/* Test of lstat() function.

   Copyright (C) 2008-2019 Free Software Foundation, Inc.

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

/* Written by Simon Josefsson, 2008; and Eric Blake, 2009.  */

/* This file is designed to test both lstat(n,buf) and

   fstatat(AT_FDCWD,n,buf,AT_SYMLINK_NOFOLLOW).  FUNC is the function

   to test.  Assumes that BASE and ASSERT are already defined, and

   that appropriate headers are already included.  If PRINT, warn

   before skipping symlink tests with status 77.  */

static int

test_lstat_func (int (*func) (char const *, struct stat *), bool print)

{

  struct stat st1;

  struct stat st2;

  /* Test for common directories.  */

  ASSERT (func (".", &st1) == 0);

  ASSERT (func ("./", &st2) == 0);

  ASSERT (SAME_INODE (st1, st2));

  ASSERT (S_ISDIR (st1.st_mode));

  ASSERT (S_ISDIR (st2.st_mode));

  ASSERT (func ("/", &st1) == 0);

  ASSERT (func ("///", &st2) == 0);

  ASSERT (SAME_INODE (st1, st2));

  ASSERT (S_ISDIR (st1.st_mode));

  ASSERT (S_ISDIR (st2.st_mode));

  ASSERT (func ("..", &st1) == 0);

  ASSERT (S_ISDIR (st1.st_mode));

  /* Test for error conditions.  */

  errno = 0;

  ASSERT (func ("", &st1) == -1);

  ASSERT (errno == ENOENT);

  errno = 0;

  ASSERT (func ("nosuch", &st1) == -1);

  ASSERT (errno == ENOENT);

  errno = 0;

  ASSERT (func ("nosuch/", &st1) == -1);

  ASSERT (errno == ENOENT);

  ASSERT (close (creat (BASE "file", 0600)) == 0);

  ASSERT (func (BASE "file", &st1) == 0);

  ASSERT (S_ISREG (st1.st_mode));

  errno = 0;

  ASSERT (func (BASE "file/", &st1) == -1);

  ASSERT (errno == ENOTDIR);

  /* Now for some symlink tests, where supported.  We set up:

     link1 -> directory

     link2 -> file

     link3 -> dangling

     link4 -> loop

     then test behavior both with and without trailing slash.

  */

  if (symlink (".", BASE "link1") != 0)

    {

      ASSERT (unlink (BASE "file") == 0);

      if (print)

        fputs ("skipping test: symlinks not supported on this file system\n",

               stderr);

      return 77;

    }

  ASSERT (symlink (BASE "file", BASE "link2") == 0);

  ASSERT (symlink (BASE "nosuch", BASE "link3") == 0);

  ASSERT (symlink (BASE "link4", BASE "link4") == 0);

  ASSERT (func (BASE "link1", &st1) == 0);

  ASSERT (S_ISLNK (st1.st_mode));

  ASSERT (func (BASE "link1/", &st1) == 0);

  ASSERT (stat (BASE "link1", &st2) == 0);

  ASSERT (S_ISDIR (st1.st_mode));

  ASSERT (S_ISDIR (st2.st_mode));

  ASSERT (SAME_INODE (st1, st2));

  ASSERT (func (BASE "link2", &st1) == 0);

  ASSERT (S_ISLNK (st1.st_mode));

  errno = 0;

  ASSERT (func (BASE "link2/", &st1) == -1);

  ASSERT (errno == ENOTDIR);

  ASSERT (func (BASE "link3", &st1) == 0);

  ASSERT (S_ISLNK (st1.st_mode));

  errno = 0;

  ASSERT (func (BASE "link3/", &st1) == -1);

  ASSERT (errno == ENOENT);

  ASSERT (func (BASE "link4", &st1) == 0);

  ASSERT (S_ISLNK (st1.st_mode));

  errno = 0;

  ASSERT (func (BASE "link4/", &st1) == -1);

  ASSERT (errno == ELOOP);

  /* Cleanup.  */

  ASSERT (unlink (BASE "file") == 0);

  ASSERT (unlink (BASE "link1") == 0);

  ASSERT (unlink (BASE "link2") == 0);

  ASSERT (unlink (BASE "link3") == 0);

  ASSERT (unlink (BASE "link4") == 0);

  return 0;

}