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/* Reentrant string tokenizer. Generic version.
Copyright (C) 1991, 1996-1999, 2001, 2004, 2007, 2009-2021 Free Software
Foundation, Inc.
This file is part of the GNU C Library.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <>. */
# include <config.h>
#include <string.h>
#ifdef _LIBC
# undef strtok_r
# undef __strtok_r
# define __strtok_r strtok_r
# define __rawmemchr strchr
/* Parse S into tokens separated by characters in DELIM.
If S is NULL, the saved pointer in SAVE_PTR is used as
the next starting point. For example:
char s[] = "-abc-=-def";
char *sp;
x = strtok_r(s, "-", &sp); // x = "abc", sp = "=-def"
x = strtok_r(NULL, "-=", &sp); // x = "def", sp = NULL
x = strtok_r(NULL, "=", &sp); // x = NULL
// s = "abc\0-def\0"
char *
__strtok_r (char *s, const char *delim, char **save_ptr)
char *token;
if (s == NULL)
s = *save_ptr;
/* Scan leading delimiters. */
s += strspn (s, delim);
if (*s == '\0')
*save_ptr = s;
return NULL;
/* Find the end of the token. */
token = s;
s = strpbrk (token, delim);
if (s == NULL)
/* This token finishes the string. */
*save_ptr = __rawmemchr (token, '\0');
/* Terminate the token and make *SAVE_PTR point past it. */
*s = '\0';
*save_ptr = s + 1;
return token;
#ifdef weak_alias
libc_hidden_def (__strtok_r)
weak_alias (__strtok_r, strtok_r)