1/*-
2 * Copyright (c) 1998 Softweyr LLC.  All rights reserved.
3 *
4 * strtok_r, from Berkeley strtok
5 * Oct 13, 1998 by Wes Peters <wes@softweyr.com>
6 *
7 * Copyright (c) 1988, 1993
8 *	The Regents of the University of California.  All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notices, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notices, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
25 * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL SOFTWEYR LLC, THE
26 * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
28 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#if defined(LIBC_SCCS) && !defined(lint)
36static char sccsid[] = "@(#)strtok.c	8.1 (Berkeley) 6/4/93";
37#endif /* LIBC_SCCS and not lint */
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD$");
40
41#include <stddef.h>
42#ifdef DEBUG_STRTOK
43#include <stdio.h>
44#endif
45#include <string.h>
46
47char	*__strtok_r(char *, const char *, char **);
48
49__weak_reference(__strtok_r, strtok_r);
50
51char *
52__strtok_r(char *s, const char *delim, char **last)
53{
54	char *spanp, *tok;
55	int c, sc;
56
57	if (s == NULL && (s = *last) == NULL)
58		return (NULL);
59
60	/*
61	 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
62	 */
63cont:
64	c = *s++;
65	for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
66		if (c == sc)
67			goto cont;
68	}
69
70	if (c == 0) {		/* no non-delimiter characters */
71		*last = NULL;
72		return (NULL);
73	}
74	tok = s - 1;
75
76	/*
77	 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
78	 * Note that delim must have one NUL; we stop if we see that, too.
79	 */
80	for (;;) {
81		c = *s++;
82		spanp = (char *)delim;
83		do {
84			if ((sc = *spanp++) == c) {
85				if (c == 0)
86					s = NULL;
87				else
88					s[-1] = '\0';
89				*last = s;
90				return (tok);
91			}
92		} while (sc != 0);
93	}
94	/* NOTREACHED */
95}
96
97char *
98strtok(char *s, const char *delim)
99{
100	static char *last;
101
102	return (__strtok_r(s, delim, &last));
103}
104
105#ifdef DEBUG_STRTOK
106/*
107 * Test the tokenizer.
108 */
109int
110main(void)
111{
112	char blah[80], test[80];
113	char *brkb, *brkt, *phrase, *sep, *word;
114
115	sep = "\\/:;=-";
116	phrase = "foo";
117
118	printf("String tokenizer test:\n");
119	strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
120	for (word = strtok(test, sep); word; word = strtok(NULL, sep))
121		printf("Next word is \"%s\".\n", word);
122	strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
123
124	for (word = strtok_r(test, sep, &brkt); word;
125	    word = strtok_r(NULL, sep, &brkt)) {
126		strcpy(blah, "blah:blat:blab:blag");
127
128		for (phrase = strtok_r(blah, sep, &brkb); phrase;
129		    phrase = strtok_r(NULL, sep, &brkb))
130			printf("So far we're at %s:%s\n", word, phrase);
131	}
132
133	return (0);
134}
135
136#endif /* DEBUG_STRTOK */
137