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-rw-r--r--gl/strsep.c58
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1/* Copyright (C) 2004, 2007, 2009, 2010 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, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18
19#ifdef HAVE_CONFIG_H
20# include <config.h>
21#endif
22
23/* Specification. */
24#include <string.h>
25
26char *
27strsep (char **stringp, const char *delim)
28{
29 char *start = *stringp;
30 char *ptr;
31
32 if (start == NULL)
33 return NULL;
34
35 /* Optimize the case of no delimiters. */
36 if (delim[0] == '\0')
37 {
38 *stringp = NULL;
39 return start;
40 }
41
42 /* Optimize the case of one delimiter. */
43 if (delim[1] == '\0')
44 ptr = strchr (start, delim[0]);
45 else
46 /* The general case. */
47 ptr = strpbrk (start, delim);
48 if (ptr == NULL)
49 {
50 *stringp = NULL;
51 return start;
52 }
53
54 *ptr = '\0';
55 *stringp = ptr + 1;
56
57 return start;
58}