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 <stddef.h>
41 #ifdef DEBUG_STRTOK
42 #include <stdio.h>
43 #endif
44 #include <string.h>
45
46 char *__strtok_r(char *, const char *, char **);
47
48 __weak_reference(__strtok_r, strtok_r);
49
50 char *
__strtok_r(char * s,const char * delim,char ** last)51 __strtok_r(char *s, const char *delim, char **last)
52 {
53 char *spanp, *tok;
54 int c, sc;
55
56 if (s == NULL && (s = *last) == NULL)
57 return (NULL);
58
59 /*
60 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
61 */
62 cont:
63 c = *s++;
64 for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
65 if (c == sc)
66 goto cont;
67 }
68
69 if (c == 0) { /* no non-delimiter characters */
70 *last = NULL;
71 return (NULL);
72 }
73 tok = s - 1;
74
75 /*
76 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
77 * Note that delim must have one NUL; we stop if we see that, too.
78 */
79 for (;;) {
80 c = *s++;
81 spanp = (char *)delim;
82 do {
83 if ((sc = *spanp++) == c) {
84 if (c == 0)
85 s = NULL;
86 else
87 s[-1] = '\0';
88 *last = s;
89 return (tok);
90 }
91 } while (sc != 0);
92 }
93 /* NOTREACHED */
94 }
95
96 char *
strtok(char * s,const char * delim)97 strtok(char *s, const char *delim)
98 {
99 static char *last;
100
101 return (__strtok_r(s, delim, &last));
102 }
103
104 #ifdef DEBUG_STRTOK
105 /*
106 * Test the tokenizer.
107 */
108 int
main(void)109 main(void)
110 {
111 char blah[80], test[80];
112 char *brkb, *brkt, *phrase, *sep, *word;
113
114 sep = "\\/:;=-";
115 phrase = "foo";
116
117 printf("String tokenizer test:\n");
118 strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
119 for (word = strtok(test, sep); word; word = strtok(NULL, sep))
120 printf("Next word is \"%s\".\n", word);
121 strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
122
123 for (word = strtok_r(test, sep, &brkt); word;
124 word = strtok_r(NULL, sep, &brkt)) {
125 strcpy(blah, "blah:blat:blab:blag");
126
127 for (phrase = strtok_r(blah, sep, &brkb); phrase;
128 phrase = strtok_r(NULL, sep, &brkb))
129 printf("So far we're at %s:%s\n", word, phrase);
130 }
131
132 return (0);
133 }
134
135 #endif /* DEBUG_STRTOK */
136