| 0,0 → 1,92 |
|---|
| /**************************************************************************** |
| * |
| * 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 */ |
| } |