1 /* $NetBSD: strtok_r.c,v 1.10 2012/06/25 22:32:46 abs 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
35 static char *sccsid = "@(#)strtok.c 5.8 (Berkeley) 2/24/91";
36 #else
37 __RCSID("$NetBSD: strtok_r.c,v 1.10 2012/06/25 22:32:46 abs 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
__weak_alias(strtok_r,_strtok_r)47 __weak_alias(strtok_r,_strtok_r)
48 #endif
49
50 char *
51 strtok_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 */
67 cont:
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