fflush.c revision 71579
11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1990, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * This code is derived from software contributed to Berkeley by 61573Srgrimes * Chris Torek. 71573Srgrimes * 81573Srgrimes * Redistribution and use in source and binary forms, with or without 91573Srgrimes * modification, are permitted provided that the following conditions 101573Srgrimes * are met: 111573Srgrimes * 1. Redistributions of source code must retain the above copyright 121573Srgrimes * notice, this list of conditions and the following disclaimer. 131573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141573Srgrimes * notice, this list of conditions and the following disclaimer in the 151573Srgrimes * documentation and/or other materials provided with the distribution. 161573Srgrimes * 3. All advertising materials mentioning features or use of this software 171573Srgrimes * must display the following acknowledgement: 181573Srgrimes * This product includes software developed by the University of 191573Srgrimes * California, Berkeley and its contributors. 201573Srgrimes * 4. Neither the name of the University nor the names of its contributors 211573Srgrimes * may be used to endorse or promote products derived from this software 221573Srgrimes * without specific prior written permission. 231573Srgrimes * 241573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341573Srgrimes * SUCH DAMAGE. 351573Srgrimes */ 361573Srgrimes 371573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 3816586Sjraynard#if 0 391573Srgrimesstatic char sccsid[] = "@(#)fflush.c 8.1 (Berkeley) 6/4/93"; 4016586Sjraynard#endif 4116586Sjraynardstatic const char rcsid[] = 4250476Speter "$FreeBSD: head/lib/libc/stdio/fflush.c 71579 2001-01-24 13:01:12Z deischen $"; 431573Srgrimes#endif /* LIBC_SCCS and not lint */ 441573Srgrimes 4571579Sdeischen#include "namespace.h" 461573Srgrimes#include <errno.h> 471573Srgrimes#include <stdio.h> 4871579Sdeischen#include "un-namespace.h" 4971579Sdeischen#include "libc_private.h" 501573Srgrimes#include "local.h" 511573Srgrimes 5271579Sdeischen/* 5371579Sdeischen * Flush a single file, or (if fp is NULL) all files. 5471579Sdeischen * MT-safe version 5571579Sdeischen */ 5613545Sjulianint 5771579Sdeischenfflush(FILE *fp) 581573Srgrimes{ 5913545Sjulian int retval; 601573Srgrimes 611573Srgrimes if (fp == NULL) 621573Srgrimes return (_fwalk(__sflush)); 6335129Sjb FLOCKFILE(fp); 641573Srgrimes if ((fp->_flags & (__SWR | __SRW)) == 0) { 651573Srgrimes errno = EBADF; 6613545Sjulian retval = EOF; 6771579Sdeischen } else 6813545Sjulian retval = __sflush(fp); 6935129Sjb FUNLOCKFILE(fp); 7013545Sjulian return (retval); 711573Srgrimes} 721573Srgrimes 7371579Sdeischen/* 7471579Sdeischen * Flush a single file, or (if fp is NULL) all files. 7571579Sdeischen * Non-MT-safe version 7671579Sdeischen */ 7713545Sjulianint 7871579Sdeischen__fflush(FILE *fp) 791573Srgrimes{ 8071579Sdeischen int retval; 811573Srgrimes 8271579Sdeischen if (fp == NULL) 8371579Sdeischen return (_fwalk(__sflush)); 8471579Sdeischen if ((fp->_flags & (__SWR | __SRW)) == 0) { 8571579Sdeischen errno = EBADF; 8671579Sdeischen retval = EOF; 8771579Sdeischen } else 8871579Sdeischen retval = __sflush(fp); 8971579Sdeischen return (retval); 9071579Sdeischen} 9171579Sdeischen 9271579Sdeischenint 9371579Sdeischen__sflush(FILE *fp) 9471579Sdeischen{ 9571579Sdeischen unsigned char *p; 9671579Sdeischen int n, t; 9771579Sdeischen 981573Srgrimes t = fp->_flags; 991573Srgrimes if ((t & __SWR) == 0) 1001573Srgrimes return (0); 1011573Srgrimes 1021573Srgrimes if ((p = fp->_bf._base) == NULL) 1031573Srgrimes return (0); 1041573Srgrimes 1051573Srgrimes n = fp->_p - p; /* write this much */ 1061573Srgrimes 1071573Srgrimes /* 1081573Srgrimes * Set these immediately to avoid problems with longjmp and to allow 1091573Srgrimes * exchange buffering (via setvbuf) in user write function. 1101573Srgrimes */ 1111573Srgrimes fp->_p = p; 1121573Srgrimes fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size; 1131573Srgrimes 1141573Srgrimes for (; n > 0; n -= t, p += t) { 1151573Srgrimes t = (*fp->_write)(fp->_cookie, (char *)p, n); 1161573Srgrimes if (t <= 0) { 1171573Srgrimes fp->_flags |= __SERR; 1181573Srgrimes return (EOF); 1191573Srgrimes } 1201573Srgrimes } 1211573Srgrimes return (0); 1221573Srgrimes} 123