360 lines
10 KiB
C
360 lines
10 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 fopen() implementation.
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*
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****************************************************************************/
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#include "variety.h"
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#include "widechar.h"
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#include <stdio.h>
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#include <ctype.h>
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#ifdef __WIDECHAR__
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#include <wctype.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include "fileacc.h"
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#include "fmode.h"
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#include "openmode.h"
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#include "rtdata.h"
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#include "seterrno.h"
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//#include "defwin.h"
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#include "streamio.h"
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#ifdef __UNIX__
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#define PMODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)
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#else
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#define PMODE (S_IREAD | S_IWRITE)
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#endif
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int __F_NAME(__open_flags,__wopen_flags)( const CHAR_TYPE *modestr, int *extflags )
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{
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int flags;
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int alive = 1;
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int gotplus = 0;
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int gottextbin = 0;
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#ifndef __NETWARE__
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int gotcommit = 0;
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#endif
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flags = 0;
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if( extflags != NULL ) {
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#ifdef __NETWARE__
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*extflags = 0;
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#else
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if( _commode == _COMMIT ) {
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*extflags = _COMMIT;
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} else {
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*extflags = 0;
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}
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#endif
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}
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/*
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* The first character in modestr must be 'r', 'w', or 'a'.
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*/
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switch( *modestr ) {
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case 'r':
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flags |= _READ;
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break;
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case 'w':
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flags |= _WRITE;
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break;
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case 'a':
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flags |= _WRITE | _APPEND;
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break;
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default:
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__set_errno( EINVAL );
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return( 0 );
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}
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modestr++;
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/*
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* Next we might have, in any order, some additional mode modifier
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* characters:
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* 1. A '+' character.
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* 2. Either a 't' or a 'b'.
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* 3. Either a 'c' or a 'n'. (Not available for Netware.)
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* For MS compatability, scanning stops when any of the three groups
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* is encountered twice; e.g., "wct+b$&!" is valid and will result in
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* a text, not binary, stream. Also for MS compatability, scanning
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* stops at any unrecognized character, without causing failure.
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*/
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while( (*modestr != NULLCHAR) && alive ) {
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switch( *modestr ) {
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case '+':
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if( gotplus ) {
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alive = 0;
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} else {
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flags |= _READ | _WRITE;
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gotplus = 1;
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}
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break;
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case 't':
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if( gottextbin ) {
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alive = 0;
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} else {
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gottextbin = 1;
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}
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break;
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case 'b':
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if( gottextbin ) {
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alive = 0;
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} else {
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#ifndef __UNIX__
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flags |= _BINARY;
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#endif
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gottextbin = 1;
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}
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break;
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#ifndef __NETWARE__
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case 'c':
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if( gotcommit ) {
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alive = 0;
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} else {
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*extflags |= _COMMIT;
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gotcommit = 1;
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}
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break;
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case 'n':
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if( gotcommit ) {
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alive = 0;
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} else {
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*extflags &= ~_COMMIT;
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gotcommit = 1;
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}
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break;
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#endif
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default:
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break;
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}
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modestr++;
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}
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/*
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* Handle defaults for any unspecified options.
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*/
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#ifndef __UNIX__
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if( !gottextbin ) {
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if( _RWD_fmode == O_BINARY ) flags |= _BINARY;
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}
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#endif
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return( flags );
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}
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static FILE *__F_NAME(__doopen,__wdoopen)( const CHAR_TYPE *name,
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CHAR_TYPE mode,
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int file_flags,
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int extflags,
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int shflag, /* sharing flag */
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FILE * fp )
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{
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int open_mode;
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int p_mode;
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SetupTGCSandNCS( RETURN_ARG( FILE *, 0 ) ); /* for NW386 */
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fp->_flag &= ~(_READ | _WRITE);
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fp->_flag |= file_flags;
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/* we need the mode character to indicate if the original */
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/* intention is to open for read or for write */
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mode = __F_NAME(tolower,towlower)( mode );
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if( mode == 'r' ) {
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open_mode = O_RDONLY;
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if( file_flags & _WRITE ) { /* if "r+" mode */
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open_mode = O_RDWR;
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}
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#if defined( __NETWARE__ )
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open_mode |= O_BINARY;
