1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1998 Softweyr LLC. All rights reserved.
5 *
6 * strtok_r, from Berkeley strtok
7 * Oct 13, 1998 by Wes Peters <wes@softweyr.com>
8 *
9 * Copyright (c) 1988, 1993
10 * The Regents of the University of California. All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notices, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notices, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
27 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SOFTWEYR LLC, THE
28 * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
30 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
31 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
37 #include <string.h>
38
39 char *
strtok_r(char * s,const char * delim,char ** last)40 strtok_r(char *s, const char *delim, char **last)
41 {
42 char *spanp, *tok;
43 int c, sc;
44
45 if (s == NULL && (s = *last) == NULL)
46 return (NULL);
47
48 /*
49 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
50 */
51 cont:
52 c = *s++;
53 for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
54 if (c == sc)
55 goto cont;
56 }
57
58 if (c == 0) { /* no non-delimiter characters */
59 *last = NULL;
60 return (NULL);
61 }
62 tok = s - 1;
63
64 /*
65 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
66 * Note that delim must have one NUL; we stop if we see that, too.
67 */
68 for (;;) {
69 c = *s++;
70 spanp = (char *)delim;
71 do {
72 if ((sc = *spanp++) == c) {
73 if (c == 0)
74 s = NULL;
75 else
76 s[-1] = '\0';
77 *last = s;
78 return (tok);
79 }
80 } while (sc != 0);
81 }
82 /* NOTREACHED */
83 }
84