/*

 * Copyright (C) 2010-2017 Free Software Foundation, Inc.

 * Written by Eric Blake

 *

 * 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

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

#include <config.h>

#include <string.h>

#include "signature.h"

SIGNATURE_CHECK (strnlen, size_t, (char const *, size_t));

#include <stdlib.h>

#include "zerosize-ptr.h"

#include "macros.h"

int

main (void)

{

  size_t i;

  char *page_boundary = (char *) zerosize_ptr ();

  if (!page_boundary)

    {

      page_boundary = malloc (0x1000);

      ASSERT (page_boundary);

      page_boundary += 0x1000;

    }

  /* Basic behavior tests.  */

  ASSERT (strnlen ("a", 0) == 0);

  ASSERT (strnlen ("a", 1) == 1);

  ASSERT (strnlen ("a", 2) == 1);

  ASSERT (strnlen ("", 0x100000) == 0);

  /* Memory fence and alignment testing.  */

  for (i = 0; i < 512; i++)

    {

      char *start = page_boundary - i;

      size_t j = i;

      memset (start, 'x', i);

      do

        {

          if (i != j)

            {

              start[j] = 0;

              ASSERT (strnlen (start, i + j) == j);

            }

          ASSERT (strnlen (start, i) == j);

          ASSERT (strnlen (start, j) == j);

        }

      while (j--);

    }

  return 0;

}