/* Reentrant string tokenizer.  Generic version.

   Copyright (C) 1991, 1996-1999, 2001, 2004, 2007, 2009-2020 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 Lesser General Public License as published by

   the Free Software Foundation; either version 2.1 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

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License

   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#include <string.h>

#ifdef _LIBC

# undef strtok_r

# undef __strtok_r

#else

# 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