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