jistojms.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 97 行

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*
*                            Open Watcom Project
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*    This file contains Original Code and/or Modifications of Original
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#include "variety.h"
#include <jstring.h>
#include <mbstring.h>

/**
*
*  Name:        jistojms                JIS僐乕僪傪僔僼僩JIS僐乕僪偵曄姺
*               jmstojis                僔僼僩JIS僐乕僪傪JIS僐乕僪偵曄姺
*
*  Synopsis:    sc = jistojms( jc );
*               jc = jmstojis( sc );
*
*               unsigned short sc;      僔僼僩JIS僐乕僪
*               unsigned short jc;      JIS僐乕僪
*
*  Description: jistojms 娭悢偼丄JIS僐乕僪傪僔僼僩JIS僐乕僪偵曄姺偡傞丅
*               jmstojis 娭悢偼丄僔僼僩JIS僐乕僪傪JIS僐乕僪偵曄姺偡傞丅
*               堷悢偑斖埻奜偺応崌丄0 傪曉偡丅
*
*
*  Name:        jistojms                Convert JIS code to shift-JIS code
*               jmstojis                Convert shift-JIS code to JIS code
*
*  Synopsis:    ret = jistojms( c );
*               ret = jmstojis( c);
*
*               unsigned short sc;      Shift-JIS code
*               unsigned short jc;      JIS code
*
*  Description: Jistomsj converts JIS code to shift-JIS code and msjtojis
*               converts shift-JIS code to JIS code. If argument is out of
*               range, they return 0.
*
*  Note:        JIS code is a kind of KANJI character set. It is defined
*               by JIS, Japan Industrial Standard Institutes. Shift-JIS is
*               another KANJI character set. It is defined by Microsoft for
*               MS-DOS which is based on JIS code. The first byte and the
*               second byte of JIS code are less than 0x80. Microsoft has
*               designed shift-JIS code can be mixed in string with
*               alpha-numeric. Thus shift-JIS code is more than or equal to
*               0x8140.
*
**/

_WCRTLINK unsigned int _mbcjistojms( unsigned int ch )
{
    return( jistojms( ch ) );
}


_WCRTLINK unsigned short jistojms( unsigned short c )
{
    unsigned char u, l;

    l = c;
    u = c >> 8;

    if( u < 0x21 || u > 0x7e || l < 0x21 || l >0x7e ) return 0;

    l += (u % 2) ? ((l < 0x60) ? 0x1f : 0x20) : 0x7e;
    u = (u - 1) / 2 + ((u < 0x5f) ? 0x71 : 0xb1);

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