) + /* If this is the magic manpage node, don't try to reload, just give up. */ + if (fb->flags & N_IsManPage) + return; +#endif + + fb->flags &= ~N_IsCompressed; + + /* Let the filesystem do all the work for us. */ + fb->contents = + filesys_read_info_file (fb->fullpath, &(fb->filesize), &(fb->finfo)); + if (fb->filesize != (long) (fb->finfo.st_size)) + fb->flags |= N_IsCompressed; +} + +/* Return the actual starting memory location of NODE, side-effecting + NODE->contents. MIN and MAX are bounds for a search if one is necessary. + Because of the way that tags are implemented, the physical nodestart may + not actually be where the tag says it is. If that is the case, but the + node was found anyway, set N_UpdateTags in NODE->flags. If the node is + found, return non-zero. NODE->contents is returned positioned right after + the node separator that precedes this node, while the return value is + position directly on the separator that precedes this node. If the node + could not be found, return a NULL pointer. */ +static char * +adjust_nodestart (node, min, max) + NODE *node; + int min, max; +{ + long position; + SEARCH_BINDING node_body; + + /* Define the node body. */ + node_body.buffer = node->contents; + node_body.start = 0; + node_body.end = max; + node_body.flags = 0; + + /* Try the optimal case first. Who knows? This file may actually be + formatted (mostly) correctly. */ + if (node_body.buffer[0] != INFO_COOKIE && min > 2) + node_body.buffer -= 3; + + position = find_node_separator (&node_body); + + /* If we found a node start, then check it out. */ + if (position != -1) + { + int sep_len; + + sep_len = skip_node_separator (node->contents); + + /* If we managed to skip a node separator, then check for this node + being the right one. */ + if (sep_len != 0) + { + char *nodedef, *nodestart; + int offset; + + nodestart = node_body.buffer + position + sep_len; + nodedef = nodestart; + offset = string_in_line (INFO_NODE_LABEL, nodedef); + + if (offset != -1) + { + nodedef += offset; + nodedef += skip_whitespace (nodedef); + offset = skip_node_characters (nodedef, DONT_SKIP_NEWLINES); + if ((offset == strlen (node->nodename)) && + (strncmp (node->nodename, nodedef, offset) == 0)) + { + node->contents = nodestart; + return (node_body.buffer + position); + } + } + } + } + + /* Oh well, I guess we have to try to find it in a larger area. */ + node_body.buffer = node->contents - min; + node_body.start = 0; + node_body.end = min + max; + node_body.flags = 0; + + position = find_node_in_binding (node->nodename, &node_body); + + /* If the node couldn't be found, we lose big. */ + if (position == -1) + return ((char *)NULL); + + /* Otherwise, the node was found, but the tags table could need updating + (if we used a tag to get here, that is). Set the flag in NODE->flags. */ + node->contents = node_body.buffer + position; + node->contents += skip_node_separator (node->contents); + if (node->flags & N_HasTagsTable) + node->flags |= N_UpdateTags; + return (node_body.buffer + position); +}
new file mode 100644 --- /dev/null +++ b/info/nodes.h @@ -0,0 +1,168 @@ +/* nodes.h -- How we represent nodes internally. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_NODES_H_) +#define _NODES_H_ + +#include "general.h" + +/* **************************************************************** */ +/* */ +/* User Code Interface */ +/* */ +/* **************************************************************** */ + +/* Callers generally only want the node itself. This structure is used + to pass node information around. None of the information in this + structure should ever be directly freed. The structure itself can + be passed to free (). Note that NODE->parent is non-null if this + node's file is a subfile. In that case, NODE->parent is the logical + name of the file containing this node. Both names are given as full + paths, so you might have: node->filename = "/usr/gnu/info/emacs-1", + with node->parent = "/usr/gnu/info/emacs". */ +typedef struct { + char *filename; /* The physical file containing this node. */ + char *parent; /* Non-null is the logical file name. */ + char *nodename; /* The name of this node. */ + char *contents; /* Characters appearing in this node. */ + long nodelen; /* The length of the CONTENTS member. */ + int flags; /* See immediately below. */ +} NODE; + +/* Defines that can appear in NODE->flags. All informative. */ +#define N_HasTagsTable 0x01 /* This node was found through a tags table. */ +#define N_TagsIndirect 0x02 /* The tags table was an indirect one. */ +#define N_UpdateTags 0x04 /* The tags table is out of date. */ +#define N_IsCompressed 0x08 /* The file is compressed on disk. */ +#define N_IsInternal 0x10 /* This node was made by Info. */ +#define N_CannotGC 0x20 /* File buffer cannot be gc'ed. */ +#define N_IsManPage 0x40 /* This node is a Un*x manpage. */ + +/* **************************************************************** */ +/* */ +/* Internal Data Structures */ +/* */ +/* **************************************************************** */ + +/* Some defines describing details about Info file contents. */ + +/* String Constants. */ +#define INFO_FILE_LABEL "File:" +#define INFO_NODE_LABEL "Node:" +#define INFO_PREV_LABEL "Prev:" +#define INFO_ALTPREV_LABEL "Previous:" +#define INFO_NEXT_LABEL "Next:" +#define INFO_UP_LABEL "Up:" +#define INFO_MENU_LABEL "\n* Menu:" +#define INFO_MENU_ENTRY_LABEL "\n* " +#define INFO_XREF_LABEL "*Note" +#define TAGS_TABLE_END_LABEL "\nEnd Tag Table" +#define TAGS_TABLE_BEG_LABEL "Tag Table:\n" +#define INDIRECT_TAGS_TABLE_LABEL "Indirect:\n" +#define TAGS_TABLE_IS_INDIRECT_LABEL "(Indirect)" + +/* Character Constants. */ +#define INFO_COOKIE '\037' +#define INFO_FF '\014' +#define INFO_TAGSEP '\177' + +/* For each logical file that we have loaded, we keep a list of the names + of the nodes that are found in that file. A pointer to a node in an + info file is called a "tag". For split files, the tag pointer is + "indirect"; that is, the pointer also contains the name of the split + file where the node can be found. For non-split files, the filename + member in the structure below simply contains the name of the current + file. The following structure describes a single node within a file. */ +typedef struct { + char *filename; /* The file where this node can be found. */ + char *nodename; /* The node pointed to by this tag. */ + long nodestart; /* The offset of the start of this node. */ + long nodelen; /* The length of this node. */ +} TAG; + +/* The following structure is used to remember information about the contents + of Info files that we have loaded at least once before. The FINFO member + is present so that we can reload the file if it has been modified since + last being loaded. All of the arrays appearing within this structure + are NULL terminated, and each array which can change size has a + corresponding SLOTS member which says how many slots have been allocated + (with malloc ()) for this array. */ +typedef struct { + char *filename; /* The filename used to find this file. */ + char *fullpath; /* The full pathname of this info file. */ + struct stat finfo; /* Information about this file. */ + char *contents; /* The contents of this particular file. */ + long filesize; /* The number of bytes this file expands to. */ + char **subfiles; /* If non-null, the list of subfiles. */ + TAG **tags; /* If non-null, the indirect tags table. */ + int tags_slots; /* Number of slots allocated for TAGS. */ + int flags; /* Various flags. Mimics of N_* flags. */ +} FILE_BUFFER; + +/* **************************************************************** */ +/* */ +/* Externally Visible Functions */ +/* */ +/* **************************************************************** */ + +/* Array of FILE_BUFFER * which represents the currently loaded info files. */ +extern FILE_BUFFER **info_loaded_files; + +/* The number of slots currently allocated to INFO_LOADED_FILES. */ +extern int info_loaded_files_slots; + +/* Locate the file named by FILENAME, and return the information structure + describing this file. The file may appear in our list of loaded files + already, or it may not. If it does not already appear, find the file, + and add it to the list of loaded files. If the file cannot be found, + return a NULL FILE_BUFFER *. */ +extern FILE_BUFFER *info_find_file (); + +/* Force load the file named FILENAME, and return the information structure + describing this file. Even if the file was already loaded, this loads + a new buffer, rebuilds tags and nodes, and returns a new FILE_BUFFER *. */ +extern FILE_BUFFER *info_load_file (); + +/* Return a pointer to a NODE structure for the Info node (FILENAME)NODENAME. + FILENAME can be passed as NULL, in which case the filename of "dir" is used. + NODENAME can be passed as NULL, in which case the nodename of "Top" is used. + If the node cannot be found, return a NULL pointer. */ +extern NODE *info_get_node (); + +/* Return a pointer to a NODE structure for the Info node NODENAME in + FILE_BUFFER. NODENAME can be passed as NULL, in which case the + nodename of "Top" is used. If the node cannot be found, return a + NULL pointer. */ +extern NODE *info_get_node_of_file_buffer (); + +/* Grovel FILE_BUFFER->contents finding tags and nodes, and filling in the + various slots. This can also be used to rebuild a tag or node table. */ +extern void build_tags_and_nodes (); + +/* When non-zero, this is a string describing the most recent file error. */ +extern char *info_recent_file_error; + +/* Create a new, empty file buffer. */ +extern FILE_BUFFER *make_file_buffer (); + +#endif /* !_NODES_H_ */
new file mode 100644 --- /dev/null +++ b/info/search.c @@ -0,0 +1,519 @@ +/* search.c -- How to search large bodies of text. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include <ctype.h> +#include <sys/types.h> +#include <sys/stat.h> +#include "general.h" +#include "search.h" +#include "nodes.h" + +#if !defined (NULL) +# define NULL 0x0 +#endif /* !NULL */ + +/* The search functions take two arguments: + + 1) a string to search for, and + + 2) a pointer to a SEARCH_BINDING which contains the buffer, start, + and end of the search. + + They return a long, which is the offset from the start of the buffer + at which the match was found. An offset of -1 indicates failure. */ + +/* A function which makes a binding with buffer and bounds. */ +SEARCH_BINDING * +make_binding (buffer, start, end) + char *buffer; + long start, end; +{ + SEARCH_BINDING *binding; + + binding = (SEARCH_BINDING *)xmalloc (sizeof (SEARCH_BINDING)); + binding->buffer = buffer; + binding->start = start; + binding->end = end; + binding->flags = 0; + + return (binding); +} + +/* Make a copy of BINDING without duplicating the data. */ +SEARCH_BINDING * +copy_binding (binding) + SEARCH_BINDING *binding; +{ + SEARCH_BINDING *copy; + + copy = make_binding (binding->buffer, binding->start, binding->end); + copy->flags = binding->flags; + return (copy); +} + + +/* **************************************************************** */ +/* */ +/* The Actual Searching Functions */ +/* */ +/* **************************************************************** */ + +/* Search forwards or backwards for the text delimited by BINDING. + The search is forwards if BINDING->start is greater than BINDING->end. */ +long +search (string, binding) + char *string; + SEARCH_BINDING *binding; +{ + long result; + + /* If the search is backwards, then search backwards, otherwise forwards. */ + if (binding->start > binding->end) + result = search_backward (string, binding); + else + result = search_forward (string, binding); + + return (result); +} + +/* Search forwards for STRING through the text delimited in BINDING. */ +long +search_forward (string, binding) + char *string; + SEARCH_BINDING *binding; +{ + register int c, i, len; + register char *buff, *end; + char *alternate = (char *)NULL; + + len = strlen (string); + + /* We match characters in the search buffer against STRING and ALTERNATE. + ALTERNATE is a case reversed version of STRING; this is cheaper than + case folding each character before comparison. Alternate is only + used if the case folding bit is turned on in the passed BINDING. */ + + if (binding->flags & S_FoldCase) + { + alternate = strdup (string); + + for (i = 0; i < len; i++) + { + if (islower (alternate[i])) + alternate[i] = toupper (alternate[i]); + else if (isupper (alternate[i])) + alternate[i] = tolower (alternate[i]); + } + } + + buff = binding->buffer + binding->start; + end = binding->buffer + binding->end + 1; + + while (buff < (end - len)) + { + for (i = 0; i < len; i++) + { + c = buff[i]; + + if ((c != string[i]) && (!alternate || c != alternate[i])) + break; + } + + if (!string[i]) + { + if (alternate) + free (alternate); + if (binding->flags & S_SkipDest) + buff += len; + return ((long) (buff - binding->buffer)); + } + + buff++; + } + + if (alternate) + free (alternate); + + return ((long) -1); +} + +/* Search for STRING backwards through the text delimited in BINDING. */ +long +search_backward (input_string, binding) + char *input_string; + SEARCH_BINDING *binding; +{ + register int c, i, len; + register char *buff, *end; + char *string; + char *alternate = (char *)NULL; + + len = strlen (input_string); + + /* Reverse the characters in the search string. */ + string = (char *)xmalloc (1 + len); + for (c = 0, i = len - 1; input_string[c]; c++, i--) + string[i] = input_string[c]; + + string[c] = '\0'; + + /* We match characters in the search buffer against STRING and ALTERNATE. + ALTERNATE is a case reversed version of STRING; this is cheaper than + case folding each character before comparison. ALTERNATE is only + used if the case folding bit is turned on in the passed BINDING. */ + + if (binding->flags & S_FoldCase) + { + alternate = strdup (string); + + for (i = 0; i < len; i++) + { + if (islower (alternate[i])) + alternate[i] = toupper (alternate[i]); + else if (isupper (alternate[i])) + alternate[i] = tolower (alternate[i]); + } + } + + buff = binding->buffer + binding->start - 1; + end = binding->buffer + binding->end; + + while (buff > (end + len)) + { + for (i = 0; i < len; i++) + { + c = *(buff - i); + + if (c != string[i] && (alternate && c != alternate[i])) + break; + } + + if (!string[i]) + { + free (string); + if (alternate) + free (alternate); + + if (binding->flags & S_SkipDest) + buff -= len; + return ((long) (1 + (buff - binding->buffer))); + } + + buff--; + } + + free (string); + if (alternate) + free (alternate); + + return ((long) -1); +} + +/* Find STRING in LINE, returning the offset of the end of the string. + Return an offset of -1 if STRING does not appear in LINE. The search + is bound by the end of the line (i.e., either NEWLINE or 0). */ +int +string_in_line (string, line) + char *string, *line; +{ + register int end; + SEARCH_BINDING binding; + + /* Find the end of the line. */ + for (end = 0; line[end] && line[end] != '\n'; end++); + + /* Search for STRING within these confines. */ + binding.buffer = line; + binding.start = 0; + binding.end = end; + binding.flags = S_FoldCase | S_SkipDest; + + return (search_forward (string, &binding)); +} + +/* Return non-zero if STRING is the first text to appear at BINDING. */ +int +looking_at (string, binding) + char *string; + SEARCH_BINDING *binding; +{ + long search_end; + + search_end = search (string, binding); + + /* If the string was not found, SEARCH_END is -1. If the string was found, + but not right away, SEARCH_END is != binding->start. Otherwise, the + string was found at binding->start. */ + return (search_end == binding->start); +} + +/* **************************************************************** */ +/* */ +/* Small String Searches */ +/* */ +/* **************************************************************** */ + +/* Function names that start with "skip" are passed a string, and return + an offset from the start of that string. Function names that start + with "find" are passed a SEARCH_BINDING, and return an absolute position + marker of the item being searched for. "Find" functions return a value + of -1 if the item being looked for couldn't be found. */ + +/* Return the index of the first non-whitespace character in STRING. */ +int +skip_whitespace (string) + char *string; +{ + register int i; + + for (i = 0; string && whitespace (string[i]); i++); + return (i); +} + +/* Return the index of the first non-whitespace or newline character in + STRING. */ +int +skip_whitespace_and_newlines (string) + char *string; +{ + register int i; + + for (i = 0; string && (whitespace (string[i]) || string[i] == '\n'); i++); + return (i); +} + +/* Return the index of the first whitespace character in STRING. */ +int +skip_non_whitespace (string) + char *string; +{ + register int i; + + for (i = 0; string && !whitespace (string[i]); i++); + return (i); +} + +/* Return the index of the first non-node character in STRING. Note that + this function contains quite a bit of hair to ignore periods in some + special cases. This is because we here at GNU ship some info files which + contain nodenames that contain periods. No such nodename can start with + a period, or continue with whitespace, newline, or ')' immediately following + the period. If second argument NEWLINES_OKAY is non-zero, newlines should + be skipped while parsing out the nodename specification. */ +int +skip_node_characters (string, newlines_okay) + char *string; + int newlines_okay; +{ + register int c, i = 0; + int paren_seen = 0; + int paren = 0; + + /* Handle special case. This is when another function has parsed out the + filename component of the node name, and we just want to parse out the + nodename proper. In that case, a period at the start of the nodename + indicates an empty nodename. */ + if (string && *string == '.') + return (0); + + if (string && *string == '(') + { + paren++; + paren_seen++; + i++; + } + + for (; string && (c = string[i]); i++) + { + if (paren) + { + if (c == '(') + paren++; + else if (c == ')') + paren--; + + continue; + } + + /* If the character following the close paren is a space or period, + then this node name has no more characters associated with it. */ + if (c == '\t' || + c == ',' || + c == INFO_TAGSEP || + ((!newlines_okay) && (c == '\n')) || + ((paren_seen && string[i - 1] == ')') && + (c == ' ' || c == '.')) || + (c == '.' && + ((!string[i + 1]) || + (whitespace_or_newline (string[i + 1])) || + (string[i + 1] == ')')))) + break; + } + return (i); +} + + +/* **************************************************************** */ +/* */ +/* Searching FILE_BUFFER's */ +/* */ +/* **************************************************************** */ + +/* Return the absolute position of the first occurence of a node separator in + BINDING-buffer. The search starts at BINDING->start. Return -1 if no node + separator was found. */ +long +find_node_separator (binding) + SEARCH_BINDING *binding; +{ + register long i; + char *body; + + body = binding->buffer; + + /* A node is started by [^L]^_[^L]\n. That is to say, the C-l's are + optional, but the DELETE and NEWLINE are not. This separator holds + true for all separated elements in an Info file, including the tags + table (if present) and the indirect tags table (if present). */ + for (i = binding->start; i < binding->end - 1; i++) + if (((body[i] == INFO_FF && body[i + 1] == INFO_COOKIE) && + (body[i + 2] == '\n' || + (body[i + 2] == INFO_FF && body[i + 3] == '\n'))) || + ((body[i] == INFO_COOKIE) && + (body[i + 1] == '\n' || + (body[i + 1] == INFO_FF && body[i + 2] == '\n')))) + return (i); + return (-1); +} + +/* Return the length of the node separator characters that BODY is + currently pointing at. */ +int +skip_node_separator (body) + char *body; +{ + register int i; + + i = 0; + + if (body[i] == INFO_FF) + i++; + + if (body[i++] != INFO_COOKIE) + return (0); + + if (body[i] == INFO_FF) + i++; + + if (body[i++] != '\n') + return (0); + + return (i); +} + +/* Return the number of characters from STRING to the start of + the next line. */ +int +skip_line (string) + char *string; +{ + register int i; + + for (i = 0; string && string[i] && string[i] != '\n'; i++); + + if (string[i] == '\n') + i++; + + return (i); +} + +/* Return the absolute position of the beginning of a tags table in this + binding starting the search at binding->start. */ +long +find_tags_table (binding) + SEARCH_BINDING *binding; +{ + SEARCH_BINDING search; + long position; + + search.buffer = binding->buffer; + search.start = binding->start; + search.end = binding->end; + search.flags = S_FoldCase; + + while ((position = find_node_separator (&search)) != -1 ) + { + search.start = position; + search.start += skip_node_separator (search.buffer + search.start); + + if (looking_at (TAGS_TABLE_BEG_LABEL, &search)) + return (position); + } + return (-1); +} + +/* Return the absolute position of the node named NODENAME in BINDING. + This is a brute force search, and we wish to avoid it when possible. + This function is called when a tag (indirect or otherwise) doesn't + really point to the right node. It returns the absolute position of + the separator preceding the node. */ +long +find_node_in_binding (nodename, binding) + char *nodename; + SEARCH_BINDING *binding; +{ + register long position; + register int offset, namelen; + SEARCH_BINDING search; + + namelen = strlen (nodename); + + search.buffer = binding->buffer; + search.start = binding->start; + search.end = binding->end; + search.flags = 0; + + while ((position = find_node_separator (&search)) != -1) + { + search.start = position; + search.start += skip_node_separator (search.buffer + search.start); + + offset = string_in_line (INFO_NODE_LABEL, search.buffer + search.start); + + if (offset == -1) + continue; + + search.start += offset; + search.start += skip_whitespace (search.buffer + search.start); + offset = skip_node_characters + (search.buffer + search.start, DONT_SKIP_NEWLINES); + + /* Notice that this is an exact match. You cannot grovel through + the buffer with this function looking for random nodes. */ + if ((offset == namelen) && + (search.buffer[search.start] == nodename[0]) && + (strncmp (search.buffer + search.start, nodename, offset) == 0)) + return (position); + } + return (-1); +}
new file mode 100644 --- /dev/null +++ b/info/search.h @@ -0,0 +1,75 @@ +/* search.h -- Structure used to search large bodies of text, with bounds. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +/* The search functions take two arguments: + + 1) a string to search for, and + + 2) a pointer to a SEARCH_BINDING which contains the buffer, start, + and end of the search. + + They return a long, which is the offset from the start of the buffer + at which the match was found. An offset of -1 indicates failure. */ + +#if !defined (_SEARCH_H_) +#define _SEARCH_H_ + +typedef struct { + char *buffer; /* The buffer of text to search. */ + long start; /* Offset of the start of the search. */ + long end; /* Offset of the end of the searh. */ + int flags; /* Flags controlling the type of search. */ +} SEARCH_BINDING; + +#define S_FoldCase 0x01 /* Set means fold case in searches. */ +#define S_SkipDest 0x02 /* Set means return pointing after the dest. */ + +SEARCH_BINDING *make_binding (), *copy_binding (); +extern long search_forward (), search_backward (), search (); +extern int looking_at (); + +/* Note that STRING_IN_LINE () always returns the offset of the 1st character + after the string. */ +extern int string_in_line (); + +/* Some unixes don't have strcasecmp or strncasecmp. */ +#if !defined (HAVE_STRCASECMP) +extern int strcasecmp (), strncasecmp (); +#endif /* !HAVE_STRCASECMP */ + +/* Function names that start with "skip" are passed a string, and return + an offset from the start of that string. Function names that start + with "find" are passed a SEARCH_BINDING, and return an absolute position + marker of the item being searched for. "Find" functions return a value + of -1 if the item being looked for couldn't be found. */ +extern int skip_whitespace (), skip_non_whitespace (); +extern int skip_whitespace_and_newlines (), skip_line (); +extern int skip_node_characters (), skip_node_separator (); +#define DONT_SKIP_NEWLINES 0 +#define SKIP_NEWLINES 1 + +extern long find_node_separator (), find_tags_table (); +extern long find_node_in_binding (); + +#endif /* !_SEARCH_H_ */ +
new file mode 100644 --- /dev/null +++ b/info/session.c @@ -0,0 +1,4267 @@ +/* session.c -- The user windowing interface to Info. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993, 96 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include "info.h" +#if defined (HAVE_SYS_FILE_H) +#include <sys/file.h> +#endif /* HAVE_SYS_FILE_H */ +#include <sys/ioctl.h> +#include <fcntl.h> + +#if defined (HAVE_SYS_TIME_H) +# include <sys/time.h> +# define HAVE_STRUCT_TIMEVAL +#endif /* HAVE_SYS_TIME_H */ + +#if defined (HANDLE_MAN_PAGES) +# include "man.h" +#endif + +static void info_clear_pending_input (), info_set_pending_input (); +static void info_handle_pointer (); + +/* **************************************************************** */ +/* */ +/* Running an Info Session */ +/* */ +/* **************************************************************** */ + +/* The place that we are reading input from. */ +static FILE *info_input_stream = (FILE *)NULL; + +/* The last executed command. */ +VFunction *info_last_executed_command = (VFunction *)NULL; + +/* Becomes non-zero when 'q' is typed to an Info window. */ +int quit_info_immediately = 0; + +/* Array of structures describing for each window which nodes have been + visited in that window. */ +INFO_WINDOW **info_windows = (INFO_WINDOW **)NULL; + +/* Where to add the next window, if we need to add one. */ +static int info_windows_index = 0; + +/* Number of slots allocated to INFO_WINDOWS. */ +static int info_windows_slots = 0; + +void remember_window_and_node (), forget_window_and_nodes (); +void initialize_info_session (), info_session (); +void display_startup_message_and_start (); + +/* Begin an info session finding the nodes specified by FILENAME and NODENAMES. + For each loaded node, create a new window. Always split the largest of the + available windows. */ +void +begin_multiple_window_info_session (filename, nodenames) + char *filename; + char **nodenames; +{ + register int i; + WINDOW *window = (WINDOW *)NULL; + + for (i = 0; nodenames[i]; i++) + { + NODE *node; + + node = info_get_node (filename, nodenames[i]); + + if (!node) + break; + + /* If this is the first node, initialize the info session. */ + if (!window) + { + initialize_info_session (node, 1); + window = active_window; + } + else + { + /* Find the largest window in WINDOWS, and make that be the active + one. Then split it and add our window and node to the list + of remembered windows and nodes. Then tile the windows. */ + register WINDOW *win, *largest = (WINDOW *)NULL; + int max_height = 0; + + for (win = windows; win; win = win->next) + if (win->height > max_height) + { + max_height = win->height; + largest = win; + } + + if (!largest) + { + display_update_display (windows); + info_error (CANT_FIND_WIND); + info_session (); + exit (0); + } + + active_window = largest; + window = window_make_window (node); + if (window) + { + window_tile_windows (TILE_INTERNALS); + remember_window_and_node (window, node); + } + else + { + display_update_display (windows); + info_error (WIN_TOO_SMALL); + info_session (); + exit (0); + } + } + } + display_startup_message_and_start (); +} + +/* Start an info session with INITIAL_NODE, and an error message in the echo + area made from FORMAT and ARG. */ +void +begin_info_session_with_error (initial_node, format, arg) + NODE *initial_node; + char *format; + void *arg; +{ + initialize_info_session (initial_node, 1); + info_error (format, arg, (void *)NULL); + info_session (); +} + +/* Start an info session with INITIAL_NODE. */ +void +begin_info_session (initial_node) + NODE *initial_node; +{ + initialize_info_session (initial_node, 1); + display_startup_message_and_start (); +} + +void +display_startup_message_and_start () +{ + char *format; + + format = replace_in_documentation + ("Welcome to Info version %s. \"\\[get-help-window]\" for help, \"\\[menu-item]\" for menu item."); + + window_message_in_echo_area (format, version_string ()); + info_session (); +} + +/* Run an info session with an already initialized window and node. */ +void +info_session () +{ + terminal_prep_terminal (); + display_update_display (windows); + info_last_executed_command = (VFunction *)NULL; + info_read_and_dispatch (); + /* On program exit, leave the cursor at the bottom of the window, and + restore the terminal I/O. */ + terminal_goto_xy (0, screenheight - 1); + terminal_clear_to_eol (); + fflush (stdout); + terminal_unprep_terminal (); + close_dribble_file (); +} + +/* Here is a window-location dependent event loop. Called from the + functions info_session (), and from read_xxx_in_echo_area (). */ +void +info_read_and_dispatch () +{ + unsigned char key; + int done; + done = 0; + + while (!done && !quit_info_immediately) + { + int lk; + + /* If we haven't just gone up or down a line, there is no + goal column for this window. */ + if ((info_last_executed_command != info_next_line) && + (info_last_executed_command != info_prev_line)) + active_window->goal_column = -1; + + if (echo_area_is_active) + { + lk = echo_area_last_command_was_kill; + echo_area_prep_read (); + } + + if (!info_any_buffered_input_p ()) + display_update_display (windows); + + display_cursor_at_point (active_window); + info_initialize_numeric_arg (); + + initialize_keyseq (); + key = info_get_input_char (); + + /* No errors yet. We just read a character, that's all. Only clear + the echo_area if it is not currently active. */ + if (!echo_area_is_active) + window_clear_echo_area (); + + info_error_was_printed = 0; + + /* Do the selected command. */ + info_dispatch_on_key (key, active_window->keymap); + + if (echo_area_is_active) + { + /* Echo area commands that do killing increment the value of + ECHO_AREA_LAST_COMMAND_WAS_KILL. Thus, if there is no + change in the value of this variable, the last command + executed was not a kill command. */ + if (lk == echo_area_last_command_was_kill) + echo_area_last_command_was_kill = 0; + + if (ea_last_executed_command == ea_newline || + info_aborted_echo_area) + { + ea_last_executed_command = (VFunction *)NULL; + done = 1; + } + + if (info_last_executed_command == info_quit) + quit_info_immediately = 1; + } + else if (info_last_executed_command == info_quit) + done = 1; + } +} + +/* Found in signals.c */ +extern void initialize_info_signal_handler (); + +/* Initialize the first info session by starting the terminal, window, + and display systems. If CLEAR_SCREEN is 0, don't clear the + screen. */ +void +initialize_info_session (node, clear_screen) + NODE *node; + int clear_screen; +{ + char *getenv (), *term_name; + + term_name = getenv ("TERM"); + terminal_initialize_terminal (term_name); + + if (terminal_is_dumb_p) + { + if (!term_name) + term_name = "dumb"; + + info_error (TERM_TOO_DUMB, term_name); + exit (1); + } + + if (clear_screen) + terminal_clear_screen (); + + initialize_info_keymaps (); + window_initialize_windows (screenwidth, screenheight); + initialize_info_signal_handler (); + display_initialize_display (screenwidth, screenheight); + info_set_node_of_window (active_window, node); + + /* Tell the window system how to notify us when a window needs to be + asynchronously deleted (e.g., user resizes window very small). */ + window_deletion_notifier = forget_window_and_nodes; + + /* If input has not been redirected yet, make it come from STDIN. */ + if (!info_input_stream) + info_input_stream = stdin; + + info_windows_initialized_p = 1; +} + +/* Tell Info that input is coming from the file FILENAME. */ +void +info_set_input_from_file (filename) + char *filename; +{ + FILE *stream; + + stream = fopen (filename, "r"); + + if (!stream) + return; + + if ((info_input_stream != (FILE *)NULL) && + (info_input_stream != stdin)) + fclose (info_input_stream); + + info_input_stream = stream; + + if (stream != stdin) + display_inhibited = 1; +} + +/* Return the INFO_WINDOW containing WINDOW, or NULL if there isn't one. */ +static INFO_WINDOW * +get_info_window_of_window (window) + WINDOW *window; +{ + register int i; + INFO_WINDOW *info_win = (INFO_WINDOW *)NULL; + + for (i = 0; info_windows && (info_win = info_windows[i]); i++) + if (info_win->window == window) + break; + + return (info_win); +} + +/* Reset the remembered pagetop and point of WINDOW to WINDOW's current + values if the window and node are the same as the current one being + displayed. */ +void +set_remembered_pagetop_and_point (window) + WINDOW *window; +{ + INFO_WINDOW *info_win; + + info_win = get_info_window_of_window (window); + + if (!info_win) + return; + + if (info_win->nodes_index && + (info_win->nodes[info_win->current] == window->node)) + { + info_win->pagetops[info_win->current] = window->pagetop; + info_win->points[info_win->current] = window->point; + } +} + +void +remember_window_and_node (window, node) + WINDOW *window; + NODE *node; +{ + INFO_WINDOW *info_win; + + /* See if we already have this window in our list. */ + info_win = get_info_window_of_window (window); + + /* If the window wasn't already on our list, then make a new entry. */ + if (!info_win) + { + info_win = (INFO_WINDOW *)xmalloc (sizeof (INFO_WINDOW)); + info_win->window = window; + info_win->nodes = (NODE **)NULL; + info_win->pagetops = (int *)NULL; + info_win->points = (long *)NULL; + info_win->current = 0; + info_win->nodes_index = 0; + info_win->nodes_slots = 0; + + add_pointer_to_array (info_win, info_windows_index, info_windows, + info_windows_slots, 10, INFO_WINDOW *); + } + + /* If this node, the current pagetop, and the current point are the + same as the last saved node and pagetop, don't really add this to + the list of history nodes. */ + { + int ni = info_win->nodes_index - 1; + + if ((ni != -1) && + (info_win->nodes[ni]->contents == node->contents) && + (info_win->pagetops[ni] == window->pagetop) && + (info_win->points[ni] == window->point)) + return; + } + + /* Remember this node, the currently displayed pagetop, and the current + location of point in this window. Because we are updating pagetops + and points as well as nodes, it is more efficient to avoid the + add_pointer_to_array macro here. */ + if (info_win->nodes_index + 2 >= info_win->nodes_slots) + { + info_win->nodes = (NODE **) + xrealloc (info_win->nodes, + (info_win->nodes_slots += 20) * sizeof (NODE *)); + + info_win->pagetops = (int *) + xrealloc (info_win->pagetops, info_win->nodes_slots * sizeof (int)); + + info_win->points = (long *) + xrealloc (info_win->points, info_win->nodes_slots * sizeof (long)); + } + + info_win->nodes[info_win->nodes_index] = node; + info_win->pagetops[info_win->nodes_index] = window->pagetop; + info_win->points[info_win->nodes_index] = window->point; + info_win->current = info_win->nodes_index++; + info_win->nodes[info_win->nodes_index] = (NODE *)NULL; + info_win->pagetops[info_win->nodes_index] = 0; + info_win->points[info_win->nodes_index] = 0; +} + +#define DEBUG_FORGET_WINDOW_AND_NODES +#if defined (DEBUG_FORGET_WINDOW_AND_NODES) +static void +consistency_check_info_windows () +{ + register int i; + INFO_WINDOW *info_win; + + for (i = 0; i < info_windows_index; i++) + { + WINDOW *win; + + for (win = windows; win; win = win->next) + if (win == info_windows[i]->window) + break; + + if (!win) + abort (); + } +} +#endif /* DEBUG_FORGET_WINDOW_AND_NODES */ + +/* Remove WINDOW and its associated list of nodes from INFO_WINDOWS. */ +void +forget_window_and_nodes (window) + WINDOW *window; +{ + register int i; + INFO_WINDOW *info_win = (INFO_WINDOW *)NULL; + + for (i = 0; info_windows && (info_win = info_windows[i]); i++) + if (info_win->window == window) + break; + + /* If we found the window to forget, then do so. */ + if (info_win) + { + while (i < info_windows_index) + { + info_windows[i] = info_windows[i + 1]; + i++; + } + + info_windows_index--; + info_windows[info_windows_index] = (INFO_WINDOW *)NULL; + + if (info_win->nodes) + { + /* Free the node structures which held onto internal node contents + here. This doesn't free the contents; we have a garbage collector + which does that. */ + for (i = 0; info_win->nodes[i]; i++) + if (internal_info_node_p (info_win->nodes[i])) + free (info_win->nodes[i]); + free (info_win->nodes); + + maybe_free (info_win->pagetops); + maybe_free (info_win->points); + } + + free (info_win); + } +#if defined (DEBUG_FORGET_WINDOW_AND_NODES) + consistency_check_info_windows (); +#endif /* DEBUG_FORGET_WINDOW_AND_NODES */ +} + +/* Set WINDOW to show NODE. Remember the new window in our list of Info + windows. If we are doing automatic footnote display, also try to display + the footnotes for this window. */ +void +info_set_node_of_window (window, node) + WINDOW *window; + NODE *node; +{ + /* Put this node into the window. */ + window_set_node_of_window (window, node); + + /* Remember this node and window in our list of info windows. */ + remember_window_and_node (window, node); + + /* If doing auto-footnote display/undisplay, show the footnotes belonging + to this window's node. */ + if (auto_footnotes_p) + info_get_or_remove_footnotes (window); +} + + +/* **************************************************************** */ +/* */ +/* Info Movement Commands */ +/* */ +/* **************************************************************** */ + +/* Change the pagetop of WINDOW to DESIRED_TOP, perhaps scrolling the screen + to do so. */ +void +set_window_pagetop (window, desired_top) + WINDOW *window; + int desired_top; +{ + int point_line, old_pagetop; + + if (desired_top < 0) + desired_top = 0; + else if (desired_top > window->line_count) + desired_top = window->line_count - 1; + + if (window->pagetop == desired_top) + return; + + old_pagetop = window->pagetop; + window->pagetop = desired_top; + + /* Make sure that point appears in this window. */ + point_line = window_line_of_point (window); + if ((point_line < window->pagetop) || + ((point_line - window->pagetop) > window->height - 1)) + window->point = + window->line_starts[window->pagetop] - window->node->contents; + + window->flags |= W_UpdateWindow; + + /* Find out which direction to scroll, and scroll the window in that + direction. Do this only if there would be a savings in redisplay + time. This is true if the amount to scroll is less than the height + of the window, and if the number of lines scrolled would be greater + than 10 % of the window's height. */ + if (old_pagetop < desired_top) + { + int start, end, amount; + + amount = desired_top - old_pagetop; + + if ((amount >= window->height) || + (((window->height - amount) * 10) < window->height)) + return; + + start = amount + window->first_row; + end = window->height + window->first_row; + + display_scroll_display (start, end, -amount); + } + else + { + int start, end, amount; + + amount = old_pagetop - desired_top; + + if ((amount >= window->height) || + (((window->height - amount) * 10) < window->height)) + return; + + start = window->first_row; + end = (window->first_row + window->height) - amount; + display_scroll_display (start, end, amount); + } +} + +/* Immediately make WINDOW->point visible on the screen, and move the + terminal cursor there. */ +static void +info_show_point (window) + WINDOW *window; +{ + int old_pagetop; + + old_pagetop = window->pagetop; + window_adjust_pagetop (window); + if (old_pagetop != window->pagetop) + { + int new_pagetop; + + new_pagetop = window->pagetop; + window->pagetop = old_pagetop; + set_window_pagetop (window, new_pagetop); + } + + if (window->flags & W_UpdateWindow) + display_update_one_window (window); + + display_cursor_at_point (window); +} + +/* Move WINDOW->point from OLD line index to NEW line index. */ +static void +move_to_new_line (old, new, window) + int old, new; + WINDOW *window; +{ + if (old == -1) + { + info_error (CANT_FIND_POINT); + } + else + { + int goal; + + if (new >= window->line_count || new < 0) + return; + + goal = window_get_goal_column (window); + window->goal_column = goal; + + window->point = window->line_starts[new] - window->node->contents; + window->point += window_chars_to_goal (window->line_starts[new], goal); + info_show_point (window); + } +} + +/* Move WINDOW's point down to the next line if possible. */ +DECLARE_INFO_COMMAND (info_next_line, "Move down to the next line") +{ + int old_line, new_line; + + if (count < 0) + info_prev_line (window, -count, key); + else + { + old_line = window_line_of_point (window); + new_line = old_line + count; + move_to_new_line (old_line, new_line, window); + } +} + +/* Move WINDOW's point up to the previous line if possible. */ +DECLARE_INFO_COMMAND (info_prev_line, "Move up to the previous line") +{ + int old_line, new_line; + + if (count < 0) + info_next_line (window, -count, key); + else + { + old_line = window_line_of_point (window); + new_line = old_line - count; + move_to_new_line (old_line, new_line, window); + } +} + +/* Move WINDOW's point to the end of the true line. */ +DECLARE_INFO_COMMAND (info_end_of_line, "Move to the end of the line") +{ + register int point, len; + register char *buffer; + + buffer = window->node->contents; + len = window->node->nodelen; + + for (point = window->point; + (point < len) && (buffer[point] != '\n'); + point++); + + if (point != window->point) + { + window->point = point; + info_show_point (window); + } +} + +/* Move WINDOW's point to the beginning of the true line. */ +DECLARE_INFO_COMMAND (info_beginning_of_line, "Move to the start of the line") +{ + register int point; + register char *buffer; + + buffer = window->node->contents; + point = window->point; + + for (; (point) && (buffer[point - 1] != '\n'); point--); + + /* If at a line start alreay, do nothing. */ + if (point != window->point) + { + window->point = point; + info_show_point (window); + } +} + +/* Move point forward in the node. */ +DECLARE_INFO_COMMAND (info_forward_char, "Move forward a character") +{ + if (count < 0) + info_backward_char (window, -count, key); + else + { + window->point += count; + + if (window->point >= window->node->nodelen) + window->point = window->node->nodelen - 1; + + info_show_point (window); + } +} + +/* Move point backward in the node. */ +DECLARE_INFO_COMMAND (info_backward_char, "Move backward a character") +{ + if (count < 0) + info_forward_char (window, -count, key); + else + { + window->point -= count; + + if (window->point < 0) + window->point = 0; + + info_show_point (window); + } +} + +#define alphabetic(c) (islower (c) || isupper (c) || isdigit (c)) + +/* Move forward a word in this node. */ +DECLARE_INFO_COMMAND (info_forward_word, "Move forward a word") +{ + long point; + char *buffer; + int end, c; + + if (count < 0) + { + info_backward_word (window, -count, key); + return; + } + + point = window->point; + buffer = window->node->contents; + end = window->node->nodelen; + + while (count) + { + if (point + 1 >= end) + return; + + /* If we are not in a word, move forward until we are in one. + Then, move forward until we hit a non-alphabetic character. */ + c = buffer[point]; + + if (!alphabetic (c)) + { + while (++point < end) + { + c = buffer[point]; + if (alphabetic (c)) + break; + } + } + + if (point >= end) return; + + while (++point < end) + { + c = buffer[point]; + if (!alphabetic (c)) + break; + } + --count; + } + window->point = point; + info_show_point (window); +} + +DECLARE_INFO_COMMAND (info_backward_word, "Move backward a word") +{ + long point; + char *buffer; + int c; + + if (count < 0) + { + info_forward_word (window, -count, key); + return; + } + + buffer = window->node->contents; + point = window->point; + + while (count) + { + if (point == 0) + break; + + /* Like info_forward_word (), except that we look at the + characters just before point. */ + + c = buffer[point - 1]; + + if (!alphabetic (c)) + { + while (--point) + { + c = buffer[point - 1]; + if (alphabetic (c)) + break; + } + } + + while (point) + { + c = buffer[point - 1]; + if (!alphabetic (c)) + break; + else + --point; + } + --count; + } + window->point = point; + info_show_point (window); +} + +/* Here is a list of time counter names which correspond to ordinal numbers. + It is used to print "once" instead of "1". */ +static char *counter_names[] = { + "not at all", "once", "twice", "three", "four", "five", "six", + (char *)NULL +}; + +/* Buffer used to return values from times_description (). */ +static char td_buffer[50]; + +/* Function returns a static string fully describing the number of times + present in COUNT. */ +static char * +times_description (count) + int count; +{ + register int i; + + td_buffer[0] = '\0'; + + for (i = 0; counter_names[i]; i++) + if (count == i) + break; + + if (counter_names[i]) + sprintf (td_buffer, "%s%s", counter_names[i], count > 2 ? " times" : ""); + else + sprintf (td_buffer, "%d times", count); + + return (td_buffer); +} + +/* Variable controlling the behaviour of default scrolling when you are + already at the bottom of a node. Possible values are defined in session.h. + The meanings are: + + IS_Continuous Try to get first menu item, or failing that, the + "Next:" pointer, or failing that, the "Up:" and + "Next:" of the up. + IS_NextOnly Try to get "Next:" menu item. + IS_PageOnly Simply give up at the bottom of a node. */ + +int info_scroll_behaviour = IS_Continuous; + +/* Choices used by the completer when reading a value for the user-visible + variable "scroll-behaviour". */ +char *info_scroll_choices[] = { + "Continuous", "Next Only", "Page Only", (char *)NULL +}; + +/* Move to 1st menu item, Next, Up/Next, or error in this window. */ +static void +forward_move_node_structure (window, behaviour) + WINDOW *window; + int behaviour; +{ + switch (behaviour) + { + case IS_PageOnly: + info_error (AT_NODE_BOTTOM); + break; + + case IS_NextOnly: + info_next_label_of_node (window->node); + if (!info_parsed_nodename && !info_parsed_filename) + info_error ("No \"Next\" pointer for this node."); + else + { + window_message_in_echo_area ("Following \"Next\" node..."); + info_handle_pointer ("Next", window); + } + break; + + case IS_Continuous: + { + /* First things first. If this node contains a menu, move down + into the menu. */ + { + REFERENCE **menu; + + menu = info_menu_of_node (window->node); + + if (menu) + { + info_free_references (menu); + window_message_in_echo_area ("Selecting first menu item..."); + info_menu_digit (window, 1, '1'); + return; + } + } + + /* Okay, this node does not contain a menu. If it contains a + "Next:" pointer, use that. */ + info_next_label_of_node (window->node); + if (info_label_was_found) + { + window_message_in_echo_area ("Selecting \"Next\" node..."); + info_handle_pointer ("Next", window); + return; + } + + /* Okay, there wasn't a "Next:" for this node. Move "Up:" until we + can move "Next:". If that isn't possible, complain that there + are no more nodes. */ + { + int up_counter, old_current; + INFO_WINDOW *info_win; + + /* Remember the current node and location. */ + info_win = get_info_window_of_window (window); + old_current = info_win->current; + + /* Back up through the "Up:" pointers until we have found a "Next:" + that isn't the same as the first menu item found in that node. */ + up_counter = 0; + while (!info_error_was_printed) + { + info_up_label_of_node (window->node); + if (info_label_was_found) + { + info_handle_pointer ("Up", window); + if (info_error_was_printed) + continue; + + up_counter++; + + info_next_label_of_node (window->node); + + /* If no "Next" pointer, keep backing up. */ + if (!info_label_was_found) + continue; + + /* If this node's first menu item is the same as this node's + Next pointer, keep backing up. */ + if (!info_parsed_filename) + { + REFERENCE **menu; + char *next_nodename; + + /* Remember the name of the Next node, since reading + the menu can overwrite the contents of the + info_parsed_xxx strings. */ + next_nodename = strdup (info_parsed_nodename); + + menu = info_menu_of_node (window->node); + if (menu && + (strcmp + (menu[0]->nodename, next_nodename) == 0)) + { + info_free_references (menu); + free (next_nodename); + continue; + } + else + { + /* Restore the world to where it was before + reading the menu contents. */ + info_free_references (menu); + free (next_nodename); + info_next_label_of_node (window->node); + } + } + + /* This node has a "Next" pointer, and it is not the + same as the first menu item found in this node. */ + window_message_in_echo_area + ("Moving \"Up\" %s, then \"Next\".", + times_description (up_counter)); + + info_handle_pointer ("Next", window); + return; + } + else + { + /* No more "Up" pointers. Print an error, and call it + quits. */ + register int i; + + for (i = 0; i < up_counter; i++) + { + info_win->nodes_index--; + free (info_win->nodes[info_win->nodes_index]); + info_win->nodes[info_win->nodes_index] = (NODE *)NULL; + } + info_win->current = old_current; + window->node = info_win->nodes[old_current]; + window->pagetop = info_win->pagetops[old_current]; + window->point = info_win->points[old_current]; + recalculate_line_starts (window); + window->flags |= W_UpdateWindow; + info_error ("No more nodes."); + } + } + } + break; + } + } +} + +/* Move Prev, Up or error in WINDOW depending on BEHAVIOUR. */ +static void +backward_move_node_structure (window, behaviour) + WINDOW *window; + int behaviour; +{ + switch (behaviour) + { + case IS_PageOnly: + info_error (AT_NODE_TOP); + break; + + case IS_NextOnly: + info_prev_label_of_node (window->node); + if (!info_parsed_nodename && !info_parsed_filename) + info_error ("No \"Prev\" for this node."); + else + { + window_message_in_echo_area ("Moving \"Prev\" in this window."); + info_handle_pointer ("Prev", window); + } + break; + + case IS_Continuous: + info_prev_label_of_node (window->node); + + if (!info_parsed_nodename && !info_parsed_filename) + { + info_up_label_of_node (window->node); + if (!info_parsed_nodename && !info_parsed_filename) + info_error ("No \"Prev\" or \"Up\" for this node."); + else + { + window_message_in_echo_area ("Moving \"Up\" in this window."); + info_handle_pointer ("Up", window); + } + } + else + { + REFERENCE **menu; + int inhibit_menu_traversing = 0; + + /* Watch out! If this node's Prev is the same as the Up, then + move Up. Otherwise, we could move Prev, and then to the last + menu item in the Prev. This would cause the user to loop + through a subsection of the info file. */ + if (!info_parsed_filename && info_parsed_nodename) + { + char *pnode; + + pnode = strdup (info_parsed_nodename); + info_up_label_of_node (window->node); + + if (!info_parsed_filename && info_parsed_nodename && + strcmp (info_parsed_nodename, pnode) == 0) + { + /* The nodes are the same. Inhibit moving to the last + menu item. */ + free (pnode); + inhibit_menu_traversing = 1; + } + else + { + free (pnode); + info_prev_label_of_node (window->node); + } + } + + /* Move to the previous node. If this node now contains a menu, + and we have not inhibited movement to it, move to the node + corresponding to the last menu item. */ + window_message_in_echo_area ("Moving \"Prev\" in this window."); + info_handle_pointer ("Prev", window); + + if (!inhibit_menu_traversing) + { + while (!info_error_was_printed && + (menu = info_menu_of_node (window->node))) + { + info_free_references (menu); + window_message_in_echo_area + ("Moving to \"Prev\"'s last menu item."); + info_menu_digit (window, 1, '0'); + } + } + } + break; + } +} + +/* Move continuously forward through the node structure of this info file. */ +DECLARE_INFO_COMMAND (info_global_next_node, + "Move forwards or down through node structure") +{ + if (count < 0) + info_global_prev_node (window, -count, key); + else + { + while (count && !info_error_was_printed) + { + forward_move_node_structure (window, IS_Continuous); + count--; + } + } +} + +/* Move continuously backward through the node structure of this info file. */ +DECLARE_INFO_COMMAND (info_global_prev_node, + "Move backwards or up through node structure") +{ + if (count < 0) + info_global_next_node (window, -count, key); + else + { + while (count && !info_error_was_printed) + { + backward_move_node_structure (window, IS_Continuous); + count--; + } + } +} + +/* Show the next screen of WINDOW's node. */ +DECLARE_INFO_COMMAND (info_scroll_forward, "Scroll forward in this window") +{ + if (count < 0) + info_scroll_backward (window, -count, key); + else + { + int desired_top; + + /* Without an explicit numeric argument, scroll the bottom two + lines to the top of this window, Or, if at bottom of window, + and the user wishes to scroll through nodes get the "Next" node + for this window. */ + if (!info_explicit_arg && count == 1) + { + desired_top = window->pagetop + (window->height - 2); + + /* If there are no more lines to scroll here, error, or get + another node, depending on INFO_SCROLL_BEHAVIOUR. */ + if (desired_top > window->line_count) + { + int behaviour = info_scroll_behaviour; + + /* Here is a hack. If the key being used is not SPC, do the + PageOnly behaviour. */ + if (key != SPC && key != DEL) + behaviour = IS_PageOnly; + + forward_move_node_structure (window, behaviour); + return; + } + } + else + desired_top = window->pagetop + count; + + if (desired_top >= window->line_count) + desired_top = window->line_count - 2; + + if (window->pagetop > desired_top) + return; + else + set_window_pagetop (window, desired_top); + } +} + +/* Show the previous screen of WINDOW's node. */ +DECLARE_INFO_COMMAND (info_scroll_backward, "Scroll backward in this window") +{ + if (count < 0) + info_scroll_forward (window, -count, key); + else + { + int desired_top; + + /* Without an explicit numeric argument, scroll the top two lines + to the bottom of this window, or move to the previous, or Up'th + node. */ + if (!info_explicit_arg && count == 1) + { + desired_top = window->pagetop - (window->height - 2); + + if ((desired_top < 0) && (window->pagetop == 0)) + { + int behaviour = info_scroll_behaviour; + + /* Same kind of hack as in info_scroll_forward. If the key + used to invoke this command is not DEL, do only the PageOnly + behaviour. */ + if (key != DEL && key != SPC) + behaviour = IS_PageOnly; + + backward_move_node_structure (window, behaviour); + return; + } + } + else + desired_top = window->pagetop - count; + + if (desired_top < 0) + desired_top = 0; + + set_window_pagetop (window, desired_top); + } +} + +/* Move to the beginning of the node. */ +DECLARE_INFO_COMMAND (info_beginning_of_node, "Move to the start of this node") +{ + window->pagetop = window->point = 0; + window->flags |= W_UpdateWindow; +} + +/* Move to the end of the node. */ +DECLARE_INFO_COMMAND (info_end_of_node, "Move to the end of this node") +{ + window->point = window->node->nodelen - 1; + info_show_point (window); +} + +/* **************************************************************** */ +/* */ +/* Commands for Manipulating Windows */ +/* */ +/* **************************************************************** */ + +/* Make the next window in the chain be the active window. */ +DECLARE_INFO_COMMAND (info_next_window, "Select the next window") +{ + if (count < 0) + { + info_prev_window (window, -count, key); + return; + } + + /* If no other window, error now. */ + if (!windows->next && !echo_area_is_active) + { + info_error (ONE_WINDOW); + return; + } + + while (count--) + { + if (window->next) + window = window->next; + else + { + if (window == the_echo_area || !echo_area_is_active) + window = windows; + else + window = the_echo_area; + } + } + + if (active_window != window) + { + if (auto_footnotes_p) + info_get_or_remove_footnotes (window); + + window->flags |= W_UpdateWindow; + active_window = window; + } +} + +/* Make the previous window in the chain be the active window. */ +DECLARE_INFO_COMMAND (info_prev_window, "Select the previous window") +{ + if (count < 0) + { + info_next_window (window, -count, key); + return; + } + + /* Only one window? */ + + if (!windows->next && !echo_area_is_active) + { + info_error (ONE_WINDOW); + return; + } + + while (count--) + { + /* If we are in the echo area, or if the echo area isn't active and we + are in the first window, find the last window in the chain. */ + if (window == the_echo_area || + (window == windows && !echo_area_is_active)) + { + register WINDOW *win, *last; + + for (win = windows; win; win = win->next) + last = win; + + window = last; + } + else + { + if (window == windows) + window = the_echo_area; + else + window = window->prev; + } + } + + if (active_window != window) + { + if (auto_footnotes_p) + info_get_or_remove_footnotes (window); + + window->flags |= W_UpdateWindow; + active_window = window; + } +} + +/* Split WINDOW into two windows, both showing the same node. If we + are automatically tiling windows, re-tile after the split. */ +DECLARE_INFO_COMMAND (info_split_window, "Split the current window") +{ + WINDOW *split, *old_active; + int pagetop; + + /* Remember the current pagetop of the window being split. If it doesn't + change, we can scroll its contents around after the split. */ + pagetop = window->pagetop; + + /* Make the new window. */ + old_active = active_window; + active_window = window; + split = window_make_window (window->node); + active_window = old_active; + + if (!split) + { + info_error (WIN_TOO_SMALL); + } + else + { +#if defined (SPLIT_BEFORE_ACTIVE) + /* Try to scroll the old window into its new postion. */ + if (pagetop == window->pagetop) + { + int start, end, amount; + + start = split->first_row; + end = start + window->height; + amount = split->height + 1; + display_scroll_display (start, end, amount); + } +#else /* !SPLIT_BEFORE_ACTIVE */ + /* Make sure point still appears in the active window. */ + info_show_point (window); +#endif /* !SPLIT_BEFORE_ACTIVE */ + + /* If the window just split was one internal to Info, try to display + something else in it. */ + if (internal_info_node_p (split->node)) + { + register int i, j; + INFO_WINDOW *iw; + NODE *node = (NODE *)NULL; + char *filename; + + for (i = 0; iw = info_windows[i]; i++) + { + for (j = 0; j < iw->nodes_index; j++) + if (!internal_info_node_p (iw->nodes[j])) + { + if (iw->nodes[j]->parent) + filename = iw->nodes[j]->parent; + else + filename = iw->nodes[j]->filename; + + node = info_get_node (filename, iw->nodes[j]->nodename); + if (node) + { + window_set_node_of_window (split, node); + i = info_windows_index - 1; + break; + } + } + } + } + split->pagetop = window->pagetop; + + if (auto_tiling_p) + window_tile_windows (DONT_TILE_INTERNALS); + else + window_adjust_pagetop (split); + + remember_window_and_node (split, split->node); + } +} + +/* Delete WINDOW, forgetting the list of last visited nodes. If we are + automatically displaying footnotes, show or remove the footnotes + window. If we are automatically tiling windows, re-tile after the + deletion. */ +DECLARE_INFO_COMMAND (info_delete_window, "Delete the current window") +{ + if (!windows->next) + { + info_error (CANT_KILL_LAST); + } + else if (window->flags & W_WindowIsPerm) + { + info_error ("Cannot delete a permanent window"); + } + else + { + info_delete_window_internal (window); + + if (auto_footnotes_p) + info_get_or_remove_footnotes (active_window); + + if (auto_tiling_p) + window_tile_windows (DONT_TILE_INTERNALS); + } +} + +/* Do the physical deletion of WINDOW, and forget this window and + associated nodes. */ +void +info_delete_window_internal (window) + WINDOW *window; +{ + if (windows->next && ((window->flags & W_WindowIsPerm) == 0)) + { + /* We not only delete the window from the display, we forget it from + our list of remembered windows. */ + forget_window_and_nodes (window); + window_delete_window (window); + + if (echo_area_is_active) + echo_area_inform_of_deleted_window (window); + } +} + +/* Just keep WINDOW, deleting all others. */ +DECLARE_INFO_COMMAND (info_keep_one_window, "Delete all other windows") +{ + int num_deleted; /* The number of windows we deleted. */ + int pagetop, start, end; + + /* Remember a few things about this window. We may be able to speed up + redisplay later by scrolling its contents. */ + pagetop = window->pagetop; + start = window->first_row; + end = start + window->height; + + num_deleted = 0; + + while (1) + { + WINDOW *win; + + /* Find an eligible window and delete it. If no eligible windows + are found, we are done. A window is eligible for deletion if + is it not permanent, and it is not WINDOW. */ + for (win = windows; win; win = win->next) + if (win != window && ((win->flags & W_WindowIsPerm) == 0)) + break; + + if (!win) + break; + + info_delete_window_internal (win); + num_deleted++; + } + + /* Scroll the contents of this window into the right place so that the + user doesn't have to wait any longer than necessary for redisplay. */ + if (num_deleted) + { + int amount; + + amount = (window->first_row - start); + amount -= (window->pagetop - pagetop); + display_scroll_display (start, end, amount); + } + + window->flags |= W_UpdateWindow; +} + +/* Scroll the "other" window of WINDOW. */ +DECLARE_INFO_COMMAND (info_scroll_other_window, "Scroll the other window") +{ + WINDOW *other; + + /* If only one window, give up. */ + if (!windows->next) + { + info_error (ONE_WINDOW); + return; + } + + other = window->next; + + if (!other) + other = window->prev; + + info_scroll_forward (other, count, key); +} + +/* Change the size of WINDOW by AMOUNT. */ +DECLARE_INFO_COMMAND (info_grow_window, "Grow (or shrink) this window") +{ + window_change_window_height (window, count); +} + +/* When non-zero, tiling takes place automatically when info_split_window + is called. */ +int auto_tiling_p = 0; + +/* Tile all of the visible windows. */ +DECLARE_INFO_COMMAND (info_tile_windows, + "Divide the available screen space among the visible windows") +{ + window_tile_windows (TILE_INTERNALS); +} + +/* Toggle the state of this window's wrapping of lines. */ +DECLARE_INFO_COMMAND (info_toggle_wrap, + "Toggle the state of line wrapping in the current window") +{ + window_toggle_wrap (window); +} + +/* **************************************************************** */ +/* */ +/* Info Node Commands */ +/* */ +/* **************************************************************** */ + +/* Using WINDOW for various defaults, select the node referenced by ENTRY + in it. If the node is selected, the window and node are remembered. */ +void +info_select_reference (window, entry) + WINDOW *window; + REFERENCE *entry; +{ + NODE *node; + char *filename, *nodename, *file_system_error; + + file_system_error = (char *)NULL; + + filename = entry->filename; + if (!filename) + filename = window->node->parent; + if (!filename) + filename = window->node->filename; + + if (filename) + filename = strdup (filename); + + if (entry->nodename) + nodename = strdup (entry->nodename); + else + nodename = strdup ("Top"); + + node = info_get_node (filename, nodename); + + /* Try something a little weird. If the node couldn't be found, and the + reference was of the form "foo::", see if the entry->label can be found + as a file, with a node of "Top". */ + if (!node) + { + if (info_recent_file_error) + file_system_error = strdup (info_recent_file_error); + + if (entry->nodename && (strcmp (entry->nodename, entry->label) == 0)) + { + node = info_get_node (entry->label, "Top"); + if (!node && info_recent_file_error) + { + maybe_free (file_system_error); + file_system_error = strdup (info_recent_file_error); + } + } + } + + if (!node) + { + if (file_system_error) + info_error (file_system_error); + else + info_error (CANT_FIND_NODE, nodename); + } + + maybe_free (file_system_error); + maybe_free (filename); + maybe_free (nodename); + + if (node) + { + set_remembered_pagetop_and_point (window); + info_set_node_of_window (window, node); + } +} + +/* Parse the node specification in LINE using WINDOW to default the filename. + Select the parsed node in WINDOW and remember it, or error if the node + couldn't be found. */ +static void +info_parse_and_select (line, window) + char *line; + WINDOW *window; +{ + REFERENCE entry; + + info_parse_node (line, DONT_SKIP_NEWLINES); + + entry.nodename = info_parsed_nodename; + entry.filename = info_parsed_filename; + entry.label = "*info-parse-and-select*"; + + info_select_reference (window, &entry); +} + +/* Given that the values of INFO_PARSED_FILENAME and INFO_PARSED_NODENAME + are previously filled, try to get the node represented by them into + WINDOW. The node should have been pointed to by the LABEL pointer of + WINDOW->node. */ +static void +info_handle_pointer (label, window) + char *label; + WINDOW *window; +{ + if (info_parsed_filename || info_parsed_nodename) + { + char *filename, *nodename; + NODE *node; + + filename = nodename = (char *)NULL; + + if (info_parsed_filename) + filename = strdup (info_parsed_filename); + else + { + if (window->node->parent) + filename = strdup (window->node->parent); + else if (window->node->filename) + filename = strdup (window->node->filename); + } + + if (info_parsed_nodename) + nodename = strdup (info_parsed_nodename); + else + nodename = strdup ("Top"); + + node = info_get_node (filename, nodename); + + if (node) + { + INFO_WINDOW *info_win; + + info_win = get_info_window_of_window (window); + if (info_win) + { + info_win->pagetops[info_win->current] = window->pagetop; + info_win->points[info_win->current] = window->point; + } + set_remembered_pagetop_and_point (window); + info_set_node_of_window (window, node); + } + else + { + if (info_recent_file_error) + info_error (info_recent_file_error); + else + info_error (CANT_FILE_NODE, filename, nodename); + } + + free (filename); + free (nodename); + } + else + { + info_error (NO_POINTER, label); + } +} + +/* Make WINDOW display the "Next:" node of the node currently being + displayed. */ +DECLARE_INFO_COMMAND (info_next_node, "Select the `Next' node") +{ + info_next_label_of_node (window->node); + info_handle_pointer ("Next", window); +} + +/* Make WINDOW display the "Prev:" node of the node currently being + displayed. */ +DECLARE_INFO_COMMAND (info_prev_node, "Select the `Prev' node") +{ + info_prev_label_of_node (window->node); + info_handle_pointer ("Prev", window); +} + +/* Make WINDOW display the "Up:" node of the node currently being + displayed. */ +DECLARE_INFO_COMMAND (info_up_node, "Select the `Up' node") +{ + info_up_label_of_node (window->node); + info_handle_pointer ("Up", window); +} + +/* Make WINDOW display the last node of this info file. */ +DECLARE_INFO_COMMAND (info_last_node, "Select the last node in this file") +{ + register int i; + FILE_BUFFER *fb = file_buffer_of_window (window); + NODE *node = (NODE *)NULL; + + if (fb && fb->tags) + { + for (i = 0; fb->tags[i]; i++); + node = info_get_node (fb->filename, fb->tags[i - 1]->nodename); + } + + if (!node) + info_error ("This window has no additional nodes"); + else + { + set_remembered_pagetop_and_point (window); + info_set_node_of_window (window, node); + } +} + +/* Make WINDOW display the first node of this info file. */ +DECLARE_INFO_COMMAND (info_first_node, "Select the first node in this file") +{ + FILE_BUFFER *fb = file_buffer_of_window (window); + NODE *node = (NODE *)NULL; + + if (fb && fb->tags) + node = info_get_node (fb->filename, fb->tags[0]->nodename); + + if (!node) + info_error ("This window has no additional nodes"); + else + { + set_remembered_pagetop_and_point (window); + info_set_node_of_window (window, node); + } +} + +/* Make WINDOW display the previous node displayed in this window. */ +DECLARE_INFO_COMMAND (info_history_node, + "Select the most recently selected node") +{ + INFO_WINDOW *info_win; + + /* Find the INFO_WINDOW which contains WINDOW. */ + info_win = get_info_window_of_window (window); + + if (!info_win) + { + info_error ("Requested window is not present!"); + return; + } + + set_remembered_pagetop_and_point (window); + if (!info_win->current) + { + if (info_win->nodes_index > 1) + { + window_message_in_echo_area + ("Now wrapped around to beginning of history."); + info_win->current = info_win->nodes_index; + } + else + { + info_error ("No earlier nodes in this window."); + return; + } + } + + info_win->current--; + window_set_node_of_window (window, info_win->nodes[info_win->current]); + window->pagetop = info_win->pagetops[info_win->current]; + window->point = info_win->points[info_win->current]; + window->flags |= W_UpdateWindow; + if (auto_footnotes_p) + info_get_or_remove_footnotes (window); +} + +/* Select the last menu item in WINDOW->node. */ +DECLARE_INFO_COMMAND (info_last_menu_item, + "Select the last item in this node's menu") +{ + info_menu_digit (window, 1, '0'); +} + +/* Use KEY (a digit) to select the Nth menu item in WINDOW->node. */ +DECLARE_INFO_COMMAND (info_menu_digit, "Select this menu item") +{ + register int i, item; + register REFERENCE *entry, **menu; + + menu = info_menu_of_node (window->node); + + if (!menu) + { + info_error (NO_MENU_NODE); + return; + } + + /* We have the menu. See if there are this many items in it. */ + item = key - '0'; + + /* Special case. Item "0" is the last item in this menu. */ + if (item == 0) + for (i = 0; menu[i + 1]; i++); + else + { + for (i = 0; entry = menu[i]; i++) + if (i == item - 1) + break; + } + + if (menu[i]) + info_select_reference (window, menu[i]); + else + info_error ("There aren't %d items in this menu.", item); + + info_free_references (menu); + return; +} + +/* Read a menu or followed reference from the user defaulting to the + reference found on the current line, and select that node. The + reading is done with completion. BUILDER is the function used + to build the list of references. ASK_P is non-zero if the user + should be prompted, or zero to select the default item. */ +static void +info_menu_or_ref_item (window, count, key, builder, ask_p) + WINDOW *window; + int count; + unsigned char key; + REFERENCE **(*builder) (); + int ask_p; +{ + REFERENCE **menu, *entry, *defentry = (REFERENCE *)NULL; + char *line; + + menu = (*builder) (window->node); + + if (!menu) + { + if (builder == info_menu_of_node) + info_error (NO_MENU_NODE); + else + info_error (NO_XREF_NODE); + return; + } + + /* Default the selected reference to the one which is on the line that + point is in. */ + { + REFERENCE **refs = (REFERENCE **)NULL; + int point_line; + + point_line = window_line_of_point (window); + + if (point_line != -1) + { + SEARCH_BINDING binding; + + binding.buffer = window->node->contents; + binding.start = window->line_starts[point_line] - binding.buffer; + if (window->line_starts[point_line + 1]) + binding.end = window->line_starts[point_line + 1] - binding.buffer; + else + binding.end = window->node->nodelen; + binding.flags = 0; + + if (builder == info_menu_of_node) + { + if (point_line) + { + binding.start--; + refs = info_menu_items (&binding); + } + } + else + { +#if defined (HANDLE_MAN_PAGES) + if (window->node->flags & N_IsManPage) + refs = manpage_xrefs_in_binding (window->node, &binding); + else +#endif /* HANDLE_MAN_PAGES */ + refs = info_xrefs (&binding); + } + + if (refs) + { + if ((strcmp (refs[0]->label, "Menu") != 0) || + (builder == info_xrefs_of_node)) + { + int which = 0; + + /* Find the closest reference to point. */ + if (builder == info_xrefs_of_node) + { + int closest = -1; + + for (; refs[which]; which++) + { + if ((window->point >= refs[which]->start) && + (window->point <= refs[which]->end)) + { + closest = which; + break; + } + else if (window->point < refs[which]->start) + { + break; + } + } + if (closest == -1) + which--; + else + which = closest; + } + + defentry = (REFERENCE *)xmalloc (sizeof (REFERENCE)); + defentry->label = strdup (refs[which]->label); + defentry->filename = refs[which]->filename; + defentry->nodename = refs[which]->nodename; + + if (defentry->filename) + defentry->filename = strdup (defentry->filename); + if (defentry->nodename) + defentry->nodename = strdup (defentry->nodename); + } + info_free_references (refs); + } + } + } + + /* If we are going to ask the user a question, do it now. */ + if (ask_p) + { + char *prompt; + + /* Build the prompt string. */ + if (defentry) + prompt = (char *)xmalloc (20 + strlen (defentry->label)); + else + prompt = (char *)xmalloc (20); + + if (builder == info_menu_of_node) + { + if (defentry) + sprintf (prompt, "Menu item (%s): ", defentry->label); + else + sprintf (prompt, "Menu item: "); + } + else + { + if (defentry) + sprintf (prompt, "Follow xref (%s): ", defentry->label); + else + sprintf (prompt, "Follow xref: "); + } + + line = info_read_completing_in_echo_area (window, prompt, menu); + free (prompt); + + window = active_window; + + /* User aborts, just quit. */ + if (!line) + { + maybe_free (defentry); + info_free_references (menu); + info_abort_key (window, 0, 0); + return; + } + + /* If we had a default and the user accepted it, use that. */ + if (!