jstrstr.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
*    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
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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 <string.h>
#include <jstring.h>

/**
*
*  Name:        jstrstr         暥帤楍偐傜偺偁傞暥帤楍偺僒乕僠
*
*  Synopsis:    s3 = jstrstr( s1, s2 );
*
*               JSTRING s1;     僒乕僠偝傟傞暥帤楍
*               JSTRING s2;     string1偺拞偐傜尒偮偗偨偄暥帤楍
*               JSTRING s3;     string1偺拞偱尒偮偗傜傟偨暥帤楍
*
*  Description: 暥帤楍 s1 偺拞偐傜暥帤楍 s2 傪憑偟丄尒偮偗傜傟偨暥帤楍傊偺
*               億僀儞僞傪曉偟傑偡丅尒偮偐傜側偐偭偨応崌偵偼丄僰儖億僀儞僞傪
*               曉偟傑偡丅
*
*  Name:        jstrstr         Search a substring in a string
*
*  Synopsis:    s3 = jstrstr( s1, s2 );
*
*               JSTRING s1;     2-byte KANJI string
*               JSTRING s2;     2-byte KANJI substring
*               JSTRING s3;     Ponter to found string
*
*  Description: The jstrstr function locate the first occurrence in the 2-byte
*               KANJI string pointed to by s1 of sequence of characters
*               (excluding the terminating null character) un the 2-byte KANJI
*               string pointed to s2.
*
*  Return:      The jstrstr function returns a pointer to the located 2-byte
*               KANJI string, or NULL if the string is not found.
*
**/

_WCRTLINK JSTRING jstrstr( const JCHAR *s1, const JCHAR *s2 )
{
    JMOJI c1, c2;
    const JCHAR *sp2, *n;

    sp2 = jgetmoji( s2, &c2 );
    if( c2 == '\0' ) return( (JSTRING) s1 );
loop1:
    n = s1;
    s1 = jgetmoji( s1, &c1 );
    if ( c1 == '\0' ) return( (JSTRING) NULL );
loop1a:
    if( c1 != c2 ) {
        goto loop1;
    } else {
loop2:
        s1 = jgetmoji( s1, &c1 );
        sp2 = jgetmoji( sp2, &c2 );
        if( c2 == '\0' ) return( (JSTRING) n );
        if( c1 == '\0' ) return( (JSTRING) NULL );
        if ( c2 == c1 ) goto loop2;
        s1 = jgetmoji( ++n, &c1 );
        sp2 = jgetmoji( s2, &c2 );
        goto loop1a;
    }
}