getchos2.c

开放源码的编译器open watcom 1.6.0版的源代码

/****************************************************************************
*
*                            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 "variety.h"
#include <stdio.h>
#include <stdlib.h>
#define INCL_16
#define INCL_SUB
#include <wos2.h>
#include <conio.h>
#include "rtdata.h"
#include "defwin.h"

#if defined(__OS2_286__)
    extern  unsigned char _dos(char);
    #pragma aux _dos = 0xcd 0x21 /* int 21h */ parm caller [ah] value [al];
#endif

_WCRTLINK int getch()
    {
        char c;

        if( ( c = _RWD_cbyte ) != 0 ) {
            _RWD_cbyte = 0;
            return( c );
        }
#ifdef DEFAULT_WINDOWING
        if( _WindowsGetch != 0 ) {      // Default windowing
            LPWDATA     res;
            res = _WindowsIsWindowedHandle( (int) STDIN_FILENO );
            return( _WindowsGetch( res ) );
        }
#endif
        #if defined(__OS2_286__)
            if( _RWD_osmode == DOS_MODE ) {
                return( _dos( 8 ) );
            }
        #endif
        if( ( c = _RWD_cbyte2 ) != 0 ) {
            _RWD_cbyte2 = 0;
            return( c );
        }
        {
            APIRET     rc;
            KBDKEYINFO info;

            rc = KbdCharIn( &info, 0, 0 );
            if( rc == ERROR_KBD_DETACHED ) {
                return( EOF );
            } else if( info.chChar == 0 || info.chChar == 0xe0 ) {
                _RWD_cbyte2 = info.chScan;
            }
            return( info.chChar );
        }
    }