jstrrchr.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

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


/**
*
*  Name:        jstrrchr        暥帤傪専嶕偡傞
*
*  Synopsis:    p = jstrrchr( s, c );
*
*               JSTRING p;      暥帤偺億僀儞僞
*               JSTRING s;      暥帤楍
*               JMOJI c;        暥帤
*
*  Description: 暥帤楍倱傪弴偵専嶕偟丄嵟弶偵暥帤們偲堦抳偟偨
*               埵抲偺億僀儞僞傪曉偡丅倞倱倲倰們倛倰偼愭摢偐傜
*               専嶕偟丄倞倱倲倰倰們倛倰偼嵟屻偐傜専嶕偡傞丅
*
*  Returns:     堦抳偑側偐偭偨応崌偼僰儖億僀儞僞傪曉偡丅
*
*
*  Name:        jstrrchr        search out specified letter from the string
*
*  Synopsis:    p = jstrrchr( s, c );
*
*               JSTRING p;      return value which point to the searched out
*                               letter
*               JSTRING s;      pointer to the string which is referenced
*               JMOJI   c;      the value of searching letter
*
*  Description: The jstrrchr function locates the final occurrence of "c"
*               in the string pointed to by "s". Jstrrchr function start to
*               search out from the end of string, and jstrchr function
*               start to search out from the top of string.
*               If you specify "c" with KANJI letter, JMOJI consist with 16
*               bit and its' high byte consist with first byte code of KANJI
*               letter, and low byte consist with second byte code of KANJI
*               letter. If second byte code is NULL then the first byte code
*               also consider to NULL. If you specify "c" with 1 byte character
*               then, it must be in the low byte of JMOJI and the high byte of
*               JMOJI has to NULL.
*
*  Returns:     This function returns a pointer to the located letter, or NULL
*               if the letter does not occur in the string.
*
**/


_WCRTLINK JSTRING jstrrchr( const JCHAR *s, JMOJI c )
{
    const JCHAR *p, *ss;
    JMOJI cc;

    p = (JSTRING)NULL;
    while( 1 ) {
        ss = jgetmoji( s, &cc );
        if( cc == 0 ) break;
        if( cc == c ) p = s;
        s = ss;
    }
    return( (JSTRING) p );
}