*line) + { + free (line); + if (defentry) + line = strdup (defentry->label); + else + line = (char *)NULL; + } + } + else + { + /* Not going to ask any questions. If we have a default entry, use + that, otherwise return. */ + if (!defentry) + return; + else + line = strdup (defentry->label); + } + + if (line) + { + /* Find the selected label in the references. */ + entry = info_get_labeled_reference (line, menu); + + if (!entry && defentry) + info_error ("The reference disappeared! (%s).", line); + else + { + NODE *orig; + + orig = window->node; + info_select_reference (window, entry); + if ((builder == info_xrefs_of_node) && (window->node != orig)) + { + long offset; + long start; + + if (window->line_count > 0) + start = window->line_starts[1] - window->node->contents; + else + start = 0; + + offset = + info_target_search_node (window->node, entry->label, start); + + if (offset != -1) + { + window->point = offset; + window_adjust_pagetop (window); + } + } + } + + free (line); + if (defentry) + { + free (defentry->label); + maybe_free (defentry->filename); + maybe_free (defentry->nodename); + free (defentry); + } + } + + info_free_references (menu); + + if (!info_error_was_printed) + window_clear_echo_area (); +} + +/* Read a line (with completion) which is the name of a menu item, + and select that item. */ +DECLARE_INFO_COMMAND (info_menu_item, "Read a menu item and select its node") +{ + info_menu_or_ref_item (window, count, key, info_menu_of_node, 1); +} + +/* Read a line (with completion) which is the name of a reference to + follow, and select the node. */ +DECLARE_INFO_COMMAND + (info_xref_item, "Read a footnote or cross reference and select its node") +{ + info_menu_or_ref_item (window, count, key, info_xrefs_of_node, 1); +} + +/* Position the cursor at the start of this node's menu. */ +DECLARE_INFO_COMMAND (info_find_menu, "Move to the start of this node's menu") +{ + SEARCH_BINDING binding; + long position; + + binding.buffer = window->node->contents; + binding.start = 0; + binding.end = window->node->nodelen; + binding.flags = S_FoldCase | S_SkipDest; + + position = search (INFO_MENU_LABEL, &binding); + + if (position == -1) + info_error (NO_MENU_NODE); + else + { + window->point = position; + window_adjust_pagetop (window); + window->flags |= W_UpdateWindow; + } +} + +/* Visit as many menu items as is possible, each in a separate window. */ +DECLARE_INFO_COMMAND (info_visit_menu, + "Visit as many menu items at once as possible") +{ + register int i; + REFERENCE *entry, **menu; + + menu = info_menu_of_node (window->node); + + if (!menu) + info_error (NO_MENU_NODE); + + for (i = 0; (!info_error_was_printed) && (entry = menu[i]); i++) + { + WINDOW *new; + + new = window_make_window (window->node); + window_tile_windows (TILE_INTERNALS); + + if (!new) + info_error (WIN_TOO_SMALL); + else + { + active_window = new; + info_select_reference (new, entry); + } + } +} + +/* Read a line of input which is a node name, and go to that node. */ +DECLARE_INFO_COMMAND (info_goto_node, "Read a node name and select it") +{ + char *line; + NODE *node; + +#define GOTO_COMPLETES +#if defined (GOTO_COMPLETES) + /* Build a completion list of all of the known nodes. */ + { + register int fbi, i; + FILE_BUFFER *current; + REFERENCE **items = (REFERENCE **)NULL; + int items_index = 0; + int items_slots = 0; + + current = file_buffer_of_window (window); + + for (fbi = 0; info_loaded_files && info_loaded_files[fbi]; fbi++) + { + FILE_BUFFER *fb; + REFERENCE *entry; + int this_is_the_current_fb; + + fb = info_loaded_files[fbi]; + this_is_the_current_fb = (current == fb); + + entry = (REFERENCE *)xmalloc (sizeof (REFERENCE)); + entry->filename = entry->nodename = (char *)NULL; + entry->label = (char *)xmalloc (4 + strlen (fb->filename)); + sprintf (entry->label, "(%s)*", fb->filename); + + add_pointer_to_array + (entry, items_index, items, items_slots, 10, REFERENCE *); + + if (fb->tags) + { + for (i = 0; fb->tags[i]; i++) + { + entry = (REFERENCE *)xmalloc (sizeof (REFERENCE)); + entry->filename = entry->nodename = (char *)NULL; + entry->label = (char *) xmalloc + (4 + strlen (fb->filename) + strlen (fb->tags[i]->nodename)); + sprintf (entry->label, "(%s)%s", + fb->filename, fb->tags[i]->nodename); + + add_pointer_to_array + (entry, items_index, items, items_slots, 100, REFERENCE *); + } + + if (this_is_the_current_fb) + { + for (i = 0; fb->tags[i]; i++) + { + entry = (REFERENCE *)xmalloc (sizeof (REFERENCE)); + entry->filename = entry->nodename = (char *)NULL; + entry->label = strdup (fb->tags[i]->nodename); + add_pointer_to_array (entry, items_index, items, + items_slots, 100, REFERENCE *); + } + } + } + } + line = info_read_maybe_completing (window, "Goto Node: ", items); + info_free_references (items); + } +#else /* !GOTO_COMPLETES */ + line = info_read_in_echo_area (window, "Goto Node: "); +#endif /* !GOTO_COMPLETES */ + + /* If the user aborted, quit now. */ + if (!line) + { + info_abort_key (window, 0, 0); + return; + } + + canonicalize_whitespace (line); + + if (*line) + info_parse_and_select (line, window); + + free (line); + if (!info_error_was_printed) + window_clear_echo_area (); +} + +#if defined (HANDLE_MAN_PAGES) +DECLARE_INFO_COMMAND (info_man, "Read a manpage reference and select it") +{ + char *line; + NODE *node; + + line = info_read_in_echo_area (window, "Get Manpage: "); + + if (!line) + { + info_abort_key (window, 0, 0); + return; + } + + canonicalize_whitespace (line); + + if (*line) + { + char *goto_command; + + goto_command = (char *)xmalloc + (4 + strlen (MANPAGE_FILE_BUFFER_NAME) + strlen (line)); + + sprintf (goto_command, "(%s)%s", MANPAGE_FILE_BUFFER_NAME, line); + + info_parse_and_select (goto_command, window); + free (goto_command); + } + + free (line); + if (!info_error_was_printed) + window_clear_echo_area (); +} +#endif /* HANDLE_MAN_PAGES */ + +/* Move to the "Top" node in this file. */ +DECLARE_INFO_COMMAND (info_top_node, "Select the node `Top' in this file") +{ + info_parse_and_select ("Top", window); +} + +/* Move to the node "(dir)Top". */ +DECLARE_INFO_COMMAND (info_dir_node, "Select the node `(dir)'") +{ + info_parse_and_select ("(dir)Top", window); +} + +/* Try to delete the current node appearing in this window, showing the most + recently selected node in this window. */ +DECLARE_INFO_COMMAND (info_kill_node, "Kill this node") +{ + register int iw, i; + register INFO_WINDOW *info_win; + char *nodename = (char *)NULL; + NODE *temp = (NODE *)NULL; + + /* Read the name of a node to kill. The list of available nodes comes + from the nodes appearing in the current window configuration. */ + { + REFERENCE **menu = (REFERENCE **)NULL; + int menu_index = 0, menu_slots = 0; + char *default_nodename, *prompt; + + for (iw = 0; info_win = info_windows[iw]; iw++) + { + REFERENCE *entry; + + entry = (REFERENCE *)xmalloc (sizeof (REFERENCE)); + entry->label = strdup (info_win->window->node->nodename); + entry->filename = entry->nodename = (char *)NULL; + + add_pointer_to_array + (entry, menu_index, menu, menu_slots, 10, REFERENCE *); + } + + default_nodename = strdup (active_window->node->nodename); + prompt = (char *)xmalloc (40 + strlen (default_nodename)); + sprintf (prompt, "Kill node (%s): ", default_nodename); + + nodename = info_read_completing_in_echo_area (window, prompt, menu); + free (prompt); + info_free_references (menu); + if (nodename && !*nodename) + { + free (nodename); + nodename = default_nodename; + } + else + free (default_nodename); + } + + /* If there is no nodename to kill, quit now. */ + if (!nodename) + { + info_abort_key (window, 0, 0); + return; + } + + /* If there is a nodename, find it in our window list. */ + for (iw = 0; info_win = info_windows[iw]; iw++) + if (strcmp (nodename, info_win->nodes[info_win->current]->nodename) == 0) + break; + + if (!info_win) + { + if (*nodename) + info_error ("Cannot kill the node `%s'", nodename); + else + window_clear_echo_area (); + + return; + } + + /* If there are no more nodes left anywhere to view, complain and exit. */ + if (info_windows_index == 1 && info_windows[0]->nodes_index == 1) + { + info_error ("Cannot kill the last node"); + return; + } + + /* INFO_WIN contains the node that the user wants to stop viewing. + Delete this node from the list of nodes previously shown in this + window. */ + for (i = info_win->current; i < info_win->nodes_index; i++) + info_win->nodes[i] = info_win->nodes[i++]; + + /* There is one less node in this window's history list. */ + info_win->nodes_index--; + + /* Make this window show the most recent history node. */ + info_win->current = info_win->nodes_index - 1; + + /* If there aren't any nodes left in this window, steal one from the + next window. */ + if (info_win->current < 0) + { + INFO_WINDOW *stealer; + int which, pagetop; + long point; + + if (info_windows[iw + 1]) + stealer = info_windows[iw + 1]; + else + stealer = info_windows[0]; + + /* If the node being displayed in the next window is not the most + recently loaded one, get the most recently loaded one. */ + if ((stealer->nodes_index - 1) != stealer->current) + which = stealer->nodes_index - 1; + + /* Else, if there is another node behind the stealers current node, + use that one. */ + else if (stealer->current > 0) + which = stealer->current - 1; + + /* Else, just use the node appearing in STEALER's window. */ + else + which = stealer->current; + + /* Copy this node. */ + { + NODE *copy; + + temp = stealer->nodes[which]; + point = stealer->points[which]; + pagetop = stealer->pagetops[which]; + + copy = (NODE *)xmalloc (sizeof (NODE)); + copy->filename = temp->filename; + copy->parent = temp->parent; + copy->nodename = temp->nodename; + copy->contents = temp->contents; + copy->nodelen = temp->nodelen; + copy->flags = temp->flags; + + temp = copy; + } + + window_set_node_of_window (info_win->window, temp); + window->point = point; + window->pagetop = pagetop; + remember_window_and_node (info_win->window, temp); + } + else + { + temp = info_win->nodes[info_win->current]; + window_set_node_of_window (info_win->window, temp); + } + if (!info_error_was_printed) + window_clear_echo_area (); +} + +/* Read the name of a file and select the entire file. */ +DECLARE_INFO_COMMAND (info_view_file, "Read the name of a file and select it") +{ + char *line; + + line = info_read_in_echo_area (window, "Find file: "); + if (!line) + { + info_abort_key (active_window, 1, 0); + return; + } + + if (*line) + { + NODE *node; + + node = info_get_node (line, "*"); + if (!node) + { + if (info_recent_file_error) + info_error (info_recent_file_error); + else + info_error ("Cannot find \"%s\".", line); + } + else + { + set_remembered_pagetop_and_point (active_window); + info_set_node_of_window (window, node); + } + free (line); + } + + if (!info_error_was_printed) + window_clear_echo_area (); +} + +/* **************************************************************** */ +/* */ +/* Dumping and Printing Nodes */ +/* */ +/* **************************************************************** */ + +#define VERBOSE_NODE_DUMPING +static void write_node_to_stream (); +static void dump_node_to_stream (); +static void initialize_dumping (); + +/* Dump the nodes specified by FILENAME and NODENAMES to the file named + in OUTPUT_FILENAME. If DUMP_SUBNODES is non-zero, recursively dump + the nodes which appear in the menu of each node dumped. */ +void +dump_nodes_to_file (filename, nodenames, output_filename, dump_subnodes) + char *filename; + char **nodenames; + char *output_filename; + int dump_subnodes; +{ + register int i; + FILE *output_stream; + + /* Get the stream to print the nodes to. Special case of an output + filename of "-" means to dump the nodes to stdout. */ + if (strcmp (output_filename, "-") == 0) + output_stream = stdout; + else + output_stream = fopen (output_filename, "w"); + + if (!output_stream) + { + info_error ("Could not create output file \"%s\".", output_filename); + return; + } + + /* Print each node to stream. */ + initialize_dumping (); + for (i = 0; nodenames[i]; i++) + dump_node_to_stream (filename, nodenames[i], output_stream, dump_subnodes); + + if (output_stream != stdout) + fclose (output_stream); + +#if defined (VERBOSE_NODE_DUMPING) + info_error ("Done."); +#endif /* VERBOSE_NODE_DUMPING */ +} + +/* A place to remember already dumped nodes. */ +static char **dumped_already = (char **)NULL; +static int dumped_already_index = 0; +static int dumped_already_slots = 0; + +static void +initialize_dumping () +{ + dumped_already_index = 0; +} + +/* Get and print the node specified by FILENAME and NODENAME to STREAM. + If DUMP_SUBNODES is non-zero, recursively dump the nodes which appear + in the menu of each node dumped. */ +static void +dump_node_to_stream (filename, nodename, stream, dump_subnodes) + char *filename, *nodename; + FILE *stream; + int dump_subnodes; +{ + register int i; + NODE *node; + + node = info_get_node (filename, nodename); + + if (!node) + { + if (info_recent_file_error) + info_error (info_recent_file_error); + else + { + if (filename && *nodename != '(') + info_error + (CANT_FILE_NODE, filename_non_directory (filename), nodename); + else + info_error (CANT_FIND_NODE, nodename); + } + return; + } + + /* If we have already dumped this node, don't dump it again. */ + for (i = 0; i < dumped_already_index; i++) + if (strcmp (node->nodename, dumped_already[i]) == 0) + { + free (node); + return; + } + add_pointer_to_array (node->nodename, dumped_already_index, dumped_already, + dumped_already_slots, 50, char *); + +#if defined (VERBOSE_NODE_DUMPING) + /* Maybe we should print some information about the node being output. */ + if (node->filename) + info_error ("Writing node \"(%s)%s\"...", + filename_non_directory (node->filename), node->nodename); + else + info_error ("Writing node \"%s\"...", node->nodename); +#endif /* VERBOSE_NODE_DUMPING */ + + write_node_to_stream (node, stream); + + /* If we are dumping subnodes, get the list of menu items in this node, + and dump each one recursively. */ + if (dump_subnodes) + { + REFERENCE **menu = (REFERENCE **)NULL; + + /* If this node is an Index, do not dump the menu references. */ + if (string_in_line ("Index", node->nodename) == -1) + menu = info_menu_of_node (node); + + if (menu) + { + for (i = 0; menu[i]; i++) + { + /* We don't dump Info files which are different than the + current one. */ + if (!menu[i]->filename) + dump_node_to_stream + (filename, menu[i]->nodename, stream, dump_subnodes); + } + info_free_references (menu); + } + } + + free (node); +} + +/* Dump NODE to FILENAME. If DUMP_SUBNODES is non-zero, recursively dump + the nodes which appear in the menu of each node dumped. */ +void +dump_node_to_file (node, filename, dump_subnodes) + NODE *node; + char *filename; + int dump_subnodes; +{ + FILE *output_stream; + char *nodes_filename; + + /* Get the stream to print this node to. Special case of an output + filename of "-" means to dump the nodes to stdout. */ + if (strcmp (filename, "-") == 0) + output_stream = stdout; + else + output_stream = fopen (filename, "w"); + + if (!output_stream) + { + info_error ("Could not create output file \"%s\".", filename); + return; + } + + if (node->parent) + nodes_filename = node->parent; + else + nodes_filename = node->filename; + + initialize_dumping (); + dump_node_to_stream + (nodes_filename, node->nodename, output_stream, dump_subnodes); + + if (output_stream != stdout) + fclose (output_stream); + +#if defined (VERBOSE_NODE_DUMPING) + info_error ("Done."); +#endif /* VERBOSE_NODE_DUMPING */ +} + +#if !defined (DEFAULT_INFO_PRINT_COMMAND) +# define DEFAULT_INFO_PRINT_COMMAND "lpr" +#endif /* !DEFAULT_INFO_PRINT_COMMAND */ + +DECLARE_INFO_COMMAND (info_print_node, + "Pipe the contents of this node through INFO_PRINT_COMMAND") +{ + print_node (window->node); +} + +/* Print NODE on a printer piping it into INFO_PRINT_COMMAND. */ +void +print_node (node) + NODE *node; +{ + char *print_command, *getenv (); + FILE *printer_pipe; + + print_command = getenv ("INFO_PRINT_COMMAND"); + + if (!print_command || !*print_command) + print_command = DEFAULT_INFO_PRINT_COMMAND; + + printer_pipe = popen (print_command, "w"); + + if (!printer_pipe) + { + info_error ("Cannot open pipe to \"%s\".", print_command); + return; + } + +#if defined (VERBOSE_NODE_DUMPING) + /* Maybe we should print some information about the node being output. */ + if (node->filename) + info_error ("Printing node \"(%s)%s\"...", + filename_non_directory (node->filename), node->nodename); + else + info_error ("Printing node \"%s\"...", node->nodename); +#endif /* VERBOSE_NODE_DUMPING */ + + write_node_to_stream (node, printer_pipe); + pclose (printer_pipe); + +#if defined (VERBOSE_NODE_DUMPING) + info_error ("Done."); +#endif /* VERBOSE_NODE_DUMPING */ +} + +static void +write_node_to_stream (node, stream) + NODE *node; + FILE *stream; +{ + fwrite (node->contents, 1, node->nodelen, stream); +} + +/* **************************************************************** */ +/* */ +/* Info Searching Commands */ +/* */ +/* **************************************************************** */ + +/* Variable controlling the garbage collection of files briefly visited + during searches. Such files are normally gc'ed, unless they were + compressed to begin with. If this variable is non-zero, it says + to gc even those file buffer contents which had to be uncompressed. */ +int gc_compressed_files = 0; + +static void info_gc_file_buffers (); + +static char *search_string = (char *)NULL; +static int search_string_index = 0; +static int search_string_size = 0; +static int isearch_is_active = 0; + +/* Return the file buffer which belongs to WINDOW's node. */ +FILE_BUFFER * +file_buffer_of_window (window) + WINDOW *window; +{ + /* If this window has no node, then it has no file buffer. */ + if (!window->node) + return ((FILE_BUFFER *)NULL); + + if (window->node->parent) + return (info_find_file (window->node->parent)); + + if (window->node->filename) + return (info_find_file (window->node->filename)); + + return ((FILE_BUFFER *)NULL); +} + +/* Search for STRING in NODE starting at START. Return -1 if the string + was not found, or the location of the string if it was. If WINDOW is + passed as non-null, set the window's node to be NODE, its point to be + the found string, and readjust the window's pagetop. Final argument + DIR says which direction to search in. If it is positive, search + forward, else backwards. */ +long +info_search_in_node (string, node, start, window, dir) + char *string; + NODE *node; + long start; + WINDOW *window; + int dir; +{ + SEARCH_BINDING binding; + long offset; + + binding.buffer = node->contents; + binding.start = start; + binding.end = node->nodelen; + binding.flags = S_FoldCase; + + if (dir < 0) + { + binding.end = 0; + binding.flags |= S_SkipDest; + } + + if (binding.start < 0) + return (-1); + + /* For incremental searches, we always wish to skip past the string. */ + if (isearch_is_active) + binding.flags |= S_SkipDest; + + offset = search (string, &binding); + + if (offset != -1 && window) + { + set_remembered_pagetop_and_point (window); + if (window->node != node) + window_set_node_of_window (window, node); + window->point = offset; + window_adjust_pagetop (window); + } + return (offset); +} + +/* Search NODE, looking for the largest possible match of STRING. Start the + search at START. Return the absolute position of the match, or -1, if + no part of the string could be found. */ +long +info_target_search_node (node, string, start) + NODE *node; + char *string; + long start; +{ + register int i; + long offset; + char *target; + + target = strdup (string); + i = strlen (target); + + /* Try repeatedly searching for this string while removing words from + the end of it. */ + while (i) + { + target[i] = '\0'; + offset = info_search_in_node (target, node, start, (WINDOW *)NULL, 1); + + if (offset != -1) + break; + + /* Delete the last word from TARGET. */ + for (; i && (!whitespace (target[i]) && (target[i] != ',')); i--); + } + free (target); + return (offset); +} + +/* Search for STRING starting in WINDOW at point. If the string is found + in this node, set point to that position. Otherwise, get the file buffer + associated with WINDOW's node, and search through each node in that file. + If the search fails, return non-zero, else zero. Side-effect window + leaving the node and point where the string was found current. */ +static char *last_searched_for_string = (char *)NULL; +static int +info_search_internal (string, window, dir) + char *string; + WINDOW *window; + int dir; +{ + register int i; + FILE_BUFFER *file_buffer; + char *initial_nodename; + long ret, start = 0; + + file_buffer = file_buffer_of_window (window); + initial_nodename = window->node->nodename; + + if ((info_last_executed_command == info_search) && + (last_searched_for_string) && + (strcmp (last_searched_for_string, string) == 0)) + { + ret = info_search_in_node + (string, window->node, window->point + dir, window, dir); + } + else + { + ret = info_search_in_node + (string, window->node, window->point, window, dir); + } + + maybe_free (last_searched_for_string); + last_searched_for_string = strdup (string); + + if (ret != -1) + { + /* We won! */ + if (!echo_area_is_active && !isearch_is_active) + window_clear_echo_area (); + return (0); + } + + /* The string wasn't found in the current node. Search through the + window's file buffer, iff the current node is not "*". */ + if (!file_buffer || (strcmp (initial_nodename, "*") == 0)) + return (-1); + + /* If this file has tags, search through every subfile, starting at + this node's subfile and node. Otherwise, search through the + file's node list. */ + if (file_buffer->tags) + { + register int current_tag, number_of_tags; + char *last_subfile; + TAG *tag; + + /* Find number of tags and current tag. */ + last_subfile = (char *)NULL; + for (i = 0; file_buffer->tags[i]; i++) + if (strcmp (initial_nodename, file_buffer->tags[i]->nodename) == 0) + { + current_tag = i; + last_subfile = file_buffer->tags[i]->filename; + } + + number_of_tags = i; + + /* If there is no last_subfile, our tag wasn't found. */ + if (!last_subfile) + return (-1); + + /* Search through subsequent nodes, wrapping around to the top + of the info file until we find the string or return to this + window's node and point. */ + while (1) + { + NODE *node; + + /* Allow C-g to quit the search, failing it if pressed. */ + return_if_control_g (-1); + + current_tag += dir; + + if (current_tag < 0) + current_tag = number_of_tags - 1; + else if (current_tag == number_of_tags) + current_tag = 0; + + tag = file_buffer->tags[current_tag]; + + if (!echo_area_is_active && (last_subfile != tag->filename)) + { + window_message_in_echo_area + ("Searching subfile \"%s\"...", + filename_non_directory (tag->filename)); + + last_subfile = tag->filename; + } + + node = info_get_node (file_buffer->filename, tag->nodename); + + if (!node) + { + /* If not doing i-search... */ + if (!echo_area_is_active) + { + if (info_recent_file_error) + info_error (info_recent_file_error); + else + info_error (CANT_FILE_NODE, + filename_non_directory (file_buffer->filename), + tag->nodename); + } + return (-1); + } + + if (dir < 0) + start = tag->nodelen; + + ret = + info_search_in_node (string, node, start, window, dir); + + /* Did we find the string in this node? */ + if (ret != -1) + { + /* Yes! We win. */ + remember_window_and_node (window, node); + if (!echo_area_is_active) + window_clear_echo_area (); + return (0); + } + + /* No. Free this node, and make sure that we haven't passed + our starting point. */ + free (node); + + if (strcmp (initial_nodename, tag->nodename) == 0) + return (-1); + } + } + return (-1); +} + +DECLARE_INFO_COMMAND (info_search, "Read a string and search for it") +{ + char *line, *prompt; + int result, old_pagetop; + int direction; + + if (count < 0) + direction = -1; + else + direction = 1; + + /* Read a string from the user, defaulting the search to SEARCH_STRING. */ + if (!search_string) + { + search_string = (char *)xmalloc (search_string_size = 100); + search_string[0] = '\0'; + } + + prompt = (char *)xmalloc (50 + strlen (search_string)); + + sprintf (prompt, "%s for string [%s]: ", + direction < 0 ? "Search backward" : "Search", + search_string); + + line = info_read_in_echo_area (window, prompt); + free (prompt); + + if (!line) + { + info_abort_key (); + return; + } + + if (*line) + { + if (strlen (line) + 1 > search_string_size) + search_string = (char *) + xrealloc (search_string, (search_string_size += 50 + strlen (line))); + + strcpy (search_string, line); + search_string_index = strlen (line); + free (line); + } + + old_pagetop = active_window->pagetop; + result = info_search_internal (search_string, active_window, direction); + + if (result != 0 && !info_error_was_printed) + info_error ("Search failed."); + else if (old_pagetop != active_window->pagetop) + { + int new_pagetop; + + new_pagetop = active_window->pagetop; + active_window->pagetop = old_pagetop; + set_window_pagetop (active_window, new_pagetop); + if (auto_footnotes_p) + info_get_or_remove_footnotes (active_window); + } + + /* Perhaps free the unreferenced file buffers that were searched, but + not retained. */ + info_gc_file_buffers (); +} + +/* **************************************************************** */ +/* */ +/* Incremental Searching */ +/* */ +/* **************************************************************** */ + +static void incremental_search (); + +DECLARE_INFO_COMMAND (isearch_forward, + "Search interactively for a string as you type it") +{ + incremental_search (window, count, key); +} + +DECLARE_INFO_COMMAND (isearch_backward, + "Search interactively for a string as you type it") +{ + incremental_search (window, -count, key); +} + +/* Incrementally search for a string as it is typed. */ +/* The last accepted incremental search string. */ +static char *last_isearch_accepted = (char *)NULL; + +/* The current incremental search string. */ +static char *isearch_string = (char *)NULL; +static int isearch_string_index = 0; +static int isearch_string_size = 0; +static unsigned char isearch_terminate_search_key = ESC; + +/* Structure defining the current state of an incremental search. */ +typedef struct { + WINDOW_STATE_DECL; /* The node, pagetop and point. */ + int search_index; /* Offset of the last char in the search string. */ + int direction; /* The direction that this search is heading in. */ + int failing; /* Whether or not this search failed. */ +} SEARCH_STATE; + +/* Array of search states. */ +static SEARCH_STATE **isearch_states = (SEARCH_STATE **)NULL; +static int isearch_states_index = 0; +static int isearch_states_slots = 0; + +/* Push the state of this search. */ +static void +push_isearch (window, search_index, direction, failing) + WINDOW *window; + int search_index, direction, failing; +{ + SEARCH_STATE *state; + + state = (SEARCH_STATE *)xmalloc (sizeof (SEARCH_STATE)); + window_get_state (window, state); + state->search_index = search_index; + state->direction = direction; + state->failing = failing; + + add_pointer_to_array (state, isearch_states_index, isearch_states, + isearch_states_slots, 20, SEARCH_STATE *); +} + +/* Pop the state of this search to WINDOW, SEARCH_INDEX, and DIRECTION. */ +static void +pop_isearch (window, search_index, direction, failing) + WINDOW *window; + int *search_index, *direction, *failing; +{ + SEARCH_STATE *state; + + if (isearch_states_index) + { + isearch_states_index--; + state = isearch_states[isearch_states_index]; + window_set_state (window, state); + *search_index = state->search_index; + *direction = state->direction; + *failing = state->failing; + + free (state); + isearch_states[isearch_states_index] = (SEARCH_STATE *)NULL; + } +} + +/* Free the memory used by isearch_states. */ +static void +free_isearch_states () +{ + register int i; + + for (i = 0; i < isearch_states_index; i++) + { + free (isearch_states[i]); + isearch_states[i] = (SEARCH_STATE *)NULL; + } + isearch_states_index = 0; +} + +/* Display the current search in the echo area. */ +static void +show_isearch_prompt (dir, string, failing_p) + int dir; + unsigned char *string; + int failing_p; +{ + register int i; + char *prefix, *prompt, *p_rep; + int prompt_len, p_rep_index, p_rep_size; + + if (dir < 0) + prefix = "I-search backward: "; + else + prefix = "I-search: "; + + p_rep_index = p_rep_size = 0; + p_rep = (char *)NULL; + for (i = 0; string[i]; i++) + { + char *rep; + + switch (string[i]) + { + case ' ': rep = " "; break; + case LFD: rep = "\\n"; break; + case TAB: rep = "\\t"; break; + default: + rep = pretty_keyname (string[i]); + } + if ((p_rep_index + strlen (rep) + 1) >= p_rep_size) + p_rep = (char *)xrealloc (p_rep, p_rep_size += 100); + + strcpy (p_rep + p_rep_index, rep); + p_rep_index += strlen (rep); + } + + prompt_len = strlen (prefix) + p_rep_index + 20; + prompt = (char *)xmalloc (prompt_len); + sprintf (prompt, "%s%s%s", failing_p ? "Failing " : "", prefix, + p_rep ? p_rep : ""); + + window_message_in_echo_area ("%s", prompt); + maybe_free (p_rep); + free (prompt); + display_cursor_at_point (active_window); +} + +static void +incremental_search (window, count, ignore) + WINDOW *window; + int count; + unsigned char ignore; +{ + unsigned char key; + int last_search_result, search_result, dir; + SEARCH_STATE mystate, orig_state; + + if (count < 0) + dir = -1; + else + dir = 1; + + last_search_result = search_result = 0; + + window_get_state (window, &orig_state); + + isearch_string_index = 0; + if (!isearch_string_size) + isearch_string = (char *)xmalloc (isearch_string_size = 50); + + /* Show the search string in the echo area. */ + isearch_string[isearch_string_index] = '\0'; + show_isearch_prompt (dir, isearch_string, search_result); + + isearch_is_active = 1; + + while (isearch_is_active) + { + VFunction *func = (VFunction *)NULL; + int quoted = 0; + + /* If a recent display was interrupted, then do the redisplay now if + it is convenient. */ + if (!info_any_buffered_input_p () && display_was_interrupted_p) + { + display_update_one_window (window); + display_cursor_at_point (active_window); + } + + /* Read a character and dispatch on it. */ + key = info_get_input_char (); + window_get_state (window, &mystate); + + if (key == DEL) + { + /* User wants to delete one level of search? */ + if (!isearch_states_index) + { + terminal_ring_bell (); + continue; + } + else + { + pop_isearch + (window, &isearch_string_index, &dir, &search_result); + isearch_string[isearch_string_index] = '\0'; + show_isearch_prompt (dir, isearch_string, search_result); + goto after_search; + } + } + else if (key == Control ('q')) + { + key = info_get_input_char (); + quoted = 1; + } + + /* We are about to search again, or quit. Save the current search. */ + push_isearch (window, isearch_string_index, dir, search_result); + + if (quoted) + goto insert_and_search; + + if (!Meta_p (key) || (ISO_Latin_p && key < 160)) + { + func = window->keymap[key].function; + + /* If this key invokes an incremental search, then this means that + we will either search again in the same direction, search + again in the reverse direction, or insert the last search + string that was accepted through incremental searching. */ + if (func == isearch_forward || func == isearch_backward) + { + if ((func == isearch_forward && dir > 0) || + (func == isearch_backward && dir < 0)) + { + /* If the user has typed no characters, then insert the + last successful search into the current search string. */ + if (isearch_string_index == 0) + { + /* Of course, there must be something to insert. */ + if (last_isearch_accepted) + { + if (strlen (last_isearch_accepted) + 1 >= + isearch_string_size) + isearch_string = (char *) + xrealloc (isearch_string, + isearch_string_size += 10 + + strlen (last_isearch_accepted)); + strcpy (isearch_string, last_isearch_accepted); + isearch_string_index = strlen (isearch_string); + goto search_now; + } + else + continue; + } + else + { + /* Search again in the same direction. This means start + from a new place if the last search was successful. */ + if (search_result == 0) + window->point += dir; + } + } + else + { + /* Reverse the direction of the search. */ + dir = -dir; + } + } + else if (isprint (key) || func == (VFunction *)NULL) + { + insert_and_search: + + if (isearch_string_index + 2 >= isearch_string_size) + isearch_string = (char *)xrealloc + (isearch_string, isearch_string_size += 100); + + isearch_string[isearch_string_index++] = key; + isearch_string[isearch_string_index] = '\0'; + goto search_now; + } + else if (func == info_abort_key) + { + /* If C-g pressed, and the search is failing, pop the search + stack back to the last unfailed search. */ + if (isearch_states_index && (search_result != 0)) + { + terminal_ring_bell (); + while (isearch_states_index && (search_result != 0)) + pop_isearch + (window, &isearch_string_index, &dir, &search_result); + isearch_string[isearch_string_index] = '\0'; + show_isearch_prompt (dir, isearch_string, search_result); + continue; + } + else + goto exit_search; + } + else + goto exit_search; + } + else + { + exit_search: + /* The character is not printable, or it has a function which is + non-null. Exit the search, remembering the search string. If + the key is not the same as the isearch_terminate_search_key, + then push it into pending input. */ + if (isearch_string_index && func != info_abort_key) + { + maybe_free (last_isearch_accepted); + last_isearch_accepted = strdup (isearch_string); + } + + if (key != isearch_terminate_search_key) + info_set_pending_input (key); + + if (func == info_abort_key) + { + if (isearch_states_index) + window_set_state (window, &orig_state); + } + + if (!echo_area_is_active) + window_clear_echo_area (); + + if (auto_footnotes_p) + info_get_or_remove_footnotes (active_window); + + isearch_is_active = 0; + continue; + } + + /* Search for the contents of isearch_string. */ + search_now: + show_isearch_prompt (dir, isearch_string, search_result); + + if (search_result == 0) + { + /* Check to see if the current search string is right here. If + we are looking at it, then don't bother calling the search + function. */ + if (((dir < 0) && + (strncasecmp (window->node->contents + window->point, + isearch_string, isearch_string_index) == 0)) || + ((dir > 0) && + ((window->point - isearch_string_index) >= 0) && + (strncasecmp (window->node->contents + + (window->point - (isearch_string_index - 1)), + isearch_string, isearch_string_index) == 0))) + { + if (dir > 0) + window->point++; + } + else + search_result = info_search_internal (isearch_string, window, dir); + } + + /* If this search failed, and we didn't already have a failed search, + then ring the terminal bell. */ + if (search_result != 0 && last_search_result == 0) + terminal_ring_bell (); + + after_search: + show_isearch_prompt (dir, isearch_string, search_result); + + if (search_result == 0) + { + if ((mystate.node == window->node) && + (mystate.pagetop != window->pagetop)) + { + int newtop = window->pagetop; + window->pagetop = mystate.pagetop; + set_window_pagetop (window, newtop); + } + display_update_one_window (window); + display_cursor_at_point (window); + } + + last_search_result = search_result; + } + + /* Free the memory used to remember each search state. */ + free_isearch_states (); + + /* Perhaps GC some file buffers. */ + info_gc_file_buffers (); + + /* After searching, leave the window in the correct state. */ + if (!echo_area_is_active) + window_clear_echo_area (); +} + +/* GC some file buffers. A file buffer can be gc-ed if there we have + no nodes in INFO_WINDOWS that reference this file buffer's contents. + Garbage collecting a file buffer means to free the file buffers + contents. */ +static void +info_gc_file_buffers () +{ + register int fb_index, iw_index, i; + register FILE_BUFFER *fb; + register INFO_WINDOW *iw; + + if (!info_loaded_files) + return; + + for (fb_index = 0; fb = info_loaded_files[fb_index]; fb_index++) + { + int fb_referenced_p = 0; + + /* If already gc-ed, do nothing. */ + if (!fb->contents) + continue; + + /* If this file had to be uncompressed, check to see if we should + gc it. This means that the user-variable "gc-compressed-files" + is non-zero. */ + if ((fb->flags & N_IsCompressed) && !gc_compressed_files) + continue; + + /* If this file's contents are not gc-able, move on. */ + if (fb->flags & N_CannotGC) + continue; + + /* Check each INFO_WINDOW to see if it has any nodes which reference + this file. */ + for (iw_index = 0; iw = info_windows[iw_index]; iw_index++) + { + for (i = 0; iw->nodes && iw->nodes[i]; i++) + { + if ((strcmp (fb->fullpath, iw->nodes[i]->filename) == 0) || + (strcmp (fb->filename, iw->nodes[i]->filename) == 0)) + { + fb_referenced_p = 1; + break; + } + } + } + + /* If this file buffer wasn't referenced, free its contents. */ + if (!fb_referenced_p) + { + free (fb->contents); + fb->contents = (char *)NULL; + } + } +} + +/* **************************************************************** */ +/* */ +/* Traversing and Selecting References */ +/* */ +/* **************************************************************** */ + +/* Move to the next or previous cross reference in this node. */ +static void +info_move_to_xref (window, count, key, dir) + WINDOW *window; + int count; + unsigned char key; + int dir; +{ + long firstmenu, firstxref; + long nextmenu, nextxref; + long placement = -1; + long start = 0; + NODE *node = window->node; + + if (dir < 0) + start = node->nodelen; + + /* This search is only allowed to fail if there is no menu or cross + reference in the current node. Otherwise, the first menu or xref + found is moved to. */ + + firstmenu = info_search_in_node + (INFO_MENU_ENTRY_LABEL, node, start, (WINDOW *)NULL, dir); + + /* FIRSTMENU may point directly to the line defining the menu. Skip that + and go directly to the first item. */ + + if (firstmenu != -1) + { + char *text = node->contents + firstmenu; + + if (strncmp (text, INFO_MENU_LABEL, strlen (INFO_MENU_LABEL)) == 0) + firstmenu = info_search_in_node + (INFO_MENU_ENTRY_LABEL, node, firstmenu + dir, (WINDOW *)NULL, dir); + } + + firstxref = + info_search_in_node (INFO_XREF_LABEL, node, start, (WINDOW *)NULL, dir); + +#if defined (HANDLE_MAN_PAGES) + if ((firstxref == -1) && (node->flags & N_IsManPage)) + { + firstxref = locate_manpage_xref (node, start, dir); + } +#endif /* HANDLE_MAN_PAGES */ + + if (firstmenu == -1 && firstxref == -1) + { + info_error ("No cross references in this node."); + return; + } + + /* There is at least one cross reference or menu entry in this node. + Try hard to find the next available one. */ + + nextmenu = info_search_in_node + (INFO_MENU_ENTRY_LABEL, node, window->point + dir, (WINDOW *)NULL, dir); + + nextxref = info_search_in_node + (INFO_XREF_LABEL, node, window->point + dir, (WINDOW *)NULL, dir); + +#if defined (HANDLE_MAN_PAGES) + if ((nextxref == -1) && (node->flags & N_IsManPage) && (firstxref != -1)) + nextxref = locate_manpage_xref (node, window->point + dir, dir); +#endif /* HANDLE_MAN_PAGES */ + + /* Ignore "Menu:" as a menu item. */ + if (nextmenu != -1) + { + char *text = node->contents + nextmenu; + + if (strncmp (text, INFO_MENU_LABEL, strlen (INFO_MENU_LABEL)) == 0) + nextmenu = info_search_in_node + (INFO_MENU_ENTRY_LABEL, node, nextmenu + dir, (WINDOW *)NULL, dir); + } + + /* If there is both a next menu entry, and a next xref entry, choose the + one which occurs first. Otherwise, select the one which actually + appears in this node following point. */ + if (nextmenu != -1 && nextxref != -1) + { + if (((dir == 1) && (nextmenu < nextxref)) || + ((dir == -1) && (nextmenu > nextxref))) + placement = nextmenu + 1; + else + placement = nextxref; + } + else if (nextmenu != -1) + placement = nextmenu + 1; + else if (nextxref != -1) + placement = nextxref; + + /* If there was neither a menu or xref entry appearing in this node after + point, choose the first menu or xref entry appearing in this node. */ + if (placement == -1) + { + if (firstmenu != -1 && firstxref != -1) + { + if (((dir == 1) && (firstmenu < firstxref)) || + ((dir == -1) && (firstmenu > firstxref))) + placement = firstmenu + 1; + else + placement = firstxref; + } + else if (firstmenu != -1) + placement = firstmenu + 1; + else + placement = firstxref; + } + window->point = placement; + window_adjust_pagetop (window); + window->flags |= W_UpdateWindow; +} + +DECLARE_INFO_COMMAND (info_move_to_prev_xref, + "Move to the previous cross reference") +{ + if (count < 0) + info_move_to_prev_xref (window, -count, key); + else + info_move_to_xref (window, count, key, -1); +} + +DECLARE_INFO_COMMAND (info_move_to_next_xref, + "Move to the next cross reference") +{ + if (count < 0) + info_move_to_next_xref (window, -count, key); + else + info_move_to_xref (window, count, key, 1); +} + +/* Select the menu item or reference that appears on this line. */ +DECLARE_INFO_COMMAND (info_select_reference_this_line, + "Select reference or menu item appearing on this line") +{ + char *line; + NODE *orig; + + line = window->line_starts[window_line_of_point (window)]; + orig = window->node; + + /* If this line contains a menu item, select that one. */ + if (strncmp ("* ", line, 2) == 0) + info_menu_or_ref_item (window, count, key, info_menu_of_node, 0); + else + info_menu_or_ref_item (window, count, key, info_xrefs_of_node, 0); +} + +/* **************************************************************** */ +/* */ +/* Miscellaneous Info Commands */ +/* */ +/* **************************************************************** */ + +/* What to do when C-g is pressed in a window. */ +DECLARE_INFO_COMMAND (info_abort_key, "Cancel current operation") +{ + /* If error printing doesn't oridinarily ring the bell, do it now, + since C-g always rings the bell. Otherwise, let the error printer + do it. */ + if (!info_error_rings_bell_p) + terminal_ring_bell (); + info_error ("Quit"); + + info_initialize_numeric_arg (); + info_clear_pending_input (); + info_last_executed_command = (VFunction *)NULL; +} + +/* Move the cursor to the desired line of the window. */ +DECLARE_INFO_COMMAND (info_move_to_window_line, + "Move to the cursor to a specific line of the window") +{ + int line; + + /* With no numeric argument of any kind, default to the center line. */ + if (!info_explicit_arg && count == 1) + line = (window->height / 2) + window->pagetop; + else + { + if (count < 0) + line = (window->height + count) + window->pagetop; + else + line = window->pagetop + count; + } + + /* If the line doesn't appear in this window, make it do so. */ + if ((line - window->pagetop) >= window->height) + line = window->pagetop + (window->height - 1); + + /* If the line is too small, make it fit. */ + if (line < window->pagetop) + line = window->pagetop; + + /* If the selected line is past the bottom of the node, force it back. */ + if (line >= window->line_count) + line = window->line_count - 1; + + window->point = (window->line_starts[line] - window->node->contents); +} + +/* Clear the screen and redraw its contents. Given a numeric argument, + move the line the cursor is on to the COUNT'th line of the window. */ +DECLARE_INFO_COMMAND (info_redraw_display, "Redraw the display") +{ + if ((!info_explicit_arg && count == 1) || echo_area_is_active) + { + terminal_clear_screen (); + display_clear_display (the_display); + window_mark_chain (windows, W_UpdateWindow); + display_update_display (windows); + } + else + { + int desired_line, point_line; + int new_pagetop; + + point_line = window_line_of_point (window) - window->pagetop; + + if (count < 0) + desired_line = window->height + count; + else + desired_line = count; + + if (desired_line < 0) + desired_line = 0; + + if (desired_line >= window->height) + desired_line = window->height - 1; + + if (desired_line == point_line) + return; + + new_pagetop = window->pagetop + (point_line - desired_line); + + set_window_pagetop (window, new_pagetop); + } +} +/* This command does nothing. It is the fact that a key is bound to it + that has meaning. See the code at the top of info_session (). */ +DECLARE_INFO_COMMAND (info_quit, "Quit using Info") +{} + + +/* **************************************************************** */ +/* */ +/* Reading Keys and Dispatching on Them */ +/* */ +/* **************************************************************** */ + +/* Declaration only. Special cased in info_dispatch_on_key (). */ +DECLARE_INFO_COMMAND (info_do_lowercase_version, "") +{} + +static void +dispatch_error (keyseq) + char *keyseq; +{ + char *rep; + + rep = pretty_keyseq (keyseq); + + if (!echo_area_is_active) + info_error ("Unknown command (%s).", rep); + else + { + char *temp; + + temp = (char *)xmalloc (1 + strlen (rep) + strlen ("\"\" is invalid")); + + sprintf (temp, "\"%s\" is invalid", rep); + terminal_ring_bell (); + inform_in_echo_area (temp); + free (temp); + } +} + +/* Keeping track of key sequences. */ +static char *info_keyseq = (char *)NULL; +static char keyseq_rep[100]; +static int info_keyseq_index = 0; +static int info_keyseq_size = 0; +static int info_keyseq_displayed_p = 0; + +/* Initialize the length of the current key sequence. */ +void +initialize_keyseq () +{ + info_keyseq_index = 0; + info_keyseq_displayed_p = 0; +} + +/* Add CHARACTER to the current key sequence. */ +void +add_char_to_keyseq (character) + char character; +{ + if (info_keyseq_index + 2 >= info_keyseq_size) + info_keyseq = (char *)xrealloc (info_keyseq, info_keyseq_size += 10); + + info_keyseq[info_keyseq_index++] = character; + info_keyseq[info_keyseq_index] = '\0'; +} + +/* Return the pretty printable string which represents KEYSEQ. */ +char * +pretty_keyseq (keyseq) + char *keyseq; +{ + register int i; + + keyseq_rep[0] = '\0'; + + for (i = 0; keyseq[i]; i++) + { + sprintf (keyseq_rep + strlen (keyseq_rep), "%s%s", + strlen (keyseq_rep) ? " " : "", + pretty_keyname (keyseq[i])); + } + + return (keyseq_rep); +} + +/* Display the current value of info_keyseq. If argument EXPECTING is + non-zero, input is expected to be read after the key sequence is + displayed, so add an additional prompting character to the sequence. */ +void +display_info_keyseq (expecting_future_input) + int expecting_future_input; +{ + char *rep; + + rep = pretty_keyseq (info_keyseq); + if (expecting_future_input) + strcat (rep, "-"); + + if (echo_area_is_active) + inform_in_echo_area (rep); + else + { + window_message_in_echo_area (rep); + display_cursor_at_point (active_window); + } + info_keyseq_displayed_p = 1; +} + +/* Called by interactive commands to read a keystroke. */ +unsigned char +info_get_another_input_char () +{ + int ready = 0; + + /* If there isn't any input currently available, then wait a + moment looking for input. If we don't get it fast enough, + prompt a little bit with the current key sequence. */ + if (!info_keyseq_displayed_p && + !info_any_buffered_input_p () && + !info_input_pending_p ()) + { +#if defined (FD_SET) + struct timeval timer; + fd_set readfds; + + FD_ZERO (&readfds); + FD_SET (fileno (info_input_stream), &readfds); + timer.tv_sec = 1; + timer.tv_usec = 750; + ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer); +#endif /* FD_SET */ + } + + if (!ready) + display_info_keyseq (1); + + return (info_get_input_char ()); +} + +/* Do the command associated with KEY in MAP. If the associated command is + really a keymap, then read another key, and dispatch into that map. */ +void +info_dispatch_on_key (key, map) + unsigned char key; + Keymap map; +{ + if (Meta_p (key) && (!ISO_Latin_p || map[key].function != ea_insert)) + { + if (map[ESC].type == ISKMAP) + { + map = (Keymap)map[ESC].function; + add_char_to_keyseq (ESC); + key = UnMeta (key); + info_dispatch_on_key (key, map); + } + else + { + dispatch_error (info_keyseq); + } + return; + } + + switch (map[key].type) + { + case ISFUNC: + { + VFunction *func; + + func = map[key].function; + if (func != (VFunction *)NULL) + { + /* Special case info_do_lowercase_version (). */ + if (func == info_do_lowercase_version) + { + info_dispatch_on_key (tolower (key), map); + return; + } + + add_char_to_keyseq (key); + + if (info_keyseq_displayed_p) + display_info_keyseq (0); + + { + WINDOW *where; + + where = active_window; + (*map[key].function) + (active_window, info_numeric_arg * info_numeric_arg_sign, key); + + /* If we have input pending, then the last command was a prefix + command. Don't change the value of the last function vars. + Otherwise, remember the last command executed in the var + appropriate to the window in which it was executed. */ + if (!info_input_pending_p ()) + { + if (where == the_echo_area) + ea_last_executed_command = map[key].function; + else + info_last_executed_command = map[key].function; + } + } + } + else + { + add_char_to_keyseq (key); + dispatch_error (info_keyseq); + return; + } + } + break; + + case ISKMAP: + add_char_to_keyseq (key); + if (map[key].function != (VFunction *)NULL) + { + unsigned char newkey; + + newkey = info_get_another_input_char (); + info_dispatch_on_key (newkey, (Keymap)map[key].function); + } + else + { + dispatch_error (info_keyseq); + return; + } + break; + } +} + +/* **************************************************************** */ +/* */ +/* Numeric Arguments */ +/* */ +/* **************************************************************** */ + +/* Handle C-u style numeric args, as well as M--, and M-digits. */ + +/* Non-zero means that an explicit argument has been passed to this + command, as in C-u C-v. */ +int info_explicit_arg = 0; + +/* The sign of the numeric argument. */ +int info_numeric_arg_sign = 1; + +/* The value of the argument itself. */ +int info_numeric_arg = 1; + +/* Add the current digit to the argument in progress. */ +DECLARE_INFO_COMMAND (info_add_digit_to_numeric_arg, + "Add this digit to the current numeric argument") +{ + info_numeric_arg_digit_loop (window, 0, key); +} + +/* C-u, universal argument. Multiply the current argument by 4. + Read a key. If the key has nothing to do with arguments, then + dispatch on it. If the key is the abort character then abort. */ +DECLARE_INFO_COMMAND (info_universal_argument, + "Start (or multiply by 4) the current numeric argument") +{ + info_numeric_arg *= 4; + info_numeric_arg_digit_loop (window, 0, 0); +} + +/* Create a default argument. */ +void +info_initialize_numeric_arg () +{ + info_numeric_arg = info_numeric_arg_sign = 1; + info_explicit_arg = 0; +} + +DECLARE_INFO_COMMAND (info_numeric_arg_digit_loop, + "Internally used by \\[universal-argument]") +{ + unsigned char pure_key; + Keymap keymap = window->keymap; + + while (1) + { + if (key) + pure_key = key; + else + { + if (display_was_interrupted_p && !info_any_buffered_input_p ()) + display_update_display (windows); + + if (active_window != the_echo_area) + display_cursor_at_point (active_window); + + pure_key = key = info_get_another_input_char (); + + if (Meta_p (key)) + add_char_to_keyseq (ESC); + + add_char_to_keyseq (UnMeta (key)); + } + + if (Meta_p (key)) + key = UnMeta (key); + + if (keymap[key].type == ISFUNC && + keymap[key].function == info_universal_argument) + { + info_numeric_arg *= 4; + key = 0; + continue; + } + + if (isdigit (key)) + { + if (info_explicit_arg) + info_numeric_arg = (info_numeric_arg * 10) + (key - '0'); + else + info_numeric_arg = (key - '0'); + info_explicit_arg = 1; + } + else + { + if (key == '-' && !info_explicit_arg) + { + info_numeric_arg_sign = -1; + info_numeric_arg = 1; + } + else + { + info_keyseq_index--; + info_dispatch_on_key (pure_key, keymap); + return; + } + } + key = 0; + } +} + +/* **************************************************************** */ +/* */ +/* Input Character Buffering */ +/* */ +/* **************************************************************** */ + +/* Character waiting to be read next. */ +static int pending_input_character = 0; + +/* How to make there be no pending input. */ +static void +info_clear_pending_input () +{ + pending_input_character = 0; +} + +/* How to set the pending input character. */ +static void +info_set_pending_input (key) + unsigned char key; +{ + pending_input_character = key; +} + +/* How to see if there is any pending input. */ +unsigned char +info_input_pending_p () +{ + return (pending_input_character); +} + +/* Largest number of characters that we can read in advance. */ +#define MAX_INFO_INPUT_BUFFERING 512 + +static int pop_index = 0, push_index = 0; +static unsigned char info_input_buffer[MAX_INFO_INPUT_BUFFERING]; + +/* Add KEY to the buffer of characters to be read. */ +static void +info_push_typeahead (key) + unsigned char key; +{ + /* Flush all pending input in the case of C-g pressed. */ + if (key == Control ('g')) + { + push_index = pop_index; + info_set_pending_input (Control ('g')); + } + else + { + info_input_buffer[push_index++] = key; + if (push_index >= sizeof (info_input_buffer)) + push_index = 0; + } +} + +/* Return the amount of space available in INFO_INPUT_BUFFER for new chars. */ +static int +info_input_buffer_space_available () +{ + if (pop_index > push_index) + return (pop_index - push_index); + else + return (sizeof (info_input_buffer) - (push_index - pop_index)); +} + +/* Get a key from the buffer of characters to be read. + Return the key in KEY. + Result is non-zero if there was a key, or 0 if there wasn't. */ +static int +info_get_key_from_typeahead (key) + unsigned char *key; +{ + if (push_index == pop_index) + return (0); + + *key = info_input_buffer[pop_index++]; + + if (pop_index >= sizeof (info_input_buffer)) + pop_index = 0; + + return (1); +} + +int +info_any_buffered_input_p () +{ + info_gather_typeahead (); + return (push_index != pop_index); +} + +/* Push KEY into the *front* of the input buffer. Returns non-zero if + successful, zero if there is no space left in the buffer. */ +static int +info_replace_key_to_typeahead (key) + unsigned char key; +{ + if (info_input_buffer_space_available ()) + { + pop_index--; + if (pop_index < 0) + pop_index = sizeof (info_input_buffer) - 1; + info_input_buffer[pop_index] = key; + return (1); + } + return (0); +} + +/* If characters are available to be read, then read them and stuff them into + info_input_buffer. Otherwise, do nothing. */ +void +info_gather_typeahead () +{ + register int i = 0; + int tty, space_avail; + long chars_avail; + unsigned char input[MAX_INFO_INPUT_BUFFERING]; + + tty = fileno (info_input_stream); + chars_avail = 0; + + space_avail = info_input_buffer_space_available (); + + /* If we can just find out how many characters there are to read, do so. */ +#if defined (FIONREAD) + { + ioctl (tty, FIONREAD, &chars_avail); + + if (chars_avail > space_avail) + chars_avail = space_avail; + + if (chars_avail) + read (tty, &input[0], chars_avail); + } +#else /* !FIONREAD */ +# if defined (O_NDELAY) + { + int flags; + + flags = fcntl (tty, F_GETFL, 0); + + fcntl (tty, F_SETFL, (flags | O_NDELAY)); + chars_avail = read (tty, &input[0], space_avail); + fcntl (tty, F_SETFL, flags); + + if (chars_avail == -1) + chars_avail = 0; + } +# endif /* O_NDELAY */ +#endif /* !FIONREAD */ + + while (i < chars_avail) + { + info_push_typeahead (input[i]); + i++; + } +} + +/* How to read a single character. */ +unsigned char +info_get_input_char () +{ + unsigned char keystroke; + + info_gather_typeahead (); + + if (pending_input_character) + { + keystroke = pending_input_character; + pending_input_character = 0; + } + else if (info_get_key_from_typeahead (&keystroke) == 0) + { + int rawkey; + + rawkey = getc (info_input_stream); + keystroke = rawkey; + + if (rawkey == EOF) + { + if (info_input_stream != stdin) + { + fclose (info_input_stream); + info_input_stream = stdin; + display_inhibited = 0; + display_update_display (windows); + display_cursor_at_point (active_window); + rawkey = getc (info_input_stream); + keystroke = rawkey; + } + + if (rawkey == EOF) + { + terminal_unprep_terminal (); + close_dribble_file (); + exit (0); + } + } + } + + if (info_dribble_file) + dribble (keystroke); + + return (keystroke); +}
new file mode 100644 --- /dev/null +++ b/info/session.h @@ -0,0 +1,146 @@ +/* session.h -- Functions found in session.c. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_SESSION_H_) +#define _SESSION_H_ + +#include "general.h" +#include "dribble.h" + +/* All commands that can be invoked from within info_session () receive + arguments in the same way. This simple define declares the header + of a function named NAME, with associated documentation DOC. The + documentation string is groveled out of the source files by the + utility program `makedoc', which is also responsible for making + the documentation/function-pointer maps. */ +#define DECLARE_INFO_COMMAND(name, doc) \ +void name (window, count, key) WINDOW *window; int count; unsigned char key; + +/* Variables found in session.h. */ +extern VFunction *info_last_executed_command; + +/* Variable controlling the garbage collection of files briefly visited + during searches. Such files are normally gc'ed, unless they were + compressed to begin with. If this variable is non-zero, it says + to gc even those file buffer contents which had to be uncompressed. */ +extern int gc_compressed_files; + +/* When non-zero, tiling takes place automatically when info_split_window + is called. */ +extern int auto_tiling_p; + +/* Variable controlling the behaviour of default scrolling when you are + already at the bottom of a node. */ +extern int info_scroll_behaviour; +extern char *info_scroll_choices[]; + +/* Values for info_scroll_behaviour. */ +#define IS_Continuous 0 /* Try to get first menu item, or failing that, the + "Next:" pointer, or failing that, the "Up:" and + "Next:" of the up. */ +#define IS_NextOnly 1 /* Try to get "Next:" menu item. */ +#define IS_PageOnly 2 /* Simply give up at the bottom of a node. */ + +/* Utility functions found in session.c */ +extern void info_dispatch_on_key (); +extern unsigned char info_get_input_char (), info_get_another_input_char (); +extern unsigned char info_input_pending_p (); +extern void remember_window_and_node (), set_remembered_pagetop_and_point (); +extern void set_window_pagetop (), info_set_node_of_window (); +extern char *pretty_keyseq (); +extern void initialize_keyseq (), add_char_to_keyseq (); +extern void info_gather_typeahead (); +extern FILE_BUFFER *file_buffer_of_window (); +extern long info_search_in_node (), info_target_search_node (); +extern void info_select_reference (); +extern int info_any_buffered_input_p (); +extern void print_node (); +extern void dump_node_to_file (), dump_nodes_to_file (); + +/* Do the physical deletion of WINDOW, and forget this window and + associated nodes. */ +extern void info_delete_window_internal (); + +/* Tell Info that input is coming from the file FILENAME. */ +extern void info_set_input_from_file (); + +#define return_if_control_g(val) \ + do { \ + info_gather_typeahead (); \ + if (info_input_pending_p () == Control ('g')) \ + return (val); \ + } while (0) + +/* The names of the functions that run an info session. */ + +/* Starting an info session. */ +extern void begin_multiple_window_info_session (), begin_info_session (); +extern void begin_info_session_with_error (), info_session (); +extern void info_read_and_dispatch (); + +/* Moving the point within a node. */ +extern void info_next_line (), info_prev_line (); +extern void info_end_of_line (), info_beginning_of_line (); +extern void info_forward_char (), info_backward_char (); +extern void info_forward_word (), info_backward_word (); +extern void info_beginning_of_node (), info_end_of_node (); +extern void info_move_to_prev_xref (), info_move_to_next_xref (); + +/* Scrolling text within a window. */ +extern void info_scroll_forward (), info_scroll_backward (); +extern void info_redraw_display (), info_toggle_wrap (); +extern void info_move_to_window_line (); + +/* Manipulating multiple windows. */ +extern void info_split_window (), info_delete_window (); +extern void info_keep_one_window (), info_grow_window (); +extern void info_scroll_other_window (), info_tile_windows (); +extern void info_next_window (), info_prev_window (); + +/* Selecting nodes. */ +extern void info_next_node (), info_prev_node (), info_up_node (); +extern void info_last_node (), info_first_node (), info_history_node (); +extern void info_goto_node (), info_top_node (), info_dir_node (); +extern void info_global_next_node (), info_global_prev_node (); +extern void info_kill_node (), info_view_file (); + +/* Selecting cross references. */ +extern void info_menu_digit (), info_menu_item (), info_xref_item (); +extern void info_find_menu (), info_select_reference_this_line (); + +/* Hacking numeric arguments. */ +extern int info_explicit_arg, info_numeric_arg, info_numeric_arg_sign; + +extern void info_add_digit_to_numeric_arg (), info_universal_argument (); +extern void info_initialize_numeric_arg (), info_numeric_arg_digit_loop (); + +/* Searching commands. */ +extern void info_search (), isearch_forward (), isearch_backward (); + +/* Dumping and printing nodes. */ +extern void info_print_node (); + +/* Miscellaneous commands. */ +extern void info_abort_key (), info_quit (), info_do_lowercase_version (); + +#endif /* _SESSION_H_ */
new file mode 100644 --- /dev/null +++ b/info/signals.c @@ -0,0 +1,173 @@ +/* signals.c -- Install and maintain Info signal handlers. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include "info.h" +#include "signals.h" + +/* **************************************************************** */ +/* */ +/* Pretending That We Have POSIX Signals */ +/* */ +/* **************************************************************** */ + +#if !defined (HAVE_SIGPROCMASK) && defined (HAVE_SIGSETMASK) +/* Perform OPERATION on NEWSET, perhaps leaving information in OLDSET. */ +static void +sigprocmask (operation, newset, oldset) + int operation, *newset, *oldset; +{ + switch (operation) + { + case SIG_UNBLOCK: + sigsetmask (sigblock (0) & ~(*newset)); + break; + + case SIG_BLOCK: + *oldset = sigblock (*newset); + break; + + case SIG_SETMASK: + sigsetmask (*newset); + break; + + default: + abort (); + } +} +#endif /* !HAVE_SIGPROCMASK && HAVE_SIGSETMASK */ + +/* **************************************************************** */ +/* */ +/* Signal Handling for Info */ +/* */ +/* **************************************************************** */ + +typedef void SigHandlerType; +typedef SigHandlerType SigHandler (); + +static SigHandlerType info_signal_handler (); +static SigHandler *old_TSTP, *old_TTOU, *old_TTIN; +static SigHandler *old_WINCH, *old_INT; + +void +initialize_info_signal_handler () +{ +#if defined (SIGTSTP) + old_TSTP = (SigHandler *) signal (SIGTSTP, info_signal_handler); + old_TTOU = (SigHandler *) signal (SIGTTOU, info_signal_handler); + old_TTIN = (SigHandler *) signal (SIGTTIN, info_signal_handler); +#endif /* SIGTSTP */ + +#if defined (SIGWINCH) + old_WINCH = (SigHandler *) signal (SIGWINCH, info_signal_handler); +#endif + +#if defined (SIGINT) + old_INT = (SigHandler *) signal (SIGINT, info_signal_handler); +#endif +} + +static void +redisplay_after_signal () +{ + terminal_clear_screen (); + display_clear_display (the_display); + window_mark_chain (windows, W_UpdateWindow); + display_update_display (windows); + display_cursor_at_point (active_window); + fflush (stdout); +} + +static SigHandlerType +info_signal_handler (sig) + int sig; +{ + SigHandler **old_signal_handler; + + switch (sig) + { +#if defined (SIGTSTP) + case SIGTSTP: + case SIGTTOU: + case SIGTTIN: +#endif +#if defined (SIGINT) + case SIGINT: +#endif + { +#if defined (SIGTSTP) + if (sig == SIGTSTP) + old_signal_handler = &old_TSTP; + if (sig == SIGTTOU) + old_signal_handler = &old_TTOU; + if (sig == SIGTTIN) + old_signal_handler = &old_TTIN; +#endif /* SIGTSTP */ + if (sig == SIGINT) + old_signal_handler = &old_INT; + + /* For stop signals, restore the terminal IO, leave the cursor + at the bottom of the window, and stop us. */ + terminal_goto_xy (0, screenheight - 1); + terminal_clear_to_eol (); + fflush (stdout); + terminal_unprep_terminal (); + signal (sig, *old_signal_handler); + UNBLOCK_SIGNAL (sig); + kill (getpid (), sig); + + /* The program is returning now. Restore our signal handler, + turn on terminal handling, redraw the screen, and place the + cursor where it belongs. */ + terminal_prep_terminal (); + *old_signal_handler = (SigHandler *) signal (sig, info_signal_handler); + redisplay_after_signal (); + fflush (stdout); + } + break; + +#if defined (SIGWINCH) + case SIGWINCH: + { + /* Turn off terminal IO, tell our parent that the window has changed, + then reinitialize the terminal and rebuild our windows. */ + old_signal_handler = &old_WINCH; + terminal_goto_xy (0, 0); + fflush (stdout); + terminal_unprep_terminal (); + signal (sig, *old_signal_handler); + UNBLOCK_SIGNAL (sig); + kill (getpid (), sig); + + /* After our old signal handler returns... */ + terminal_get_screen_size (); + terminal_prep_terminal (); + display_initialize_display (screenwidth, screenheight); + window_new_screen_size (screenwidth, screenheight, (VFunction *)NULL); + *old_signal_handler = (SigHandler *) signal (sig, info_signal_handler); + redisplay_after_signal (); + } + break; +#endif /* SIGWINCH */ + } +}
new file mode 100644 --- /dev/null +++ b/info/signals.h @@ -0,0 +1,89 @@ +/* signals.h -- Header to include system dependent signal definitions. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_SIGNALS_H_) +#define _SIGNALS_H_ + +#include <signal.h> + +#if !defined (HAVE_SIGPROCMASK) && !defined (sigmask) +# define sigmask(x) (1 << ((x)-1)) +#endif /* !HAVE_SIGPROCMASK && !sigmask */ + +#if !defined (HAVE_SIGPROCMASK) +# if !defined (SIG_BLOCK) +# define SIG_UNBLOCK 1 +# define SIG_BLOCK 2 +# define SIG_SETMASK 3 +# endif /* SIG_BLOCK */ + +/* Type of a signal set. */ +# define sigset_t int + +/* Make SET have no signals in it. */ +# define sigemptyset(set) (*(set) = (sigset_t)0x0) + +/* Make SET have the full range of signal specifications possible. */ +# define sigfillset(set) (*(set) = (sigset_t)0xffffffffff) + +/* Add SIG to the contents of SET. */ +# define sigaddset(set, sig) *(set) |= sigmask (sig) + +/* Delete SIG from the contents of SET. */ +# define sigdelset(set, sig) *(set) &= ~(sigmask (sig)) + +/* Tell if SET contains SIG. */ +# define sigismember(set, sig) (*(set) & (sigmask (sig))) + +/* Suspend the process until the reception of one of the signals + not present in SET. */ +# define sigsuspend(set) sigpause (*(set)) +#endif /* !HAVE_SIGPROCMASK */ + +#if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK) +/* These definitions are used both in POSIX and non-POSIX implementations. */ + +#define BLOCK_SIGNAL(sig) \ + do { \ + sigset_t nvar, ovar; \ + sigemptyset (&nvar); \ + sigemptyset (&ovar); \ + sigaddset (&nvar, sig); \ + sigprocmask (SIG_BLOCK, &nvar, &ovar); \ + } while (0) + +#define UNBLOCK_SIGNAL(sig) \ + do { \ + sigset_t nvar, ovar; \ + sigemptyset (&ovar); \ + sigemptyset (&nvar); \ + sigaddset (&nvar, sig); \ + sigprocmask (SIG_UNBLOCK, &nvar, &ovar); \ + } while (0) + +#else /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */ +# define BLOCK_SIGNAL(sig) +# define UNBLOCK_SIGNAL(sig) +#endif /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */ + +#endif /* !_SIGNALS_H_ */