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#elif defined( __UNIX__ )
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#else
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if( file_flags & _BINARY ) {
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open_mode |= O_BINARY;
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} else {
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open_mode |= O_TEXT;
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}
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#endif
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p_mode = 0;
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} else { /* mode == 'w' || mode == 'a' */
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if( file_flags & _READ ) { /* if "a+" or "w+" mode */
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open_mode = O_RDWR | O_CREAT;
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} else {
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open_mode = O_WRONLY | O_CREAT;
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}
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if( file_flags & _APPEND ) {
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open_mode |= O_APPEND;
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} else { /* mode == 'w' */
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open_mode |= O_TRUNC;
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}
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#if defined( __NETWARE__ )
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open_mode |= O_BINARY;
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#elif defined( __UNIX__ )
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#else
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if( file_flags & _BINARY ) {
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open_mode |= O_BINARY;
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} else {
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open_mode |= O_TEXT;
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}
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#endif
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p_mode = PMODE;
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}
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fp->_handle = __F_NAME(sopen,_wsopen)( name, open_mode, shflag, p_mode );
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if( fp->_handle == -1 ) {
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// since we couldn't open the file, release the FILE struct
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__freefp( fp );
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return( NULL );
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}
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fp->_cnt = 0;
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fp->_bufsize = 0; /* was BUFSIZ JBS 31-may-91 */
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#ifndef __NETWARE__
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_FP_ORIENTATION(fp) = _NOT_ORIENTED; /* initial orientation */
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_FP_EXTFLAGS(fp) = extflags;
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#endif
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#if defined( __NT__ ) || defined( __OS2__ )
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_FP_PIPEDATA(fp).isPipe = 0; /* not a pipe */
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#endif
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_FP_BASE(fp) = NULL;
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if( file_flags & _APPEND ) {
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fseek( fp, 0L, SEEK_END );
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}
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__chktty( fp ); /* JBS 28-aug-90 */
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return( fp );
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}
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_WCRTLINK FILE *__F_NAME(_fsopen,_wfsopen)( const CHAR_TYPE *name,
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const CHAR_TYPE *access_mode, int shflag )
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{
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FILE * fp;
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int file_flags;
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int extflags;
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/* validate access_mode */
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file_flags = __F_NAME(__open_flags,__wopen_flags)( access_mode, &extflags );
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if( file_flags == 0 ) {
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return( NULL );
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}
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/* specify dummy handle 0 */
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fp = __allocfp( 0 ); /* JBS 30-aug-91 */
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if( fp != NULL ) {
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fp = __F_NAME(__doopen,__wdoopen)( name, *access_mode,
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file_flags, extflags,
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shflag, fp );
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}
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return( fp );
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}
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_WCRTLINK FILE *__F_NAME(fopen,_wfopen)( const CHAR_TYPE *name, const CHAR_TYPE *access_mode )
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{
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return( __F_NAME(_fsopen,_wfsopen)( name, access_mode, OPENMODE_DENY_COMPAT ) );
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}
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static FILE *close_file( FILE *fp )
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{
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__stream_link * link;
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__stream_link **owner;
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_AccessIOB();
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/* See if the file pointer is a currently open file. */
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link = _RWD_ostream;
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for( ;; ) {
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if( link == NULL ) break;
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if( link->stream == fp ) {
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if( fp->_flag & (_READ|_WRITE) ) {
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__doclose( fp, 1 );
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}
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_ReleaseIOB();
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return( fp );
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}
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link = link->next;
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}
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/*
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It's not on the list of open files, so check the list of
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recently closed ones.
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*/
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owner = &_RWD_cstream;
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for( ;; ) {
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link = *owner;
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if( link == NULL ) break;
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if( link->stream == fp ) {
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/* remove from closed list and put on open */
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*owner = link->next;
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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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}
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owner = &link->next;
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}
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/* We ain't seen that file pointer ever. Leave things be. */
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__set_errno( EBADF );
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_ReleaseIOB();
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return( NULL );
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}
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_WCRTLINK FILE *__F_NAME(freopen,_wfreopen)( const CHAR_TYPE *name,
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const CHAR_TYPE *access_mode, FILE *fp )
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{
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int hdl;
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int file_flags;
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int extflags;
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_ValidFile( fp, 0 );
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/* validate access_mode */
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file_flags = __F_NAME(__open_flags,__wopen_flags)( access_mode, &extflags );
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if( file_flags == 0 ) {
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return( NULL );
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}
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hdl = fileno( fp );
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_AccessFileH( hdl );
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#ifdef DEFAULT_WINDOWING
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if( _WindowsRemoveWindowedHandle != 0 ) {
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_WindowsRemoveWindowedHandle( hdl );
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}
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#endif
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fp = close_file( fp );
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if( fp != NULL ) {
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fp->_flag &= _DYNAMIC; /* 24-jul-92 */
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fp = __F_NAME(__doopen,__wdoopen)( name, *access_mode,
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file_flags, extflags,
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0, fp );
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}
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_ReleaseFileH( hdl );
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return( fp );
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}
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