octave-lyh: readline/display.c comparison

comparison readline/display.c @ 2996:9d4e3a9de17e

[project @ 1997-05-22 20:58:07 by jwe]

author	jwe
date	Thu, 22 May 1997 20:59:27 +0000
parents
children	f7e4a95916f2

comparison

equal deleted inserted replaced

-:953ce4558485
+:9d4e3a9de17e
+/* display.c -- readline redisplay facility. */
+/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
+This file is part of the GNU Readline Library, a library for
+reading lines of text with interactive input and history editing.
+The GNU Readline Library 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 1, or
+(at your option) any later version.
+The GNU Readline Library 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.
+The GNU General Public License is often shipped with GNU software, and
+is generally kept in a file called COPYING or LICENSE.  If you do not
+have a copy of the license, write to the Free Software Foundation,
+675 Mass Ave, Cambridge, MA 02139, USA. */
+#define READLINE_LIBRARY
+#if defined (HAVE_CONFIG_H)
+#  include <config.h>
+#endif
+#include <sys/types.h>
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+#include "posixstat.h"
+#if defined (HAVE_STDLIB_H)
+#  include <stdlib.h>
+#else
+#  include "ansi_stdlib.h"
+#endif /* HAVE_STDLIB_H */
+#include <stdio.h>
+#if defined (__GO32__)
+#  include <go32.h>
+#  include <pc.h>
+#endif /* __GO32__ */
+/* System-specific feature definitions and include files. */
+#include "rldefs.h"
+/* Termcap library stuff. */
+#include "tcap.h"
+/* Some standard library routines. */
+#include "readline.h"
+#include "history.h"
+#if !defined (strchr) && !defined (__STDC__)
+extern char *strchr (), *strrchr ();
+#endif /* !strchr && !__STDC__ */
+/* Global and pseudo-global variables and functions
+imported from readline.c. */
+extern char *rl_prompt;
+extern int readline_echoing_p;
+extern int _rl_output_meta_chars;
+extern int _rl_horizontal_scroll_mode;
+extern int _rl_mark_modified_lines;
+extern int _rl_prefer_visible_bell;
+/* Variables and functions imported from terminal.c */
+extern void _rl_output_some_chars ();
+extern int _rl_output_character_function ();
+extern int _rl_backspace ();
+extern char *term_clreol, *term_clrpag;
+extern char *term_im, *term_ic,  *term_ei, *term_DC;
+extern char *term_up, *term_dc, *term_cr, *term_IC;
+extern int screenheight, screenwidth, screenchars;
+extern int terminal_can_insert, _rl_term_autowrap;
+/* Pseudo-global functions (local to the readline library) exported
+by this file. */
+void _rl_move_cursor_relative (), _rl_output_some_chars ();
+void _rl_move_vert ();
+void _rl_clear_to_eol (), _rl_clear_screen ();
+static void update_line (), space_to_eol ();
+static void delete_chars (), insert_some_chars ();
+static void cr ();
+static int *inv_lbreaks, *vis_lbreaks;
+extern char *xmalloc (), *xrealloc ();
+/* Heuristic used to decide whether it is faster to move from CUR to NEW
+by backing up or outputting a carriage return and moving forward. */
+#define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new)))
+/* **************************************************************** */
+/*								    */
+/*			Display stuff				    */
+/*								    */
+/* **************************************************************** */
+/* This is the stuff that is hard for me.  I never seem to write good
+display routines in C.  Let's see how I do this time. */
+/* (PWP) Well... Good for a simple line updater, but totally ignores
+the problems of input lines longer than the screen width.
+update_line and the code that calls it makes a multiple line,
+automatically wrapping line update.  Careful attention needs
+to be paid to the vertical position variables. */
+/* Keep two buffers; one which reflects the current contents of the
+screen, and the other to draw what we think the new contents should
+be.  Then compare the buffers, and make whatever changes to the
+screen itself that we should.  Finally, make the buffer that we
+just drew into be the one which reflects the current contents of the
+screen, and place the cursor where it belongs.
+Commands that want to can fix the display themselves, and then let
+this function know that the display has been fixed by setting the
+RL_DISPLAY_FIXED variable.  This is good for efficiency. */
+/* Application-specific redisplay function. */
+VFunction *rl_redisplay_function = rl_redisplay;
+/* Global variables declared here. */
+/* What YOU turn on when you have handled all redisplay yourself. */
+int rl_display_fixed = 0;
+int _rl_suppress_redisplay = 0;
+/* The stuff that gets printed out before the actual text of the line.
