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 <[email protected]>
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 #if defined(LIBC_SCCS) && !defined(lint)
38 static char sccsid[] = "@(#)strtok.c 8.1 (Berkeley) 6/4/93";
39 #endif /* LIBC_SCCS and not lint */
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
42
43 #include <stddef.h>
44 #ifdef DEBUG_STRTOK
45 #include <stdio.h>
46 #endif
47 #include <string.h>
48
49 char *__strtok_r(char *, const char *, char **);
50
51 __weak_reference(__strtok_r, strtok_r);
52
53 char *
__strtok_r(char * s,const char * delim,char ** last)54 __strtok_r(char *s, const char *delim, char **last)
55 {
56 char *spanp, *tok;
57 int c, sc;
58
59 if (s == NULL && (s = *last) == NULL)
60 return (NULL);
61
62 /*
63 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
64 */
65 cont:
66 c = *s++;
67 for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
68 if (c == sc)
69 goto cont;
70 }
71
72 if (c == 0) { /* no non-delimiter characters */
73 *last = NULL;
74 return (NULL);
75 }
76 tok = s - 1;
77
78 /*
79 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
80 * Note that delim must have one NUL; we stop if we see that, too.
81 */
82 for (;;) {
83 c = *s++;
84 spanp = (char *)delim;
85 do {
86 if ((sc = *spanp++) == c) {
87 if (c == 0)
88 s = NULL;
89 else
90 s[-1] = '\0';
91 *last = s;
92 return (tok);
93 }
94 } while (sc != 0);
95 }
96 /* NOTREACHED */
97 }
98
99 char *
strtok(char * s,const char * delim)100 strtok(char *s, const char *delim)
101 {
102 static char *last;
103
104 return (__strtok_r(s, delim, &last));
105 }
106
107 #ifdef DEBUG_STRTOK
108 /*
109 * Test the tokenizer.
110 */
111 int
main(void)112 main(void)
113 {
114 char blah[80], test[80];
115 char *brkb, *brkt, *phrase, *sep, *word;
116
117 sep = "\\/:;=-";
118 phrase = "foo";
119
120 printf("String tokenizer test:\n");
121 strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
122 for (word = strtok(test, sep); word; word = strtok(NULL, sep))
123 printf("Next word is \"%s\".\n", word);
124 strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
125
126 for (word = strtok_r(test, sep, &brkt); word;
127 word = strtok_r(NULL, sep, &brkt)) {
128 strcpy(blah, "blah:blat:blab:blag");
129
130 for (phrase = strtok_r(blah, sep, &brkb); phrase;
131 phrase = strtok_r(NULL, sep, &brkb))
132 printf("So far we're at %s:%s\n", word, phrase);
133 }
134
135 return (0);
136 }
137
138 #endif /* DEBUG_STRTOK */
139