new file mode 100644 --- /dev/null +++ b/info/strdup.c @@ -0,0 +1,43 @@ +/* strdup.c -- return a newly allocated copy of a string + Copyright (C) 1990 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#ifdef STDC_HEADERS +#include <string.h> +#include <stdlib.h> +#else +char *malloc (); +char *strcpy (); +#endif + +/* Return a newly allocated copy of STR, + or 0 if out of memory. */ + +char * +strdup (str) + const char *str; +{ + char *newstr; + + newstr = (char *) malloc (strlen (str) + 1); + if (newstr) + strcpy (newstr, str); + return newstr; +}
new file mode 100644 --- /dev/null +++ b/info/termdep.h @@ -0,0 +1,76 @@ +/* termdep.h -- System things that terminal.c depends on. + $Id: termdep.h,v 1.5 1996-11-13 03:41:44 jwe Exp $ + + This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993, 96 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_TERMDEP_H_) +# define _TERMDEP_H_ + +#if defined (HAVE_SYS_FCNTL_H) +# include <sys/fcntl.h> +#else +# include <fcntl.h> +#endif /* !HAVE_SYS_FCNTL_H */ + +#if defined (HAVE_SYS_FILE_H) +# include <sys/file.h> +#endif /* HAVE_SYS_FILE_H */ + +#if defined (HAVE_STRINGS_H) +# include <strings.h> +#else +# if defined (HAVE_STRING_H) +# include <string.h> +# endif +#endif + +#if defined (HAVE_TERMIOS_H) +# include <termios.h> +#else +# if defined (HAVE_TERMIO_H) +# include <termio.h> +# if defined (HAVE_SYS_PTEM_H) +# if defined (M_UNIX) || !defined (M_XENIX) +# include <sys/stream.h> +# include <sys/ptem.h> +# undef TIOCGETC +# else /* M_XENIX */ +# define tchars tc +# endif /* M_XENIX */ +# endif /* HAVE_SYS_PTEM_H */ +# else /* !HAVE_TERMIO_H */ +# include <sgtty.h> +# endif /* !HAVE_TERMIO_H */ +#endif /* !HAVE_TERMIOS_H */ + +#if defined (HAVE_SYS_TTOLD_H) +# include <sys/ttold.h> +#endif /* HAVE_SYS_TTOLD_H */ + +#if !defined (HAVE_STRCHR) +# undef strchr +# undef strrchr +# define strchr index +# define strrchr rindex +#endif /* !HAVE_STRCHR */ + +#endif /* _TERMDEP_H_ */
new file mode 100644 --- /dev/null +++ b/info/terminal.c @@ -0,0 +1,769 @@ +/* terminal.c -- How to handle the physical terminal for Info. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + This file has appeared in prior works by the Free Software Foundation; + thus it carries copyright dates from 1988 through 1993. + + Copyright (C) 1988, 89, 90, 91, 92, 93, 96 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include <stdio.h> +#include <sys/types.h> +#include "terminal.h" +#include "termdep.h" + +extern void *xmalloc (), *xrealloc (); + +/* The Unix termcap interface code. */ + +extern int tgetnum (), tgetflag (), tgetent (); +extern char *tgetstr (), *tgoto (); +extern char *getenv (); +extern void tputs (); + +/* Function "hooks". If you make one of these point to a function, that + function is called when appropriate instead of its namesake. Your + function is called with exactly the same arguments that were passed + to the namesake function. */ +VFunction *terminal_begin_inverse_hook = (VFunction *)NULL; +VFunction *terminal_end_inverse_hook = (VFunction *)NULL; +VFunction *terminal_prep_terminal_hook = (VFunction *)NULL; +VFunction *terminal_unprep_terminal_hook = (VFunction *)NULL; +VFunction *terminal_up_line_hook = (VFunction *)NULL; +VFunction *terminal_down_line_hook = (VFunction *)NULL; +VFunction *terminal_clear_screen_hook = (VFunction *)NULL; +VFunction *terminal_clear_to_eol_hook = (VFunction *)NULL; +VFunction *terminal_get_screen_size_hook = (VFunction *)NULL; +VFunction *terminal_goto_xy_hook = (VFunction *)NULL; +VFunction *terminal_initialize_terminal_hook = (VFunction *)NULL; +VFunction *terminal_new_terminal_hook = (VFunction *)NULL; +VFunction *terminal_put_text_hook = (VFunction *)NULL; +VFunction *terminal_ring_bell_hook = (VFunction *)NULL; +VFunction *terminal_write_chars_hook = (VFunction *)NULL; +VFunction *terminal_scroll_terminal_hook = (VFunction *)NULL; + +/* **************************************************************** */ +/* */ +/* Terminal and Termcap */ +/* */ +/* **************************************************************** */ + +/* On Solaris2, sys/types.h #includes sys/reg.h, which #defines PC. + Unfortunately, PC is a global variable used by the termcap library. */ +#undef PC + +/* TERMCAP requires these variables, whether we access them or not. */ +char PC; +char *BC, *UP; +short ospeed; + +/* A buffer which holds onto the current terminal description, and a pointer + used to float within it. */ +static char *term_buffer = (char *)NULL; +static char *term_string_buffer = (char *)NULL; + +/* Some strings to control terminal actions. These are output by tputs (). */ +static char *term_goto, *term_clreol, *term_cr, *term_clrpag; +static char *term_begin_use, *term_end_use; +static char *term_AL, *term_DL, *term_al, *term_dl; + +/* How to go up a line. */ +static char *term_up; + +/* How to go down a line. */ +static char *term_dn; + +/* An audible bell, if the terminal can be made to make noise. */ +static char *audible_bell; + +/* A visible bell, if the terminal can be made to flash the screen. */ +static char *visible_bell; + +/* The string to write to turn on the meta key, if this term has one. */ +static char *term_mm; + +/* The string to write to turn off the meta key, if this term has one. */ +static char *term_mo; + +/* The string to turn on inverse mode, if this term has one. */ +static char *term_invbeg; + +/* The string to turn off inverse mode, if this term has one. */ +static char *term_invend; + +static void +output_character_function (c) + int c; +{ + putc (c, stdout); +} + +/* Macro to send STRING to the terminal. */ +#define send_to_terminal(string) \ + do { \ + if (string) \ + tputs (string, 1, output_character_function); \ + } while (0) + +/* Tell the terminal that we will be doing cursor addressable motion. */ +static void +terminal_begin_using_terminal () +{ + send_to_terminal (term_begin_use); +} + +/* Tell the terminal that we will not be doing any more cursor addressable + motion. */ +static void +terminal_end_using_terminal () +{ + send_to_terminal (term_end_use); +} + +/* **************************************************************** */ +/* */ +/* Necessary Terminal Functions */ +/* */ +/* **************************************************************** */ + +/* The functions and variables on this page implement the user visible + portion of the terminal interface. */ + +/* The width and height of the terminal. */ +int screenwidth, screenheight; + +/* Non-zero means this terminal can't really do anything. */ +int terminal_is_dumb_p = 0; + +/* Non-zero means that this terminal has a meta key. */ +int terminal_has_meta_p = 0; + +/* Non-zero means that this terminal can produce a visible bell. */ +int terminal_has_visible_bell_p = 0; + +/* Non-zero means to use that visible bell if at all possible. */ +int terminal_use_visible_bell_p = 0; + +/* Non-zero means that the terminal can do scrolling. */ +int terminal_can_scroll = 0; + +/* The key sequences output by the arrow keys, if this terminal has any. */ +char *term_ku = (char *)NULL; +char *term_kd = (char *)NULL; +char *term_kr = (char *)NULL; +char *term_kl = (char *)NULL; + +/* Move the cursor to the terminal location of X and Y. */ +void +terminal_goto_xy (x, y) + int x, y; +{ + if (terminal_goto_xy_hook) + (*terminal_goto_xy_hook) (x, y); + else + { + if (term_goto) + tputs (tgoto (term_goto, x, y), 1, output_character_function); + } +} + +/* Print STRING to the terminal at the current position. */ +void +terminal_put_text (string) + char *string; +{ + if (terminal_put_text_hook) + (*terminal_put_text_hook) (string); + else + { + printf ("%s", string); + } +} + +/* Print NCHARS from STRING to the terminal at the current position. */ +void +terminal_write_chars (string, nchars) + char *string; + int nchars; +{ + if (terminal_write_chars_hook) + (*terminal_write_chars_hook) (string, nchars); + else + { + if (nchars) + fwrite (string, 1, nchars, stdout); + } +} + +/* Clear from the current position of the cursor to the end of the line. */ +void +terminal_clear_to_eol () +{ + if (terminal_clear_to_eol_hook) + (*terminal_clear_to_eol_hook) (); + else + { + send_to_terminal (term_clreol); + } +} + +/* Clear the entire terminal screen. */ +void +terminal_clear_screen () +{ + if (terminal_clear_screen_hook) + (*terminal_clear_screen_hook) (); + else + { + send_to_terminal (term_clrpag); + } +} + +/* Move the cursor up one line. */ +void +terminal_up_line () +{ + if (terminal_up_line_hook) + (*terminal_up_line_hook) (); + else + { + send_to_terminal (term_up); + } +} + +/* Move the cursor down one line. */ +void +terminal_down_line () +{ + if (terminal_down_line_hook) + (*terminal_down_line_hook) (); + else + { + send_to_terminal (term_dn); + } +} + +/* Turn on reverse video if possible. */ +void +terminal_begin_inverse () +{ + if (terminal_begin_inverse_hook) + (*terminal_begin_inverse_hook) (); + else + { + send_to_terminal (term_invbeg); + } +} + +/* Turn off reverse video if possible. */ +void +terminal_end_inverse () +{ + if (terminal_end_inverse_hook) + (*terminal_end_inverse_hook) (); + else + { + send_to_terminal (term_invend); + } +} + +/* Ring the terminal bell. The bell is run visibly if it both has one and + terminal_use_visible_bell_p is non-zero. */ +void +terminal_ring_bell () +{ + if (terminal_ring_bell_hook) + (*terminal_ring_bell_hook) (); + else + { + if (terminal_has_visible_bell_p && terminal_use_visible_bell_p) + send_to_terminal (visible_bell); + else + send_to_terminal (audible_bell); + } +} + +/* At the line START, delete COUNT lines from the terminal display. */ +static void +terminal_delete_lines (start, count) + int start, count; +{ + int lines; + + /* Normalize arguments. */ + if (start < 0) + start = 0; + + lines = screenheight - start; + terminal_goto_xy (0, start); + if (term_DL) + tputs (tgoto (term_DL, 0, count), lines, output_character_function); + else + { + while (count--) + tputs (term_dl, lines, output_character_function); + } + + fflush (stdout); +} + +/* At the line START, insert COUNT lines in the terminal display. */ +static void +terminal_insert_lines (start, count) + int start, count; +{ + int lines; + + /* Normalize arguments. */ + if (start < 0) + start = 0; + + lines = screenheight - start; + terminal_goto_xy (0, start); + + if (term_AL) + tputs (tgoto (term_AL, 0, count), lines, output_character_function); + else + { + while (count--) + tputs (term_al, lines, output_character_function); + } + + fflush (stdout); +} + +/* Scroll an area of the terminal, starting with the region from START + to END, AMOUNT lines. If AMOUNT is negative, the lines are scrolled + towards the top of the screen, else they are scrolled towards the + bottom of the screen. */ +void +terminal_scroll_terminal (start, end, amount) + int start, end, amount; +{ + if (!terminal_can_scroll) + return; + + /* Any scrolling at all? */ + if (amount == 0) + return; + + if (terminal_scroll_terminal_hook) + (*terminal_scroll_terminal_hook) (start, end, amount); + else + { + /* If we are scrolling down, delete AMOUNT lines at END. Then insert + AMOUNT lines at START. */ + if (amount > 0) + { + terminal_delete_lines (end, amount); + terminal_insert_lines (start, amount); + } + + /* If we are scrolling up, delete AMOUNT lines before START. This + actually does the upwards scroll. Then, insert AMOUNT lines + after the already scrolled region (i.e., END - AMOUNT). */ + if (amount < 0) + { + int abs_amount = -amount; + terminal_delete_lines (start - abs_amount, abs_amount); + terminal_insert_lines (end - abs_amount, abs_amount); + } + } +} + +/* Re-initialize the terminal considering that the TERM/TERMCAP variable + has changed. */ +void +terminal_new_terminal (terminal_name) + char *terminal_name; +{ + if (terminal_new_terminal_hook) + (*terminal_new_terminal_hook) (terminal_name); + else + { + terminal_initialize_terminal (terminal_name); + } +} + +/* Set the global variables SCREENWIDTH and SCREENHEIGHT. */ +void +terminal_get_screen_size () +{ + if (terminal_get_screen_size_hook) + (*terminal_get_screen_size_hook) (); + else + { + screenwidth = screenheight = 0; + +#if defined (TIOCGWINSZ) + { + struct winsize window_size; + + if (ioctl (fileno (stdout), TIOCGWINSZ, &window_size) == 0) + { + screenwidth = (int) window_size.ws_col; + screenheight = (int) window_size.ws_row; + } + } +#endif /* TIOCGWINSZ */ + + /* Environment variable COLUMNS overrides setting of "co". */ + if (screenwidth <= 0) + { + char *sw = getenv ("COLUMNS"); + + if (sw) + screenwidth = atoi (sw); + + if (screenwidth <= 0) + screenwidth = tgetnum ("co"); + } + + /* Environment variable LINES overrides setting of "li". */ + if (screenheight <= 0) + { + char *sh = getenv ("LINES"); + + if (sh) + screenheight = atoi (sh); + + if (screenheight <= 0) + screenheight = tgetnum ("li"); + } + + /* If all else fails, default to 80x24 terminal. */ + if (screenwidth <= 0) + screenwidth = 80; + + if (screenheight <= 0) + screenheight = 24; + } +} + +/* Initialize the terminal which is known as TERMINAL_NAME. If this terminal + doesn't have cursor addressability, TERMINAL_IS_DUMB_P becomes non-zero. + The variables SCREENHEIGHT and SCREENWIDTH are set to the dimensions that + this terminal actually has. The variable TERMINAL_HAS_META_P becomes non- + zero if this terminal supports a Meta key. Finally, the terminal screen is + cleared. */ +void +terminal_initialize_terminal (terminal_name) + char *terminal_name; +{ + char *term, *buffer; + + terminal_is_dumb_p = 0; + + if (terminal_initialize_terminal_hook) + { + (*terminal_initialize_terminal_hook) (terminal_name); + return; + } + + term = terminal_name ? terminal_name : getenv ("TERM"); + + if (!term_string_buffer) + term_string_buffer = (char *)xmalloc (2048); + + if (!term_buffer) + term_buffer = (char *)xmalloc (2048); + + buffer = term_string_buffer; + + term_clrpag = term_cr = term_clreol = (char *)NULL; + + if (!term) + term = "dumb"; + + if (tgetent (term_buffer, term) <= 0) + { + terminal_is_dumb_p = 1; + screenwidth = 80; + screenheight = 24; + term_cr = "\r"; + term_up = term_dn = audible_bell = visible_bell = (char *)NULL; + term_ku = term_kd = term_kl = term_kr = (char *)NULL; + return; + } + + BC = tgetstr ("pc", &buffer); + PC = BC ? *BC : 0; + +#if defined (TIOCGETP) + { + struct sgttyb sg; + + if (ioctl (fileno (stdout), TIOCGETP, &sg) != -1) + ospeed = sg.sg_ospeed; + else + ospeed = B9600; + } +#else + ospeed = B9600; +#endif /* !TIOCGETP */ + + term_cr = tgetstr ("cr", &buffer); + term_clreol = tgetstr ("ce", &buffer); + term_clrpag = tgetstr ("cl", &buffer); + term_goto = tgetstr ("cm", &buffer); + + /* Find out about this terminals scrolling capability. */ + term_AL = tgetstr ("AL", &buffer); + term_DL = tgetstr ("DL", &buffer); + term_al = tgetstr ("al", &buffer); + term_dl = tgetstr ("dl", &buffer); + + terminal_can_scroll = ((term_AL || term_al) && (term_DL || term_dl)); + + term_invbeg = tgetstr ("mr", &buffer); + if (term_invbeg) + term_invend = tgetstr ("me", &buffer); + else + term_invend = (char *)NULL; + + if (!term_cr) + term_cr = "\r"; + + terminal_get_screen_size (); + + term_up = tgetstr ("up", &buffer); + term_dn = tgetstr ("dn", &buffer); + visible_bell = tgetstr ("vb", &buffer); + terminal_has_visible_bell_p = (visible_bell != (char *)NULL); + audible_bell = tgetstr ("bl", &buffer); + if (!audible_bell) + audible_bell = "\007"; + term_begin_use = tgetstr ("ti", &buffer); + term_end_use = tgetstr ("te", &buffer); + + /* Check to see if this terminal has a meta key. */ + terminal_has_meta_p = (tgetflag ("km") || tgetflag ("MT")); + if (terminal_has_meta_p) + { + term_mm = tgetstr ("mm", &buffer); + term_mo = tgetstr ("mo", &buffer); + } + else + { + term_mm = (char *)NULL; + term_mo = (char *)NULL; + } + + /* Attempt to find the arrow keys. */ + term_ku = tgetstr ("ku", &buffer); + term_kd = tgetstr ("kd", &buffer); + term_kr = tgetstr ("kr", &buffer); + term_kl = tgetstr ("kl", &buffer); + + /* If this terminal is not cursor addressable, then it is really dumb. */ + if (!term_goto) + terminal_is_dumb_p = 1; + + terminal_begin_using_terminal (); +} + +/* **************************************************************** */ +/* */ +/* How to Read Characters From the Terminal */ +/* */ +/* **************************************************************** */ + +#if defined (TIOCGETC) +/* A buffer containing the terminal interrupt characters upon entry + to Info. */ +struct tchars original_tchars; +#endif + +#if defined (TIOCGLTC) +/* A buffer containing the local terminal mode characters upon entry + to Info. */ +struct ltchars original_ltchars; +#endif + +#if defined (HAVE_TERMIOS_H) +struct termios original_termios, ttybuff; +#else +# if defined (HAVE_TERMIO_H) +/* A buffer containing the terminal mode flags upon entry to info. */ +struct termio original_termio, ttybuff; +# else /* !HAVE_TERMIO_H */ +/* Buffers containing the terminal mode flags upon entry to info. */ +int original_tty_flags = 0; +int original_lmode; +struct sgttyb ttybuff; +# endif /* !HAVE_TERMIO_H */ +#endif /* !HAVE_TERMIOS_H */ + +/* Prepare to start using the terminal to read characters singly. */ +void +terminal_prep_terminal () +{ + int tty; + + if (terminal_prep_terminal_hook) + { + (*terminal_prep_terminal_hook) (); + return; + } + + tty = fileno (stdin); + +#if defined (HAVE_TERMIOS_H) + tcgetattr (tty, &original_termios); + tcgetattr (tty, &ttybuff); +#else +# if defined (HAVE_TERMIO_H) + ioctl (tty, TCGETA, &original_termio); + ioctl (tty, TCGETA, &ttybuff); +# endif +#endif + +#if defined (HAVE_TERMIOS_H) || defined (HAVE_TERMIO_H) + ttybuff.c_iflag &= (~ISTRIP & ~INLCR & ~IGNCR & ~ICRNL & ~IXON); + ttybuff.c_oflag &= (~ONLCR & ~OCRNL); + ttybuff.c_lflag &= (~ICANON & ~ECHO); + + ttybuff.c_cc[VMIN] = 1; + ttybuff.c_cc[VTIME] = 0; + + if (ttybuff.c_cc[VINTR] == '\177') + ttybuff.c_cc[VINTR] = -1; + + if (ttybuff.c_cc[VQUIT] == '\177') + ttybuff.c_cc[VQUIT] = -1; +#endif + +#if defined (HAVE_TERMIOS_H) + tcsetattr (tty, TCSANOW, &ttybuff); +#else +# if defined (HAVE_TERMIO_H) + ioctl (tty, TCSETA, &ttybuff); +# endif +#endif + +#if !defined (HAVE_TERMIOS_H) && !defined (HAVE_TERMIO_H) + ioctl (tty, TIOCGETP, &ttybuff); + + if (!original_tty_flags) + original_tty_flags = ttybuff.sg_flags; + + /* Make this terminal pass 8 bits around while we are using it. */ +# if defined (PASS8) + ttybuff.sg_flags |= PASS8; +# endif /* PASS8 */ + +# if defined (TIOCLGET) && defined (LPASS8) + { + int flags; + ioctl (tty, TIOCLGET, &flags); + original_lmode = flags; + flags |= LPASS8; + ioctl (tty, TIOCLSET, &flags); + } +# endif /* TIOCLGET && LPASS8 */ + +# if defined (TIOCGETC) + { + struct tchars temp; + + ioctl (tty, TIOCGETC, &original_tchars); + temp = original_tchars; + + /* C-s and C-q. */ + temp.t_startc = temp.t_stopc = -1; + + /* Often set to C-d. */ + temp.t_eofc = -1; + + /* If the a quit or interrupt character conflicts with one of our + commands, then make it go away. */ + if (temp.t_intrc == '\177') + temp.t_intrc = -1; + + if (temp.t_quitc == '\177') + temp.t_quitc = -1; + + ioctl (tty, TIOCSETC, &temp); + } +# endif /* TIOCGETC */ + +# if defined (TIOCGLTC) + { + struct ltchars temp; + + ioctl (tty, TIOCGLTC, &original_ltchars); + temp = original_ltchars; + + /* Make the interrupt keys go away. Just enough to make people happy. */ + temp.t_lnextc = -1; /* C-v. */ + temp.t_dsuspc = -1; /* C-y. */ + temp.t_flushc = -1; /* C-o. */ + ioctl (tty, TIOCSLTC, &temp); + } +# endif /* TIOCGLTC */ + + ttybuff.sg_flags &= ~ECHO; + ttybuff.sg_flags |= CBREAK; + ioctl (tty, TIOCSETN, &ttybuff); +#endif /* !HAVE_TERMIOS_H && !HAVE_TERMIO_H */ +} + +/* Restore the tty settings back to what they were before we started using + this terminal. */ +void +terminal_unprep_terminal () +{ + int tty; + + if (terminal_unprep_terminal_hook) + { + (*terminal_unprep_terminal_hook) (); + return; + } + + tty = fileno (stdin); + +#if defined (HAVE_TERMIOS_H) + tcsetattr (tty, TCSANOW, &original_termios); +#else +# if defined (HAVE_TERMIO_H) + ioctl (tty, TCSETA, &original_termio); +# else /* !HAVE_TERMIO_H */ + ioctl (tty, TIOCGETP, &ttybuff); + ttybuff.sg_flags = original_tty_flags; + ioctl (tty, TIOCSETN, &ttybuff); + +# if defined (TIOCGETC) + ioctl (tty, TIOCSETC, &original_tchars); +# endif /* TIOCGETC */ + +# if defined (TIOCGLTC) + ioctl (tty, TIOCSLTC, &original_ltchars); +# endif /* TIOCGLTC */ + +# if defined (TIOCLGET) && defined (LPASS8) + ioctl (tty, TIOCLSET, &original_lmode); +# endif /* TIOCLGET && LPASS8 */ + +# endif /* !HAVE_TERMIO_H */ +#endif /* !HAVE_TERMIOS_H */ + terminal_end_using_terminal (); +} +
new file mode 100644 --- /dev/null +++ b/info/terminal.h @@ -0,0 +1,129 @@ +/* terminal.h -- The external interface to terminal I/O. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993, 96 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_TERMINAL_H_) +#define _TERMINAL_H_ + +/* We use the following data type to talk about pointers to functions. */ +#if !defined (__FUNCTION_DEF) +# define __FUNCTION_DEF +typedef int Function (); +typedef void VFunction (); +#endif /* _FUNCTION_DEF */ + +/* For almost every function externally visible from terminal.c, there is + a corresponding "hook" function which can be bound in order to replace + the functionality of the one found in terminal.c. This is how we go + about implemented X window display. */ + +/* The width and height of the terminal. */ +extern int screenwidth, screenheight; + +/* Non-zero means this terminal can't really do anything. */ +extern int terminal_is_dumb_p; + +/* Non-zero means that this terminal has a meta key. */ +extern int terminal_has_meta_p; + +/* Non-zero means that this terminal can produce a visible bell. */ +extern int terminal_has_visible_bell_p; + +/* Non-zero means to use that visible bell if at all possible. */ +extern int terminal_use_visible_bell_p; + +/* Non-zero means that this terminal can scroll lines up and down. */ +extern int terminal_can_scroll; + +/* Initialize the terminal which is known as TERMINAL_NAME. If this terminal + doesn't have cursor addressability, TERMINAL_IS_DUMB_P becomes non-zero. + The variables SCREENHEIGHT and SCREENWIDTH are set to the dimensions that + this terminal actually has. The variable TERMINAL_HAS_META_P becomes non- + zero if this terminal supports a Meta key. */ +extern void terminal_initialize_terminal (); +extern VFunction *terminal_initialize_terminal_hook; + +/* Return the current screen width and height in the variables + SCREENWIDTH and SCREENHEIGHT. */ +extern void terminal_get_screen_size (); +extern VFunction *terminal_get_screen_size_hook; + +/* Save and restore tty settings. */ +extern void terminal_prep_terminal (), terminal_unprep_terminal (); +extern VFunction *terminal_prep_terminal_hook, *terminal_unprep_terminal_hook; + +/* Re-initialize the terminal to TERMINAL_NAME. */ +extern void terminal_new_terminal (); +extern VFunction *terminal_new_terminal_hook; + +/* Move the cursor to the terminal location of X and Y. */ +extern void terminal_goto_xy (); +extern VFunction *terminal_goto_xy_hook; + +/* Print STRING to the terminal at the current position. */ +extern void terminal_put_text (); +extern VFunction *terminal_put_text_hook; + +/* Print NCHARS from STRING to the terminal at the current position. */ +extern void terminal_write_chars (); +extern VFunction *terminal_write_chars_hook; + +/* Clear from the current position of the cursor to the end of the line. */ +extern void terminal_clear_to_eol (); +extern VFunction *terminal_clear_to_eol_hook; + +/* Clear the entire terminal screen. */ +extern void terminal_clear_screen (); +extern VFunction *terminal_clear_screen_hook; + +/* Move the cursor up one line. */ +extern void terminal_up_line (); +extern VFunction *terminal_up_line_hook; + +/* Move the cursor down one line. */ +extern void terminal_down_line (); +extern VFunction *terminal_down_line_hook; + +/* Turn on reverse video if possible. */ +extern void terminal_begin_inverse (); +extern VFunction *terminal_begin_inverse_hook; + +/* Turn off reverse video if possible. */ +extern void terminal_end_inverse (); +extern VFunction *terminal_end_inverse_hook; + +/* Scroll an area of the terminal, starting with the region from START + to END, AMOUNT lines. If AMOUNT is negative, the lines are scrolled + towards the top of the screen, else they are scrolled towards the + bottom of the screen. */ +extern void terminal_scroll_terminal (); +extern VFunction *terminal_scroll_terminal_hook; + +/* Ring the terminal bell. The bell is run visibly if it both has one and + terminal_use_visible_bell_p is non-zero. */ +extern void terminal_ring_bell (); +extern VFunction *terminal_ring_bell_hook; + +/* The key sequences output by the arrow keys, if this terminal has any. */ +extern char *term_ku, *term_kd, *term_kr, *term_kl; + +#endif /* !_TERMINAL_H_ */
new file mode 100644 --- /dev/null +++ b/info/tilde.c @@ -0,0 +1,376 @@ +/* tilde.c -- Tilde expansion code (~/foo := $HOME/foo). + $Id: tilde.c,v 1.5 1996-11-13 03:41:45 jwe Exp $ + + This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1988, 89, 90, 91, 92, 93, 96 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if defined (__GNUC__) +# define alloca __builtin_alloca +#else /* !__GNUC__ */ +# if defined (_AIX) + #pragma alloca +# else /* !_AIX */ +# if defined (HAVE_ALLOCA_H) +# include <alloca.h> +# endif /* HAVE_ALLOCA_H */ +# endif /* !AIX */ +#endif /* !__GNUC__ */ + +#if defined (HAVE_STDLIB_H) +#include <stdlib.h> +#endif + +#include "tilde.h" +#include <pwd.h> + +#if defined (HAVE_STRING_H) +#include <string.h> +#endif + +#include "clib.h" + +#if !defined (NULL) +# define NULL 0x0 +#endif + +#if defined (TEST) || defined (STATIC_MALLOC) +static void *xmalloc (), *xrealloc (); +#else +extern void *xmalloc (), *xrealloc (); +#endif /* TEST || STATIC_MALLOC */ + +/* The default value of tilde_additional_prefixes. This is set to + whitespace preceding a tilde so that simple programs which do not + perform any word separation get desired behaviour. */ +static char *default_prefixes[] = + { " ~", "\t~", (char *)NULL }; + +/* The default value of tilde_additional_suffixes. This is set to + whitespace or newline so that simple programs which do not + perform any word separation get desired behaviour. */ +static char *default_suffixes[] = + { " ", "\n", (char *)NULL }; + +/* If non-null, this contains the address of a function to call if the + standard meaning for expanding a tilde fails. The function is called + with the text (sans tilde, as in "foo"), and returns a malloc()'ed string + which is the expansion, or a NULL pointer if there is no expansion. */ +CFunction *tilde_expansion_failure_hook = (CFunction *)NULL; + +/* When non-null, this is a NULL terminated array of strings which + are duplicates for a tilde prefix. Bash uses this to expand + `=~' and `:~'. */ +char **tilde_additional_prefixes = default_prefixes; + +/* When non-null, this is a NULL terminated array of strings which match + the end of a username, instead of just "/". Bash sets this to + `:' and `=~'. */ +char **tilde_additional_suffixes = default_suffixes; + +/* Find the start of a tilde expansion in STRING, and return the index of + the tilde which starts the expansion. Place the length of the text + which identified this tilde starter in LEN, excluding the tilde itself. */ +static int +tilde_find_prefix (string, len) + char *string; + int *len; +{ + register int i, j, string_len; + register char **prefixes = tilde_additional_prefixes; + + string_len = strlen (string); + *len = 0; + + if (!*string || *string == '~') + return (0); + + if (prefixes) + { + for (i = 0; i < string_len; i++) + { + for (j = 0; prefixes[j]; j++) + { + if (strncmp (string + i, prefixes[j], strlen (prefixes[j])) == 0) + { + *len = strlen (prefixes[j]) - 1; + return (i + *len); + } + } + } + } + return (string_len); +} + +/* Find the end of a tilde expansion in STRING, and return the index of + the character which ends the tilde definition. */ +static int +tilde_find_suffix (string) + char *string; +{ + register int i, j, string_len; + register char **suffixes = tilde_additional_suffixes; + + string_len = strlen (string); + + for (i = 0; i < string_len; i++) + { + if (string[i] == '/' || !string[i]) + break; + + for (j = 0; suffixes && suffixes[j]; j++) + { + if (strncmp (string + i, suffixes[j], strlen (suffixes[j])) == 0) + return (i); + } + } + return (i); +} + +/* Return a new string which is the result of tilde expanding STRING. */ +char * +tilde_expand (string) + char *string; +{ + char *result, *tilde_expand_word (); + int result_size, result_index; + + result_size = result_index = 0; + result = (char *)NULL; + + /* Scan through STRING expanding tildes as we come to them. */ + while (1) + { + register int start, end; + char *tilde_word, *expansion; + int len; + + /* Make START point to the tilde which starts the expansion. */ + start = tilde_find_prefix (string, &len); + + /* Copy the skipped text into the result. */ + if ((result_index + start + 1) > result_size) + result = (char *)xrealloc (result, 1 + (result_size += (start + 20))); + + strncpy (result + result_index, string, start); + result_index += start; + + /* Advance STRING to the starting tilde. */ + string += start; + + /* Make END be the index of one after the last character of the + username. */ + end = tilde_find_suffix (string); + + /* If both START and END are zero, we are all done. */ + if (!start && !end) + break; + + /* Expand the entire tilde word, and copy it into RESULT. */ + tilde_word = (char *)xmalloc (1 + end); + strncpy (tilde_word, string, end); + tilde_word[end] = '\0'; + string += end; + + expansion = tilde_expand_word (tilde_word); + free (tilde_word); + + len = strlen (expansion); + if ((result_index + len + 1) > result_size) + result = (char *)xrealloc (result, 1 + (result_size += (len + 20))); + + strcpy (result + result_index, expansion); + result_index += len; + free (expansion); + } + + result[result_index] = '\0'; + + return (result); +} + +/* Do the work of tilde expansion on FILENAME. FILENAME starts with a + tilde. If there is no expansion, call tilde_expansion_failure_hook. */ +char * +tilde_expand_word (filename) + char *filename; +{ + char *dirname; + + dirname = filename ? strdup (filename) : (char *)NULL; + + if (dirname && *dirname == '~') + { + char *temp_name; + if (!dirname[1] || dirname[1] == '/') + { + /* Prepend $HOME to the rest of the string. */ + extern char *getenv (); + char *temp_home = getenv ("HOME"); + + /* If there is no HOME variable, look up the directory in + the password database. */ + if (!temp_home) + { + struct passwd *entry; + + entry = (struct passwd *) getpwuid (getuid ()); + if (entry) + temp_home = entry->pw_dir; + } + + temp_name = (char *) + alloca (1 + strlen (&dirname[1]) + + (temp_home ? strlen (temp_home) : 0)); + temp_name[0] = '\0'; + if (temp_home) + strcpy (temp_name, temp_home); + strcat (temp_name, &dirname[1]); + free (dirname); + dirname = strdup (temp_name); + } + else + { + struct passwd *user_entry; + char *username = (char *)alloca (257); + int i, c; + + for (i = 1; c = dirname[i]; i++) + { + if (c == '/') + break; + else + username[i - 1] = c; + } + username[i - 1] = '\0'; + + if (!(user_entry = (struct passwd *) getpwnam (username))) + { + /* If the calling program has a special syntax for + expanding tildes, and we couldn't find a standard + expansion, then let them try. */ + if (tilde_expansion_failure_hook) + { + char *expansion; + + expansion = (*tilde_expansion_failure_hook) (username); + + if (expansion) + { + temp_name = (char *)alloca + (1 + strlen (expansion) + strlen (&dirname[i])); + strcpy (temp_name, expansion); + strcat (temp_name, &dirname[i]); + free (expansion); + goto return_name; + } + } + /* We shouldn't report errors. */ + } + else + { + temp_name = (char *)alloca + (1 + strlen (user_entry->pw_dir) + strlen (&dirname[i])); + strcpy (temp_name, user_entry->pw_dir); + strcat (temp_name, &dirname[i]); + return_name: + free (dirname); + dirname = strdup (temp_name); + } + endpwent (); + } + } + return (dirname); +} + + +#if defined (TEST) +#undef NULL +#include <stdio.h> + +main (argc, argv) + int argc; + char **argv; +{ + char *result, line[512]; + int done = 0; + + while (!done) + { + printf ("~expand: "); + fflush (stdout); + + if (!gets (line)) + strcpy (line, "done"); + + if ((strcmp (line, "done") == 0) || + (strcmp (line, "quit") == 0) || + (strcmp (line, "exit") == 0)) + { + done = 1; + break; + } + + result = tilde_expand (line); + printf (" --> %s\n", result); + free (result); + } + exit (0); +} + +static void memory_error_and_abort (); + +static void * +xmalloc (bytes) + int bytes; +{ + void *temp = (void *)malloc (bytes); + + if (!temp) + memory_error_and_abort (); + return (temp); +} + +static void * +xrealloc (pointer, bytes) + void *pointer; + int bytes; +{ + void *temp; + + if (!pointer) + temp = (char *)malloc (bytes); + else + temp = (char *)realloc (pointer, bytes); + + if (!temp) + memory_error_and_abort (); + + return (temp); +} + +static void +memory_error_and_abort () +{ + fprintf (stderr, "readline: Out of virtual memory!\n"); + abort (); +} +#endif /* TEST */ +
new file mode 100644 --- /dev/null +++ b/info/tilde.h @@ -0,0 +1,58 @@ +/* tilde.h: Externally available variables and function in libtilde.a. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + This file has appeared in prior works by the Free Software Foundation; + thus it carries copyright dates from 1988 through 1993. + + Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993 Free Software + Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +/* Function pointers can be declared as (Function *)foo. */ +#if !defined (__FUNCTION_DEF) +# define __FUNCTION_DEF +typedef int Function (); +typedef void VFunction (); +typedef char *CFunction (); +#endif /* _FUNCTION_DEF */ + +/* If non-null, this contains the address of a function to call if the + standard meaning for expanding a tilde fails. The function is called + with the text (sans tilde, as in "foo"), and returns a malloc()'ed string + which is the expansion, or a NULL pointer if there is no expansion. */ +extern CFunction *tilde_expansion_failure_hook; + +/* When non-null, this is a NULL terminated array of strings which + are duplicates for a tilde prefix. Bash uses this to expand + `=~' and `:~'. */ +extern char **tilde_additional_prefixes; + +/* When non-null, this is a NULL terminated array of strings which match + the end of a username, instead of just "/". Bash sets this to + `:' and `=~'. */ +extern char **tilde_additional_suffixes; + +/* Return a new string which is the result of tilde expanding STRING. */ +extern char *tilde_expand (); + +/* Do the work of tilde expansion on FILENAME. FILENAME starts with a + tilde. If there is no expansion, call tilde_expansion_failure_hook. */ +extern char *tilde_expand_word (); +
