jstrnicm.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 95 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>
#include <jctype.h>
#include <ctype.h>
/**
*
*  Name:        jstrnicmp
*
*  Synopsis:    x = jstrnicmp( a, b, n );
*
*               int x;          寢壥
*               JSTRING a, b;   暥帤楍
*               int n;          暥帤悢
*
*  Description: 俀偮偺暥帤楍傪斾妑偡傞丅倞倱倲倰値們倣倫偼愭摢偐傜
*               値暥帤暘偺傒偺斾妑傪偡傞丅
*               俙俶俲暥帤丂亙丂僇僫暥帤丂亙丂娍帤暥帤丂偺戝彫娭學偵
*               偵側偭偰偄傞丅
*
*  Returns:     暥帤楍倎偺曽偑倐傛傝傕彫偝偄応崌偼晧悢傪丄戝偒偄応崌
*               偼惓悢傪曉偟丄倎偲倐偑摍偟偄偲偒偼侽傪曉偡丅
*
*
*  Name:        jstrnicmp
*
*  Synopsis:    x = jstrnicmp( a, b, n );
*
*               int x;          Result
*               JSTRING a, b;   Compared strings
*               int n;          Compared number of characters
*
*  Description: Compare two strings ignoring case in n bytes. All ASCII
*               characters are less than any 1-byte KATAKANA chracters.
*               All 1-byte KATAKANA charaters are less than any 2-byte
*               KANJI charaters.
*
*  Returns:     If the string a is less than the sring b, jstrnicmp returns
*               negative value, if a is greater than b, it returns positive.
*               If a is equal to b, it returns 0.
*
**/

_WCRTLINK int jstrnicmp( const JCHAR *a, const JCHAR *b, size_t n )
{
    JMOJI aa, bb;

    while( n-- ) {
        a = jgetmoji( a, &aa );
        if( jiszen( aa ) )
            aa = jtoupper( aa );
        else
            aa = toupper( aa );
        b = jgetmoji( b, &bb );
        if( jiszen( bb ) )
            bb = jtoupper( bb );
        else
            bb = toupper( bb );
        if( aa != bb ) return( ( aa < bb ) ? -1 : 1 );
        if( aa == 0 ) break;
    }
    return( 0 );
}