Fix build errors with -DNDEBUG.
[glibc.git] / string / strtok_r.c
blobf351304766108dad2c1cff881ad3bebae821b2a0
1 /* Reentrant string tokenizer. Generic version.
2 Copyright (C) 1991-2016 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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 <http://www.gnu.org/licenses/>. */
19 #ifdef HAVE_CONFIG_H
20 # include <config.h>
21 #endif
23 #include <string.h>
25 #undef strtok_r
26 #undef __strtok_r
28 #ifndef _LIBC
29 /* Get specification. */
30 # include "strtok_r.h"
31 # define __strtok_r strtok_r
32 # define __rawmemchr strchr
33 #endif
35 /* Parse S into tokens separated by characters in DELIM.
36 If S is NULL, the saved pointer in SAVE_PTR is used as
37 the next starting point. For example:
38 char s[] = "-abc-=-def";
39 char *sp;
40 x = strtok_r(s, "-", &sp); // x = "abc", sp = "=-def"
41 x = strtok_r(NULL, "-=", &sp); // x = "def", sp = NULL
42 x = strtok_r(NULL, "=", &sp); // x = NULL
43 // s = "abc\0-def\0"
45 char *
46 __strtok_r (char *s, const char *delim, char **save_ptr)
48 char *token;
50 if (s == NULL)
51 s = *save_ptr;
53 /* Scan leading delimiters. */
54 s += strspn (s, delim);
55 if (*s == '\0')
57 *save_ptr = s;
58 return NULL;
61 /* Find the end of the token. */
62 token = s;
63 s = strpbrk (token, delim);
64 if (s == NULL)
65 /* This token finishes the string. */
66 *save_ptr = __rawmemchr (token, '\0');
67 else
69 /* Terminate the token and make *SAVE_PTR point past it. */
70 *s = '\0';
71 *save_ptr = s + 1;
73 return token;
75 #ifdef weak_alias
76 libc_hidden_def (__strtok_r)
77 weak_alias (__strtok_r, strtok_r)
78 #endif