kolibrios/programs/develop/open watcom/trunk/clib/string/fstrtok.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
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*  ========================================================================
*
* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/


#include "variety.h"
#include <stdio.h>
#include <string.h>
#include "rtdata.h"
#include "nextftok.h"
#include "setbits.h"


_WCRTLINK char _WCFAR *_fstrtok( char _WCFAR *str, const char _WCFAR *charset )
{
    unsigned /*char*/ tc;
    unsigned char vector[32];
    unsigned char _WCFAR *p1;

    _INITNEXTFTOK
    if( str == NULL ) {
        str = _RWD_nextftok;            /* use previous value   */
        if( str == NULL ) return( NULL );
    }
    __fsetbits( vector, charset );
    for( ; tc = (unsigned char) *str; ++str ) {
        /* quit if we find any char not in charset */
        if( ( vector[ tc >> 3 ] & _Bits[ tc & 0x07 ] ) == 0 )  break;
    }
    if( tc == '\0' ) return( NULL );
    p1 = str;
    for( ; tc = *p1; ++p1 ) {
        /* quit when we find any char in charset */
        if( ( vector[ tc >> 3 ] & _Bits[ tc & 0x07 ] ) != 0 ) {
            *p1 = '\0';             /* terminate the token  */
            p1++;                   /* start of next token  */
            _RWD_nextftok = p1;
            return( str );
        }
    }
    _RWD_nextftok = NULL;
    return( str );
}