swchar.c

Open Watcom 的 C 编译器源代码

/****************************************************************************
*
*                            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:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/


#include "target.h"

#if _OS == _DOS
extern  unsigned char    _DOS_Switch_Char();

#pragma aux     _DOS_Switch_Char = \
                        0x52            /* push dx */\
                        0xb4 0x37       /* mov ah,37h    */\
                        0xb0 0x00       /* mov al,00h    */\
                        0xcd 0x21       /* int 21h       */\
                        0x88 0xd0       /* mov al,dl     */\
                        0x5a            /* pop dx        */;
#endif

unsigned char _dos_switch_char()
    {
#if _OS == _DOS
#if !defined(__WINDOWS_386__)
        return( _DOS_Switch_Char() );
#else
        return( '/' );
#endif

#elif _OS == _NT
        return( '/' );
#elif _OS == _OS2
        return( '/' );
#elif _OS == _QNX
        return( '-' );
#elif _OS == _LINUX
        return( '-' );
#endif
    }