Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 548 | serge | 1 | /**************************************************************************** |
| 2 | * |
||
| 3 | * Open Watcom Project |
||
| 4 | * |
||
| 5 | * Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved. |
||
| 6 | * |
||
| 7 | * ======================================================================== |
||
| 8 | * |
||
| 9 | * This file contains Original Code and/or Modifications of Original |
||
| 10 | * Code as defined in and that are subject to the Sybase Open Watcom |
||
| 11 | * Public License version 1.0 (the 'License'). You may not use this file |
||
| 12 | * except in compliance with the License. BY USING THIS FILE YOU AGREE TO |
||
| 13 | * ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is |
||
| 14 | * provided with the Original Code and Modifications, and is also |
||
| 15 | * available at www.sybase.com/developer/opensource. |
||
| 16 | * |
||
| 17 | * The Original Code and all software distributed under the License are |
||
| 18 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
||
| 19 | * EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM |
||
| 20 | * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF |
||
| 21 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR |
||
| 22 | * NON-INFRINGEMENT. Please see the License for the specific language |
||
| 23 | * governing rights and limitations under the License. |
||
| 24 | * |
||
| 25 | * ======================================================================== |
||
| 26 | * |
||
| 27 | * Description: Platform independent __allocfp() implementation. |
||
| 28 | * |
||
| 29 | ****************************************************************************/ |
||
| 30 | |||
| 31 | |||
| 32 | #include "variety.h" |
||
| 33 | #include |
||
| 34 | #include |
||
| 35 | #include |
||
| 36 | #include "liballoc.h" |
||
| 37 | #include "fileacc.h" |
||
| 38 | #include "rtdata.h" |
||
| 39 | #include "seterrno.h" |
||
| 40 | #include "streamio.h" |
||
| 41 | |||
| 42 | |||
| 43 | #define KEEP_FLAGS (_READ | _WRITE | _DYNAMIC) |
||
| 44 | |||
| 45 | FILE *__allocfp( int handle ) |
||
| 46 | { |
||
| 47 | FILE *end; |
||
| 48 | FILE *fp; |
||
| 49 | __stream_link *link; |
||
| 50 | unsigned flags; |
||
| 51 | |||
| 52 | handle = handle; |
||
| 53 | _AccessIOB(); |
||
| 54 | /* Try and take one off the recently closed list */ |
||
| 55 | link = _RWD_cstream; |
||
| 56 | if( link != NULL ) { |
||
| 57 | _RWD_cstream = link->next; |
||
| 58 | fp = link->stream; |
||
| 59 | flags = (fp->_flag & KEEP_FLAGS) | (_READ | _WRITE); |
||
| 60 | goto got_one; |
||
| 61 | } |
||
| 62 | /* See if there is a static FILE structure available. */ |
||
| 63 | end = &_RWD_iob[_NFILES]; |
||
| 64 | for( fp = _RWD_iob; fp < end; ++fp ) { |
||
| 65 | if( (fp->_flag & (_READ | _WRITE)) == 0 ) { |
||
| 66 | link = lib_malloc( sizeof( __stream_link ) ); |
||
| 67 | if( link == NULL ) |
||
| 68 | goto no_mem; |
||
| 69 | flags = _READ | _WRITE; |
||
| 70 | goto got_one; |
||
| 71 | } |
||
| 72 | } |
||
| 73 | /* Allocate a new dynamic structure */ |
||
| 74 | flags = _DYNAMIC | _READ | _WRITE; |
||
| 75 | link = lib_malloc( sizeof( __stream_link ) + sizeof( FILE ) ); |
||
| 76 | if( link == NULL ) |
||
| 77 | goto no_mem; |
||
| 78 | fp = (FILE *)(link + 1); |
||
| 79 | got_one: |
||
| 80 | memset( fp, 0, sizeof( *fp ) ); |
||
| 81 | fp->_flag = flags; |
||
| 82 | link->stream = fp; |
||
| 83 | link->stream->_link = link; /* point back to link structure */ |
||
| 84 | link->next = _RWD_ostream; |
||
| 85 | _RWD_ostream = link; |
||
| 86 | _ReleaseIOB(); |
||
| 87 | return( fp ); |
||
| 88 | no_mem: |
||
| 89 | __set_errno( ENOMEM ); |
||
| 90 | _ReleaseIOB(); |
||
| 91 | return( NULL ); /* no free slots */ |
||
| 92 | } |