1 /*
2 * Copyright (c) 1988 Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <string.h>
31
32 static char *
__strtok_r(register char * s,register const char * delim,char ** lasts,int skip_leading_delim)33 __strtok_r (register char *s,
34 register const char *delim,
35 char **lasts,
36 int skip_leading_delim)
37 {
38 register char *spanp;
39 register int c, sc;
40 char *tok;
41
42
43 if (s == NULL && (s = *lasts) == NULL)
44 return (NULL);
45
46 /*
47 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
48 */
49 cont:
50 c = *s++;
51 for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
52 if (c == sc) {
53 if (skip_leading_delim) {
54 goto cont;
55 }
56 else {
57 *lasts = s;
58 s[-1] = 0;
59 return (s - 1);
60 }
61 }
62 }
63
64 if (c == 0) { /* no non-delimiter characters */
65 *lasts = NULL;
66 return (NULL);
67 }
68 tok = s - 1;
69
70 /*
71 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
72 * Note that delim must have one NUL; we stop if we see that, too.
73 */
74 for (;;) {
75 c = *s++;
76 spanp = (char *)delim;
77 do {
78 if ((sc = *spanp++) == c) {
79 if (c == 0)
80 s = NULL;
81 else
82 s[-1] = 0;
83 *lasts = s;
84 return (tok);
85 }
86 } while (sc != 0);
87 }
88 /* NOTREACHED */
89 }
90
91 char *
strtok_r(register char * __restrict s,register const char * __restrict delim,char ** __restrict lasts)92 strtok_r (register char *__restrict s,
93 register const char *__restrict delim,
94 char **__restrict lasts)
95 {
96 return __strtok_r (s, delim, lasts, 1);
97 }
98