kolibrios-fun/programs/develop/open watcom/trunk/clib/string/fstrcspn.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
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/


#include "variety.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 _fstrcspn( const char _WCFAR *str, const char _WCFAR *charset )
{
    unsigned /*char*/ tc;
    unsigned char vector[32];
    size_t len;

    __fsetbits( 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 );
}