kolibrios-gitea/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
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


#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 );
}