1/* Reentrant string tokenizer. Generic version.
2 Copyright (C) 1991-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library 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 GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifdef HAVE_CONFIG_H
20# include <config.h>
21#endif
22
23#include <string.h>
24
25#ifndef _LIBC
26/* Get specification. */
27# include "strtok_r.h"
28# define __strtok_r strtok_r
29#endif
30
31/* Parse S into tokens separated by characters in DELIM.
32 If S is NULL, the saved pointer in SAVE_PTR is used as
33 the next starting point. For example:
34 char s[] = "-abc-=-def";
35 char *sp;
36 x = strtok_r(s, "-", &sp); // x = "abc", sp = "=-def"
37 x = strtok_r(NULL, "-=", &sp); // x = "def", sp = NULL
38 x = strtok_r(NULL, "=", &sp); // x = NULL
39 // s = "abc\0-def\0"
40*/
41char *
42__strtok_r (char *s, const char *delim, char **save_ptr)
43{
44 char *end;
45
46 if (s == NULL)
47 s = *save_ptr;
48
49 if (*s == '\0')
50 {
51 *save_ptr = s;
52 return NULL;
53 }
54
55 /* Scan leading delimiters. */
56 s += strspn (s, delim);
57 if (*s == '\0')
58 {
59 *save_ptr = s;
60 return NULL;
61 }
62
63 /* Find the end of the token. */
64 end = s + strcspn (s, delim);
65 if (*end == '\0')
66 {
67 *save_ptr = end;
68 return s;
69 }
70
71 /* Terminate the token and make *SAVE_PTR point past it. */
72 *end = '\0';
73 *save_ptr = end + 1;
74 return s;
75}
76#ifdef weak_alias
77libc_hidden_def (__strtok_r)
78weak_alias (__strtok_r, strtok_r)
79#endif
80