1/*
2 * Copyright (c) 1988 Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <string.h>
31
32char *
33strtok(char *s, const char *delim)
34{
35	static char *last;
36
37	return strtok_r(s, delim, &last);
38}
39
40char *
41strtok_r(char *s, const char *delim, char **last)
42{
43	char *spanp;
44	int c, sc;
45	char *tok;
46
47
48	if (s == NULL && (s = *last) == NULL)
49		return (NULL);
50
51	/*
52	 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
53	 */
54cont:
55	c = *s++;
56	for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
57		if (c == sc)
58			goto cont;
59	}
60
61	if (c == 0) {		/* no non-delimiter characters */
62		*last = NULL;
63		return (NULL);
64	}
65	tok = s - 1;
66
67	/*
68	 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
69	 * Note that delim must have one NUL; we stop if we see that, too.
70	 */
71	for (;;) {
72		c = *s++;
73		spanp = (char *)delim;
74		do {
75			if ((sc = *spanp++) == c) {
76				if (c == 0)
77					s = NULL;
78				else
79					s[-1] = 0;
80				*last = s;
81				return (tok);
82			}
83		} while (sc != 0);
84	}
85	/* NOTREACHED */
86}
87