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 * 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 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include <string.h>
37 #include <stdio.h>
38
39 /*
40 * Get next token from string *stringp, where tokens are possibly-empty
41 * strings separated by characters from delim.
42 *
43 * Writes NULs into the string at *stringp to end tokens.
44 * delim need not remain constant from call to call.
45 * On return, *stringp points past the last NUL written (if there might
46 * be further tokens), or is NULL (if there are definitely no more tokens).
47 *
48 * If *stringp is NULL, strsep returns NULL.
49 */
50 char *
strsep(char ** stringp,const char * delim)51 strsep(char **stringp, const char *delim)
52 {
53 char *s;
54 const char *spanp;
55 int c, sc;
56 char *tok;
57
58 if ((s = *stringp) == NULL)
59 return (NULL);
60 for (tok = s;;) {
61 c = *s++;
62 spanp = delim;
63 do {
64 if ((sc = *spanp++) == c) {
65 if (c == 0)
66 s = NULL;
67 else
68 s[-1] = 0;
69 *stringp = s;
70 return (tok);
71 }
72 } while (sc != 0);
73 }
74 /* NOTREACHED */
75 }
76