1 /* Copyright (C) 2004, 2007, 2009-2015 Free Software Foundation, Inc.
2
3 Written by Yoann Vandoorselaere <yoann@prelude-ids.org>.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, see <http://www.gnu.org/licenses/>. */
17
18 #ifdef HAVE_CONFIG_H
19 # include <config.h>
20 #endif
21
22 /* Specification. */
23 #include <string.h>
24
25 char *
strsep(char ** stringp,const char * delim)26 strsep (char **stringp, const char *delim)
27 {
28 char *start = *stringp;
29 char *ptr;
30
31 if (start == NULL)
32 return NULL;
33
34 /* Optimize the case of no delimiters. */
35 if (delim[0] == '\0')
36 {
37 *stringp = NULL;
38 return start;
39 }
40
41 /* Optimize the case of one delimiter. */
42 if (delim[1] == '\0')
43 ptr = strchr (start, delim[0]);
44 else
45 /* The general case. */
46 ptr = strpbrk (start, delim);
47 if (ptr == NULL)
48 {
49 *stringp = NULL;
50 return start;
51 }
52
53 *ptr = '\0';
54 *stringp = ptr + 1;
55
56 return start;
57 }
58