1/*	$NetBSD: strtok_r.c,v 1.9 2003/08/07 16:43:53 agc Exp $	*/
2
3/*
4 * Copyright (c) 1988 Regents of the University of California.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char *sccsid = "@(#)strtok.c	5.8 (Berkeley) 2/24/91";
36#else
37__RCSID("$NetBSD: strtok_r.c,v 1.9 2003/08/07 16:43:53 agc Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include "namespace.h"
42
43#include <assert.h>
44#include <string.h>
45
46#ifdef __weak_alias
47__weak_alias(strtok_r,_strtok_r)
48#endif
49
50char *
51strtok_r(char *s, const char *delim, char **lasts)
52{
53	const char *spanp;
54	int c, sc;
55	char *tok;
56
57	/* s may be NULL */
58	_DIAGASSERT(delim != NULL);
59	_DIAGASSERT(lasts != NULL);
60
61	if (s == NULL && (s = *lasts) == NULL)
62		return (NULL);
63
64	/*
65	 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
66	 */
67cont:
68	c = *s++;
69	for (spanp = delim; (sc = *spanp++) != 0;) {
70		if (c == sc)
71			goto cont;
72	}
73
74	if (c == 0) {		/* no non-delimiter characters */
75		*lasts = NULL;
76		return (NULL);
77	}
78	tok = s - 1;
79
80	/*
81	 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
82	 * Note that delim must have one NUL; we stop if we see that, too.
83	 */
84	for (;;) {
85		c = *s++;
86		spanp = delim;
87		do {
88			if ((sc = *spanp++) == c) {
89				if (c == 0)
90					s = NULL;
91				else
92					s[-1] = 0;
93				*lasts = s;
94				return (tok);
95			}
96		} while (sc != 0);
97	}
98	/* NOTREACHED */
99}
100