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strtok.c (2986B)
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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. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by Softweyr LLC, the
21 * University of California, Berkeley, and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
28 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
29 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SOFTWEYR LLC, THE
30 * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
31 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
32 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #include <stddef.h>
40 #include <string.h>
41
42 char *
43 strtok_r(char *s, const char *delim, char **last)
44 {
45 char *spanp, *tok;
46 int c, sc;
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 = (char *)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 = (char *)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
88 char *
89 strtok(char *s, const char *delim)
90 {
91 static char *last;
92
93 return (strtok_r(s, delim, &last));
94 }
95