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/* $OpenBSD: fflush.c,v 1.9 2015/08/31 02:53:57 guenther Exp $ */ |
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/*- |
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* Copyright (c) 1990, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* This code is derived from software contributed to Berkeley by |
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* Chris Torek. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <errno.h> |
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#include <stdio.h> |
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#include "local.h" |
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/* Flush a single file, or (if fp is NULL) all files. */ |
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int |
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fflush(FILE *fp) |
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{ |
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int r; |
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✗✓ |
4132 |
if (fp == NULL) |
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return (_fwalk(__sflush_locked)); |
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✗✓ |
2066 |
FLOCKFILE(fp); |
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✗✓ |
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if ((fp->_flags & (__SWR | __SRW)) == 0) { |
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errno = EBADF; |
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r = EOF; |
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} else |
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r = __sflush(fp); |
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✗✓ |
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FUNLOCKFILE(fp); |
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return (r); |
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} |
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DEF_STRONG(fflush); |
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int |
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__sflush(FILE *fp) |
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{ |
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unsigned char *p; |
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int n, t; |
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15549188 |
t = fp->_flags; |
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✓✓ |
7774594 |
if ((t & __SWR) == 0) |
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7738140 |
return (0); |
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✓✓ |
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if ((p = fp->_bf._base) == NULL) |
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return (0); |
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n = fp->_p - p; /* write this much */ |
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/* |
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* Set these immediately to avoid problems with longjmp and to allow |
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* exchange buffering (via setvbuf) in user write function. |
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*/ |
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fp->_p = p; |
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✓✓ |
99375 |
fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size; |
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✓✓ |
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for (; n > 0; n -= t, p += t) { |
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t = (*fp->_write)(fp->_cookie, (char *)p, n); |
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✓✓ |
33987 |
if (t <= 0) { |
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fp->_flags |= __SERR; |
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return (EOF); |
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} |
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} |
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return (0); |
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7774594 |
} |
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int |
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__sflush_locked(FILE *fp) |
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{ |
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int r; |
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FLOCKFILE(fp); |
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r = __sflush(fp); |
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FUNLOCKFILE(fp); |
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return (r); |
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} |