new file mode 100644 --- /dev/null +++ b/info/userdoc.texi @@ -0,0 +1,1270 @@ +@c This file is meant to be included in any arbitrary piece of +@c documentation that wishes to describe the info program. Some day +@c info-stnd.texi should probably use this file instead of duplicating +@c its contents. +@c +@c This file documents the use of the standalone GNU Info program, +@c versions 2.7 and later. + +@ifclear InfoProgVer +@set InfoProgVer 2.11 +@end ifclear +@synindex vr cp +@synindex fn cp +@synindex ky cp + +@heading What is Info? + +This text documents the use of the GNU Info program, version +@value{InfoProgVer}. + +@dfn{Info} is a program which is used to view info files on an ASCII +terminal. @dfn{info files} are the result of processing texinfo files +with the program @code{makeinfo} or with the Emacs command @code{M-x +texinfo-format-buffer}. Finally, @dfn{texinfo} is a documentation +language which allows a printed manual and online documentation (an info +file) to be produced from a single source file. + +@menu +* Options:: Options you can pass on the command line. +* Cursor Commands:: Commands which move the cursor within a node. +* Scrolling Commands:: Commands for moving the node around in a window. +* Node Commands:: Commands for selecting a new node. +* Searching Commands:: Commands for searching an info file. +* Xref Commands:: Commands for selecting cross references. +* Window Commands:: Commands which manipulate multiple windows. +* Printing Nodes:: How to print out the contents of a node. +* Miscellaneous Commands:: A few commands that defy categories. +* Variables:: How to change the default behaviour of Info. +@ifset NOTSET +* Info for Sys Admins:: How to setup Info. Using special options. +@end ifset +@ifset STANDALONE +* GNU Info Global Index:: Global index containing keystrokes, command names, + variable names, and general concepts. +@end ifset +@end menu + +@node Options +@chapter Command Line Options +@cindex command line options +@cindex arguments, command line + +GNU Info accepts several options to control the initial node being +viewed, and to specify which directories to search for info files. Here +is a template showing an invocation of GNU Info from the shell: + +@example +info [--@var{option-name} @var{option-value}] @var{menu-item}@dots{} +@end example + +The following @var{option-names} are available when invoking Info from +the shell: + +@table @code +@cindex directory path +@item --directory @var{directory-path} +@itemx -d @var{directory-path} +Adds @var{directory-path} to the list of directory paths searched when +Info needs to find a file. You may issue @code{--directory} multiple +times; once for each directory which contains info files. +Alternatively, you may specify a value for the environment variable +@code{INFOPATH}; if @code{--directory} is not given, the value of +@code{INFOPATH} is used. The value of @code{INFOPATH} is a colon +separated list of directory names. If you do not supply +@code{INFOPATH} or @code{--directory-path} a default path is used. + +@item --file @var{filename} +@itemx -f @var{filename} +@cindex info file, selecting +Specifies a particular info file to visit. Instead of visiting the file +@code{dir}, Info will start with @code{(@var{filename})Top} as the first +file and node. + +@item --node @var{nodename} +@itemx -n @var{nodename} +@cindex node, selecting +Specifies a particular node to visit in the initial file loaded. This +is especially useful in conjunction with @code{--file}@footnote{Of +course, you can specify both the file and node in a @code{--node} +command; but don't forget to escape the open and close parentheses from +the shell as in: @code{info --node '(emacs)Buffers'}}. You may specify +@code{--node} multiple times; for an interactive Info, each +@var{nodename} is visited in its own window, for a non-interactive Info +(such as when @code{--output} is given) each @var{nodename} is processed +sequentially. + +@item --output @var{filename} +@itemx -o @var{filename} +@cindex file, outputting to +@cindex outputting to a file +Specify @var{filename} as the name of a file to output to. Each node +that Info visits will be output to @var{filename} instead of +interactively viewed. A value of @code{-} for @var{filename} specifies +the standard output. + +@item --subnodes +@cindex @code{--subnodes}, command line option +This option only has meaning when given in conjunction with +@code{--output}. It means to recursively output the nodes appearing in +the menus of each node being output. Menu items which resolve to +external info files are not output, and neither are menu items which are +members of an index. Each node is only output once. + +@item --help +@itemx -h +Produces a relatively brief description of the available Info options. + +@item --version +@cindex version information +Prints the version information of Info and exits. + +@item @var{menu-item} +@cindex menu, following +Remaining arguments to Info are treated as the names of menu items. The +first argument would be a menu item in the initial node visited, while +the second argument would be a menu item in the first argument's node. +You can easily move to the node of your choice by specifying the menu +names which describe the path to that node. For example, + +@example +info emacs buffers +@end example + +first selects the menu item @samp{Emacs} in the node @samp{(dir)Top}, +and then selects the menu item @samp{Buffers} in the node +@samp{(emacs)Top}. + +@end table + +@node Cursor Commands +@chapter Moving the Cursor +@cindex cursor, moving +Many people find that reading screens of text page by page is made +easier when one is able to indicate particular pieces of text with some +kind of pointing device. Since this is the case, GNU Info (both the +Emacs and standalone versions) have several commands which allow you to +move the cursor about the screen. The notation used in this manual to +describe keystrokes is identical to the notation used within the Emacs +manual, and the GNU Readline manual. @xref{Characters, , Character +Conventions, emacs, the GNU Emacs Manual}, if you are unfamilar with the +notation. + +The following table lists the basic cursor movement commands in Info. +Each entry consists of the key sequence you should type to execute the +cursor movement, the @code{M-x}@footnote{@code{M-x} is also a command; it +invokes @code{execute-extended-command}. @xref{M-x, , Executing an +extended command, emacs, the GNU Emacs Manual}, for more detailed +information.} command name (displayed in parentheses), and a short +description of what the command does. All of the cursor motion commands +can take an @dfn{numeric} argument (@pxref{Miscellaneous Commands, +@code{universal-argument}}), to find out how to supply them. With a +numeric argument, the motion commands are simply executed that +many times; for example, a numeric argument of 4 given to +@code{next-line} causes the cursor to move down 4 lines. With a +negative numeric argument, the motion is reversed; an argument of -4 +given to the @code{next-line} command would cause the cursor to move +@emph{up} 4 lines. + +@table @asis +@item @code{C-n} (@code{next-line}) +@kindex C-n +@findex next-line +Moves the cursor down to the next line. + +@item @code{C-p} (@code{prev-line}) +@kindex C-p +@findex prev-line +Move the cursor up to the previous line. + +@item @code{C-a} (@code{beginning-of-line}) +@kindex C-a, in Info windows +@findex beginning-of-line +Move the cursor to the start of the current line. + +@item @code{C-e} (@code{end-of-line}) +@kindex C-e, in Info windows +@findex end-of-line +Moves the cursor to the end of the current line. + +@item @code{C-f} (@code{forward-char}) +@kindex C-f, in Info windows +@findex forward-char +Move the cursor forward a character. + +@item @code{C-b} (@code{backward-char}) +@kindex C-b, in Info windows +@findex backward-char +Move the cursor backward a character. + +@item @code{M-f} (@code{forward-word}) +@kindex M-f, in Info windows +@findex forward-word +Moves the cursor forward a word. + +@item @code{M-b} (@code{backward-word}) +@kindex M-b, in Info winows +@findex backward-word +Moves the cursor backward a word. + +@item @code{M-<} (@code{beginning-of-node}) +@itemx @code{b} +@kindex b, in Info winows +@kindex M-< +@findex beginning-of-node +Moves the cursor to the start of the current node. + +@item @code{M->} (@code{end-of-node}) +@kindex M-> +@findex end-of-node +Moves the cursor to the end of the current node. + +@item @code{M-r} (@code{move-to-window-line}) +@kindex M-r +@findex move-to-window-line +Moves the cursor to a specific line of the window. Without a numeric +argument, @code{M-r} moves the cursor to the start of the line in the +center of the window. With a numeric argument of @var{n}, @code{M-r} +moves the cursor to the start of the @var{n}th line in the window. +@end table + +@node Scrolling Commands +@chapter Moving Text Within a Window +@cindex scrolling + +Sometimes you are looking at a screenful of text, and only part of the +current paragraph you are reading is visible on the screen. The +commands detailed in this section are used to shift which part of the +current node is visible on the screen. + +@table @asis +@item @code{SPC} (@code{scroll-forward}) +@itemx @code{C-v} +@kindex SPC, in Info windows +@kindex C-v +@findex scroll-forward +Shift the text in this window up. That is, show more of the node which +is currently below the bottom of the window. With a numeric argument, +show that many more lines at the bottom of the window; a numeric +argument of 4 would shift all of the text in the window up 4 lines +(discarding the top 4 lines), and show you four new lines at the bottom +of the window. Without a numeric argument, @key{SPC} takes the bottom +two lines of the window and places them at the top of the window, +redisplaying almost a completely new screenful of lines. + +@item @code{DEL} (@code{scroll-backward}) +@itemx @code{M-v} +@kindex DEL, in Info windows +@kindex M-v +@findex scroll-backward +Shift the text in this window down. The inverse of +@code{scroll-forward}. + +@end table + +@cindex scrolling through node structure +The @code{scroll-forward} and @code{scroll-backward} commands can also +move forward and backward through the node structure of the file. If +you press @key{SPC} while viewing the end of a node, or @key{DEL} while +viewing the beginning of a node, what happens is controlled by the +variable @code{scroll-behaviour}. @xref{Variables, +@code{scroll-behaviour}}, for more information. + +@table @asis +@item @code{C-l} (@code{redraw-display}) +@kindex C-l +@findex redraw-display +Redraw the display from scratch, or shift the line containing the cursor +to a specified location. With no numeric argument, @samp{C-l} clears +the screen, and then redraws its entire contents. Given a numeric +argument of @var{n}, the line containing the cursor is shifted so that +it is on the @var{n}th line of the window. + +@item @code{C-x w} (@code{toggle-wrap}) +@kindex C-w +@findex toggle-wrap +Toggles the state of line wrapping in the current window. Normally, +lines which are longer than the screen width @dfn{wrap}, i.e., they are +continued on the next line. Lines which wrap have a @samp{\} appearing +in the rightmost column of the screen. You can cause such lines to be +terminated at the rightmost column by changing the state of line +wrapping in the window with @code{C-x w}. When a line which needs more +space than one screen width to display is displayed, a @samp{$} appears +in the rightmost column of the screen, and the remainder of the line is +invisible. +@end table + +@node Node Commands +@chapter Selecting a New Node +@cindex nodes, selection of + +This section details the numerous Info commands which select a new node +to view in the current window. + +The most basic node commands are @samp{n}, @samp{p}, @samp{u}, and +@samp{l}. + +When you are viewing a node, the top line of the node contains some Info +@dfn{pointers} which describe where the next, previous, and up nodes +are. Info uses this line to move about the node structure of the file +when you use the following commands: + +@table @asis +@item @code{n} (@code{next-node}) +@kindex n +@findex next-node +Selects the `Next' node. + +@item @code{p} (@code{prev-node}) +@kindex p +@findex prev-node +Selects the `Prev' node. + +@item @code{u} (@code{up-node}) +@kindex u +@findex up-node +Selects the `Up' node. +@end table + +You can easily select a node that you have already viewed in this window +by using the @samp{l} command -- this name stands for "last", and +actually moves through the list of already visited nodes for this +window. @samp{l} with a negative numeric argument moves forward through +the history of nodes for this window, so you can quickly step between +two adjacent (in viewing history) nodes. + +@table @asis +@item @code{l} (@code{history-node}) +@kindex l +@findex history-node +Selects the most recently selected node in this window. +@end table + +Two additional commands make it easy to select the most commonly +selected nodes; they are @samp{t} and @samp{d}. + +@table @asis +@item @code{t} (@code{top-node}) +@kindex t +@findex top-node +Selects the node @samp{Top} in the current info file. + +@item @code{d} (@code{dir-node}) +@kindex d +@findex dir-node +Selects the directory node (i.e., the node @samp{(dir)}). +@end table + +Here are some other commands which immediately result in the selection +of a different node in the current window: + +@table @asis +@item @code{<} (@code{first-node}) +@kindex < +@findex first-node +Selects the first node which appears in this file. This node is most +often @samp{Top}, but it doesn't have to be. + +@item @code{>} (@code{last-node}) +@kindex > +@findex last-node +Selects the last node which appears in this file. + +@item @code{]} (@code{global-next-node}) +@kindex ] +@findex global-next-node +Moves forward or down through node structure. If the node that you are +currently viewing has a @samp{Next} pointer, that node is selected. +Otherwise, if this node has a menu, the first menu item is selected. If +there is no @samp{Next} and no menu, the same process is tried with the +@samp{Up} node of this node. + +@item @code{[} (@code{global-prev-node}) +@kindex [ +@findex global-prev-node +Moves backward or up through node structure. If the node that you are +currently viewing has a @samp{Prev} pointer, that node is selected. +Otherwise, if the node has an @samp{Up} pointer, that node is selected, +and if it has a menu, the last item in the menu is selected. +@end table + +You can get the same behaviour as @code{global-next-node} and +@code{global-prev-node} while simply scrolling through the file with +@key{SPC} and @key{DEL}; @xref{Variables, @code{scroll-behaviour}}, for +more information. + +@table @asis +@item @code{g} (@code{goto-node}) +@kindex g +@findex goto-node +Reads the name of a node and selects it. No completion is done while +reading the node name, since the desired node may reside in a separate +file. The node must be typed exactly as it appears in the info file. A +file name may be included as with any node specification, for example + +@example +@code{g(emacs)Buffers} +@end example + +finds the node @samp{Buffers} in the info file @file{emacs}. + +@item @code{C-x k} (@code{kill-node}) +@kindex C-x k +@findex kill-node +Kills a node. The node name is prompted for in the echo area, with a +default of the current node. @dfn{Killing} a node means that Info tries +hard to forget about it, removing it from the list of history nodes kept +for the window where that node is found. Another node is selected in +the window which contained the killed node. + +@item @code{C-x C-f} (@code{view-file}) +@kindex C-x C-f +@findex view-file +Reads the name of a file and selects the entire file. The command +@example +@code{C-x C-f @var{filename}} +@end example +is equivalent to typing +@example +@code{g(@var{filename})*} +@end example + +@item @code{C-x C-b} (@code{list-visited-nodes}) +@kindex C-x C-b +@findex list-visited-nodes +Makes a window containing a menu of all of the currently visited nodes. +This window becomes the selected window, and you may use the standard +Info commands within it. + +@item @code{C-x b} (@code{select-visited-node}) +@kindex C-x b +@findex select-visited-node +Selects a node which has been previously visited in a visible window. +This is similar to @samp{C-x C-b} followed by @samp{m}, but no window is +created. +@end table + +@node Searching Commands +@chapter Searching an Info File +@cindex searching + +GNU Info allows you to search for a sequence of characters throughout an +entire info file, search through the indices of an info file, or find +areas within an info file which discuss a particular topic. + +@table @asis +@item @code{s} (@code{search}) +@kindex s +@findex search +Reads a string in the echo area and searches for it. + +@item @code{C-s} (@code{isearch-forward}) +@kindex C-s +@findex isearch-forward +Interactively searches forward through the info file for a string as you +type it. + +@item @code{C-r} (@code{isearch-backward}) +@kindex C-r +@findex isearch-backward +Interactively searches backward through the info file for a string as +you type it. + +@item @code{i} (@code{index-search}) +@kindex i +@findex index-search +Looks up a string in the indices for this info file, and selects a node +where the found index entry points to. + +@item @code{,} (@code{next-index-match}) +@kindex , +@findex next-index-match +Moves to the node containing the next matching index item from the last +@samp{i} command. +@end table + +The most basic searching command is @samp{s} (@code{search}). The +@samp{s} command prompts you for a string in the echo area, and then +searches the remainder of the info file for an ocurrence of that string. +If the string is found, the node containing it is selected, and the +cursor is left positioned at the start of the found string. Subsequent +@samp{s} commands show you the default search string within @samp{[} and +@samp{]}; pressing @key{RET} instead of typing a new string will use the +default search string. + +@dfn{Incremental searching} is similar to basic searching, but the +string is looked up while you are typing it, instead of waiting until +the entire search string has been specified. + +@node Xref Commands +@chapter Selecting Cross References + +We have already discussed the @samp{Next}, @samp{Prev}, and @samp{Up} +pointers which appear at the top of a node. In addition to these +pointers, a node may contain other pointers which refer you to a +different node, perhaps in another info file. Such pointers are called +@dfn{cross references}, or @dfn{xrefs} for short. + +@menu +* Parts of an Xref:: What a cross reference is made of. +* Selecting Xrefs:: Commands for selecting menu or note items. +@end menu + +@node Parts of an Xref +@section Parts of an Xref + +Cross references have two major parts: the first part is called the +@dfn{label}; it is the name that you can use to refer to the cross +reference, and the second is the @dfn{target}; it is the full name of +the node that the cross reference points to. + +The target is separated from the label by a colon @samp{:}; first the +label appears, and then the target. For example, in the sample menu +cross reference below, the single colon separates the label from the +target. + +@example +* Foo Label: Foo Target. More information about Foo. +@end example + +Note the @samp{.} which ends the name of the target. The @samp{.} is +not part of the target; it serves only to let Info know where the target +name ends. + +A shorthand way of specifying references allows two adjacent colons to +stand for a target name which is the same as the label name: + +@example +* Foo Commands:: Commands pertaining to Foo. +@end example + +In the above example, the name of the target is the same as the name of +the label, in this case @code{Foo Commands}. + +You will normally see two types of cross references while viewing nodes: +@dfn{menu} references, and @dfn{note} references. Menu references +appear within a node's menu; they begin with a @samp{*} at the beginning +of a line, and continue with a label, a target, and a comment which +describes what the contents of the node pointed to contains. + +Note references appear within the body of the node text; they begin with +@code{*Note}, and continue with a label and a target. + +Like @samp{Next}, @samp{Prev} and @samp{Up} pointers, cross references +can point to any valid node. They are used to refer you to a place +where more detailed information can be found on a particular subject. +Here is a cross reference which points to a node within the Texinfo +documentation: @xref{xref, , Writing an Xref, texinfo, the Texinfo +Manual}, for more information on creating your own texinfo cross +references. + +@node Selecting Xrefs +@section Selecting Xrefs + +The following table lists the Info commands which operate on menu items. + +@table @asis +@item @code{1} (@code{menu-digit}) +@itemx @code{2} @dots{} @code{9} +@cindex 1 @dots{} 9, in Info windows +@kindex 1 @dots{} 9, in Info windows +@findex menu-digit +Within an Info window, pressing a single digit, (such as @samp{1}), +selects that menu item, and places its node in the current window. +For convenience, there is one exception; pressing @samp{0} selects the +@emph{last} item in the node's menu. + +@item @code{0} (@code{last-menu-item}) +@kindex 0, in Info windows +@findex last-menu-item +Select the last item in the current node's menu. + +@item @code{m} (@code{menu-item}) +@kindex m +@findex menu-item +Reads the name of a menu item in the echo area and selects its node. +Completion is available while reading the menu label. + +@item @code{M-x find-menu} +@findex find-menu +Moves the cursor to the start of this node's menu. +@end table + +This table lists the Info commands which operate on note cross references. + +@table @asis +@item @code{f} (@code{xref-item}) +@itemx @code{r} +@kindex f +@kindex r +@findex xref-item +Reads the name of a note cross reference in the echo area and selects +its node. Completion is available while reading the cross reference +label. +@end table + +Finally, the next few commands operate on menu or note references alike: + +@table @asis +@item @code{TAB} (@code{move-to-next-xref}) +@kindex TAB, in Info windows +@findex move-to-next-xref +Moves the cursor to the start of the next nearest menu item or note +reference in this node. You can then use @key{RET} +(@code{select-reference-this-line} to select the menu or note reference. + +@item @code{M-TAB} (@code{move-to-prev-xref}) +@kindex M-TAB, in Info windows +@findex move-to-prev-xref +Moves the cursor the start of the nearest previous menu item or note +reference in this node. + +@item @code{RET} (@code{select-reference-this-line}) +@kindex RET, in Info windows +@findex select-reference-this-line +Selects the menu item or note reference appearing on this line. +@end table + +@node Window Commands +@chapter Manipulating Multiple Windows +@cindex windows, manipulating + +A @dfn{window} is a place to show the text of a node. Windows have a +view area where the text of the node is displayed, and an associated +@dfn{mode line}, which briefly describes the node being viewed. + +GNU Info supports multiple windows appearing in a single screen; each +window is separated from the next by its modeline. At any time, there +is only one @dfn{active} window, that is, the window in which the cursor +appears. There are commands available for creating windows, changing +the size of windows, selecting which window is active, and for deleting +windows. + +@menu +* The Mode Line:: What appears in the mode line? +* Basic Windows:: Manipulating windows in Info. +* The Echo Area:: Used for displaying errors and reading input. +@end menu + +@node The Mode Line +@section The Mode Line + +A @dfn{mode line} is a line of inverse video which appears at the bottom +of an info window. It describes the contents of the window just above +it; this information includes the name of the file and node appearing in +that window, the number of screen lines it takes to display the node, +and the percentage of text that is above the top of the window. It can +also tell you if the indirect tags table for this info file needs to be +updated, and whether or not the info file was compressed when stored on +disk. + +Here is a sample mode line for a window containing an uncompressed file +named @file{dir}, showing the node @samp{Top}. + +@example +-----Info: (dir)Top, 40 lines --Top--------------------------------------- + ^^ ^ ^^^ ^^ + (file)Node #lines where +@end example + +When a node comes from a file which is compressed on disk, this is +indicated in the mode line with two small @samp{z}'s. In addition, if +the info file containing the node has been split into subfiles, the name +of the subfile containing the node appears in the modeline as well: + +@example +--zz-Info: (emacs)Top, 291 lines --Top-- Subfile: emacs-1.Z--------------- +@end example + +When Info makes a node internally, such that there is no corresponding +info file on disk, the name of the node is surrounded by asterisks +(@samp{*}). The name itself tells you what the contents of the window +are; the sample mode line below shows an internally constructed node +showing possible completions: + +@example +-----Info: *Completions*, 7 lines --All----------------------------------- +@end example + +@node Basic Windows +@section Window Commands + +It can be convenient to view more than one node at a time. To allow +this, Info can display more than one @dfn{window}. Each window has its +own mode line (@pxref{The Mode Line}) and history of nodes viewed in that +window (@pxref{Node Commands, , @code{history-node}}). + +@table @asis +@item @code{C-x o} (@code{next-window}) +@cindex windows, selecting +@kindex C-x o +@findex next-window +Selects the next window on the screen. Note that the echo area can only be +selected if it is already in use, and you have left it temporarily. +Normally, @samp{C-x o} simply moves the cursor into the next window on +the screen, or if you are already within the last window, into the first +window on the screen. Given a numeric argument, @samp{C-x o} moves over +that many windows. A negative argument causes @samp{C-x o} to select +the previous window on the screen. + +@item @code{M-x prev-window} +@findex prev-window +Selects the previous window on the screen. This is identical to +@samp{C-x o} with a negative argument. + +@item @code{C-x 2} (@code{split-window}) +@cindex windows, creating +@kindex C-x 2 +@findex split-window +Splits the current window into two windows, both showing the same node. +Each window is one half the size of the original window, and the cursor +remains in the original window. The variable @code{automatic-tiling} +can cause all of the windows on the screen to be resized for you +automatically, please @pxref{Variables, , automatic-tiling} for more +information. + +@item @code{C-x 0} (@code{delete-window}) +@cindex windows, deleting +@kindex C-x 0 +@findex delete-window +Deletes the current window from the screen. If you have made too many +windows and your screen appears cluttered, this is the way to get rid of +some of them. + +@item @code{C-x 1} (@code{keep-one-window}) +@kindex C-x 1 +@findex keep-one-window +Deletes all of the windows excepting the current one. + +@item @code{ESC C-v} (@code{scroll-other-window}) +@kindex ESC C-v, in Info windows +@findex scroll-other-window +Scrolls the other window, in the same fashion that @samp{C-v} might +scroll the current window. Given a negative argument, the "other" +window is scrolled backward. + +@item @code{C-x ^} (@code{grow-window}) +@kindex C-x ^ +@findex grow-window +Grows (or shrinks) the current window. Given a numeric argument, grows +the current window that many lines; with a negative numeric argument, +the window is shrunk instead. + +@item @code{C-x t} (@code{tile-windows}) +@cindex tiling +@kindex C-x t +@findex tile-windows +Divides the available screen space among all of the visible windows. +Each window is given an equal portion of the screen in which to display +its contents. The variable @code{automatic-tiling} can cause +@code{tile-windows} to be called when a window is created or deleted. +@xref{Variables, , @code{automatic-tiling}}. +@end table + +@node The Echo Area +@section The Echo Area +@cindex echo area + +The @dfn{echo area} is a one line window which appears at the bottom of +the screen. It is used to display informative or error messages, and to +read lines of input from you when that is necessary. Almost all of the +commands available in the echo area are identical to their Emacs +counterparts, so please refer to that documentation for greater depth of +discussion on the concepts of editing a line of text. The following +table briefly lists the commands that are available while input is being +read in the echo area: + +@table @asis +@item @code{C-f} (@code{echo-area-forward}) +@kindex C-f, in the echo area +@findex echo-area-forward +Moves forward a character. + +@item @code{C-b} (@code{echo-area-backward}) +@kindex C-b, in the echo area +@findex echo-area-backward +Moves backward a character. + +@item @code{C-a} (@code{echo-area-beg-of-line}) +@kindex C-a, in the echo area +@findex echo-area-beg-of-line +Moves to the start of the input line. + +@item @code{C-e} (@code{echo-area-end-of-line}) +@kindex C-e, in the echo area +@findex echo-area-end-of-line +Moves to the end of the input line. + +@item @code{M-f} (@code{echo-area-forward-word}) +@kindex M-f, in the echo area +@findex echo-area-forward-word +Moves forward a word. + +@item @code{M-b} (@code{echo-area-backward-word}) +@kindex M-b, in the echo area +@findex echo-area-backward-word +Moves backward a word. + +@item @code{C-d} (@code{echo-area-delete}) +@kindex C-d, in the echo area +@findex echo-area-delete +Deletes the character under the cursor. + +@item @code{DEL} (@code{echo-area-rubout}) +@kindex DEL, in the echo area +@findex echo-area-rubout +Deletes the character behind the cursor. + +@item @code{C-g} (@code{echo-area-abort}) +@kindex C-g, in the echo area +@findex echo-area-abort +Cancels or quits the current operation. If completion is being read, +@samp{C-g} discards the text of the input line which does not match any +completion. If the input line is empty, @samp{C-g} aborts the calling +function. + +@item @code{RET} (@code{echo-area-newline}) +@kindex RET, in the echo area +@findex echo-area-newline +Accepts (or forces completion of) the current input line. + +@item @code{C-q} (@code{echo-area-quoted-insert}) +@kindex C-q, in the echo area +@findex echo-area-quoted-insert +Inserts the next character verbatim. This is how you can insert control +characters into a search string, for example. + +@item @var{printing character} (@code{echo-area-insert}) +@kindex printing characters, in the echo area +@findex echo-area-insert +Inserts the character. + +@item @code{M-TAB} (@code{echo-area-tab-insert}) +@kindex M-TAB, in the echo area +@findex echo-area-tab-insert +Inserts a TAB character. + +@item @code{C-t} (@code{echo-area-transpose-chars}) +@kindex C-t, in the echo area +@findex echo-area-transpose-chars +Transposes the characters at the cursor. +@end table + +The next group of commands deal with @dfn{killing}, and @dfn{yanking} +text. For an in depth discussion of killing and yanking, +@pxref{Killing, , Killing and Deleting, emacs, the GNU Emacs Manual} + +@table @asis +@item @code{M-d} (@code{echo-area-kill-word}) +@kindex M-d, in the echo area +@findex echo-area-kill-word +Kills the word following the cursor. + +@item @code{M-DEL} (@code{echo-area-backward-kill-word}) +@kindex M-DEL, in the echo area +@findex echo-area-backward-kill-word +Kills the word preceding the cursor. + +@item @code{C-k} (@code{echo-area-kill-line}) +@kindex C-k, in the echo area +@findex echo-area-kill-line +Kills the text from the cursor to the end of the line. + +@item @code{C-x DEL} (@code{echo-area-backward-kill-line}) +@kindex C-x DEL, in the echo area +@findex echo-area-backward-kill-line +Kills the text from the cursor to the beginning of the line. + +@item @code{C-y} (@code{echo-area-yank}) +@kindex C-y, in the echo area +@findex echo-area-yank +Yanks back the contents of the last kill. + +@item @code{M-y} (@code{echo-area-yank-pop}) +@kindex M-y, in the echo area +@findex echo-area-yank-pop +Yanks back a previous kill, removing the last yanked text first. +@end table + +Sometimes when reading input in the echo area, the command that needed +input will only accept one of a list of several choices. The choices +represent the @dfn{possible completions}, and you must respond with one +of them. Since there are a limited number of responses you can make, +Info allows you to abbreviate what you type, only typing as much of the +response as is necessary to uniquely identify it. In addition, you can +request Info to fill in as much of the response as is possible; this +is called @dfn{completion}. + +The following commands are available when completing in the echo area: + +@table @asis +@item @code{TAB} (@code{echo-area-complete}) +@itemx @code{SPC} +@kindex TAB, in the echo area +@kindex SPC, in the echo area +@findex echo-area-complete +Inserts as much of a completion as is possible. + +@item @code{?} (@code{echo-area-possible-completions}) +@kindex ?, in the echo area +@findex echo-area-possible-completions +Displays a window containing a list of the possible completions of what +you have typed so far. For example, if the available choices are: +@example +bar +foliate +food +forget +@end example +and you have typed an @samp{f}, followed by @samp{?