80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
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/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: Platform independent setvbuf() implementation.
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*
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****************************************************************************/
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#include "variety.h"
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#include <stdio.h>
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#include <stddef.h>
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#include <limits.h>
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#include "fileacc.h"
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#include "rtdata.h"
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#include "streamio.h"
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extern void __full_io_exit();
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_WCRTLINK int setvbuf( FILE *fp, char *buf, int mode, size_t size )
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{
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__stream_check( fp, 1 );
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__null_check( buf, 2 );
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if( size > INT_MAX ) {
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/* 16-bit buffer filling code can't handle >32k (-ve size) */
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return( -1 );
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}
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/* check for allowable values for mode */
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switch( mode ) {
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case _IOFBF:
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case _IOLBF:
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case _IONBF:
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break;
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default:
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return( -1 );
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}
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if( buf != NULL && size == 0 ) { /* JBS 27-aug-90 */
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return( -1 );
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}
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_ValidFile( fp, -1 );
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_AccessFile( fp );
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__chktty( fp ); /* JBS 28-aug-90 */
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if( size != 0 ) {
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fp->_bufsize = size; /* JBS 27-aug-90 */
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}
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_FP_BASE(fp) = buf;
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fp->_ptr = buf;
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fp->_flag &= ~(_IONBF | _IOLBF | _IOFBF); /* FWC 14-jul-87 */
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fp->_flag |= mode;
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if( buf == NULL ) { /* FWC 16-mar-93 */
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__ioalloc( fp );
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}
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_ReleaseFile( fp );
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return( 0 );
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}
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