kolibrios/programs/develop/open watcom/trunk/clib/streamio/flush.c

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/****************************************************************************
*
* Open Watcom Project
*
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
* ========================================================================
*
* This file contains Original Code and/or Modifications of Original
* Code as defined in and that are subject to the Sybase Open Watcom
* Public License version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
* provided with the Original Code and Modifications, and is also
* available at www.sybase.com/developer/opensource.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
* NON-INFRINGEMENT. Please see the License for the specific language
* governing rights and limitations under the License.
*
* ========================================================================
*
* Description: Implementation of fflush() helper routine.
*
****************************************************************************/
#include "variety.h"
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include "fileacc.h"
#include "rtdata.h"
#include "seterrno.h"
#include "qwrite.h"
#include "lseek.h"
#include "flush.h"
#if defined( __NETWARE__ ) && defined( _THIN_LIB )
/* Take flush from LibC */
_WCRTLINK int __flush( FILE *fp )
{
return( fflush( fp ) );
}
#else
_WCRTLINK int __flush( FILE *fp )
{
int len;
long offset;
int ret;
char *ptr;
unsigned amount;
ret = 0;
_AccessFile( fp );
if( fp->_flag & _DIRTY ) {
fp->_flag &= ~_DIRTY;
if( (fp->_flag & _WRITE) && (_FP_BASE(fp) != NULL) ) {
ptr = _FP_BASE(fp);
amount = fp->_cnt;
while( amount != 0 && ret == 0 ) {
len = __qwrite( fileno( fp ), ptr, amount ); /* 02-aug-90 */
if( len == -1 ) {
fp->_flag |= _SFERR;
ret = EOF;
}
#ifndef __UNIX__
else if( len == 0 ) {
__set_errno( ENOSPC ); /* 12-nov-88 */
fp->_flag |= _SFERR;
ret = EOF;
}
#endif
ptr += len;
amount -= len;
}
}
} else if( _FP_BASE(fp) != NULL ) { /* not dirty */
/* fseek( fp, ftell(fp), SEEK_SET ); */
fp->_flag &= ~_EOF;
if( !(fp->_flag & _ISTTY) ) {
offset = fp->_cnt;
if( offset != 0 ) { /* 10-aug-89 JD */
offset = __lseek( fileno( fp ), -offset, SEEK_CUR );
}
if( offset == -1 ) {
fp->_flag |= _SFERR;
ret = EOF;
}
}
}
fp->_ptr = _FP_BASE(fp); /* reset ptr to start of buffer */
fp->_cnt = 0;
#if !defined( __NETWARE__ ) && !defined( __OSI__ )
if( ret == 0 && (_FP_EXTFLAGS(fp) & _COMMIT) ) {
if( fsync( fileno( fp ) ) == -1 ) {
ret = EOF;
}
}
#endif
_ReleaseFile( fp );
return( ret );
}
#endif