Mercurial > hg > octave-lojdl > gnulib-hg
changeset 9158:d45f26a2b8ff
New module 'freadahead'.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sun, 19 Aug 2007 17:42:40 +0000 |
parents | 18308c6e516b |
children | e21121c06cf2 |
files | ChangeLog MODULES.html.sh lib/freadahead.c lib/freadahead.h modules/freadahead |
diffstat | 5 files changed, 136 insertions(+), 0 deletions(-) [+] |
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--- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,11 @@ +2007-08-19 Bruno Haible <bruno@clisp.org> + + * modules/freadahead: New file. + * lib/freadahead.h: New file. + * lib/freadahead.c: New file. + * MODULES.html.sh (File stream based Input/Output): Add freadahead, + fbufmode, fpurge, freadable, fwritable. + 2007-08-19 Eric Blake <ebb9@byu.net> Test yesno in combination with closein.
--- a/MODULES.html.sh +++ b/MODULES.html.sh @@ -2194,9 +2194,14 @@ func_module close-stream func_module closein func_module closeout + func_module fbufmode func_module fopen-safer func_module fpending + func_module fpurge + func_module freadable + func_module freadahead func_module freading + func_module fwritable func_module fwriting func_module getpass func_module getpass-gnu
new file mode 100644 --- /dev/null +++ b/lib/freadahead.c @@ -0,0 +1,62 @@ +/* Retrieve information about a FILE stream. + Copyright (C) 2007 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#include <config.h> + +/* Specification. */ +#include "freadahead.h" + +size_t +freadahead (FILE *fp) +{ +#if defined _IO_ferror_unlocked /* GNU libc, BeOS */ + if (fp->_IO_write_ptr > fp->_IO_write_base) + return 0; + return fp->_IO_read_end - fp->_IO_read_ptr; +#elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */ + if ((fp->_flags & __SWR) != 0 || fp->_r < 0) + return 0; + return fp->_r; +#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */ +# if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */ +# define fp_ ((struct { unsigned char *_ptr; \ + unsigned char *_base; \ + unsigned char *_end; \ + long _cnt; \ + int _file; \ + unsigned int _flag; \ + } *) fp) + if ((fp_->_flag & _IOWRT) != 0) + return 0; + return fp_->_cnt; +# else + if ((fp->_flag & _IOWRT) != 0) + return 0; + return fp->_cnt; +# endif +#elif defined __UCLIBC__ /* uClibc */ +# ifdef __STDIO_BUFFERS + if (fp->__modeflags & __FLAG_WRITING) + return 0; + return fp->__bufread - fp->__bufpos; +# else + return 0; +# endif +#else + #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread on your system, then report this to bug-gnulib." +#endif +}
new file mode 100644 --- /dev/null +++ b/lib/freadahead.h @@ -0,0 +1,37 @@ +/* Retrieve information about a FILE stream. + Copyright (C) 2007 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#include <stddef.h> +#include <stdio.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/* Assuming the stream STREAM is open for reading: + Return the number of bytes waiting in the input buffer of STREAM. + + If this number is 0 and the stream is not currently writing, + fflush (STREAM) is known to be a no-op. + + STREAM must not be wide-character oriented. */ + +extern size_t freadahead (FILE *stream); + +#ifdef __cplusplus +} +#endif
new file mode 100644 --- /dev/null +++ b/modules/freadahead @@ -0,0 +1,24 @@ +Description: +freadahead() function: Determine the number of bytes waiting in the input +buffer of a stream. + +Files: +lib/freadahead.h +lib/freadahead.c + +Depends-on: + +configure.ac: + +Makefile.am: +lib_SOURCES += freadahead.c + +Include: +"freadahead.h" + +License: +LGPL + +Maintainer: +Bruno Haible +