/* $NetBSD: wcstok.c,v 1.4 2012/06/25 22:32:46 abs Exp $ */

/*-
* Copyright (c) 1998 Softweyr LLC.  All rights reserved.
*
* strtok_r, from Berkeley strtok
* Oct 13, 1998 by Wes Peters <[email protected]>
*
* Copyright (c) 1988, 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notices, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notices, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by Softweyr LLC, the
*      University of California, Berkeley, and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL SOFTWEYR LLC, THE
* REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Original version ID:
* FreeBSD: src/lib/libc/string/wcstok.c,v 1.1 2002/09/07 08:16:57 tjr Exp
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: wcstok.c,v 1.4 2012/06/25 22:32:46 abs Exp $");
#endif

#include <assert.h>
#include <wchar.h>

wchar_t *
wcstok(wchar_t * __restrict s, const wchar_t * __restrict delim,
   wchar_t ** __restrict last)
{
       const wchar_t *spanp;
       wchar_t c, sc;
       wchar_t *tok;

       /* s may be NULL */
       _DIAGASSERT(delim != NULL);
       _DIAGASSERT(last != NULL);

       if (s == NULL && (s = *last) == NULL)
               return (NULL);

       /*
        * Skip (span) leading delimiters (s += wcsspn(s, delim), sort of).
        */
cont:
       c = *s++;
       for (spanp = delim; (sc = *spanp++) != L'\0';) {
               if (c == sc)
                       goto cont;
       }

       if (c == L'\0') {       /* no non-delimiter characters */
               *last = NULL;
               return (NULL);
       }
       tok = s - 1;

       /*
        * Scan token (scan for delimiters: s += wcscspn(s, delim), sort of).
        * Note that delim must have one NUL; we stop if we see that, too.
        */
       for (;;) {
               c = *s++;
               spanp = delim;
               do {
                       if ((sc = *spanp++) == c) {
                               if (c == L'\0')
                                       s = NULL;
                               else
                                       s[-1] = L'\0';
                               *last = s;
                               return (tok);
                       }
               } while (sc != L'\0');
       }
       /* NOTREACHED */
}