+This is usually pointing to rl_prompt. */
+char *rl_display_prompt = (char *)NULL;
+/* Pseudo-global variables declared here. */
+/* The visible cursor position.  If you print some text, adjust this. */
+int _rl_last_c_pos = 0;
+int _rl_last_v_pos = 0;
+/* Number of lines currently on screen minus 1. */
+int _rl_vis_botlin = 0;
+/* Variables used only in this file. */
+/* The last left edge of text that was displayed.  This is used when
+doing horizontal scrolling.  It shifts in thirds of a screenwidth. */
+static int last_lmargin;
+/* The line display buffers.  One is the line currently displayed on
+the screen.  The other is the line about to be displayed. */
+static char *visible_line = (char *)NULL;
+static char *invisible_line = (char *)NULL;
+/* A buffer for `modeline' messages. */
+static char msg_buf[128];
+/* Non-zero forces the redisplay even if we thought it was unnecessary. */
+static int forced_display;
+/* Default and initial buffer size.  Can grow. */
+static int line_size = 1024;
+static char *local_prompt, *local_prompt_prefix;
+static int visible_length, prefix_length;
+/* The number of invisible characters in the line currently being
+displayed on the screen. */
+static int visible_wrap_offset;
+/* static so it can be shared between rl_redisplay and update_line */
+static int wrap_offset;
+/* The index of the last invisible_character in the prompt string. */
+static int last_invisible;
+/* The length (buffer offset) of the first line of the last (possibly
+multi-line) buffer displayed on the screen. */
+static int visible_first_line_len;
+/* Expand the prompt string S and return the number of visible
+characters in *LP, if LP is not null.  This is currently more-or-less
+a placeholder for expansion.  LIP, if non-null is a place to store the
+index of the last invisible character in ther eturned string. */
+/* Current implementation:
+	\001 (^A) start non-visible characters
+	\002 (^B) end non-visible characters
+all characters except \001 and \002 (following a \001) are copied to
+the returned string; all characters except those between \001 and
+\002 are assumed to be `visible'. */
+static char *
+expand_prompt (pmt, lp, lip)
+char *pmt;
+int *lp, *lip;
+{
+char *r, *ret, *p;
+int l, rl, last, ignoring;
+/* Short-circuit if we can. */
+if (strchr (pmt, RL_PROMPT_START_IGNORE) == 0)
+{
+r = savestring (pmt);
+if (lp)
+	*lp = strlen (r);
+return r;
+}
+l = strlen (pmt);
+r = ret = xmalloc (l + 1);
+for (rl = ignoring = last = 0, p = pmt; p && *p; p++)
+{
+/* This code strips the invisible character string markers
+	 RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */
+if (*p == RL_PROMPT_START_IGNORE)
+	{
+	  ignoring++;
+	  continue;
+	}
+else if (ignoring && *p == RL_PROMPT_END_IGNORE)
+	{
+	  ignoring = 0;
+	  last = r - ret - 1;
+	  continue;
+	}
+else
+	{
+	  *r++ = *p;
+	  if (!ignoring)
+	    rl++;
+	}
+}
+*r = '\0';
+if (lp)
+*lp = rl;
+if (lip)
+*lip = last;
+return ret;
+}
+/*
+* Expand the prompt string into the various display components, if
+* necessary.
+*
+* local_prompt = expanded last line of string in rl_display_prompt
+*		  (portion after the final newline)
+* local_prompt_prefix = portion before last newline of rl_display_prompt,
+*			 expanded via expand_prompt
+* visible_length = number of visible characters in local_prompt
+* prefix_length = number of visible characters in local_prompt_prefix
+*
+* This function is called once per call to readline().  It may also be
+* called arbitrarily to expand the primary prompt.
+*
+* The return value is the number of visible characters on the last line
+* of the (possibly multi-line) prompt.
+*/
+int
+rl_expand_prompt (prompt)
+char *prompt;
+{
+char *p, *t;
+int c;
+/* Clear out any saved values. */
+if (local_prompt)
+free (local_prompt);
+if (local_prompt_prefix)
+free (local_prompt_prefix);
+local_prompt = local_prompt_prefix = (char *)0;
+last_invisible = 0;
+if (prompt == 0 || *prompt == 0)
+return (0);
+p = strrchr (prompt, '\n');
+if (!p)
+{
+/* The prompt is only one line. */
+local_prompt = expand_prompt (prompt, &visible_length, &last_invisible);
+local_prompt_prefix = (char *)0;
+return (visible_length);
+}
+else
+{
+/* The prompt spans multiple lines. */
+t = ++p;
+local_prompt = expand_prompt (p, &visible_length, &last_invisible);
+c = *t; *t = '\0';
+/* The portion of the prompt string up to and including the
+	 final newline is now null-terminated. */
+local_prompt_prefix = expand_prompt (prompt, &prefix_length, (int *)NULL);
+*t = c;
+return (prefix_length);
+}
+}
+/* Basic redisplay algorithm. */
+void
+rl_redisplay ()
+{
+register int in, out, c, linenum, cursor_linenum;
+register char *line;
+int c_pos, inv_botlin, lb_botlin, lb_linenum;
+int newlines, lpos, temp;
+char *prompt_this_line;
+if (!readline_echoing_p)
+return;
+if (!rl_display_prompt)
+rl_display_prompt = "";
+if (invisible_line == 0)
+{
+visible_line = xmalloc (line_size);
+invisible_line = xmalloc (line_size);
+for (in = 0; in < line_size; in++)
+	{
+	  visible_line[in] = 0;
+	  invisible_line[in] = 1;
+	}
+/* should be enough, but then again, this is just for testing. */
+inv_lbreaks = (int *)malloc (256 * sizeof (int));
+vis_lbreaks = (int *)malloc (256 * sizeof (int));
+inv_lbreaks[0] = vis_lbreaks[0] = 0;
+rl_on_new_line ();
+}
+/* Draw the line into the buffer. */
+c_pos = -1;
+line = invisible_line;
+out = inv_botlin = 0;
+/* Mark the line as modified or not.  We only do this for history
+lines. */
+if (_rl_mark_modified_lines && current_history () && rl_undo_list)
+{
+line[out++] = '*';
+line[out] = '\0';
+}
+/* If someone thought that the redisplay was handled, but the currently
+visible line has a different modification state than the one about
+to become visible, then correct the caller's misconception. */
+if (visible_line[0] != invisible_line[0])
+rl_display_fixed = 0;
+/* If the prompt to be displayed is the `primary' readline prompt (the
+one passed to readline()), use the values we have already expanded.
