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. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
25 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SOFTWEYR LLC, THE
26 * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
28 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 * @(#)strtok.c 8.1 (Berkeley) 6/4/93
35 * $FreeBSD: head/lib/libc/string/strtok.c 251069 2013-05-28 20:57:40Z emaste $
36 */
37
38 #include <stddef.h>
39 #ifdef DEBUG_STRTOK
40 #include <stdio.h>
41 #endif
42 #include <string.h>
43
44 #ifdef _STANDALONE
45 #define TLS_ATTRIBUTE
46 #define __thread
47 #else
48 #include "libc_private.h"
49 #endif
50
51 char *__strtok_r(char *, const char *, char **);
52
53 char *
__strtok_r(char * __restrict s,const char * __restrict delim,char ** __restrict last)54 __strtok_r(char * __restrict s, const char * __restrict delim,
55 char ** __restrict last)
56 {
57 char *spanp, *tok;
58 int c, sc;
59
60 if (s == NULL && (s = *last) == NULL)
61 return (NULL);
62
63 /*
64 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
65 */
66 cont:
67 c = *s++;
68 for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
69 if (c == sc)
70 goto cont;
71 }
72
73 if (c == 0) { /* no non-delimiter characters */
74 *last = NULL;
75 return (NULL);
76 }
77 tok = s - 1;
78
79 /*
80 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
81 * Note that delim must have one NUL; we stop if we see that, too.
82 */
83 for (;;) {
84 c = *s++;
85 spanp = (char *)delim;
86 do {
87 if ((sc = *spanp++) == c) {
88 if (c == 0)
89 s = NULL;
90 else
91 s[-1] = '\0';
92 *last = s;
93 return (tok);
94 }
95 } while (sc != 0);
96 }
97 /* NOTREACHED */
98 }
99
100 __weak_reference(__strtok_r, strtok_r);
101
102 /*
103 * Even though strtok() is documented as not being thread-safe,
104 * programs are getting so complex these days that more and more
105 * code assumes thread-safety throughout libc. So make strtok()
106 * thread-safe as well.
107 */
108 char *
strtok(char * s,const char * delim)109 strtok(char *s, const char *delim)
110 {
111 static __thread char *last TLS_ATTRIBUTE;
112
113 return (__strtok_r(s, delim, &last));
114 }
115
116 #ifdef DEBUG_STRTOK
117 /*
118 * Test the tokenizer.
119 */
120 int
main(void)121 main(void)
122 {
123 char blah[80], test[80];
124 char *brkb, *brkt, *phrase, *sep, *word;
125
126 sep = "\\/:;=-";
127 phrase = "foo";
128
129 printf("String tokenizer test:\n");
130 strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
131 for (word = strtok(test, sep); word; word = strtok(NULL, sep))
132 printf("Next word is \"%s\".\n", word);
133 strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
134
135 for (word = strtok_r(test, sep, &brkt); word;
136 word = strtok_r(NULL, sep, &brkt)) {
137 strcpy(blah, "blah:blat:blab:blag");
138
139 for (phrase = strtok_r(blah, sep, &brkb); phrase;
140 phrase = strtok_r(NULL, sep, &brkb))
141 printf("So far we're at %s:%s\n", word, phrase);
142 }
143
144 return (0);
145 }
146
147 #endif /* DEBUG_STRTOK */
148