69 lines
2.6 KiB
C
69 lines
2.6 KiB
C
/****************************************************************************
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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 __ioalloc() 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 "liballoc.h"
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#include <unistd.h>
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#include "rtdata.h"
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#include "streamio.h"
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void __ioalloc( FILE *fp )
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{
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__chktty( fp ); /* JBS 28-aug-90 */
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if( fp->_bufsize == 0 ) {
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if( fp->_flag & _IOLBF ) {
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fp->_bufsize = 134;
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} else if( fp->_flag & _IONBF ) {
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/* Use small but reasonably sized buffer; otherwise we will end
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* up calling into the OS for every character, completely killing
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* performance on unbuffered stream output through printf() etc.,
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* especially in extended DOS because of mode switches.
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*/
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fp->_bufsize = 64;
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} else {
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fp->_bufsize = BUFSIZ;
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}
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}
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_FP_BASE(fp) = lib_malloc( fp->_bufsize );
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if( _FP_BASE(fp) == NULL ) {
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fp->_flag &= ~(_IONBF | _IOLBF | _IOFBF);
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fp->_flag |= _IONBF; /* can't get big buffer */
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_FP_BASE(fp) = (char *)&(fp->_ungotten);
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fp->_bufsize = 1;
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} else {
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fp->_flag |= _BIGBUF; /* got big buffer */
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}
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fp->_ptr = _FP_BASE(fp);
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fp->_cnt = 0;
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}
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