+If not, use what's already in rl_display_prompt.  WRAP_OFFSET is the
+number of non-visible characters in the prompt string. */
+if (rl_display_prompt == rl_prompt || local_prompt)
+{
+int local_len = local_prompt ? strlen (local_prompt) : 0;
+if (local_prompt_prefix && forced_display)
+	_rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix));
+if (local_len > 0)
+	{
+	  strncpy (line + out, local_prompt, local_len);
+	  out += local_len;
+	}
+line[out] = '\0';
+wrap_offset = local_len - visible_length;
+}
+else
+{
+int pmtlen;
+prompt_this_line = strrchr (rl_display_prompt, '\n');
+if (!prompt_this_line)
+	prompt_this_line = rl_display_prompt;
+else
+	{
+	  prompt_this_line++;
+	  if (forced_display)
+	    {
+	      _rl_output_some_chars (rl_display_prompt, prompt_this_line - rl_display_prompt);
+	      /* Make sure we are at column zero even after a newline,
+		 regardless of the state of terminal output processing. */
+	      if (prompt_this_line[-2] != '\r')
+		cr ();
+	    }
+	}
+pmtlen = strlen (prompt_this_line);
+strncpy (line + out,  prompt_this_line, pmtlen);
+out += pmtlen;
+line[out] = '\0';
+wrap_offset = 0;
+}
+#define CHECK_LPOS() \
+do { \
+lpos++; \
+if (lpos >= screenwidth) \
+{ \
+inv_lbreaks[++newlines] = out; \
+lpos = 0; \
+} \
+} while (0)
+/* inv_lbreaks[i] is where line i starts in the buffer. */
+inv_lbreaks[newlines = 0] = 0;
+lpos = out - wrap_offset;
+/* XXX - what if lpos is already >= screenwidth before we start drawing the
+contents of the command line? */
+while (lpos >= screenwidth)
+{
+temp = ((newlines + 1) * screenwidth) - ((newlines == 0) ? wrap_offset : 0);
+inv_lbreaks[++newlines] = temp;
+lpos -= screenwidth;
+}
+lb_linenum = 0;
+for (in = 0; in < rl_end; in++)
+{
+c = (unsigned char)rl_line_buffer[in];
+if (out + 8 >= line_size)		/* XXX - 8 for \t */
+	{
+	  line_size *= 2;
+	  visible_line = xrealloc (visible_line, line_size);
+	  invisible_line = xrealloc (invisible_line, line_size);
+	  line = invisible_line;
+	}
+if (in == rl_point)
+	{
+	  c_pos = out;
+	  lb_linenum = newlines;
+	}
+if (META_CHAR (c))
+	{
+	  if (_rl_output_meta_chars == 0)
+	    {
+	      sprintf (line + out, "\\%o", c);
+	      if (lpos + 4 >= screenwidth)
+		{
+		  temp = screenwidth - lpos;
+		  inv_lbreaks[++newlines] = out + temp;
+		  lpos = 4 - temp;
+		}
+	      else
+		lpos += 4;
+	      out += 4;
+	    }
+	  else
+	    {
+	      line[out++] = c;
+	      CHECK_LPOS();
+	    }
+	}
+#if defined (DISPLAY_TABS)
+else if (c == '\t')
+	{
+	  register int temp, newout;
+	  newout = (out | (int)7) + 1;
+	  temp = newout - out;
+	  if (lpos + temp >= screenwidth)
+	    {
+	      register int temp2;
+	      temp2 = screenwidth - lpos;
+	      inv_lbreaks[++newlines] = out + temp2;
+	      lpos = temp - temp2;
+	      while (out < newout)
+		line[out++] = ' ';
+	    }
+	  else
+	    {
+	      while (out < newout)
+		line[out++] = ' ';
+	      lpos += temp;
+	    }
+	}
+#endif
+else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && term_up && *term_up)
+{
+line[out++] = '\0';	/* XXX - sentinel */
+inv_lbreaks[++newlines] = out;
+lpos = 0;
+}
+else if (CTRL_CHAR (c) || c == RUBOUT)
+	{
+	  line[out++] = '^';
+	  CHECK_LPOS();
+	  line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?';
+	  CHECK_LPOS();
+	}
+else
+	{
+	  line[out++] = c;
+	  CHECK_LPOS();
+	}
+}
+line[out] = '\0';
+if (c_pos < 0)
+{
+c_pos = out;
+lb_linenum = newlines;
+}
+inv_botlin = lb_botlin = newlines;
+inv_lbreaks[newlines+1] = out;
+cursor_linenum = lb_linenum;
+/* C_POS == position in buffer where cursor should be placed. */
+/* PWP: now is when things get a bit hairy.  The visible and invisible
+line buffers are really multiple lines, which would wrap every
+(screenwidth - 1) characters.  Go through each in turn, finding
+the changed region and updating it.  The line order is top to bottom. */
+/* If we can move the cursor up and down, then use multiple lines,
+otherwise, let long lines display in a single terminal line, and
+horizontally scroll it. */
+if (_rl_horizontal_scroll_mode == 0 && term_up && *term_up)
+{
+int nleft, pos, changed_screen_line;
+if (!rl_display_fixed || forced_display)
+	{
+	  forced_display = 0;
+	  /* If we have more than a screenful of material to display, then
+	     only display a screenful.  We should display the last screen,
+	     not the first.  */
+	  if (out >= screenchars)
+	    out = screenchars - 1;
+	  /* The first line is at character position 0 in the buffer.  The
+	     second and subsequent lines start at inv_lbreaks[N], offset by
+	     OFFSET (which has already been calculated above).  */
+#define W_OFFSET(line, offset) ((line) == 0 ? offset : 0)
+#define VIS_LLEN(l)	((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l]))
+#define INV_LLEN(l)	(inv_lbreaks[l+1] - inv_lbreaks[l])
+#define VIS_CHARS(line) (visible_line + vis_lbreaks[line])
+#define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line)
+#define INV_LINE(line) (invisible_line + inv_lbreaks[line])
+	  /* For each line in the buffer, do the updating display. */
+	  for (linenum = 0; linenum <= inv_botlin; linenum++)
+	    {
+	      update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum,
+			   VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin);
+	      /* If this is the line with the prompt, we might need to
+		 compensate for invisible characters in the new line. Do
+		 this only if there is not more than one new line (which
+		 implies that we completely overwrite the old visible line)
+		 and the new line is shorter than the old.  Make sure we are
+		 at the end of the new line before clearing. */
+	      if (linenum == 0 &&
+		  inv_botlin == 0 && _rl_last_c_pos == out &&
+		  (wrap_offset > visible_wrap_offset) &&
+		  (_rl_last_c_pos < visible_first_line_len))
+		{
+		  nleft = screenwidth + wrap_offset - _rl_last_c_pos;
+		  if (nleft)
+		    _rl_clear_to_eol (nleft);
+		}
+	      /* Since the new first line is now visible, save its length. */
+	      if (linenum == 0)
+		visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset;
+	    }
+	  /* We may have deleted some lines.  If so, clear the left over
+	     blank ones at the bottom out. */
+	  if (_rl_vis_botlin > inv_botlin)
+	    {
+	      char *tt;
+	      for (; linenum <= _rl_vis_botlin; linenum++)
+		{
+		  tt = VIS_CHARS (linenum);
+		  _rl_move_vert (linenum);
+		  _rl_move_cursor_relative (0, tt);