}, the possible +completions would contain: +@example +foliate +food +forget +@end example +i.e., all of the choices which begin with @samp{f}. Pressing @key{SPC} +or @key{TAB} would result in @samp{fo} appearing in the echo area, since +all of the choices which begin with @samp{f} continue with @samp{o}. +Now, typing @samp{l} followed by @samp{TAB} results in @samp{foliate} +appearing in the echo area, since that is the only choice which begins +with @samp{fol}. + +@item @code{ESC C-v} (@code{echo-area-scroll-completions-window}) +@kindex ESC C-v, in the echo area +@findex echo-area-scroll-completions-window +Scrolls the completions window, if that is visible, or the "other" +window if not. +@end table + +@node Printing Nodes +@chapter Printing Out Nodes +@cindex printing + +You may wish to print out the contents of a node as a quick reference +document for later use. Info provides you with a command for doing +this. In general, we recommend that you use @TeX{} to format the +document and print sections of it, by running @code{tex} on the texinfo +source file. + +@table @asis +@item @code{M-x print-node} +@findex print-node +@cindex INFO_PRINT_COMMAND, environment variable +Pipes the contents of the current node through the command in the +environment variable @code{INFO_PRINT_COMMAND}. If the variable doesn't +exist, the node is simply piped to @code{lpr}. +@end table + +@node Miscellaneous Commands +@chapter Miscellaneous Commands + +GNU Info contains several commands which self-document GNU Info: + +@table @asis +@item @code{M-x describe-command} +@cindex functions, describing +@cindex commands, describing +@findex describe-command +Reads the name of an Info command in the echo area and then displays a +brief description of what that command does. + +@item @code{M-x describe-key} +@cindex keys, describing +@findex describe-key +Reads a key sequence in the echo area, and then displays the name and +documentation of the Info command that the key sequence invokes. + +@item @code{M-x describe-variable} +Reads the name of a variable in the echo area and then displays a brief +description of what the variable affects. + +@item @code{M-x where-is} +@findex where-is +Reads the name of an Info command in the echo area, and then displays +a key sequence which can be typed in order to invoke that command. + +@item @code{C-h} (@code{get-help-window}) +@itemx @code{?} +@kindex C-h +@kindex ?, in Info windows +@findex get-help-window +Creates (or moves into) the window displaying @code{*Help*}, and places +a node containing a quick reference card into it. This window displays +the most concise information about GNU Info available. + +@item @code{h} (@code{get-info-help-node}) +@kindex h +@findex get-info-help-node +Tries hard to visit the node @code{(info)Help}. The info file +@file{info.texi} distributed with GNU Info contains this node. Of +course, the file must first be processed with @code{makeinfo}, and then +placed into the location of your info directory. +@end table + +Here are the commands for creating a numeric argument: + +@table @asis +@item @code{C-u} (@code{universal-argument}) +@cindex numeric arguments +@kindex C-u +@findex universal-argument +Starts (or multiplies by 4) the current numeric argument. @samp{C-u} is +a good way to give a small numeric argument to cursor movement or +scrolling commands; @samp{C-u C-v} scrolls the screen 4 lines, while +@samp{C-u C-u C-n} moves the cursor down 16 lines. + +@item @code{M-1} (@code{add-digit-to-numeric-arg}) +@itemx @code{M-2} @dots{} @code{M-9} +@kindex M-1 @dots{} M-9 +@findex add-digit-to-numeric-arg +Adds the digit value of the invoking key to the current numeric +argument. Once Info is reading a numeric argument, you may just type +the digits of the argument, without the Meta prefix. For example, you +might give @samp{C-l} a numeric argument of 32 by typing: + +@example +@kbd{C-u 3 2 C-l} +@end example +or +@example +@kbd{M-3 2 C-l} +@end example +@end table + +@samp{C-g} is used to abort the reading of a multi-character key +sequence, to cancel lengthy operations (such as multi-file searches) and +to cancel reading input in the echo area. + +@table @asis +@item @code{C-g} (@code{abort-key}) +@cindex cancelling typeahead +@cindex cancelling the current operation +@kindex C-g, in Info windows +@findex abort-key +Cancels current operation. +@end table + +The @samp{q} command of Info simply quits running Info. + +@table @asis +@item @code{q} (@code{quit}) +@cindex quitting +@kindex q +@findex quit +Exits GNU Info. +@end table + +If the operating system tells GNU Info that the screen is 60 lines tall, +and it is actually only 40 lines tall, here is a way to tell Info that +the operating system is correct. + +@table @asis +@item @code{M-x set-screen-height} +@findex set-screen-height +@cindex screen, changing the height of +Reads a height value in the echo area and sets the height of the +displayed screen to that value. +@end table + +Finally, Info provides a convenient way to display footnotes which might +be associated with the current node that you are viewing: + +@table @asis +@item @code{ESC C-f} (@code{show-footnotes}) +@kindex ESC C-f +@findex show-footnotes +@cindex footnotes, displaying +Shows the footnotes (if any) associated with the current node in another +window. You can have Info automatically display the footnotes +associated with a node when the node is selected by setting the variable +@code{automatic-footnotes}. @xref{Variables, , @code{automatic-footnotes}}. +@end table + +@node Variables +@chapter Manipulating Variables + +GNU Info contains several @dfn{variables} whose values are looked at by various +Info commands. You can change the values of these variables, and thus +change the behaviour of Info to more closely match your environment and +info file reading manner. + +@table @asis +@item @code{M-x set-variable} +@cindex variables, setting +@findex set-variable +Reads the name of a variable, and the value for it, in the echo area and +then sets the variable to that value. Completion is available when +reading the variable name; often, completion is available when reading +the value to give to the variable, but that depends on the variable +itself. If a variable does @emph{not} supply multiple choices to +complete over, it expects a numeric value. + +@item @code{M-x describe-variable} +@cindex variables, describing +@findex describe-variable +Reads the name of a variable in the echo area and then displays a brief +description of what the variable affects. +@end table + +Here is a list of the variables that you can set in Info. + +@table @code +@item automatic-footnotes +@vindex automatic-footnotes +When set to @code{On}, footnotes appear and disappear automatically. +This variable is @code{On} by default. When a node is selected, a +window containing the footnotes which appear in that node is created, +and the footnotes are displayed within the new window. The window that +Info creates to contain the footnotes is called @samp{*Footnotes*}. If +a node is selected which contains no footnotes, and a @samp{*Footnotes*} +window is on the screen, the @samp{*Footnotes*} window is deleted. +Footnote windows created in this fashion are not automatically tiled so +that they can use as little of the display as is possible. + +@item automatic-tiling +@vindex automatic-tiling +When set to @code{On}, creating or deleting a window resizes other +windows. This variable is @code{Off} by default. Normally, typing +@samp{C-x 2} divides the current window into two equal parts. When +@code{automatic-tiling} is set to @code{On}, all of the windows are +resized automatically, keeping an equal number of lines visible in each +window. There are exceptions to the automatic tiling; specifically, the +windows @samp{*Completions*} and @samp{*Footnotes*} are @emph{not} +resized through automatic tiling; they remain their original size. + +@item visible-bell +@vindex visible-bell +When set to @code{On}, GNU Info attempts to flash the screen instead of +ringing the bell. This variable is @code{Off} by default. Of course, +Info can only flash the screen if the terminal allows it; in the case +that the terminal does not allow it, the setting of this variable has no +effect. However, you can make Info perform quietly by setting the +@code{errors-ring-bell} variable to @code{Off}. + +@item errors-ring-bell +@vindex errors-ring-bell +When set to @code{On}, errors cause the bell to ring. The default +setting of this variable is @code{On}. + +@item gc-compressed-files +@vindex gc-compressed-files +When set to @code{On}, Info garbage collects files which had to be +uncompressed. The default value of this variable is @code{Off}. +Whenever a node is visited in Info, the info file containing that node +is read into core, and Info reads information about the tags and nodes +contained in that file. Once the tags information is read by Info, it +is never forgotten. However, the actual text of the nodes does not need +to remain in core unless a particular info window needs it. For +non-compressed files, the text of the nodes does not remain in core when +it is no longer in use. But de-compressing a file can be a time +consuming operation, and so Info tries hard not to do it twice. +@code{gc-compressed-files} tells Info it is okay to garbage collect the +text of the nodes of a file which was compressed on disk. + +@item show-index-match +@vindex show-index-match +When set to @code{On}, the portion of the matched search string is +highlighted in the message which explains where the matched search +string was found. The default value of this variable is @code{On}. +When Info displays the location where an index match was found, +(@pxref{Searching Commands, , @code{next-index-match}}), the portion of the +string that you had typed is highlighted by displaying it in the inverse +case from its surrounding characters. + +@item scroll-behaviour +@vindex scroll-behaviour +Controls what happens when forward scrolling is requested at the end of +a node, or when backward scrolling is requested at the beginning of a +node. The default value for this variable is @code{Continuous}. There +are three possible values for this variable: + +@table @code +@item Continuous +Tries to get the first item in this node's menu, or failing that, the +@samp{Next} node, or failing that, the @samp{Next} of the @samp{Up}. +This behaviour is identical to using the @samp{]} +(@code{global-next-node}) and @samp{[} (@code{global-prev-node}) +commands. + +@item Next Only +Only tries to get the @samp{Next} node. + +@item Page Only +Simply gives up, changing nothing. If @code{scroll-behaviour} is +@code{Page Only}, no scrolling command can change the node that is being +viewed. +@end table + +@item scroll-step +@vindex scroll-step +The number of lines to scroll when the cursor moves out of the window. +Scrolling happens automatically if the cursor has moved out of the +visible portion of the node text when it is time to display. Usually +the scrolling is done so as to put the cursor on the center line of the +current window. However, if the variable @code{scroll-step} has a +nonzero value, Info attempts to scroll the node text by that many lines; +if that is enough to bring the cursor back into the window, that is what +is done. The default value of this variable is 0, thus placing the +cursor (and the text it is attached to) in the center of the window. +Setting this variable to 1 causes a kind of "smooth scrolling" which +some people prefer. + +@item ISO-Latin +@cindex ISO Latin characters +@vindex ISO-Latin +When set to @code{On}, Info accepts and displays ISO Latin characters. +By default, Info assumes an ASCII character set. @code{ISO-Latin} tells +Info that it is running in an environment where the European standard +character set is in use, and allows you to input such characters to +Info, as well as display them. +@end table + +@c The following node and its children are currently unfinished. Please feel +@c free to finish it! + +@ifset NOTSET +@node Info for Sys Admins +@chapter Info for System Administrators + +This text describes some common ways of setting up an Info heierarchy +from scratch, and details the various options that are available when +installing Info. This text is designed for the person who is installing +GNU Info on the system; although users may find the information present +in this section interesting, none of it is vital to understanding how to +use GNU Info. + +@menu +* Setting the INFOPATH:: Where are my Info files kept? +* Editing the DIR node:: What goes in `DIR', and why? +* Storing Info files:: Alternate formats allow flexibilty in setups. +* Using `localdir':: Building DIR on the fly. +* Example setups:: Some common ways to origanize Info files. +@end menu + +@node Setting the INFOPATH +@section Setting the INFOPATH +Where are my Info files kept? + +@node Editing the DIR node +@section Editing the DIR node +What goes in `DIR', and why? + +@node Storing Info files +@section Storing Info files +Alternate formats allow flexibilty in setups. + +@node Using `localdir' +@section Using `localdir' +Building DIR on the fly. + +@node Example setups +@section Example setups +Some common ways to origanize Info files. +@end ifset + +@ifset STANDALONE +@node GNU Info Global Index +@appendix Global Index +@printindex cp +@end ifset
new file mode 100644 --- /dev/null +++ b/info/variables.c @@ -0,0 +1,272 @@ +/* variables.c -- How to manipulate user visible variables in Info. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include "info.h" +#include "variables.h" + +/* **************************************************************** */ +/* */ +/* User Visible Variables in Info */ +/* */ +/* **************************************************************** */ + +/* Choices used by the completer when reading a zero/non-zero value for + a variable. */ +static char *on_off_choices[] = { "Off", "On", (char *)NULL }; + +VARIABLE_ALIST info_variables[] = { + { "automatic-footnotes", + "When \"On\", footnotes appear and disappear automatically", + &auto_footnotes_p, (char **)on_off_choices }, + + { "automatic-tiling", + "When \"On\", creating or deleting a window resizes other windows", + &auto_tiling_p, (char **)on_off_choices }, + + { "visible-bell", + "When \"On\", flash the screen instead of ringing the bell", + &terminal_use_visible_bell_p, (char **)on_off_choices }, + + { "errors-ring-bell", + "When \"On\", errors cause the bell to ring", + &info_error_rings_bell_p, (char **)on_off_choices }, + + { "gc-compressed-files", + "When \"On\", Info garbage collects files which had to be uncompressed", + &gc_compressed_files, (char **)on_off_choices }, + { "show-index-match", + "When \"On\", the portion of the matched search string is highlighted", + &show_index_match, (char **)on_off_choices }, + + { "scroll-behaviour", + "Controls what happens when scrolling is requested at the end of a node", + &info_scroll_behaviour, (char **)info_scroll_choices }, + + { "scroll-step", + "The number lines to scroll when the cursor moves out of the window", + &window_scroll_step, (char **)NULL }, + + { "ISO-Latin", + "When \"On\", Info accepts and displays ISO Latin characters", + &ISO_Latin_p, (char **)on_off_choices }, + + { (char *)NULL, (char *)NULL, (int *)NULL, (char **)NULL } +}; + +DECLARE_INFO_COMMAND (describe_variable, "Explain the use of a variable") +{ + VARIABLE_ALIST *var; + char *description; + + /* Get the variable's name. */ + var = read_variable_name ("Describe variable: ", window); + + if (!var) + return; + + description = (char *)xmalloc (20 + strlen (var->name) + strlen (var->doc)); + + if (var->choices) + sprintf (description, "%s (%s): %s.", + var->name, var->choices[*(var->value)], var->doc); + else + sprintf (description, "%s (%d): %s.", var->name, *(var->value), var->doc); + + window_message_in_echo_area ("%s", description); + free (description); +} + +DECLARE_INFO_COMMAND (set_variable, "Set the value of an Info variable") +{ + VARIABLE_ALIST *var; + char *line; + + /* Get the variable's name and value. */ + var = read_variable_name ("Set variable: ", window); + + if (!var) + return; + + /* Read a new value for this variable. */ + { + char prompt[100]; + + if (!var->choices) + { + int potential_value; + + if (info_explicit_arg || count != 1) + potential_value = count; + else + potential_value = *(var->value); + + sprintf (prompt, "Set %s to value (%d): ", + var->name, potential_value); + line = info_read_in_echo_area (active_window, prompt); + + /* If no error was printed, clear the echo area. */ + if (!info_error_was_printed) + window_clear_echo_area (); + + /* User aborted? */ + if (!line) + return; + + /* If the user specified a value, get that, otherwise, we are done. */ + canonicalize_whitespace (line); + if (*line) + *(var->value) = atoi (line); + else + *(var->value) = potential_value; + + free (line); + } + else + { + register int i; + REFERENCE **array = (REFERENCE **)NULL; + int array_index = 0; + int array_slots = 0; + + for (i = 0; var->choices[i]; i++) + { + REFERENCE *entry; + + entry = (REFERENCE *)xmalloc (sizeof (REFERENCE)); + entry->label = strdup (var->choices[i]); + entry->nodename = (char *)NULL; + entry->filename = (char *)NULL; + + add_pointer_to_array + (entry, array_index, array, array_slots, 10, REFERENCE *); + } + + sprintf (prompt, "Set %s to value (%s): ", + var->name, var->choices[*(var->value)]); + + /* Ask the completer to read a variable value for us. */ + line = info_read_completing_in_echo_area (window, prompt, array); + + info_free_references (array); + + if (!echo_area_is_active) + window_clear_echo_area (); + + /* User aborted? */ + if (!line) + { + info_abort_key (active_window, 0, 0); + return; + } + + /* User accepted default choice? If so, no change. */ + if (!*line) + { + free (line); + return; + } + + /* Find the choice in our list of choices. */ + for (i = 0; var->choices[i]; i++) + if (strcmp (var->choices[i], line) == 0) + break; + + if (var->choices[i]) + *(var->value) = i; + } + } +} + +/* Read the name of an Info variable in the echo area and return the + address of a VARIABLE_ALIST member. A return value of NULL indicates + that no variable could be read. */ +VARIABLE_ALIST * +read_variable_name (prompt, window) + char *prompt; + WINDOW *window; +{ + register int i; + char *line; + REFERENCE **variables; + + /* Get the completion array of variable names. */ + variables = make_variable_completions_array (); + + /* Ask the completer to read a variable for us. */ + line = + info_read_completing_in_echo_area (window, prompt, variables); + + info_free_references (variables); + + if (!echo_area_is_active) + window_clear_echo_area (); + + /* User aborted? */ + if (!line) + { + info_abort_key (active_window, 0, 0); + return ((VARIABLE_ALIST *)NULL); + } + + /* User accepted "default"? (There is none.) */ + if (!*line) + { + free (line); + return ((VARIABLE_ALIST *)NULL); + } + + /* Find the variable in our list of variables. */ + for (i = 0; info_variables[i].name; i++) + if (strcmp (info_variables[i].name, line) == 0) + break; + + if (!info_variables[i].name) + return ((VARIABLE_ALIST *)NULL); + else + return (&(info_variables[i])); +} + +/* Make an array of REFERENCE which actually contains the names of the + variables available in Info. */ +REFERENCE ** +make_variable_completions_array () +{ + register int i; + REFERENCE **array = (REFERENCE **)NULL; + int array_index = 0, array_slots = 0; + + for (i = 0; info_variables[i].name; i++) + { + REFERENCE *entry; + + entry = (REFERENCE *)xmalloc (sizeof (REFERENCE)); + entry->label = strdup (info_variables[i].name); + entry->nodename = (char *)NULL; + entry->filename = (char *)NULL; + + add_pointer_to_array + (entry, array_index, array, array_slots, 200, REFERENCE *); + } + + return (array); +}
new file mode 100644 --- /dev/null +++ b/info/variables.h @@ -0,0 +1,64 @@ +/* variables.h -- Description of user visible variables in Info. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_VARIABLES_H_) +#define _VARIABLES_H_ + +/* A variable (in the Info sense) is an integer value with a user-visible + name. You may supply an array of strings to complete over when the + variable is set; in that case, the variable is set to the index of the + string that the user chose. If you supply a null list, the user can + set the variable to a numeric value. */ + +/* Structure describing a user visible variable. */ +typedef struct { + char *name; /* Polite name. */ + char *doc; /* Documentation string. */ + int *value; /* Address of value. */ + char **choices; /* Array of strings or NULL if numeric only. */ +} VARIABLE_ALIST; + +/* Read the name of an Info variable in the echo area and return the + address of a VARIABLE_ALIST member. A return value of NULL indicates + that no variable could be read. */ +extern VARIABLE_ALIST *read_variable_name (); + +/* Make an array of REFERENCE which actually contains the names of the + variables available in Info. */ +extern REFERENCE **make_variable_completions_array (); + +/* Set the value of an info variable. */ +extern void set_variable (); + +/* The list of user-visible variables. */ +extern int auto_footnotes_p; +extern int auto_tiling_p; +extern int terminal_use_visible_bell_p; +extern int info_error_rings_bell_p; +extern int gc_compressed_files; +extern int show_index_match; +extern int info_scroll_behaviour; +extern int window_scroll_step; +extern int ISO_Latin_p; + +#endif /* _VARIABLES_H_ */
new file mode 100644 --- /dev/null +++ b/info/window.c @@ -0,0 +1,1482 @@ +/* window.c -- Windows in Info. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include <stdio.h> +#include <ctype.h> +#include <sys/types.h> +#include <sys/stat.h> +#include "nodes.h" +#include "window.h" +#include "display.h" +#include "info-utils.h" +#include "infomap.h" + +/* The window which describes the screen. */ +WINDOW *the_screen = (WINDOW *)NULL; + +/* The window which describes the echo area. */ +WINDOW *the_echo_area = (WINDOW *)NULL; + +/* The list of windows in Info. */ +WINDOW *windows = (WINDOW *)NULL; + +/* Pointer to the active window in WINDOW_LIST. */ +WINDOW *active_window = (WINDOW *)NULL; + +/* The size of the echo area in Info. It never changes, irregardless of the + size of the screen. */ +#define ECHO_AREA_HEIGHT 1 + +/* Macro returns the amount of space that the echo area truly requires relative + to the entire screen. */ +#define echo_area_required (1 + the_echo_area->height) + +/* Initalize the window system by creating THE_SCREEN and THE_ECHO_AREA. + Create the first window ever. + You pass the dimensions of the total screen size. */ +void +window_initialize_windows (width, height) + int width, height; +{ + the_screen = (WINDOW *)xmalloc (sizeof (WINDOW)); + the_echo_area = (WINDOW *)xmalloc (sizeof (WINDOW)); + windows = (WINDOW *)xmalloc (sizeof (WINDOW)); + active_window = windows; + + zero_mem (the_screen, sizeof (WINDOW)); + zero_mem (the_echo_area, sizeof (WINDOW)); + zero_mem (active_window, sizeof (WINDOW)); + + /* None of these windows has a goal column yet. */ + the_echo_area->goal_column = -1; + active_window->goal_column = -1; + the_screen->goal_column = -1; + + /* The active and echo_area windows are visible. + The echo_area is permanent. + The screen is permanent. */ + active_window->flags = W_WindowVisible; + the_echo_area->flags = W_WindowIsPerm | W_InhibitMode | W_WindowVisible; + the_screen->flags = W_WindowIsPerm; + + /* The height of the echo area never changes. It is statically set right + here, and it must be at least 1 line for display. The size of the + initial window cannot be the same size as the screen, since the screen + includes the echo area. So, we make the height of the initial window + equal to the screen's displayable region minus the height of the echo + area. */ + the_echo_area->height = ECHO_AREA_HEIGHT; + active_window->height = the_screen->height - 1 - the_echo_area->height; + window_new_screen_size (width, height, (VFunction *)NULL); + + /* The echo area uses a different keymap than normal info windows. */ + the_echo_area->keymap = echo_area_keymap; + active_window->keymap = info_keymap; +} + +/* Given that the size of the screen has changed to WIDTH and HEIGHT + from whatever it was before (found in the_screen->height, ->width), + change the size (and possibly location) of each window in the screen. + If a window would become too small, call the function DELETER on it, + after deleting the window from our chain of windows. If DELETER is NULL, + nothing extra is done. The last window can never be deleted, but it can + become invisible. */ + +/* If non-null, a function to call with WINDOW as argument when the function + window_new_screen_size () has deleted WINDOW. */ +VFunction *window_deletion_notifier = (VFunction *)NULL; + +void +window_new_screen_size (width, height) + int width, height; +{ + register WINDOW *win; + int delta_height, delta_each, delta_leftover; + int numwins; + + /* If no change, do nothing. */ + if (width == the_screen->width && height == the_screen->height) + return; + + /* If the new window height is too small, make it be zero. */ + if (height < (WINDOW_MIN_SIZE + the_echo_area->height)) + height = 0; + if (width < 0) + width = 0; + + /* Find out how many windows will change. */ + for (numwins = 0, win = windows; win; win = win->next, numwins++); + + /* See if some windows will need to be deleted. This is the case if + the screen is getting smaller, and the available space divided by + the number of windows is less than WINDOW_MIN_SIZE. In that case, + delete some windows and try again until there is either enough + space to divy up among the windows, or until there is only one + window left. */ + while ((height - echo_area_required) / numwins <= WINDOW_MIN_SIZE) + { + /* If only one window, make the size of it be zero, and return + immediately. */ + if (!windows->next) + { + windows->height = 0; + maybe_free (windows->line_starts); + windows->line_starts = (char **)NULL; + windows->line_count = 0; + break; + } + + /* If we have some temporary windows, delete one of them. */ + for (win = windows; win; win = win->next) + if (win->flags & W_TempWindow) + break; + + /* Otherwise, delete the first window, and try again. */ + if (!win) + win = windows; + + if (window_deletion_notifier) + (*window_deletion_notifier) (win); + + window_delete_window (win); + numwins--; + } + + /* The screen has changed height and width. */ + delta_height = height - the_screen->height; /* This is how much. */ + the_screen->height = height; /* This is the new height. */ + the_screen->width = width; /* This is the new width. */ + + /* Set the start of the echo area. */ + the_echo_area->first_row = height - the_echo_area->height; + the_echo_area->width = width; + + /* Check to see if the screen can really be changed this way. */ + if ((!windows->next) && ((windows->height == 0) && (delta_height < 0))) + return; + + /* Divide the change in height among the available windows. */ + delta_each = delta_height / numwins; + delta_leftover = delta_height - (delta_each * numwins); + + /* Change the height of each window in the chain by delta_each. Change + the height of the last window in the chain by delta_each and by the + leftover amount of change. Change the width of each window to be + WIDTH. */ + for (win = windows; win; win = win->next) + { + if ((win->width != width) && ((win->flags & W_InhibitMode) == 0)) + { + win->width = width; + maybe_free (win->modeline); + win->modeline = (char *)xmalloc (1 + width); + } + + win->height += delta_each; + + /* If the previous height of this window was zero, it was the only + window, and it was not visible. Thus we need to compensate for + the echo_area. */ + if (win->height == delta_each) + win->height -= (1 + the_echo_area->height); + + /* If this is not the first window in the chain, then change the + first row of it. We cannot just add delta_each to the first row, + since this window's first row is the sum of the collective increases + that have gone before it. So we just add one to the location of the + previous window's modeline. */ + if (win->prev) + win->first_row = (win->prev->first_row + win->prev->height) + 1; + + /* The last window in the chain gets the extra space (or shrinkage). */ + if (!win->next) + win->height += delta_leftover; + + if (win->node) + recalculate_line_starts (win); + + win->flags |= W_UpdateWindow; + } + + /* If the screen got smaller, check over the windows just shrunk to + keep them within bounds. Some of the windows may have gotten smaller + than WINDOW_MIN_HEIGHT in which case some of the other windows are + larger than the available display space in the screen. Because of our + intial test above, we know that there is enough space for all of the + windows. */ + if ((delta_each < 0) && ((windows->height != 0) && windows->next)) + { + int avail; + + avail = the_screen->height - (numwins + the_echo_area->height); + win = windows; + + while (win) + { + if ((win->height < WINDOW_MIN_HEIGHT) || + (win->height > avail)) + { + WINDOW *lastwin; + + /* Split the space among the available windows. */ + delta_each = avail / numwins; + delta_leftover = avail - (delta_each * numwins); + + for (win = windows; win; win = win->next) + { + lastwin = win; + if (win->prev) + win->first_row = + (win->prev->first_row + win->prev->height) + 1; + win->height = delta_each; + } + + /* Give the leftover space (if any) to the last window. */ + lastwin->height += delta_leftover; + break; + } + else + win= win->next; + } + } +} + +/* Make a new window showing NODE, and return that window structure. + If NODE is passed as NULL, then show the node showing in the active + window. If the window could not be made return a NULL pointer. The + active window is not changed.*/ +WINDOW * +window_make_window (node) + NODE *node; +{ + WINDOW *window; + + if (!node) + node = active_window->node; + + /* If there isn't enough room to make another window, return now. */ + if ((active_window->height / 2) < WINDOW_MIN_SIZE) + return ((WINDOW *)NULL); + + /* Make and initialize the new window. + The fudging about with -1 and +1 is because the following window in the + chain cannot start at window->height, since that is where the modeline + for the previous window is displayed. The inverse adjustment is made + in window_delete_window (). */ + window = (WINDOW *)xmalloc (sizeof (WINDOW)); + window->width = the_screen->width; + window->height = (active_window->height / 2) - 1; +#if defined (SPLIT_BEFORE_ACTIVE) + window->first_row = active_window->first_row; +#else + window->first_row = active_window->first_row + + (active_window->height - window->height); +#endif + window->keymap = info_keymap; + window->goal_column = -1; + window->modeline = (char *)xmalloc (1 + window->width); + window->line_starts = (char **)NULL; + window->flags = W_UpdateWindow | W_WindowVisible; + window_set_node_of_window (window, node); + + /* Adjust the height of the old active window. */ + active_window->height -= (window->height + 1); +#if defined (SPLIT_BEFORE_ACTIVE) + active_window->first_row += (window->height + 1); +#endif + active_window->flags |= W_UpdateWindow; + + /* Readjust the new and old windows so that their modelines and contents + will be displayed correctly. */ +#if defined (NOTDEF) + /* We don't have to do this for WINDOW since window_set_node_of_window () + already did. */ + window_adjust_pagetop (window); + window_make_modeline (window); +#endif /* NOTDEF */ + + /* We do have to readjust the existing active window. */ + window_adjust_pagetop (active_window); + window_make_modeline (active_window); + +#if defined (SPLIT_BEFORE_ACTIVE) + /* This window is just before the active one. The active window gets + bumped down one. The active window is not changed. */ + window->next = active_window; + + window->prev = active_window->prev; + active_window->prev = window; + + if (window->prev) + window->prev->next = window; + else + windows = window; +#else + /* This window is just after the active one. Which window is active is + not changed. */ + window->prev = active_window; + window->next = active_window->next; + active_window->next = window; + if (window->next) + window->next->prev = window; +#endif /* !SPLIT_BEFORE_ACTIVE */ + return (window); +} + +/* These useful macros make it possible to read the code in + window_change_window_height (). */ +#define grow_me_shrinking_next(me, next, diff) \ + do { \ + me->height += diff; \ + next->height -= diff; \ + next->first_row += diff; \ + window_adjust_pagetop (next); \ + } while (0) + +#define grow_me_shrinking_prev(me, prev, diff) \ + do { \ + me->height += diff; \ + prev->height -= diff; \ + me->first_row -=diff; \ + window_adjust_pagetop (prev); \ + } while (0) + +#define shrink_me_growing_next(me, next, diff) \ + do { \ + me->height -= diff; \ + next->height += diff; \ + next->first_row -= diff; \ + window_adjust_pagetop (next); \ + } while (0) + +#define shrink_me_growing_prev(me, prev, diff) \ + do { \ + me->height -= diff; \ + prev->height += diff; \ + me->first_row += diff; \ + window_adjust_pagetop (prev); \ + } while (0) + +/* Change the height of WINDOW by AMOUNT. This also automagically adjusts + the previous and next windows in the chain. If there is only one user + window, then no change takes place. */ +void +window_change_window_height (window, amount) + WINDOW *window; + int amount; +{ + register WINDOW *win, *prev, *next; + + /* If there is only one window, or if the amount of change is zero, + return immediately. */ + if (!windows->next || amount == 0) + return; + + /* Find this window in our chain. */ + for (win = windows; win; win = win->next) + if (win == window) + break; + + /* If the window is isolated (i.e., doesn't appear in our window list, + then quit now. */ + if (!win) + return; + + /* Change the height of this window by AMOUNT, if that is possible. + It can be impossible if there isn't enough available room on the + screen, or if the resultant window would be too small. */ + + prev = window->prev; + next = window->next; + + /* WINDOW decreasing in size? */ + if (amount < 0) + { + int abs_amount = -amount; /* It is easier to deal with this way. */ + + /* If the resultant window would be too small, stop here. */ + if ((window->height - abs_amount) < WINDOW_MIN_HEIGHT) + return; + + /* If we have two neighboring windows, choose the smaller one to get + larger. */ + if (next && prev) + { + if (prev->height < next->height) + shrink_me_growing_prev (window, prev, abs_amount); + else + shrink_me_growing_next (window, next, abs_amount); + } + else if (next) + shrink_me_growing_next (window, next, abs_amount); + else + shrink_me_growing_prev (window, prev, abs_amount); + } + + /* WINDOW increasing in size? */ + if (amount > 0) + { + int total_avail, next_avail = 0, prev_avail = 0; + + if (next) + next_avail = next->height - WINDOW_MIN_SIZE; + + if (prev) + prev_avail = prev->height - WINDOW_MIN_SIZE; + + total_avail = next_avail + prev_avail; + + /* If there isn't enough space available to grow this window, give up. */ + if (amount > total_avail) + return; + + /* If there aren't two neighboring windows, or if one of the neighbors + is larger than the other one by at least AMOUNT, grow that one. */ + if ((next && !prev) || ((next_avail - amount) >= prev_avail)) + grow_me_shrinking_next (window, next, amount); + else if ((prev && !next) || ((prev_avail - amount) >= next_avail)) + grow_me_shrinking_prev (window, prev, amount); + else + { + int change; + + /* This window has two neighbors. They both must be shrunk in to + make enough space for WINDOW to grow. Make them both the same + size. */ + if (prev_avail > next_avail) + { + change = prev_avail - next_avail; + grow_me_shrinking_prev (window, prev, change); + amount -= change; + } + else + { + change = next_avail - prev_avail; + grow_me_shrinking_next (window, next, change); + amount -= change; + } + + /* Both neighbors are the same size. Split the difference in + AMOUNT between them. */ + while (amount) + { + window->height++; + amount--; + + /* Odd numbers grow next, even grow prev. */ + if (amount & 1) + { + prev->height--; + window->first_row--; + } + else + { + next->height--; + next->first_row++; + } + } + window_adjust_pagetop (prev); + window_adjust_pagetop (next); + } + } + if (prev) + prev->flags |= W_UpdateWindow; + + if (next) + next->flags |= W_UpdateWindow; + + window->flags |= W_UpdateWindow; + window_adjust_pagetop (window); +} + +/* Tile all of the windows currently displayed in the global variable + WINDOWS. If argument STYLE is TILE_INTERNALS, tile windows displaying + internal nodes as well, otherwise do not change the height of such + windows. */ +void +window_tile_windows (style) + int style; +{ + WINDOW *win, *last_adjusted; + int numwins, avail, per_win_height, leftover; + int do_internals; + + numwins = avail = 0; + do_internals = (style == TILE_INTERNALS); + + for (win = windows; win; win = win->next) + if (do_internals || !win->node || + (win->node->flags & N_IsInternal) == 0) + { + avail += win->height; + numwins++; + } + + if (numwins <= 1 || !the_screen->height) + return; + + /* Find the size for each window. Divide the size of the usable portion + of the screen by the number of windows. */ + per_win_height = avail / numwins; + leftover = avail - (per_win_height * numwins); + + last_adjusted = (WINDOW *)NULL; + for (win = windows; win; win = win->next) + { + if (do_internals || !win->node || + (win->node->flags & N_IsInternal) == 0) + { + last_adjusted = win; + win->height = per_win_height; + } + } + + if (last_adjusted) + last_adjusted->height += leftover; + + /* Readjust the first_row of every window in the chain. */ + for (win = windows; win; win = win->next) + { + if (win->prev) + win->first_row = win->prev->first_row + win->prev->height + 1; + + window_adjust_pagetop (win); + win->flags |= W_UpdateWindow; + } +} + +/* Toggle the state of line wrapping in WINDOW. This can do a bit of fancy + redisplay. */ +void +window_toggle_wrap (window) + WINDOW *window; +{ + if (window->flags & W_NoWrap) + window->flags &= ~W_NoWrap; + else + window->flags |= W_NoWrap; + + if (window != the_echo_area) + { + char **old_starts; + int old_lines, old_pagetop; + + old_starts = window->line_starts; + old_lines = window->line_count; + old_pagetop = window->pagetop; + + calculate_line_starts (window); + + /* Make sure that point appears within this window. */ + window_adjust_pagetop (window); + + /* If the pagetop hasn't changed maybe we can do some scrolling now + to speed up the display. Many of the line starts will be the same, + so scrolling here is a very good optimization.