/* Copyright (C) 2005-2018 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 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.

   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

   Lesser General Public License for more details.

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

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <limits.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

char *

__realpath_chk (const char *buf, char *resolved, size_t resolvedlen)

{

#ifdef PATH_MAX

  if (resolvedlen < PATH_MAX)

    __chk_fail ();

  return __realpath (buf, resolved);

#else

  long int pathmax =__pathconf (buf, _PC_PATH_MAX);

  if (pathmax != -1)

    {

      /* We do have a fixed limit.  */

      if (resolvedlen < pathmax)

	__chk_fail ();

      return __realpath (buf, resolved);

    }

  /* Since there is no fixed limit we check whether the size is large

     enough.  */

  char *res = __realpath (buf, NULL);

  if (res != NULL)

    {

      size_t actlen = strlen (res) + 1;

      if (actlen > resolvedlen)

	__chk_fail ();

      memcpy (resolved, res, actlen);

      free (res);

      res = resolved;

    }

  return res;

#endif

}