mtob.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 76 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
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*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
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****************************************************************************/


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


/**
*
*  Name:        mtob
*
*  Synopsis:    nb = mtob( s, nm );
*
*               int nb;         僶僀僩悢
*               JSTRING s;      暥帤楍
*               int nm;         暥帤悢
*
*  Description: 暥帤楍倱偺愭摢偐傜値倣偱巜掕偟偨暥帤悢偺娫偵偁傞僶僀僩悢
*               傪曉偡丅娍帤僐乕僪偼俀僶僀僩偱侾暥帤偲悢偊傞丅
*
*  Name:        mtob
*
*  Synopsis:    nb = mtob( s, nm );
*
*               int nb;         Length of string s (Unit:byte)
*               JSTRING s;      String
*               int nm;         The number of character
*
*  Description: Return the length of the string s by byte from the head of s
*               to the nm th character. Two bytes of KANJI code is treated as
*               one character.
*
**/

_WCRTLINK size_t mtob( const JCHAR *s, size_t nm )
{
    const JCHAR *ss;
    JMOJI m;

    ss = s;
    while( nm-- ) {
        ss = jgetmoji( ss, &m );
        if( m == 0 ) break;
    }
    return( ss - s );
}