Updated to fedora-glibc-20080524T2218
[glibc.git] / string / strtok_r.c
blobb11cb520f67223ca00f65d69f6665b2914037034
1 /* Reentrant string tokenizer. Generic version.
2 Copyright (C) 1991,1996-1999,2001,2004 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #ifdef HAVE_CONFIG_H
21 # include <config.h>
22 #endif
24 #include <string.h>
26 #undef strtok_r
27 #undef __strtok_r
29 #ifndef _LIBC
30 /* Get specification. */
31 # include "strtok_r.h"
32 # define __strtok_r strtok_r
33 # define __rawmemchr strchr
34 #endif
36 /* Parse S into tokens separated by characters in DELIM.
37 If S is NULL, the saved pointer in SAVE_PTR is used as
38 the next starting point. For example:
39 char s[] = "-abc-=-def";
40 char *sp;
41 x = strtok_r(s, "-", &sp); // x = "abc", sp = "=-def"
42 x = strtok_r(NULL, "-=", &sp); // x = "def", sp = NULL
43 x = strtok_r(NULL, "=", &sp); // x = NULL
44 // s = "abc\0-def\0"
46 char *
47 __strtok_r (char *s, const char *delim, char **save_ptr)
49 char *token;
51 if (s == NULL)
52 s = *save_ptr;
54 /* Scan leading delimiters. */
55 s += strspn (s, delim);
56 if (*s == '\0')
58 *save_ptr = s;
59 return NULL;
62 /* Find the end of the token. */
63 token = s;
64 s = strpbrk (token, delim);
65 if (s == NULL)
66 /* This token finishes the string. */
67 *save_ptr = __rawmemchr (token, '\0');
68 else
70 /* Terminate the token and make *SAVE_PTR point past it. */
71 *s = '\0';
72 *save_ptr = s + 1;
74 return token;
76 #ifdef weak_alias
77 libc_hidden_def (__strtok_r)
78 weak_alias (__strtok_r, strtok_r)
79 #endif