+		  _rl_clear_to_eol
+		    ((linenum == _rl_vis_botlin) ? strlen (tt) : screenwidth);
+		}
+	    }
+	  _rl_vis_botlin = inv_botlin;
+	  /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a
+	     different screen line during this redisplay. */
+	  changed_screen_line = _rl_last_v_pos != cursor_linenum;
+	  if (changed_screen_line)
+	    {
+	      _rl_move_vert (cursor_linenum);
+	      /* If we moved up to the line with the prompt using term_up,
+	         the physical cursor position on the screen stays the same,
+	         but the buffer position needs to be adjusted to account
+	         for invisible characters. */
+	      if (cursor_linenum == 0 && wrap_offset)
+	        _rl_last_c_pos += wrap_offset;
+	    }
+	  /* We have to reprint the prompt if it contains invisible
+	     characters, since it's not generally OK to just reprint
+	     the characters from the current cursor position.  But we
+	     only need to reprint it if the cursor is before the last
+	     invisible character in the prompt string. */
+	  nleft = visible_length + wrap_offset;
+	  if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 &&
+	      _rl_last_c_pos <= last_invisible && local_prompt)
+	    {
+	      if (term_cr)
+		tputs (term_cr, 1, _rl_output_character_function);
+	      _rl_output_some_chars (local_prompt, nleft);
+	      _rl_last_c_pos = nleft;
+	    }
+	  /* Where on that line?  And where does that line start
+	     in the buffer? */
+	  pos = inv_lbreaks[cursor_linenum];
+	  /* nleft == number of characters in the line buffer between the
+	     start of the line and the cursor position. */
+	  nleft = c_pos - pos;
+	  /* Since _rl_backspace() doesn't know about invisible characters in the
+	     prompt, and there's no good way to tell it, we compensate for
+	     those characters here and call _rl_backspace() directly. */
+	  if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos)
+	    {
+	      _rl_backspace (_rl_last_c_pos - nleft);
+	      _rl_last_c_pos = nleft;
+	    }
+	  if (nleft != _rl_last_c_pos)
+	    _rl_move_cursor_relative (nleft, &invisible_line[pos]);
+	}
+}
+else				/* Do horizontal scrolling. */
+{
+#define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0)
+int lmargin, ndisp, nleft, phys_c_pos, t;
+/* Always at top line. */
+_rl_last_v_pos = 0;
+/* Compute where in the buffer the displayed line should start.  This
+	 will be LMARGIN. */
+/* The number of characters that will be displayed before the cursor. */
+ndisp = c_pos - wrap_offset;
+nleft  = visible_length + wrap_offset;
+/* Where the new cursor position will be on the screen.  This can be
+longer than SCREENWIDTH; if it is, lmargin will be adjusted. */
+phys_c_pos = c_pos - (last_lmargin ? last_lmargin : wrap_offset);
+t = screenwidth / 3;
+/* If the number of characters had already exceeded the screenwidth,
+last_lmargin will be > 0. */
+/* If the number of characters to be displayed is more than the screen
+width, compute the starting offset so that the cursor is about
+two-thirds of the way across the screen. */
+if (phys_c_pos > screenwidth - 2)
+	{
+	  lmargin = c_pos - (2 * t);
+	  if (lmargin < 0)
+	    lmargin = 0;
+	  /* If the left margin would be in the middle of a prompt with
+	     invisible characters, don't display the prompt at all. */
+	  if (wrap_offset && lmargin > 0 && lmargin < nleft)
+	    lmargin = nleft;
+	}
+else if (ndisp < screenwidth - 2)		/* XXX - was -1 */
+lmargin = 0;
+else if (phys_c_pos < 1)
+	{
+	  /* If we are moving back towards the beginning of the line and
+	     the last margin is no longer correct, compute a new one. */
+	  lmargin = ((c_pos - 1) / t) * t;	/* XXX */
+	  if (wrap_offset && lmargin > 0 && lmargin < nleft)
+	    lmargin = nleft;
+	}
+else
+lmargin = last_lmargin;
+/* If the first character on the screen isn't the first character
+	 in the display line, indicate this with a special character. */
+if (lmargin > 0)
+	line[lmargin] = '<';
+/* If SCREENWIDTH characters starting at LMARGIN do not encompass
+the whole line, indicate that with a special characters at the
+right edge of the screen.  If LMARGIN is 0, we need to take the
+wrap offset into account. */
+t = lmargin + M_OFFSET (lmargin, wrap_offset) + screenwidth;
+if (t < out)
+line[t - 1] = '>';
+if (!rl_display_fixed || forced_display || lmargin != last_lmargin)
+	{
+	  forced_display = 0;
+	  update_line (&visible_line[last_lmargin],
+		       &invisible_line[lmargin],
+		       0,
+		       screenwidth + visible_wrap_offset,
+		       screenwidth + (lmargin ? 0 : wrap_offset),
+		       0);
+	  /* If the visible new line is shorter than the old, but the number
+	     of invisible characters is greater, and we are at the end of
+	     the new line, we need to clear to eol. */
+	  t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset);
+	  if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) &&
+	      (_rl_last_c_pos == out) &&
+	      t < visible_first_line_len)
+	    {
+	      nleft = screenwidth - t;
+	      _rl_clear_to_eol (nleft);
+	    }
+	  visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset);
+	  if (visible_first_line_len > screenwidth)
+	    visible_first_line_len = screenwidth;
+	  _rl_move_cursor_relative (c_pos - lmargin, &invisible_line[lmargin]);
+	  last_lmargin = lmargin;
+	}
+}
+fflush (rl_outstream);
+/* Swap visible and non-visible lines. */
+{
+char *temp = visible_line;
+int *itemp = vis_lbreaks;
+visible_line = invisible_line;
+invisible_line = temp;
+vis_lbreaks = inv_lbreaks;
+inv_lbreaks = itemp;
+rl_display_fixed = 0;
+/* If we are displaying on a single line, and last_lmargin is > 0, we
+are not displaying any invisible characters, so set visible_wrap_offset
+to 0. */
+if (_rl_horizontal_scroll_mode && last_lmargin)
+visible_wrap_offset = 0;
+else
+visible_wrap_offset = wrap_offset;
+}
+}
+/* PWP: update_line() is based on finding the middle difference of each
+line on the screen; vis:
+			     /old first difference
+	/beginning of line   |	      /old last same       /old EOL
+	v		     v	      v		    v
+old:	eddie> Oh, my little gruntle-buggy is to me, as lurgid as
+new:	eddie> Oh, my little buggy says to me, as lurgid as
+	^		     ^	^			   ^
+	\beginning of line   |	\new last same	   \new end of line
+			     \new first difference
+All are character pointers for the sake of speed.  Special cases for
+no differences, as well as for end of line additions must be handeled.
