1 /* Copyright (C) 1992, 93, 96, 97, 98, 99, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18 #include <string.h>
19
20 #ifdef __USE_BSD
21
22
strsep(char ** stringp,const char * delim)23 char *strsep (char **stringp, const char *delim)
24 {
25 char *begin, *end;
26
27 begin = *stringp;
28 if (begin == NULL)
29 return NULL;
30
31 /* A frequent case is when the delimiter string contains only one
32 character. Here we don't need to call the expensive `strpbrk'
33 function and instead work using `strchr'. */
34 if (delim[0] == '\0' || delim[1] == '\0')
35 {
36 char ch = delim[0];
37
38 if (ch == '\0')
39 end = NULL;
40 else
41 {
42 if (*begin == ch)
43 end = begin;
44 else if (*begin == '\0')
45 end = NULL;
46 else
47 end = strchr (begin + 1, ch);
48 }
49 }
50 else
51 /* Find the end of the token. */
52 end = strpbrk (begin, delim);
53
54 if (end)
55 {
56 /* Terminate the token and set *STRINGP past NUL character. */
57 *end++ = '\0';
58 *stringp = end;
59 }
60 else
61 /* No more delimiters; this is the last token. */
62 *stringp = NULL;
63
64 return begin;
65 }
66 libc_hidden_def(strsep)
67 #endif
68