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