106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
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/****************************************************************************
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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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* Description: low level lseek without file extend for Windows NT
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*
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****************************************************************************/
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#include "variety.h"
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#include <stdio.h>
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#include <unistd.h>
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#include "iomode.h"
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#include "rtcheck.h"
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#include "seterrno.h"
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#include "lseek.h"
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#include "handleio.h"
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/*
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DWORD SetFilePointer(
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HANDLE hFile, // handle to file
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LONG lDistanceToMove, // bytes to move pointer
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PLONG lpDistanceToMoveHigh, // bytes to move pointer
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DWORD dwMoveMethod // starting point
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);
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*/
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#ifndef INVALID_SET_FILE_POINTER
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#define INVALID_SET_FILE_POINTER 0xFFFFFFFF
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#endif
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typedef struct
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{
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char *name;
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unsigned int offset;
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}__file_handle;
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typedef struct
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{ DWORD attr;
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DWORD flags;
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DWORD cr_time;
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DWORD cr_date;
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DWORD acc_time;
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DWORD acc_date;
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DWORD mod_time;
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DWORD mod_date;
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DWORD size;
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DWORD size_high;
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} FILEINFO;
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int _stdcall get_fileinfo(const char *name,FILEINFO* pinfo);
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_WCRTLINK long __lseek( int hid, long offset, int origin )
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{
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__file_handle *fh;
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long rc;
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__handle_check( hid, -1 );
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fh = (__file_handle*) __getOSHandle( hid );
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switch(origin)
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{
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case SEEK_SET:
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rc = offset;
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break;
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case SEEK_CUR:
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rc = fh->offset + offset;
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break;
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case SEEK_END:
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{
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FILEINFO info;
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get_fileinfo(fh->name,&info);
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rc = offset + info.size;
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break;
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}
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default:
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return -1;
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};
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fh->offset = rc;
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return( rc );
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}
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