swchar.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 55 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:  get switch char function
*
****************************************************************************/


#include "swchar.h"

#ifdef __DOS__

extern unsigned char    _DOS_Switch_Char( void );
#pragma aux     _DOS_Switch_Char = \
    "mov ax,3700h"  \
    "int 21h"       \
    "mov al,dl"     \
    modify [dx];

#endif

unsigned char _dos_switch_char( void )
{
#ifdef __DOS__
    return( _DOS_Switch_Char() );
#elif defined( __UNIX__ )
    return( '-' );
#else
    return( '/' );
#endif
}