strtok_r.c
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/* Reentrant string tokenizer. Generic version.
Copyright (C) 1991,1996-1999,2001,2004 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 2, 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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#undef strtok_r
#undef __strtok_r
#ifndef _LIBC
/* Get specification. */
# include "strtok_r.h"
# define __strtok_r strtok_r
# define __rawmemchr strchr
#endif
/* 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');
else
{
/* 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)
#endif