kolibrios/programs/develop/open watcom/trunk/clib/handleio/lseekwnt.c
Sergey Semyonov (Serge) 54786d007d Clib create_file, read_file, write_file: watcom-specific implementation
git-svn-id: svn://kolibrios.org@711 a494cfbc-eb01-0410-851d-a64ba20cac60
2008-02-05 06:08:42 +00:00

83 lines
2.4 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: low level lseek without file extend for Windows NT
*
****************************************************************************/
#include "variety.h"
#include <stdio.h>
#include <unistd.h>
#include "iomode.h"
#include "rtcheck.h"
#include "seterrno.h"
#include "lseek.h"
#include "handleio.h"
#include "kolibri.h"
#ifndef INVALID_SET_FILE_POINTER
#define INVALID_SET_FILE_POINTER 0xFFFFFFFF
#endif
typedef struct
{
char *name;
unsigned int offset;
}__file_handle;
_WCRTLINK long __lseek( int hid, long offset, int origin )
{
__file_handle *fh;
long rc;
__handle_check( hid, -1 );
fh = (__file_handle*) __getOSHandle( hid );
switch(origin)
{
case SEEK_SET:
rc = offset;
break;
case SEEK_CUR:
rc = fh->offset + offset;
break;
case SEEK_END:
{
FILEINFO info;
get_fileinfo(fh->name,&info);
rc = offset + info.size;
break;
}
default:
return -1;
};
fh->offset = rc;
return( rc );
}