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 <stddef.h>
38 #ifdef DEBUG_STRTOK
39 #include <stdio.h>
40 #endif
41 #include <string.h>
42
43 char *__strtok_r(char *, const char *, char **);
44
45 __weak_reference(__strtok_r, strtok_r);
46
47 char *
__strtok_r(char * s,const char * delim,char ** last)48 __strtok_r(char *s, const char *delim, char **last)
49 {
50 char *spanp, *tok;
51 int c, sc;
52
53 if (s == NULL && (s = *last) == NULL)
54 return (NULL);
55
56 /*
57 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
58 */
59 cont:
60 c = *s++;
61 for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
62 if (c == sc)
63 goto cont;
64 }
65
66 if (c == 0) { /* no non-delimiter characters */
67 *last = NULL;
68 return (NULL);
69 }
70 tok = s - 1;
71
72 /*
73 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
74 * Note that delim must have one NUL; we stop if we see that, too.
75 */
76 for (;;) {
77 c = *s++;
78 spanp = (char *)delim;
79 do {
80 if ((sc = *spanp++) == c) {
81 if (c == 0)
82 s = NULL;
83 else
84 s[-1] = '\0';
85 *last = s;
86 return (tok);
87 }
88 } while (sc != 0);
89 }
90 /* NOTREACHED */
91 }
92
93 char *
strtok(char * s,const char * delim)94 strtok(char *s, const char *delim)
95 {
96 static char *last;
97
98 return (__strtok_r(s, delim, &last));
99 }
100
101 #ifdef DEBUG_STRTOK
102 /*
103 * Test the tokenizer.
104 */
105 int
main(void)106 main(void)
107 {
108 char blah[80], test[80];
109 char *brkb, *brkt, *phrase, *sep, *word;
110
111 sep = "\\/:;=-";
112 phrase = "foo";
113
114 printf("String tokenizer test:\n");
115 strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
116 for (word = strtok(test, sep); word; word = strtok(NULL, sep))
117 printf("Next word is \"%s\".\n", word);
118 strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
119
120 for (word = strtok_r(test, sep, &brkt); word;
121 word = strtok_r(NULL, sep, &brkt)) {
122 strcpy(blah, "blah:blat:blab:blag");
123
124 for (phrase = strtok_r(blah, sep, &brkb); phrase;
125 phrase = strtok_r(NULL, sep, &brkb))
126 printf("So far we're at %s:%s\n", word, phrase);
127 }
128
129 return (0);
130 }
131
132 #endif /* DEBUG_STRTOK */
133