+Could be made even smarter, but this works well enough */
+static void
+update_line (old, new, current_line, omax, nmax, inv_botlin)
+register char *old, *new;
+int current_line, omax, nmax, inv_botlin;
+{
+register char *ofd, *ols, *oe, *nfd, *nls, *ne;
+int temp, lendiff, wsatend, od, nd;
+int current_invis_chars;
+/* If we're at the right edge of a terminal that supports xn, we're
+ready to wrap around, so do so.  This fixes problems with knowing
+the exact cursor position and cut-and-paste with certain terminal
+emulators.  In this calculation, TEMP is the physical screen
+position of the cursor. */
+temp = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset);
+if (temp == screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode
+&& _rl_last_v_pos == current_line - 1)
+{
+if (new[0])
+	putc (new[0], rl_outstream);
+else
+	putc (' ', rl_outstream);
+_rl_last_c_pos = 1;		/* XXX */
+_rl_last_v_pos++;
+if (old[0] && new[0])
+old[0] = new[0];
+}
+/* Find first difference. */
+for (ofd = old, nfd = new;
+(ofd - old < omax) && *ofd && (*ofd == *nfd);
+ofd++, nfd++)
+;
+/* Move to the end of the screen line.  ND and OD are used to keep track
+of the distance between ne and new and oe and old, respectively, to
+move a subtraction out of each loop. */
+for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++);
+for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++);
+/* If no difference, continue to next line. */
+if (ofd == oe && nfd == ne)
+return;
+wsatend = 1;			/* flag for trailing whitespace */
+ols = oe - 1;			/* find last same */
+nls = ne - 1;
+while ((ols > ofd) && (nls > nfd) && (*ols == *nls))
+{
+if (*ols != ' ')
+	wsatend = 0;
+ols--;
+nls--;
+}
+if (wsatend)
+{
+ols = oe;
+nls = ne;
+}
+else if (*ols != *nls)
+{
+if (*ols)			/* don't step past the NUL */
+	ols++;
+if (*nls)
+	nls++;
+}
+/* count of invisible characters in the current invisible line. */
+current_invis_chars = W_OFFSET (current_line, wrap_offset);
+if (_rl_last_v_pos != current_line)
+{
+_rl_move_vert (current_line);
+if (current_line == 0 && visible_wrap_offset)
+	_rl_last_c_pos += visible_wrap_offset;
+}
+/* If this is the first line and there are invisible characters in the
+prompt string, and the prompt string has not changed, and the current
+cursor position is before the last invisible character in the prompt,
+and the index of the character to move to is past the end of the prompt
+string, then redraw the entire prompt string.  We can only do this
+reliably if the terminal supports a `cr' capability.
