/*- * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Chris Torek. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if defined(LIBC_SCCS) && !defined(lint) static char rcsid[] = "$OpenBSD: fflush.c,v 1.2 1996/08/19 08:32:26 tholo Exp $"; #endif /* LIBC_SCCS and not lint */ #include <errno.h> #include <stdio.h> #include "local.h" /* Flush a single file, or (if fp is NULL) all files. */ int fflush(fp) register FILE *fp; { if (fp == NULL) return (_fwalk(__sflush)); if ((fp->_flags & (__SWR | __SRW)) == 0) { errno = EBADF; return (EOF); } return (__sflush(fp)); } int __sflush(fp) register FILE *fp; { register unsigned char *p; register int n, t; t = fp->_flags; if ((t & __SWR) == 0) return (0); if ((p = fp->_bf._base) == NULL) return (0); n = fp->_p - p; /* write this much */ /* * Set these immediately to avoid problems with longjmp and to allow * exchange buffering (via setvbuf) in user write function. */ fp->_p = p; fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size; for (; n > 0; n -= t, p += t) { t = (*fp->_write)(fp->_cookie, (char *)p, n); if (t <= 0) { fp->_flags |= __SERR; return (EOF); } } return (0); }