*/ + if (old_pagetop == window->pagetop) + display_scroll_line_starts + (window, old_pagetop, old_starts, old_lines); + maybe_free (old_starts); + } + window->flags |= W_UpdateWindow; +} + +/* Set WINDOW to display NODE. */ +void +window_set_node_of_window (window, node) + WINDOW *window; + NODE *node; +{ + window->node = node; + window->pagetop = 0; + window->point = 0; + recalculate_line_starts (window); + window->flags |= W_UpdateWindow; + window_adjust_pagetop (window); + window_make_modeline (window); +} + +/* Delete WINDOW from the list of known windows. If this window was the + active window, make the next window in the chain be the active window. + If the active window is the next or previous window, choose that window + as the recipient of the extra space. Otherwise, prefer the next window. */ +void +window_delete_window (window) + WINDOW *window; +{ + WINDOW *next, *prev, *window_to_fix; + + next = window->next; + prev = window->prev; + + /* You cannot delete the only window or a permanent window. */ + if ((!next && !prev) || (window->flags & W_WindowIsPerm)) + return; + + if (next) + next->prev = prev; + + if (!prev) + windows = next; + else + prev->next = next; + + if (window->line_starts) + free (window->line_starts); + + if (window->modeline) + free (window->modeline); + + if (window == active_window) + { + /* If there isn't a next window, then there must be a previous one, + since we cannot delete the last window. If there is a next window, + prefer to use that as the active window. */ + if (next) + active_window = next; + else + active_window = prev; + } + + if (next && active_window == next) + window_to_fix = next; + else if (prev && active_window == prev) + window_to_fix = prev; + else if (next) + window_to_fix = next; + else if (prev) + window_to_fix = prev; + else + window_to_fix = windows; + + if (window_to_fix->first_row > window->first_row) + { + int diff; + + /* Try to adjust the visible part of the node so that as little + text as possible has to move. */ + diff = window_to_fix->first_row - window->first_row; + window_to_fix->first_row = window->first_row; + + window_to_fix->pagetop -= diff; + if (window_to_fix->pagetop < 0) + window_to_fix->pagetop = 0; + } + + /* The `+ 1' is to offset the difference between the first_row locations. + See the code in window_make_window (). */ + window_to_fix->height += window->height + 1; + window_to_fix->flags |= W_UpdateWindow; + + free (window); +} + +/* For every window in CHAIN, set the flags member to have FLAG set. */ +void +window_mark_chain (chain, flag) + WINDOW *chain; + int flag; +{ + register WINDOW *win; + + for (win = chain; win; win = win->next) + win->flags |= flag; +} + +/* For every window in CHAIN, clear the flags member of FLAG. */ +void +window_unmark_chain (chain, flag) + WINDOW *chain; + int flag; +{ + register WINDOW *win; + + for (win = chain; win; win = win->next) + win->flags &= ~flag; +} + +/* Return the number of characters it takes to display CHARACTER on the + screen at HPOS. */ +int +character_width (character, hpos) + int character, hpos; +{ + int printable_limit = 127; + int width = 1; + + if (ISO_Latin_p) + printable_limit = 160; + + if (character > printable_limit) + width = 3; + else if (iscntrl (character)) + { + switch (character) + { + case '\r': + case '\n': + width = the_screen->width - hpos; + break; + case '\t': + width = ((hpos + 8) & 0xf8) - hpos; + break; + default: + width = 2; + } + } + else if (character == DEL) + width = 2; + + return (width); +} + +/* Return the number of characters it takes to display STRING on the screen + at HPOS. */ +int +string_width (string, hpos) + char *string; + int hpos; +{ + register int i, width, this_char_width; + + for (width = 0, i = 0; string[i]; i++) + { + this_char_width = character_width (string[i], hpos); + width += this_char_width; + hpos += this_char_width; + } + return (width); +} + +/* Quickly guess the approximate number of lines to that NODE would + take to display. This really only counts carriage returns. */ +int +window_physical_lines (node) + NODE *node; +{ + register int i, lines; + char *contents; + + if (!node) + return (0); + + contents = node->contents; + for (i = 0, lines = 1; i < node->nodelen; i++) + if (contents[i] == '\n') + lines++; + + return (lines); +} + +/* Calculate a list of line starts for the node belonging to WINDOW. The line + starts are pointers to the actual text within WINDOW->NODE. */ +void +calculate_line_starts (window) + WINDOW *window; +{ + register int i, hpos; + char **line_starts = (char **)NULL; + int line_starts_index = 0, line_starts_slots = 0; + int bump_index; + NODE *node; + + window->line_starts = (char **)NULL; + window->line_count = 0; + node = window->node; + + if (!node) + return; + + /* Grovel the node starting at the top, and for each line calculate the + width of the characters appearing in that line. Add each line start + to our array. */ + i = 0; + hpos = 0; + bump_index = 0; + + while (i < node->nodelen) + { + char *line = node->contents + i; + unsigned int cwidth, c; + + add_pointer_to_array (line, line_starts_index, line_starts, + line_starts_slots, 100, char *); + if (bump_index) + { + i++; + bump_index = 0; + } + + while (1) + { + c = node->contents[i]; + cwidth = character_width (c, hpos); + + /* If this character fits within this line, just do the next one. */ + if ((hpos + cwidth) < window->width) + { + i++; + hpos += cwidth; + continue; + } + else + { + /* If this character would position the cursor at the start of + the next printed screen line, then do the next line. */ + if (c == '\n' || c == '\r' || c == '\t') + { + i++; + hpos = 0; + break; + } + else + { + /* This character passes the window width border. Postion + the cursor after the printed character, but remember this + line start as where this character is. A bit tricky. */ + + /* If this window doesn't wrap lines, proceed to the next + physical line here. */ + if (window->flags & W_NoWrap) + { + hpos = 0; + while (i < node->nodelen && node->contents[i] != '\n') + i++; + + if (node->contents[i] == '\n') + i++; + } + else + { + hpos = the_screen->width - hpos; + bump_index++; + } + break; + } + } + } + } + window->line_starts = line_starts; + window->line_count = line_starts_index; +} + +/* Given WINDOW, recalculate the line starts for the node it displays. */ +void +recalculate_line_starts (window) + WINDOW *window; +{ + maybe_free (window->line_starts); + calculate_line_starts (window); +} + +/* Global variable control redisplay of scrolled windows. If non-zero, it + is the desired number of lines to scroll the window in order to make + point visible. A user might set this to 1 for smooth scrolling. If + set to zero, the line containing point is centered within the window. */ +int window_scroll_step = 0; + +/* Adjust the pagetop of WINDOW such that the cursor point will be visible. */ +void +window_adjust_pagetop (window) + WINDOW *window; +{ + register int line = 0; + char *contents; + + if (!window->node) + return; + + contents = window->node->contents; + + /* Find the first printed line start which is after WINDOW->point. */ + for (line = 0; line < window->line_count; line++) + { + char *line_start; + + line_start = window->line_starts[line]; + + if ((line_start - contents) > window->point) + break; + } + + /* The line index preceding the line start which is past point is the + one containing point. */ + line--; + + /* If this line appears in the current displayable page, do nothing. + Otherwise, adjust the top of the page to make this line visible. */ + if ((line < window->pagetop) || + (line - window->pagetop > (window->height - 1))) + { + /* The user-settable variable "scroll-step" is used to attempt + to make point visible, iff it is non-zero. If that variable + is zero, then the line containing point is centered within + the window. */ + if (window_scroll_step < window->height) + { + if ((line < window->pagetop) && + ((window->pagetop - window_scroll_step) <= line)) + window->pagetop -= window_scroll_step; + else if ((line - window->pagetop > (window->height - 1)) && + ((line - (window->pagetop + window_scroll_step) + < window->height))) + window->pagetop += window_scroll_step; + else + window->pagetop = line - ((window->height - 1) / 2); + } + else + window->pagetop = line - ((window->height - 1) / 2); + + if (window->pagetop < 0) + window->pagetop = 0; + window->flags |= W_UpdateWindow; + } +} + +/* Return the index of the line containing point. */ +int +window_line_of_point (window) + WINDOW *window; +{ + register int i, start = 0; + + /* Try to optimize. Check to see if point is past the pagetop for + this window, and if so, start searching forward from there. */ + if ((window->pagetop > -1 && window->pagetop < window->line_count) && + (window->line_starts[window->pagetop] - window->node->contents) + <= window->point) + start = window->pagetop; + + for (i = start; i < window->line_count; i++) + { + if ((window->line_starts[i] - window->node->contents) > window->point) + break; + } + + return (i - 1); +} + +/* Get and return the goal column for this window. */ +int +window_get_goal_column (window) + WINDOW *window; +{ + if (!window->node) + return (-1); + + if (window->goal_column != -1) + return (window->goal_column); + + /* Okay, do the work. Find the printed offset of the cursor + in this window. */ + return (window_get_cursor_column (window)); +} + +/* Get and return the printed column offset of the cursor in this window. */ +int +window_get_cursor_column (window) + WINDOW *window; +{ + int i, hpos, end; + char *line; + + i = window_line_of_point (window); + + if (i < 0) + return (-1); + + line = window->line_starts[i]; + end = window->point - (line - window->node->contents); + + for (hpos = 0, i = 0; i < end; i++) + hpos += character_width (line[i], hpos); + + return (hpos); +} + +/* Count the number of characters in LINE that precede the printed column + offset of GOAL. */ +int +window_chars_to_goal (line, goal) + char *line; + int goal; +{ + register int i, check, hpos; + + for (hpos = 0, i = 0; line[i] != '\n'; i++) + { + + check = hpos + character_width (line[i], hpos); + + if (check > goal) + break; + + hpos = check; + } + return (i); +} + +/* Create a modeline for WINDOW, and store it in window->modeline. */ +void +window_make_modeline (window) + WINDOW *window; +{ + register int i; + char *modeline; + char location_indicator[4]; + int lines_remaining; + + /* Only make modelines for those windows which have one. */ + if (window->flags & W_InhibitMode) + return; + + /* Find the number of lines actually displayed in this window. */ + lines_remaining = window->line_count - window->pagetop; + + if (window->pagetop == 0) + { + if (lines_remaining <= window->height) + strcpy (location_indicator, "All"); + else + strcpy (location_indicator, "Top"); + } + else + { + if (lines_remaining <= window->height) + strcpy (location_indicator, "Bot"); + else + { + float pt, lc; + int percentage; + + pt = (float)window->pagetop; + lc = (float)window->line_count; + + percentage = 100 * (pt / lc); + + sprintf (location_indicator, "%2d%%", percentage); + } + } + + /* Calculate the maximum size of the information to stick in MODELINE. */ + { + int modeline_len = 0; + char *parent = (char *)NULL, *filename = "*no file*"; + char *nodename = "*no node*"; + char *update_message = (char *)NULL; + NODE *node = window->node; + + if (node) + { + if (node->nodename) + nodename = node->nodename; + + if (node->parent) + { + parent = filename_non_directory (node->parent); + modeline_len += strlen ("Subfile: ") + strlen (node->filename); + } + + if (node->filename) + filename = filename_non_directory (node->filename); + + if (node->flags & N_UpdateTags) + update_message = "--*** Tags out of Date ***"; + } + + if (update_message) + modeline_len += strlen (update_message); + modeline_len += strlen (filename); + modeline_len += strlen (nodename); + modeline_len += 4; /* strlen (location_indicator). */ + + /* 10 for the decimal representation of the number of lines in this + node, and the remainder of the text that can appear in the line. */ + modeline_len += 10 + strlen ("-----Info: (), lines ----, "); + modeline_len += window->width; + + modeline = (char *)xmalloc (1 + modeline_len); + + /* Special internal windows have no filename. */ + if (!parent && !*filename) + sprintf (modeline, "-%s---Info: %s, %d lines --%s--", + (window->flags & W_NoWrap) ? "$" : "-", + nodename, window->line_count, location_indicator); + else + sprintf (modeline, "-%s%s-Info: (%s)%s, %d lines --%s--", + (window->flags & W_NoWrap) ? "$" : "-", + (node && (node->flags & N_IsCompressed)) ? "zz" : "--", + parent ? parent : filename, + nodename, window->line_count, location_indicator); + + if (parent) + sprintf (modeline + strlen (modeline), " Subfile: %s", filename); + + if (update_message) + sprintf (modeline + strlen (modeline), "%s", update_message); + + i = strlen (modeline); + + if (i >= window->width) + modeline[window->width] = '\0'; + else + { + while (i < window->width) + modeline[i++] = '-'; + modeline[i] = '\0'; + } + + strcpy (window->modeline, modeline); + free (modeline); + } +} + +/* Make WINDOW start displaying at PERCENT percentage of its node. */ +void +window_goto_percentage (window, percent) + WINDOW *window; + int percent; +{ + int desired_line; + + if (!percent) + desired_line = 0; + else + desired_line = + (int) ((float)window->line_count * ((float)percent / 100.0)); + + window->pagetop = desired_line; + window->point = + window->line_starts[window->pagetop] - window->node->contents; + window->flags |= W_UpdateWindow; + window_make_modeline (window); +} + +/* Get the state of WINDOW, and save it in STATE. */ +void +window_get_state (window, state) + WINDOW *window; + WINDOW_STATE *state; +{ + state->node = window->node; + state->pagetop = window->pagetop; + state->point = window->point; +} + +/* Set the node, pagetop, and point of WINDOW. */ +void +window_set_state (window, state) + WINDOW *window; + WINDOW_STATE *state; +{ + if (window->node != state->node) + window_set_node_of_window (window, state->node); + window->pagetop = state->pagetop; + window->point = state->point; +} + + +/* **************************************************************** */ +/* */ +/* Manipulating Home-Made Nodes */ +/* */ +/* **************************************************************** */ + +/* A place to buffer echo area messages. */ +static NODE *echo_area_node = (NODE *)NULL; + +/* Make the node of the_echo_area be an empty one. */ +static void +free_echo_area () +{ + if (echo_area_node) + { + maybe_free (echo_area_node->contents); + free (echo_area_node); + } + + echo_area_node = (NODE *)NULL; + window_set_node_of_window (the_echo_area, echo_area_node); +} + +/* Clear the echo area, removing any message that is already present. + The echo area is cleared immediately. */ +void +window_clear_echo_area () +{ + free_echo_area (); + display_update_one_window (the_echo_area); +} + +/* Make a message appear in the echo area, built from FORMAT, ARG1 and ARG2. + The arguments are treated similar to printf () arguments, but not all of + printf () hair is present. The message appears immediately. If there was + already a message appearing in the echo area, it is removed. */ +void +window_message_in_echo_area (format, arg1, arg2) + char *format; + void *arg1, *arg2; +{ + free_echo_area (); + echo_area_node = build_message_node (format, arg1, arg2); + window_set_node_of_window (the_echo_area, echo_area_node); + display_update_one_window (the_echo_area); +} + +/* Place a temporary message in the echo area built from FORMAT, ARG1 + and ARG2. The message appears immediately, but does not destroy + any existing message. A future call to unmessage_in_echo_area () + restores the old contents. */ +static NODE **old_echo_area_nodes = (NODE **)NULL; +static int old_echo_area_nodes_index = 0; +static int old_echo_area_nodes_slots = 0; + +void +message_in_echo_area (format, arg1, arg2) + char *format; + void *arg1, *arg2; +{ + if (echo_area_node) + { + add_pointer_to_array (echo_area_node, old_echo_area_nodes_index, + old_echo_area_nodes, old_echo_area_nodes_slots, + 4, NODE *); + } + echo_area_node = (NODE *)NULL; + window_message_in_echo_area (format, arg1, arg2); +} + +void +unmessage_in_echo_area () +{ + free_echo_area (); + + if (old_echo_area_nodes_index) + echo_area_node = old_echo_area_nodes[--old_echo_area_nodes_index]; + + window_set_node_of_window (the_echo_area, echo_area_node); + display_update_one_window (the_echo_area); +} + +/* A place to build a message. */ +static char *message_buffer = (char *)NULL; +static int message_buffer_index = 0; +static int message_buffer_size = 0; + +/* Ensure that there is enough space to stuff LENGTH characters into + MESSAGE_BUFFER. */ +static void +message_buffer_resize (length) + int length; +{ + if (!message_buffer) + { + message_buffer_size = length + 1; + message_buffer = (char *)xmalloc (message_buffer_size); + message_buffer_index = 0; + } + + while (message_buffer_size <= message_buffer_index + length) + message_buffer = (char *) + xrealloc (message_buffer, + message_buffer_size += 100 + (2 * length)); +} + +/* Format MESSAGE_BUFFER with the results of printing FORMAT with ARG1 and + ARG2. */ +static void +build_message_buffer (format, arg1, arg2) + char *format; + void *arg1, *arg2; +{ + register int i, len; + void *args[2]; + int arg_index = 0; + + args[0] = arg1; + args[1] = arg2; + + len = strlen (format); + + message_buffer_resize (len); + + for (i = 0; format[i]; i++) + { + if (format[i] != '%') + { + message_buffer[message_buffer_index++] = format[i]; + len--; + } + else + { + char c; + + c = format[++i]; + + switch (c) + { + case '%': /* Insert a percent sign. */ + message_buffer_resize (len + 1); + message_buffer[message_buffer_index++] = '%'; + break; + + case 's': /* Insert the current arg as a string. */ + { + char *string; + int string_len; + + string = (char *)args[arg_index++]; + string_len = strlen (string); + + message_buffer_resize (len + string_len); + sprintf + (message_buffer + message_buffer_index, "%s", string); + message_buffer_index += string_len; + } + break; + + case 'd': /* Insert the current arg as an integer. */ + { + long long_val; + int integer; + + long_val = (long)args[arg_index++]; + integer = (int)long_val; + + message_buffer_resize (len + 32); + sprintf + (message_buffer + message_buffer_index, "%d", integer); + message_buffer_index = strlen (message_buffer); + } + break; + + case 'c': /* Insert the current arg as a character. */ + { + long long_val; + int character; + + long_val = (long)args[arg_index++]; + character = (int)long_val; + + message_buffer_resize (len + 1); + message_buffer[message_buffer_index++] = character; + } + break; + + default: + abort (); + } + } + } + message_buffer[message_buffer_index] = '\0'; +} + +/* Build a new node which has FORMAT printed with ARG1 and ARG2 as the + contents. */ +NODE * +build_message_node (format, arg1, arg2) + char *format; + void *arg1, *arg2; +{ + NODE *node; + + message_buffer_index = 0; + build_message_buffer (format, arg1, arg2); + + node = message_buffer_to_node (); + return (node); +} + +/* Convert the contents of the message buffer to a node. */ +NODE * +message_buffer_to_node () +{ + NODE *node; + + node = (NODE *)xmalloc (sizeof (NODE)); + node->filename = (char *)NULL; + node->parent = (char *)NULL; + node->nodename = (char *)NULL; + node->flags = 0; + + /* Make sure that this buffer ends with a newline. */ + node->nodelen = 1 + strlen (message_buffer); + node->contents = (char *)xmalloc (1 + node->nodelen); + strcpy (node->contents, message_buffer); + node->contents[node->nodelen - 1] = '\n'; + node->contents[node->nodelen] = '\0'; + return (node); +} + +/* Useful functions can be called from outside of window.c. */ +void +initialize_message_buffer () +{ + message_buffer_index = 0; +} + +/* Print FORMAT with ARG1,2 to the end of the current message buffer. */ +void +printf_to_message_buffer (format, arg1, arg2) + char *format; + void *arg1, *arg2; +{ + build_message_buffer (format, arg1, arg2); +} + +/* Return the current horizontal position of the "cursor" on the most + recently output message buffer line. */ +int +message_buffer_length_this_line () +{ + register int i; + + if (!message_buffer_index) + return (0); + + for (i = message_buffer_index; i && message_buffer[i - 1] != '\n'; i--); + + return (string_width (message_buffer + i, 0)); +} + +/* Pad STRING to COUNT characters by inserting blanks. */ +int +pad_to (count, string) + int count; + char *string; +{ + register int i; + + i = strlen (string); + + if (i >= count) + string[i++] = ' '; + else + { + while (i < count) + string[i++] = ' '; + } + string[i] = '\0'; + + return (i); +}
new file mode 100644 --- /dev/null +++ b/info/window.h @@ -0,0 +1,229 @@ +/* window.h -- Structure and flags used in manipulating Info windows. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (_WINDOW_H_) +#define _WINDOW_H_ + +#include "nodes.h" +#include "infomap.h" + +/* Smallest number of visible lines in a window. The actual height is + always one more than this number because each window has a modeline. */ +#define WINDOW_MIN_HEIGHT 2 + +/* Smallest number of screen lines that can be used to fully present a + window. This number includes the modeline of the window. */ +#define WINDOW_MIN_SIZE (WINDOW_MIN_HEIGHT + 1) + +/* The exact same elements are used within the WINDOW_STATE structure and a + subsection of the WINDOW structure. We could define a structure which + contains this elements, and include that structure in each of WINDOW_STATE + and WINDOW. But that would lead references in the code such as + window->state->node which we would like to avoid. Instead, we #define the + elements here, and simply include the define in both data structures. Thus, + if you need to change window state information, here is where you would + do it. NB> The last element does NOT end with a semi-colon. */ +#define WINDOW_STATE_DECL \ + NODE *node; /* The node displayed in this window. */ \ + int pagetop; /* LINE_STARTS[PAGETOP] is first line in WINDOW. */ \ + long point /* Offset within NODE of the cursor position. */ + +/* Structure which defines a window. Windows are doubly linked, next + and prev. The list of windows is kept on WINDOWS. The structure member + window->height is the total height of the window. The position location + (0, window->height + window->first_row) is the first character of this + windows modeline. The number of lines that can be displayed in a window + is equal to window->height - 1. */ +typedef struct __window__ { + struct __window__ *next; /* Next window in this chain. */ + struct __window__ *prev; /* Previous window in this chain. */ + int width; /* Width of this window. */ + int height; /* Height of this window. */ + int first_row; /* Offset of the first line in the_screen. */ + int goal_column; /* The column we would like the cursor to appear in. */ + Keymap keymap; /* Keymap used to read commands in this window. */ + WINDOW_STATE_DECL; /* Node, pagetop and point. */ + char *modeline; /* Calculated text of the modeline for this window. */ + char **line_starts; /* Array of printed line starts for this node. */ + int line_count; /* Number of lines appearing in LINE_STARTS. */ + int flags; /* See below for details. */ +} WINDOW; + +typedef struct { + WINDOW_STATE_DECL; /* What gets saved. */ +} WINDOW_STATE; + +#define W_UpdateWindow 0x01 /* WINDOW needs updating. */ +#define W_WindowIsPerm 0x02 /* This WINDOW is a permanent object. */ +#define W_WindowVisible 0x04 /* This WINDOW is currently visible. */ +#define W_InhibitMode 0x08 /* This WINDOW has no modeline. */ +#define W_NoWrap 0x10 /* Lines do not wrap in this window. */ +#define W_InputWindow 0x20 /* Window accepts input. */ +#define W_TempWindow 0x40 /* Window is less important. */ + +extern WINDOW *windows; /* List of visible Info windows. */ +extern WINDOW *active_window; /* The currently active window. */ +extern WINDOW *the_screen; /* The Info screen is just another window. */ +extern WINDOW *the_echo_area; /* THE_ECHO_AREA is a window in THE_SCREEN. */ + +/* Global variable control redisplay of scrolled windows. If non-zero, it + is the desired number of lines to scroll the window in order to make + point visible. A user might set this to 1 for smooth scrolling. If + set to zero, the line containing point is centered within the window. */ +extern int window_scroll_step; + + /* Make the modeline member for WINDOW. */ +extern void window_make_modeline (); + +/* Initalize the window system by creating THE_SCREEN and THE_ECHO_AREA. + Create the first window ever, and make it permanent. + You pass WIDTH and HEIGHT; the dimensions of the total screen size. */ +extern void window_initialize_windows (); + +/* Make a new window showing NODE, and return that window structure. + The new window is made to be the active window. If NODE is passed + as NULL, then show the node showing in the active window. If the + window could not be made return a NULL pointer. The active window + is not changed.*/ +extern WINDOW *window_make_window (); + +/* Delete WINDOW from the list of known windows. If this window was the + active window, make the next window in the chain be the active window, + or the previous window in the chain if there is no next window. */ +extern void window_delete_window (); + +/* A function to call when the screen changes size, and some windows have + to get deleted. The function is called with the window to be deleted + as an argument, and it can't do anything about the window getting deleted; + it can only clean up dangling references to that window. */ +extern VFunction *window_deletion_notifier; + +/* Set WINDOW to display NODE. */ +extern void window_set_node_of_window (); + +/* Tell the window system that the size of the screen has changed. This + causes lots of interesting things to happen. The permanent windows + are resized, as well as every visible window. You pass WIDTH and HEIGHT; + the dimensions of the total screen size. */ +extern void window_new_screen_size (); + +/* Change the height of WINDOW by AMOUNT. This also automagically adjusts + the previous and next windows in the chain. If there is only one user + window, then no change takes place. */ +extern void window_change_window_height (); + +/* Adjust the pagetop of WINDOW such that the cursor point will be visible. */ +extern void window_adjust_pagetop (); + +/* Tile all of the windows currently displayed in the global variable + WINDOWS. If argument DO_INTERNALS is non-zero, tile windows displaying + internal nodes as well. */ +#define DONT_TILE_INTERNALS 0 +#define TILE_INTERNALS 1 +extern void window_tile_windows (); + +/* Toggle the state of line wrapping in WINDOW. This can do a bit of fancy + redisplay. */ +extern void window_toggle_wrap (); + +/* For every window in CHAIN, set the flags member to have FLAG set. */ +extern void window_mark_chain (); + +/* For every window in CHAIN, clear the flags member of FLAG. */ +extern void window_unmark_chain (); + +/* Make WINDOW start displaying at PERCENT percentage of its node. */ +extern void window_goto_percentage (); + +/* Build a new node which has FORMAT printed with ARG1 and ARG2 as the + contents. */ +extern NODE *build_message_node (); + +/* Useful functions can be called from outside of window.c. */ +extern void initialize_message_buffer (); + +/* Print FORMAT with ARG1,2 to the end of the current message buffer. */ +extern void printf_to_message_buffer (); + +/* Convert the contents of the message buffer to a node. */ +extern NODE *message_buffer_to_node (); + +/* Return the length of the most recently printed line in message buffer. */ +extern int message_buffer_length_this_line (); + +/* Pad STRING to COUNT characters by inserting blanks. */ +extern int pad_to (); + +/* Make a message appear in the echo area, built from FORMAT, ARG1 and ARG2. + The arguments are treated similar to printf () arguments, but not all of + printf () hair is present. The message appears immediately. If there was + already a message appearing in the echo area, it is removed. */ +extern void window_message_in_echo_area (); + +/* Place a temporary message in the echo area built from FORMAT, ARG1 + and ARG2. The message appears immediately, but does not destroy + any existing message. A future call to unmessage_in_echo_area () + restores the old contents. */ +extern void message_in_echo_area (); +extern void unmessage_in_echo_area (); + +/* Clear the echo area, removing any message that is already present. + The echo area is cleared immediately. */ +extern void window_clear_echo_area (); + +/* Quickly guess the approximate number of lines to that NODE would + take to display. This really only counts carriage returns. */ +extern int window_physical_lines (); + +/* Calculate a list of line starts for the node belonging to WINDOW. The line + starts are pointers to the actual text within WINDOW->NODE. */ +extern void calculate_line_starts (); + +/* Given WINDOW, recalculate the line starts for the node it displays. */ +extern void recalculate_line_starts (); + +/* Return the number of characters it takes to display CHARACTER on the + screen at HPOS. */ +extern int character_width (); + +/* Return the number of characters it takes to display STRING on the + screen at HPOS. */ +extern int string_width (); + +/* Return the index of the line containing point. */ +extern int window_line_of_point (); + +/* Get and return the goal column for this window. */ +extern int window_get_goal_column (); + +/* Get and return the printed column offset of the cursor in this window. */ +extern int window_get_cursor_column (); + +/* Get and Set the node, pagetop, and point of WINDOW. */ +extern void window_get_state (), window_set_state (); + +/* Count the number of characters in LINE that precede the printed column + offset of GOAL. */ +extern int window_chars_to_goal (); + +#endif /* !_WINDOW_H_ */
new file mode 100644 --- /dev/null +++ b/info/xmalloc.c @@ -0,0 +1,80 @@ +/* xmalloc.c -- safe versions of malloc and realloc */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + This file has appeared in prior works by the Free Software Foundation; + thus it carries copyright dates from 1988 through 1993. + + Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993 Free Software + Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#if !defined (ALREADY_HAVE_XMALLOC) +#include <stdio.h> +#include <sys/types.h> + +extern void *malloc (), *realloc (); +static void memory_error_and_abort (); + +/* **************************************************************** */ +/* */ +/* Memory Allocation and Deallocation. */ +/* */ +/* **************************************************************** */ + +/* Return a pointer to free()able block of memory large enough + to hold BYTES number of bytes. If the memory cannot be allocated, + print an error message and abort. */ +void * +xmalloc (bytes) + int bytes; +{ + void *temp = malloc (bytes); + + if (!temp) + memory_error_and_abort ("xmalloc"); + return (temp); +} + +void * +xrealloc (pointer, bytes) + void *pointer; + int bytes; +{ + void *temp; + + if (!pointer) + temp = malloc (bytes); + else + temp = realloc (pointer, bytes); + + if (!temp) + memory_error_and_abort ("xrealloc"); + + return (temp); +} + +static void +memory_error_and_abort (fname) + char *fname; +{ + fprintf (stderr, "%s: Out of virtual memory!\n", fname); + abort (); +} +#endif /* !ALREADY_HAVE_XMALLOC */