+This is not an efficiency hack -- there is a problem with redrawing
+portions of the prompt string if they contain terminal escape
+sequences (like drawing the `unbold' sequence without a corresponding
+`bold') that manifests itself on certain terminals. */
+lendiff = local_prompt ? strlen (local_prompt) : 0;
+od = ofd - old;	/* index of first difference in visible line */
+if (current_line == 0 && !_rl_horizontal_scroll_mode &&
+term_cr && lendiff > visible_length && _rl_last_c_pos > 0 &&
+od > lendiff && _rl_last_c_pos < last_invisible)
+{
+tputs (term_cr, 1, _rl_output_character_function);
+_rl_output_some_chars (local_prompt, lendiff);
+_rl_last_c_pos = lendiff;
+}
+_rl_move_cursor_relative (od, old);
+/* if (len (new) > len (old)) */
+lendiff = (nls - nfd) - (ols - ofd);
+/* If we are changing the number of invisible characters in a line, and
+the spot of first difference is before the end of the invisible chars,
+lendiff needs to be adjusted. */
+if (current_line == 0 && !_rl_horizontal_scroll_mode &&
+current_invis_chars != visible_wrap_offset)
+{
+temp = visible_wrap_offset - current_invis_chars;
+lendiff += temp;
+}
+/* Insert (diff (len (old), len (new)) ch. */
+temp = ne - nfd;
+if (lendiff > 0)
+{
+/* Non-zero if we're increasing the number of lines. */
+int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin;
+/* Sometimes it is cheaper to print the characters rather than
+	 use the terminal's capabilities.  If we're growing the number
+	 of lines, make sure we actually cause the new line to wrap
+	 around on auto-wrapping terminals. */
+if (terminal_can_insert && ((2 * temp) >= lendiff || term_IC) && (!_rl_term_autowrap || !gl))
+	{
+	  /* If lendiff > visible_length and _rl_last_c_pos == 0 and
+	     _rl_horizontal_scroll_mode == 1, inserting the characters with
+	     term_IC or term_ic will screw up the screen because of the
+	     invisible characters.  We need to just draw them. */
+	  if (*ols && (!_rl_horizontal_scroll_mode || _rl_last_c_pos > 0 ||
+			lendiff <= visible_length || !current_invis_chars))
+	    {
+	      insert_some_chars (nfd, lendiff);
+	      _rl_last_c_pos += lendiff;
+	    }
+	  else if (*ols == 0)
+	    {
+	      /* At the end of a line the characters do not have to
+		 be "inserted".  They can just be placed on the screen. */
+	      /* However, this screws up the rest of this block, which
+	         assumes you've done the insert because you can. */
+	      _rl_output_some_chars (nfd, lendiff);
+	      _rl_last_c_pos += lendiff;
+	    }
+	  else
+	    {
+	      /* We have horizontal scrolling and we are not inserting at
+		 the end.  We have invisible characters in this line.  This
+		 is a dumb update. */
+	      _rl_output_some_chars (nfd, temp);
+	      _rl_last_c_pos += temp;
+	      return;
+	    }
+	  /* Copy (new) chars to screen from first diff to last match. */
+	  temp = nls - nfd;
+	  if ((temp - lendiff) > 0)
+	    {
+	      _rl_output_some_chars (nfd + lendiff, temp - lendiff);
+	      _rl_last_c_pos += temp - lendiff;
+	    }
+	}
+else
+	{
+	  /* cannot insert chars, write to EOL */
+	  _rl_output_some_chars (nfd, temp);
+	  _rl_last_c_pos += temp;
+	}
+}
+else				/* Delete characters from line. */
+{
+/* If possible and inexpensive to use terminal deletion, then do so. */
+if (term_dc && (2 * temp) >= -lendiff)
+	{
+	  /* If all we're doing is erasing the invisible characters in the
+	     prompt string, don't bother.  It screws up the assumptions
+	     about what's on the screen. */
+	  if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 &&
+	      -lendiff == visible_wrap_offset)
+	    lendiff = 0;
+	  if (lendiff)
+	    delete_chars (-lendiff); /* delete (diff) characters */
+	  /* Copy (new) chars to screen from first diff to last match */
+	  temp = nls - nfd;
+	  if (temp > 0)
+	    {
+	      _rl_output_some_chars (nfd, temp);
+	      _rl_last_c_pos += temp;
+	    }
+	}
+/* Otherwise, print over the existing material. */
+else
+	{
+	  if (temp > 0)
+	    {
+	      _rl_output_some_chars (nfd, temp);
+	      _rl_last_c_pos += temp;
+	    }
+	  lendiff = (oe - old) - (ne - new);
+	  if (_rl_term_autowrap && current_line < inv_botlin)
+	    space_to_eol (lendiff);
+	  else
+	    _rl_clear_to_eol (lendiff);
+	}
+}
+}
+/* Tell the update routines that we have moved onto a new (empty) line. */
+int
+rl_on_new_line ()
+{
+if (visible_line)
+visible_line[0] = '\0';
+_rl_last_c_pos = _rl_last_v_pos = 0;
+_rl_vis_botlin = last_lmargin = 0;
+if (vis_lbreaks)
+vis_lbreaks[0] = vis_lbreaks[1] = 0;
+visible_wrap_offset = 0;
+return 0;
+}
+/* Actually update the display, period. */
+int
+rl_forced_update_display ()
+{
+if (visible_line)
+{
+register char *temp = visible_line;
+while (*temp)
+*temp++ = '\0';
+}
+rl_on_new_line ();
+forced_display++;
+(*rl_redisplay_function) ();
+return 0;
+}
+/* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
+DATA is the contents of the screen line of interest; i.e., where
+the movement is being done. */
+void
+_rl_move_cursor_relative (new, data)
+int new;
+char *data;
+{
+register int i;
+/* If we don't have to do anything, then return. */
+if (_rl_last_c_pos == new) return;
+/* It may be faster to output a CR, and then move forwards instead
+of moving backwards. */
+/* i == current physical cursor position. */
+i = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset);
+if (new == 0 || CR_FASTER (new, _rl_last_c_pos) ||
+(_rl_term_autowrap && i == screenwidth))
+{
+#if defined (__MSDOS__)
+putc ('\r', rl_outstream);
+#else
+tputs (term_cr, 1, _rl_output_character_function);
+#endif /* !__MSDOS__ */
+_rl_last_c_pos = 0;
+}
+if (_rl_last_c_pos < new)
+{
+/* Move the cursor forward.  We do it by printing the command
+	 to move the cursor forward if there is one, else print that
+	 portion of the output buffer again.  Which is cheaper? */
+/* The above comment is left here for posterity.  It is faster
+	 to print one character (non-control) than to print a control
+	 sequence telling the terminal to move forward one character.
