kolibrios/programs/develop/open watcom/trunk/clib/streamio/setvbuf.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: Platform independent setvbuf() implementation.
*
****************************************************************************/
#include "variety.h"
#include <stdio.h>
#include <stddef.h>
#include <limits.h>
#include "fileacc.h"
#include "rtdata.h"
#include "streamio.h"
extern void __full_io_exit();
_WCRTLINK int setvbuf( FILE *fp, char *buf, int mode, size_t size )
{
__stream_check( fp, 1 );
__null_check( buf, 2 );
if( size > INT_MAX ) {
/* 16-bit buffer filling code can't handle >32k (-ve size) */
return( -1 );
}
/* check for allowable values for mode */
switch( mode ) {
case _IOFBF:
case _IOLBF:
case _IONBF:
break;
default:
return( -1 );
}
if( buf != NULL && size == 0 ) { /* JBS 27-aug-90 */
return( -1 );
}
_ValidFile( fp, -1 );
_AccessFile( fp );
__chktty( fp ); /* JBS 28-aug-90 */
if( size != 0 ) {
fp->_bufsize = size; /* JBS 27-aug-90 */
}
_FP_BASE(fp) = buf;
fp->_ptr = buf;
fp->_flag &= ~(_IONBF | _IOLBF | _IOFBF); /* FWC 14-jul-87 */
fp->_flag |= mode;
if( buf == NULL ) { /* FWC 16-mar-93 */
__ioalloc( fp );
}
_ReleaseFile( fp );
return( 0 );
}