jmstojis.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 59 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:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/


#include "variety.h"
#include <jstring.h>
#include <mbstring.h>



_WCRTLINK unsigned int _mbcjmstojis( unsigned int ch )
{
    return( jmstojis( ch ) );
}


_WCRTLINK unsigned short jmstojis( unsigned short msc )
{
    unsigned char u, l;

    if( !jiszen( msc ) ) return 0;

    l = msc;
    u = msc >> 8;

    u = (u - ((u < 0xa0) ? 0x71 : 0xb1)) * 2 + ((l >= 0x9f) ? 2 : 1);
    l -= (l >= 0x7f) ? ((l < 0x9f) ? 0x20 : 0x7e) : 0x1f;

    return( ( (unsigned short)u << 8 ) + l );
}