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421693b0 | 1 | /* Reentrant string tokenizer. Generic version. |
5df4cba6 | 2 | Copyright (C) 1991, 1996-1999, 2001, 2004, 2007, 2009-2020 Free Software |
421693b0 PA |
3 | Foundation, Inc. |
4 | This file is part of the GNU C Library. | |
5 | ||
6 | This program is free software: you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
c0c3707f | 17 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
421693b0 PA |
18 | |
19 | #ifdef HAVE_CONFIG_H | |
20 | # include <config.h> | |
21 | #endif | |
22 | ||
23 | #include <string.h> | |
24 | ||
25 | #ifdef _LIBC | |
26 | # undef strtok_r | |
27 | # undef __strtok_r | |
28 | #else | |
29 | # define __strtok_r strtok_r | |
30 | # define __rawmemchr strchr | |
31 | #endif | |
32 | ||
33 | /* Parse S into tokens separated by characters in DELIM. | |
34 | If S is NULL, the saved pointer in SAVE_PTR is used as | |
35 | the next starting point. For example: | |
36 | char s[] = "-abc-=-def"; | |
37 | char *sp; | |
38 | x = strtok_r(s, "-", &sp); // x = "abc", sp = "=-def" | |
39 | x = strtok_r(NULL, "-=", &sp); // x = "def", sp = NULL | |
40 | x = strtok_r(NULL, "=", &sp); // x = NULL | |
41 | // s = "abc\0-def\0" | |
42 | */ | |
43 | char * | |
44 | __strtok_r (char *s, const char *delim, char **save_ptr) | |
45 | { | |
46 | char *token; | |
47 | ||
48 | if (s == NULL) | |
49 | s = *save_ptr; | |
50 | ||
51 | /* Scan leading delimiters. */ | |
52 | s += strspn (s, delim); | |
53 | if (*s == '\0') | |
54 | { | |
55 | *save_ptr = s; | |
56 | return NULL; | |
57 | } | |
58 | ||
59 | /* Find the end of the token. */ | |
60 | token = s; | |
61 | s = strpbrk (token, delim); | |
62 | if (s == NULL) | |
63 | /* This token finishes the string. */ | |
64 | *save_ptr = __rawmemchr (token, '\0'); | |
65 | else | |
66 | { | |
67 | /* Terminate the token and make *SAVE_PTR point past it. */ | |
68 | *s = '\0'; | |
69 | *save_ptr = s + 1; | |
70 | } | |
71 | return token; | |
72 | } | |
73 | #ifdef weak_alias | |
74 | libc_hidden_def (__strtok_r) | |
75 | weak_alias (__strtok_r, strtok_r) | |
76 | #endif |