1 | /* Copyright (C) 1992-2016 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 | #undef __strsep |
21 | #undef strsep |
22 | |
23 | char * |
24 | __strsep (char **stringp, const char *delim) |
25 | { |
26 | char *begin, *end; |
27 | |
28 | begin = *stringp; |
29 | if (begin == NULL) |
30 | return NULL; |
31 | |
32 | /* A frequent case is when the delimiter string contains only one |
33 | character. Here we don't need to call the expensive `strpbrk' |
34 | function and instead work using `strchr'. */ |
35 | if (delim[0] == '\0' || delim[1] == '\0') |
36 | { |
37 | char ch = delim[0]; |
38 | |
39 | if (ch == '\0') |
40 | end = NULL; |
41 | else |
42 | { |
43 | if (*begin == ch) |
44 | end = begin; |
45 | else if (*begin == '\0') |
46 | end = NULL; |
47 | else |
48 | end = strchr (begin + 1, ch); |
49 | } |
50 | } |
51 | else |
52 | /* Find the end of the token. */ |
53 | end = strpbrk (begin, delim); |
54 | |
55 | if (end) |
56 | { |
57 | /* Terminate the token and set *STRINGP past NUL character. */ |
58 | *end++ = '\0'; |
59 | *stringp = end; |
60 | } |
61 | else |
62 | /* No more delimiters; this is the last token. */ |
63 | *stringp = NULL; |
64 | |
65 | return begin; |
66 | } |
67 | weak_alias (__strsep, strsep) |
68 | strong_alias (__strsep, __strsep_g) |
69 | libc_hidden_def (__strsep_g) |
70 | |