1 /*
2 * Copyright (c) 1988 Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <string.h>
31
32 char *
strtok(char * s,const char * delim)33 strtok(char *s, const char *delim)
34 {
35 static char *last;
36
37 return strtok_r(s, delim, &last);
38 }
39 DEF_STRONG(strtok);
40
41 char *
strtok_r(char * s,const char * delim,char ** last)42 strtok_r(char *s, const char *delim, char **last)
43 {
44 const char *spanp;
45 int c, sc;
46 char *tok;
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 DEF_WEAK(strtok_r);
88