1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. 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 * 4. 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 /*
33 * Get next token from string *stringp, where tokens are possibly-empty
34 * strings separated by characters from delim.
35 *
36 * Writes NULs into the string at *stringp to end tokens.
37 * delim need not remain constant from call to call.
38 * On return, *stringp points past the last NUL written (if there might
39 * be further tokens), or is NULL (if there are definitely no more tokens).
40 *
41 * If *stringp is NULL, strsep returns NULL.
42 */
43 __attribute__((visibility("hidden")))
44 char *
strsep(char ** stringp,const char * delim)45 strsep(char **stringp, const char *delim)
46 {
47 char *s;
48 const char *spanp;
49 int c, sc;
50 char *tok;
51
52 if ((s = *stringp) == NULL) {
53 return NULL;
54 }
55 for (tok = s;;) {
56 c = *s++;
57 spanp = delim;
58 do {
59 if ((sc = *spanp++) == c) {
60 if (c == 0) {
61 s = NULL;
62 } else {
63 s[-1] = 0;
64 }
65 *stringp = s;
66 return tok;
67 }
68 } while (sc != 0);
69 }
70 /* NOTREACHED */
71 }
72