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/*        $NetBSD: strtok_r.c,v 1.9 2003/08/07 16:43:53 agc Exp $        */

/*

 * Copyright (c) 1988 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

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. 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 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 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.

 */

#include <sys/cdefs.h>

#include <string.h>

char *

strtok_r(s, delim, lasts)

        char *s;

        const char *delim;

        char **lasts;

{

        const char *spanp;

        int c, sc;

        char *tok;

        if (s == NULL && (s = *lasts) == NULL)

                return (NULL);

        /*

         * Skip (span) leading delimiters (s += strspn(s, delim), sort of).

         */

cont:

        c = *s++;

        for (spanp = delim; (sc = *spanp++) != 0;) {

                if (c == sc)

                        goto cont;

        }

        if (c == 0) {                /* no non-delimiter characters */

                *lasts = NULL;

                return (NULL);

        }

        tok = s - 1;

        /*

         * Scan token (scan for delimiters: s += strcspn(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 == 0)

                                        s = NULL;

                                else

                                        s[-1] = 0;

                                *lasts = s;

                                return (tok);

                        }

                } while (sc != 0);

        }

        /* NOTREACHED */

}