source: trunk/libs/newlib/src/newlib/libc/string/strtok_r.c @ 543

/*
 * 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 <string.h>

char *
__strtok_r (register char *s,
        register const char *delim,
        char **lasts,
        int skip_leading_delim)
{
        register char *spanp;
        register 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 = (char *)delim; (sc = *spanp++) != 0;) {
                if (c == sc) {
                        if (skip_leading_delim) {
                                goto cont;
                        }
                        else {
                                *lasts = s;
                                s[-1] = 0;
                                return (s - 1);
                        }
                }
        }

        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 = (char *)delim;
                do {
                        if ((sc = *spanp++) == c) {
                                if (c == 0)
                                        s = NULL;
                                else
                                        s[-1] = 0;
                                *lasts = s;
                                return (tok);
                        }
                } while (sc != 0);
        }
        /* NOTREACHED */
}

char *
strtok_r (register char *__restrict s,
        register const char *__restrict delim,
        char **__restrict lasts)
{
        return __strtok_r (s, delim, lasts, 1);
}