93 lines
3.1 KiB
C
93 lines
3.1 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 __allocfp() 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 <string.h>
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#include <errno.h>
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#include "liballoc.h"
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#include "fileacc.h"
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#include "rtdata.h"
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#include "seterrno.h"
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#include "streamio.h"
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#define KEEP_FLAGS (_READ | _WRITE | _DYNAMIC)
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FILE *__allocfp( int handle )
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{
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FILE *end;
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FILE *fp;
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__stream_link *link;
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unsigned flags;
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handle = handle;
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_AccessIOB();
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/* Try and take one off the recently closed list */
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link = _RWD_cstream;
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if( link != NULL ) {
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_RWD_cstream = link->next;
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fp = link->stream;
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flags = (fp->_flag & KEEP_FLAGS) | (_READ | _WRITE);
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goto got_one;
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}
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/* See if there is a static FILE structure available. */
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end = &_RWD_iob[_NFILES];
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for( fp = _RWD_iob; fp < end; ++fp ) {
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if( (fp->_flag & (_READ | _WRITE)) == 0 ) {
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link = lib_malloc( sizeof( __stream_link ) );
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if( link == NULL )
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goto no_mem;
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flags = _READ | _WRITE;
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goto got_one;
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}
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}
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/* Allocate a new dynamic structure */
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flags = _DYNAMIC | _READ | _WRITE;
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link = lib_malloc( sizeof( __stream_link ) + sizeof( FILE ) );
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if( link == NULL )
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goto no_mem;
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fp = (FILE *)(link + 1);
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got_one:
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memset( fp, 0, sizeof( *fp ) );
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fp->_flag = flags;
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link->stream = fp;
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link->stream->_link = link; /* point back to link structure */
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link->next = _RWD_ostream;
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_RWD_ostream = link;
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_ReleaseIOB();
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return( fp );
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no_mem:
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__set_errno( ENOMEM );
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_ReleaseIOB();
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return( NULL ); /* no free slots */
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}
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