jstrspn.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 87 行

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*
*                            Open Watcom Project
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****************************************************************************/


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

/**
*
*  Name:        jstrspn
*
*  Synopsis:    unsigned int jstrspn( JSTRING str1, JSTRING str2 );
*
*               JSTRING str1;   僒乕僠偝傟傞暥帤楍
*               JSTRING str2;   str1 偺拞偐傜僒乕僠偡傞暥帤偺廤崌
*               unsigned ret;   str2 偱巜掕偟偨暥帤偵堦抳偟側偄嵟弶偺暥帤傪
*                               巜偡僀儞僨僢僋僗
*
*  Description: jstrspn 娭悢偼, 暥帤楍 str1 偺拞偐傜丄暥帤楍 str2 偱巜掕偟偨
*               暥帤楍拞偺偄偢傟偺暥帤偲傕堦抳偟側偄丄嵟弶偺暥帤傪巜偡
*               僀儞僨僢僋僗傪曉偟傑偡丅str1 偺愭摢偐傜栠傝抣偑帵偡僶僀僩悢暘
*               偼丄str2 偱巜掕偟偨暥帤楍拞偺暥帤偩偗偱峔惉偝傟偰偄傞偙偲傪
*               堄枴偟傑偡丅str1 偑 str2 偱巜掕偟偨暥帤埲奜偱巒傑偭偰偄傞
*               偲偒偼丄0 傪曉偟傑偡丅
*
*  Name:        jstrspn
*
*  Synopsis:    ret = jstrspn( str1, str2 );
*
*               JSTRING str1;   2-byte KANJI string
*               JSTRING str2;   2-byte KANJI characters
*               unsigned ret;   Index to the first character in string str1
*                               which does not consist of string str2.
*
*  Description: Jstrspn function returns the index to the first character in
*               the string str1 which is not included in the string str2.
*               In the other words, The string from the head of the string
*               str1 through the ret bytes is consists of the characters in
*               the string str2.
*
*  Return:      If the string str1 starts with a character which is not
*               included in the string str2, this function returns 0.
*
**/

_WCRTLINK size_t jstrspn( const JCHAR *str1, const JCHAR *str2 )
{
    const JCHAR *s1, *next_s1, *s2;
    JMOJI c1, c2;

    for( s1 = str1; next_s1 = jgetmoji( s1, &c1 ), c1; s1 = next_s1) {
        for( s2 = str2;
            ( s2 = jgetmoji( s2, &c2 ), c2 ) && ( c1 != c2 );
                );
        if( !c2 ) break;
    }
    return ( s1 - str1 );
}