1 /* $NetBSD: strtok.cpp,v 1.3 2011/09/23 16:00:15 nonaka Exp $ */
2
3 /*
4 * Copyright (c) 1988, 1993
5 * The Regents of the University of California. 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 "stand.h"
33 #include <sys/cdefs.h>
34 #include <sys/types.h>
35 #include <stdlib.h>
36 #include <libsa_string.h>
37
38 LIBSA_NAMESPACE_BEGIN
39 __BEGIN_DECLS
40 char *
strtok(char * s,const char * delim)41 strtok(char *s, const char *delim)
42 {
43 const char *spanp;
44 int c, sc;
45 char *tok;
46 static char *last;
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 */
54 cont:
55 c = *s++;
56 for (spanp = 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 = 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 __END_DECLS
88 LIBSA_NAMESPACE_END
89