/****************************************************************************
*
*                            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:  rename function for RDOS
*
****************************************************************************/


#include "variety.h"
#include "widechar.h"
#include <stdio.h>
#include <rdos.h>
#include <errno.h>
#include "liballoc.h"
#include "seterrno.h"

_WCRTLINK int rename( const CHAR_TYPE *old, const CHAR_TYPE *new )
{
    int src;
    int dst;
    int attrib;
    unsigned long msb;
    unsigned long lsb;
    int ok;
    char *buf;
    int rdsize;
    int wrsize;

    dst = RdosOpenFile( new, 0 );
    if ( dst ) {
        __set_errno( EEXIST );
        RdosCloseFile( dst );
        return( -1 );
    }

    if( RdosGetFileAttribute( old, &attrib ) )
    {
        src = RdosOpenFile( old, 0 );
        dst = RdosCreateFile( new, attrib );

        ok = 1;    
        buf = (char*) lib_malloc( sizeof( 0x1000 ) );

        rdsize = RdosReadFile( src, buf, 0x1000 );

        while( ok && rdsize ) {
            wrsize = RdosWriteFile( dst, buf, 0x1000 );

            if( rdsize == wrsize )
                rdsize = RdosReadFile( src, buf, 0x1000 );
            else
                ok = 0;
        }

        if( ok ) {
            RdosGetFileTime( src, &msb, &lsb );
            RdosSetFileTime( dst, msb, lsb );
            RdosCloseFile( src );
            RdosCloseFile( dst );
            RdosDeleteFile( old );
        }
        else {
            RdosCloseFile( src );
            RdosCloseFile( dst );
        }
        
        lib_free( buf );        

        if( ok )
            return( 0 );
    }

    __set_errno( ENOENT );
    return( -1 );
}
