strpbrk.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
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*  ========================================================================
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*    This file contains Original Code and/or Modifications of Original
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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#include "variety.h"
#include "widechar.h"
#include <stddef.h>
#include <string.h>
#include "setbits.h"

/*  The strpbrk function locates the first occurrence in the string pointed
    to by str of any character from the string pointed to by charset.
*/


_WCRTLINK CHAR_TYPE *__F_NAME(strpbrk,wcspbrk) ( const CHAR_TYPE *str, const CHAR_TYPE *charset )
{
#if defined(__WIDECHAR__)

    const CHAR_TYPE             *p1;
    const CHAR_TYPE             *p2;
    CHAR_TYPE           tc1;
    CHAR_TYPE           tc2;
    size_t              len;

    len = 0;
    for( p1 = str; tc1 = *p1; p1++, len++ ) {
        for( p2 = charset; tc2 = *p2; p2++ ) {
            if( tc1 == tc2 ) break;
        }
        if( tc2 != NULLCHAR ) return( (CHAR_TYPE *)p1 );
    }
    return( NULL );

#else
    unsigned char tc;
    unsigned char vector[32];

    __setbits( vector, charset );
    for( ; tc = *str; ++str ) {
        /* quit when we find any char in charset */
        if( ( vector[ tc >> 3 ] & _Bits[ tc & 0x07 ] ) != 0 )
             return( (char *)str );
    }
    return( NULL );
#endif
}