lseekos2.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 57 行

/****************************************************************************
*
*                            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 OS/2.
*
****************************************************************************/


#include "variety.h"
#include <stdio.h>
#include <unistd.h>
#include "fileacc.h"
#include <wos2.h>
#include "rtcheck.h"
#include "seterrno.h"
#include "lseek.h"


_WCRTLINK long __lseek( int handle, long offset, int origin )
{
    APIRET          rc;
    long            out_offset;

    __handle_check( handle, -1 );

    rc = DosChgFilePtr( handle, offset, origin, (PULONG)&out_offset );
    if( rc != 0 ) {
        __set_errno_dos( rc );
        out_offset = -1;
    }

    return( out_offset );  /* return seek position */
}