kolibrios-fun/programs/develop/open watcom/trunk/clib/string/strcspn.c

/****************************************************************************
*
*                            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
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
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*  ========================================================================
*
* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/


#include "variety.h"
#include "widechar.h"
#include <stddef.h>
#include <string.h>
#include "setbits.h"

/*  The strcspn function computes the length of the initial segment of the
    string pointed to by str which consists entirely of characters not from
    the string pointed to by charset. The terminating NULL character is not
    considered part of charset.
*/


_WCRTLINK size_t __F_NAME(strcspn,wcscspn) ( 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 ) break;
    }
    return( len );

#else
    unsigned /*char*/ tc;
    unsigned char vector[32];
    size_t len;

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