+	 That kind of control is for people who don't know what the
+	 data is underneath the cursor. */
+#if defined (HACK_TERMCAP_MOTION)
+extern char *term_forward_char;
+if (term_forward_char)
+	for (i = _rl_last_c_pos; i < new; i++)
+	  tputs (term_forward_char, 1, _rl_output_character_function);
+else
+	for (i = _rl_last_c_pos; i < new; i++)
+	  putc (data[i], rl_outstream);
+#else
+for (i = _rl_last_c_pos; i < new; i++)
+	putc (data[i], rl_outstream);
+#endif /* HACK_TERMCAP_MOTION */
+}
+else if (_rl_last_c_pos != new)
+_rl_backspace (_rl_last_c_pos - new);
+_rl_last_c_pos = new;
+}
+/* PWP: move the cursor up or down. */
+void
+_rl_move_vert (to)
+int to;
+{
+register int delta, i;
+if (_rl_last_v_pos == to || to > screenheight)
+return;
+#if defined (__GO32__)
+{
+int row, col;
+ScreenGetCursor (&row, &col);
+ScreenSetCursor ((row + to - _rl_last_v_pos), col);
+}
+#else /* !__GO32__ */
+if ((delta = to - _rl_last_v_pos) > 0)
+{
+for (i = 0; i < delta; i++)
+	putc ('\n', rl_outstream);
+tputs (term_cr, 1, _rl_output_character_function);
+_rl_last_c_pos = 0;
+}
+else
+{			/* delta < 0 */
+if (term_up && *term_up)
+	for (i = 0; i < -delta; i++)
+	  tputs (term_up, 1, _rl_output_character_function);
+}
+#endif /* !__GO32__ */
+_rl_last_v_pos = to;		/* Now TO is here */
+}
+/* Physically print C on rl_outstream.  This is for functions which know
+how to optimize the display.  Return the number of characters output. */
+int
+rl_show_char (c)
+int c;
+{
+int n = 1;
+if (META_CHAR (c) && (_rl_output_meta_chars == 0))
+{
+fprintf (rl_outstream, "M-");
+n += 2;
+c = UNMETA (c);
+}
+#if defined (DISPLAY_TABS)
+if ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT)
+#else
+if (CTRL_CHAR (c) || c == RUBOUT)
+#endif /* !DISPLAY_TABS */
+{
+fprintf (rl_outstream, "C-");
+n += 2;
+c = CTRL_CHAR (c) ? UNCTRL (c) : '?';
+}
+putc (c, rl_outstream);
+fflush (rl_outstream);
+return n;
+}
+int
+rl_character_len (c, pos)
+register int c, pos;
+{
+unsigned char uc;
+uc = (unsigned char)c;
+if (META_CHAR (uc))
+return ((_rl_output_meta_chars == 0) ? 4 : 1);
+if (uc == '\t')
+{
+#if defined (DISPLAY_TABS)
+return (((pos | 7) + 1) - pos);
+#else
+return (2);
+#endif /* !DISPLAY_TABS */
+}
+if (CTRL_CHAR (c) || c == RUBOUT)
+return (2);
+return ((isprint (uc)) ? 1 : 2);
+}
+/* How to print things in the "echo-area".  The prompt is treated as a
+mini-modeline. */
+#if defined (USE_VARARGS)
+int
+#if defined (PREFER_STDARG)
+rl_message (const char *format, ...)
+#else
+rl_message (va_alist)
+va_dcl
+#endif
+{
+va_list args;
+#if defined (PREFER_VARARGS)
+char *format;
+#endif
+#if defined (PREFER_STDARG)
+va_start (args, format);
+#else
+va_start (args);
+format = va_arg (args, char *);
+#endif
+vsprintf (msg_buf, format, args);
+va_end (args);
+rl_display_prompt = msg_buf;
+(*rl_redisplay_function) ();
+return 0;
+}
+#else /* !USE_VARARGS */
+int
+rl_message (format, arg1, arg2)
+char *format;
+{
+sprintf (msg_buf, format, arg1, arg2);
+rl_display_prompt = msg_buf;
+(*rl_redisplay_function) ();
+return 0;
+}
+#endif /* !USE_VARARGS */
+/* How to clear things from the "echo-area". */
+int
+rl_clear_message ()
+{
+rl_display_prompt = rl_prompt;
+(*rl_redisplay_function) ();
+return 0;
+}
+int
+rl_reset_line_state ()
+{
+rl_on_new_line ();
+rl_display_prompt = rl_prompt ? rl_prompt : "";
+forced_display = 1;
+return 0;
+}
+static char *saved_local_prompt;
+static char *saved_local_prefix;
+static int saved_last_invisible;
+static int saved_visible_length;
+void
+_rl_save_prompt ()
+{
+saved_local_prompt = local_prompt;
+saved_local_prefix = local_prompt_prefix;
+saved_last_invisible = last_invisible;
+saved_visible_length = visible_length;
+local_prompt = local_prompt_prefix = (char *)0;
+last_invisible = visible_length = 0;
+}
+void
+_rl_restore_prompt ()
+{
+if (local_prompt)
+free (local_prompt);
+if (local_prompt_prefix)
+free (local_prompt_prefix);
+local_prompt = saved_local_prompt;
+local_prompt_prefix = saved_local_prefix;
+last_invisible = saved_last_invisible;
+visible_length = saved_visible_length;
+}
+char *
+_rl_make_prompt_for_search (pchar)
+int pchar;
+{
+int len;
+char *pmt;
+_rl_save_prompt ();
+if (saved_local_prompt == 0)
+{
+len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0;
+pmt = xmalloc (len + 2);
+if (len)
+strcpy (pmt, rl_prompt);
+pmt[len] = pchar;
+pmt[len+1] = '\0';
+}
+else
+{
+len = *saved_local_prompt ? strlen (saved_local_prompt) : 0;
+pmt = xmalloc (len + 2);
+if (len)
+strcpy (pmt, saved_local_prompt);
+pmt[len] = pchar;
+pmt[len+1] = '\0';
+local_prompt = savestring (pmt);
+last_invisible = saved_last_invisible;
+visible_length = saved_visible_length + 1;
+}
+return pmt;
+}
+/* Quick redisplay hack when erasing characters at the end of the line. */
+void
+_rl_erase_at_end_of_line (l)
+int l;
+{
+register int i;
+_rl_backspace (l);
+for (i = 0; i < l; i++)
+putc (' ', rl_outstream);
+_rl_backspace (l);
+for (i = 0; i < l; i++)
