octave-shane/gnulib-hg: lib/fflush.c annotate

annotate lib/fflush.c @ 8717:3afefd650c3a

On BSD implementations, when we call lseek(), we must also update or disable the stream's file descriptor position cache.

author	Bruno Haible <bruno@clisp.org>
date	Thu, 26 Apr 2007 09:25:05 +0000
parents	caaaf4823aec
children	5122cdde0f7b

rev	line source
8657 05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	1 /* fflush.c -- allow flushing input streams
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	2 Copyright (C) 2007 Free Software Foundation, Inc.
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	3
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	4 This program is free software; you can redistribute it and/or modify
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	5 it under the terms of the GNU General Public License as published by
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	6 the Free Software Foundation; either version 2, or (at your option)
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	7 any later version.
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	8
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	9 This program is distributed in the hope that it will be useful,
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	10 but WITHOUT ANY WARRANTY; without even the implied warranty of
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	12 GNU General Public License for more details.
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	13
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	14 You should have received a copy of the GNU General Public License
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	15 along with this program; if not, write to the Free Software Foundation,
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	17
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	18 /* Written by Eric Blake. */
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	19
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	20 #include <config.h>
8705 caaaf4823aec * lib/fflush.c: Fix missing include. Eric Blake <ebb9@byu.net> parents: 8700 diff changeset	21
caaaf4823aec * lib/fflush.c: Fix missing include. Eric Blake <ebb9@byu.net> parents: 8700 diff changeset	22 /* Specification. */
caaaf4823aec * lib/fflush.c: Fix missing include. Eric Blake <ebb9@byu.net> parents: 8700 diff changeset	23 #include <stdio.h>
caaaf4823aec * lib/fflush.c: Fix missing include. Eric Blake <ebb9@byu.net> parents: 8700 diff changeset	24
8657 05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	25 #include <errno.h>
8705 caaaf4823aec * lib/fflush.c: Fix missing include. Eric Blake <ebb9@byu.net> parents: 8700 diff changeset	26 #include <unistd.h>
8657 05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	27
8700 f82b54db5bb8 Make fflush rely on fpurge. Eric Blake <ebb9@byu.net> parents: 8669 diff changeset	28 #include "fpurge.h"
8657 05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	29
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	30 #undef fflush
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	31
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	32 /* Flush all pending data on STREAM according to POSIX rules. Both
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	33 output and seekable input streams are supported. */
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	34 int
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	35 rpl_fflush (FILE *stream)
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	36 {
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	37 int result;
8700 f82b54db5bb8 Make fflush rely on fpurge. Eric Blake <ebb9@byu.net> parents: 8669 diff changeset	38 off_t pos;
8657 05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	39
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	40 /* Try flushing the stream. C89 guarantees behavior of output
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	41 streams, so we only need to worry if failure might have been on
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	42 an input stream. When stream is NULL, POSIX only requires
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	43 flushing of output streams. */
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	44 result = fflush (stream);
8700 f82b54db5bb8 Make fflush rely on fpurge. Eric Blake <ebb9@byu.net> parents: 8669 diff changeset	45 if (! stream \|\| result == 0 \|\| errno != EBADF)
8657 05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	46 return result;
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	47
8700 f82b54db5bb8 Make fflush rely on fpurge. Eric Blake <ebb9@byu.net> parents: 8669 diff changeset	48 /* POSIX does not specify fflush behavior for non-seekable input
f82b54db5bb8 Make fflush rely on fpurge. Eric Blake <ebb9@byu.net> parents: 8669 diff changeset	49 streams. */
f82b54db5bb8 Make fflush rely on fpurge. Eric Blake <ebb9@byu.net> parents: 8669 diff changeset	50 pos = ftello (stream);
f82b54db5bb8 Make fflush rely on fpurge. Eric Blake <ebb9@byu.net> parents: 8669 diff changeset	51 if (pos == -1)
8657 05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	52 {
8700 f82b54db5bb8 Make fflush rely on fpurge. Eric Blake <ebb9@byu.net> parents: 8669 diff changeset	53 errno = EBADF;
8657 05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	54 return EOF;
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	55 }
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	56
05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	57 /* To get here, we must be flushing a seekable input stream, so the
8700 f82b54db5bb8 Make fflush rely on fpurge. Eric Blake <ebb9@byu.net> parents: 8669 diff changeset	58 semantics of fpurge are now appropriate to clear the buffer. To
f82b54db5bb8 Make fflush rely on fpurge. Eric Blake <ebb9@byu.net> parents: 8669 diff changeset	59 avoid losing data, the lseek is also necessary. */
8657 05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	60 result = fpurge (stream);
8717 3afefd650c3a On BSD implementations, when we call lseek(), we must also update or disable Bruno Haible <bruno@clisp.org> parents: 8705 diff changeset	61 if (result != 0)
3afefd650c3a On BSD implementations, when we call lseek(), we must also update or disable Bruno Haible <bruno@clisp.org> parents: 8705 diff changeset	62 return result;
3afefd650c3a On BSD implementations, when we call lseek(), we must also update or disable Bruno Haible <bruno@clisp.org> parents: 8705 diff changeset	63 pos = lseek (fileno (stream), pos, SEEK_SET);
3afefd650c3a On BSD implementations, when we call lseek(), we must also update or disable Bruno Haible <bruno@clisp.org> parents: 8705 diff changeset	64 if (pos == -1)
8700 f82b54db5bb8 Make fflush rely on fpurge. Eric Blake <ebb9@byu.net> parents: 8669 diff changeset	65 return EOF;
8717 3afefd650c3a On BSD implementations, when we call lseek(), we must also update or disable Bruno Haible <bruno@clisp.org> parents: 8705 diff changeset	66 #if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
3afefd650c3a On BSD implementations, when we call lseek(), we must also update or disable Bruno Haible <bruno@clisp.org> parents: 8705 diff changeset	67 stream->_offset = pos;
3afefd650c3a On BSD implementations, when we call lseek(), we must also update or disable Bruno Haible <bruno@clisp.org> parents: 8705 diff changeset	68 stream->_flags \|= __SOFF;
3afefd650c3a On BSD implementations, when we call lseek(), we must also update or disable Bruno Haible <bruno@clisp.org> parents: 8705 diff changeset	69 #endif
3afefd650c3a On BSD implementations, when we call lseek(), we must also update or disable Bruno Haible <bruno@clisp.org> parents: 8705 diff changeset	70 return 0;
8657 05f21166eb81 * lib/stdio_.h [REPLACE_FFLUSH]: Declare rpl_fflush. Eric Blake <ebb9@byu.net> parents: diff changeset	71 }

Mercurial > hg > octave-shane > gnulib-hg

annotate lib/fflush.c @ 8717:3afefd650c3a