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/* Copyright (C) 1991 Free Software Foundation, Inc.

This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public License as

published by the Free Software Foundation; either version 2 of the

License, or (at your option) any later version.

The GNU C Library 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

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with the GNU C Library; see the file COPYING.LIB.  If

not, write to the Free Software Foundation, Inc., 675 Mass Ave,

Cambridge, MA 02139, USA.  */

#include <string.h>

static char *olds = 0;

/* Parse S into tokens separated by characters in DELIM.

   If S is NULL, the last string strtok() was called with is

   used.  For example:

        char s[] = "-abc=-def";

        x = strtok(s, "-");             // x = "abc"

        x = strtok(NULL, "=-");         // x = "def"

        x = strtok(NULL, "=");          // x = NULL

                // s = "abc\0-def\0"

*/

char *

strtok(s, delim)

register char *s;

register char *delim;

{

  char *token;

  if (s == 0)

    {

      if (olds == 0)

        {

          return 0;

        }

      else

        s = olds;

    }

  /* Scan leading delimiters.  */

  s += strspn(s, delim);

  if (*s == '\0')

    {

      olds = 0;

      return 0;

    }

  /* Find the end of the token.  */

  token = s;

  s = strpbrk(token, delim);

  if (s == 0)

    /* This token finishes the string.  */

    olds = 0;

  else

    {

      /* Terminate the token and make OLDS point past it.  */

      *s = '\0';

      olds = s + 1;

    }

  return token;

}