+visible_line[--_rl_last_c_pos] = '\0';
+rl_display_fixed++;
+}
+/* Clear to the end of the line.  COUNT is the minimum
+number of character spaces to clear, */
+void
+_rl_clear_to_eol (count)
+int count;
+{
+#if !defined (__GO32__)
+if (term_clreol)
+tputs (term_clreol, 1, _rl_output_character_function);
+else if (count)
+#endif /* !__GO32__ */
+space_to_eol (count);
+}
+/* Clear to the end of the line using spaces.  COUNT is the minimum
+number of character spaces to clear, */
+static void
+space_to_eol (count)
+int count;
+{
+register int i;
+for (i = 0; i < count; i++)
+putc (' ', rl_outstream);
+_rl_last_c_pos += count;
+}
+void
+_rl_clear_screen ()
+{
+#if !defined (__GO32__)
+if (term_clrpag)
+tputs (term_clrpag, 1, _rl_output_character_function);
+else
+#endif /* !__GO32__ */
+crlf ();
+}
+/* Insert COUNT characters from STRING to the output stream. */
+static void
+insert_some_chars (string, count)
+char *string;
+int count;
+{
+#if defined (__GO32__)
+int row, col, width;
+char *row_start;
+ScreenGetCursor (&row, &col);
+width = ScreenCols ();
+row_start = ScreenPrimary + (row * width);
+memcpy (row_start + col + count, row_start + col, width - col - count);
+/* Place the text on the screen. */
+_rl_output_some_chars (string, count);
+#else /* !_GO32 */
+/* If IC is defined, then we do not have to "enter" insert mode. */
+if (term_IC)
+{
+char *buffer;
+buffer = tgoto (term_IC, 0, count);
+tputs (buffer, 1, _rl_output_character_function);
+_rl_output_some_chars (string, count);
+}
+else
+{
+register int i;
+/* If we have to turn on insert-mode, then do so. */
+if (term_im && *term_im)
+	tputs (term_im, 1, _rl_output_character_function);
+/* If there is a special command for inserting characters, then
+	 use that first to open up the space. */
+if (term_ic && *term_ic)
+	{
+	  for (i = count; i--; )
+	    tputs (term_ic, 1, _rl_output_character_function);
+	}
+/* Print the text. */
+_rl_output_some_chars (string, count);
+/* If there is a string to turn off insert mode, we had best use
+	 it now. */
+if (term_ei && *term_ei)
+	tputs (term_ei, 1, _rl_output_character_function);
+}
+#endif /* !__GO32__ */
+}
+/* Delete COUNT characters from the display line. */
+static void
+delete_chars (count)
+int count;
+{
+#if defined (__GO32__)
+int row, col, width;
+char *row_start;
+ScreenGetCursor (&row, &col);
+width = ScreenCols ();
+row_start = ScreenPrimary + (row * width);
+memcpy (row_start + col, row_start + col + count, width - col - count);
+memset (row_start + width - count, 0, count * 2);
+#else /* !_GO32 */
+if (count > screenwidth)	/* XXX */
+return;
+if (term_DC && *term_DC)
+{
+char *buffer;
+buffer = tgoto (term_DC, count, count);
+tputs (buffer, count, _rl_output_character_function);
+}
+else
+{
+if (term_dc && *term_dc)
+	while (count--)
+	  tputs (term_dc, 1, _rl_output_character_function);
+}
+#endif /* !__GO32__ */
+}
+void
+_rl_update_final ()
+{
+int full_lines;
+full_lines = 0;
+/* If the cursor is the only thing on an otherwise-blank last line,
+compensate so we don't print an extra CRLF. */
+if (_rl_vis_botlin && _rl_last_c_pos == 0 &&
+	visible_line[vis_lbreaks[_rl_vis_botlin]] == 0)
+{
+_rl_vis_botlin--;
+full_lines = 1;
+}
+_rl_move_vert (_rl_vis_botlin);
+/* If we've wrapped lines, remove the final xterm line-wrap flag. */
+if (full_lines && _rl_term_autowrap && (VIS_LLEN(_rl_vis_botlin) == screenwidth))
+{
+char *last_line;
+last_line = &visible_line[inv_lbreaks[_rl_vis_botlin]];
+_rl_move_cursor_relative (screenwidth - 1, last_line);
+_rl_clear_to_eol (0);
+putc (last_line[screenwidth - 1], rl_outstream);
+}
+_rl_vis_botlin = 0;
+crlf ();
+fflush (rl_outstream);
+rl_display_fixed++;
+}
+/* Move to the start of the current line. */
+static void
+cr ()
+{
+if (term_cr)
+{
+tputs (term_cr, 1, _rl_output_character_function);
+_rl_last_c_pos = 0;
+}
+}
+/* Redisplay the current line after a SIGWINCH is received. */
+void
+_rl_redisplay_after_sigwinch ()
+{
+char *t, *oldp;
+/* Clear the current line and put the cursor at column 0.  Make sure
+the right thing happens if we have wrapped to a new screen line. */
+if (term_cr)
+{
+tputs (term_cr, 1, _rl_output_character_function);
+_rl_last_c_pos = 0;
+if (term_clreol)
+	tputs (term_clreol, 1, _rl_output_character_function);
+else
+	{
+	  space_to_eol (screenwidth);
+	  tputs (term_cr, 1, _rl_output_character_function);
+	}
+if (_rl_last_v_pos > 0)
+	_rl_move_vert (0);
+}
+else
+crlf ();
+/* Redraw only the last line of a multi-line prompt. */
+t = strrchr (rl_display_prompt, '\n');
+if (t)
+{
+oldp = rl_display_prompt;
+rl_display_prompt = ++t;
+rl_forced_update_display ();
+rl_display_prompt = oldp;
+}
+else
+rl_forced_update_display ();
+}
+void
+_rl_clean_up_for_exit ()
+{
+if (readline_echoing_p)
+{
+_rl_move_vert (_rl_vis_botlin);
+_rl_vis_botlin = 0;
+fflush (rl_outstream);
+rl_restart_output ();
+}
+}

Mercurial > hg > octave-lyh

comparison readline/display.c @ 2996:9d4e3a9de17e