kolibrios-gitea/programs/develop/open watcom/trunk/clib/streamio/fdopen.c

145 lines
4.3 KiB
C
Raw Normal View History

/****************************************************************************
*
* 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 fdopen() implementation.
*
****************************************************************************/
#include "variety.h"
#include "widechar.h"
#include <stdio.h>
#include <ctype.h>
#ifdef __WIDECHAR__
#include <wctype.h>
#endif
#include <errno.h>
#include <fcntl.h>
#ifdef __NT__
#include <windows.h>
#endif
#include "iomode.h"
#include "rtdata.h"
#include "seterrno.h"
#include "streamio.h"
extern int __F_NAME(__open_flags,__wopen_flags)( const CHAR_TYPE *, int * );
#ifndef __NETWARE__
static int __iomode( int handle, int amode )
{
int flags;
int __errno;
#ifdef __UNIX__
if( (flags = fcntl( handle, F_GETFL )) == -1 ) {
return( -1 );
}
__errno = EOK;
if( (flags & O_APPEND) && !(amode & _APPEND) ) {
__errno = EACCES;
}
if( (flags & O_ACCMODE) == O_RDONLY ) {
if( amode & _WRITE ) {
__errno = EACCES;
}
} else if( (flags & O_ACCMODE) == O_WRONLY ) {
if( amode & _READ ) {
__errno = EACCES;
}
}
#else
/* make sure the handle has the same text/binary mode */
flags = __GetIOMode( handle );
__errno = 0;
if( (amode ^ flags) & (_BINARY | _APPEND) ) {
__errno = EACCES;
}
if( ( amode & _READ ) && !(flags & _READ) ) {
__errno = EACCES;
}
if( ( amode & _WRITE ) && !(flags & _WRITE) ) {
__errno = EACCES;
}
#endif
if( __errno == EACCES ) {
__set_errno( __errno );
return( -1 );
}
return( 0 );
}
#endif
_WCRTLINK FILE *__F_NAME(fdopen,_wfdopen)( int handle, const CHAR_TYPE *access_mode )
{
unsigned flags;
FILE *fp;
int extflags;
if( handle == -1 ) {
__set_errno( EBADF ); /* 5-dec-90 */
return( NULL ); /* 19-apr-90 */
}
flags = __F_NAME(__open_flags,__wopen_flags)( access_mode, &extflags );
if( flags == 0 ) return( NULL );
#ifndef __NETWARE__
/* make sure the handle has the same text/binary mode */
if( __iomode( handle, flags ) == -1 ) {
return( NULL );
}
#endif
fp = __allocfp( handle ); /* JBS 30-aug-91 */
if( fp ) {
fp->_flag &= ~(_READ | _WRITE); /* 2-dec-90 */
fp->_flag |= flags;
fp->_cnt = 0;
_FP_BASE(fp) = NULL;
fp->_bufsize = 0; /* was BUFSIZ JBS 91/05/31 */
#ifndef __NETWARE__
_FP_ORIENTATION(fp) = _NOT_ORIENTED; /* initial orientation */
_FP_EXTFLAGS(fp) = extflags;
#endif
#if defined( __NT__ ) || defined( __OS2__ )
_FP_PIPEDATA(fp).isPipe = 0; /* not a pipe */
#endif
fp->_handle = handle; /* BJS 91-07-23 */
if( __F_NAME(tolower,towlower)( *access_mode ) == 'a' ) {
fseek( fp, 0, SEEK_END );
}
__chktty( fp ); /* JBS 31-may-91 */
#if !defined( __UNIX__ ) && !defined( __NETWARE__ )
__SetIOMode( handle, flags );
#endif
}
return( fp );
}