/* SPDX-License-Identifier: BSD-2-Clause */

/*
 *  COPYRIGHT (c) 1989-2011.
 *  On-Line Applications Research Corporation (OAR).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <unistd.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <time.h>
#include <stdint.h>
#include <math.h>

#include "fstest.h"
#include "fs_config.h"
#include <tmacros.h>

const char rtems_test_name[] = "FSLINK " FILESYSTEM;

/*
 * Test if the successful call works as expect
 */
static void link_test01 (void)
{
  char *name0 = "t0";
  char *name1 = "t1";
  char *name2 = "t2";


  int status;
  int fd;

  mode_t mode = 0644;
  struct stat statbuf;


  puts ("link creates hardlinks");
  fd = creat (name0, mode);
  status = close (fd);
  rtems_test_assert (status == 0);

  status = stat (name0, &statbuf);
  rtems_test_assert (status == 0);
  rtems_test_assert (statbuf.st_nlink == 1);

  puts ("test if the stat is the same");
  status = link (name0, name1);
  rtems_test_assert (status == 0);

  status = stat (name0, &statbuf);
  rtems_test_assert (status == 0);

  rtems_test_assert (S_ISREG (statbuf.st_mode));
  rtems_test_assert (statbuf.st_nlink == 2);

  status = stat (name1, &statbuf);
  rtems_test_assert (status == 0);

  rtems_test_assert (S_ISREG (statbuf.st_mode));
  rtems_test_assert (statbuf.st_nlink == 2);

  /*
   * link the file and check the nlink
   */
  status = link (name1, name2);
  rtems_test_assert (status == 0);

  status = stat (name0, &statbuf);
  rtems_test_assert (status == 0);

  rtems_test_assert (S_ISREG (statbuf.st_mode));
  rtems_test_assert (statbuf.st_nlink == 3);

  status = stat (name1, &statbuf);
  rtems_test_assert (status == 0);

  rtems_test_assert (S_ISREG (statbuf.st_mode));
  rtems_test_assert (statbuf.st_nlink == 3);

  status = stat (name2, &statbuf);
  rtems_test_assert (status == 0);

  rtems_test_assert (S_ISREG (statbuf.st_mode));
  rtems_test_assert (statbuf.st_nlink == 3);

  /*
   *  call chmod and chown and test.
   */
  puts ("chmod and chown");

  chown (name1, 65534, 65533);

  status = stat (name0, &statbuf);
  rtems_test_assert (status == 0);

  rtems_test_assert (S_ISREG (statbuf.st_mode));
  rtems_test_assert (statbuf.st_nlink == 3);
  rtems_test_assert (statbuf.st_uid = 65534);
  rtems_test_assert (statbuf.st_gid = 65533);

  status = stat (name1, &statbuf);
  rtems_test_assert (status == 0);

  rtems_test_assert (S_ISREG (statbuf.st_mode));
  rtems_test_assert (statbuf.st_nlink == 3);
  rtems_test_assert (statbuf.st_uid = 65534);
  rtems_test_assert (statbuf.st_gid = 65533);

  status = stat (name2, &statbuf);
  rtems_test_assert (status == 0);

  rtems_test_assert (S_ISREG (statbuf.st_mode));
  rtems_test_assert (statbuf.st_nlink == 3);
  rtems_test_assert (statbuf.st_uid = 65534);
  rtems_test_assert (statbuf.st_gid = 65533);

  /*
   *
   *  unlink then test if the nlink changes
   */
  puts ("unlink then stat the file ");

  status = unlink (name0);
  rtems_test_assert (status == 0);

  status = stat (name0, &statbuf);
  rtems_test_assert (status == -1);
  rtems_test_assert (errno = ENOENT);

  status = stat (name1, &statbuf);
  rtems_test_assert (status == 0);
  rtems_test_assert (S_ISREG (statbuf.st_mode));
  rtems_test_assert (statbuf.st_nlink == 2);

  status = stat (name2, &statbuf);
  rtems_test_assert (status == 0);
  rtems_test_assert (S_ISREG (statbuf.st_mode));
  rtems_test_assert (statbuf.st_nlink == 2);

  status = unlink (name1);
  rtems_test_assert (status == 0);

  status = unlink (name2);
  rtems_test_assert (status == 0);

}

void test (void)
{
  link_test01 ();
}