areadlink, areadlink-with-size: add tests

[gnulib.git] / tests / test-areadlink.h

diff --git a/tests/test-areadlink.h b/tests/test-areadlink.h
new file mode 100644 (file)
index 0000000..1da2e1b
--- /dev/null
+++ b/tests/test-areadlink.h
@@ -0,0 +1,84 @@
+/* Tests of areadlink and friends.
+   Copyright (C) 2009 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 <http://www.gnu.org/licenses/>.  */
+
+/* Written by Eric Blake <ebb9@byu.net>, 2009.  */
+
+/* This file is designed to test areadlink(a),
+   areadlink_with_size(a,b), and areadlinkat(AT_FDCWD,a).  FUNC is the
+   function to test; a length is always supplied, but may be ignored.
+   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_areadlink (char * (*func) (char const *, size_t), bool print)
+{
+  /* Sanity checks of failures.  Mingw lacks symlink, but areadlink can
+     still distinguish between various errors.  */
+  errno = 0;
+  ASSERT (func ("no_such", 1) == NULL);
+  ASSERT (errno == ENOENT);
+  errno = 0;
+  ASSERT (func ("no_such/", 1) == NULL);
+  ASSERT (errno == ENOENT);
+  errno = 0;
+  ASSERT (func ("", 1) == NULL);
+  ASSERT (errno == ENOENT);
+  errno = 0;
+  ASSERT (func (".", 1) == NULL);
+  ASSERT (errno == EINVAL);
+  errno = 0;
+  ASSERT (func ("./", 1) == NULL);
+  ASSERT (errno == EINVAL);
+  ASSERT (close (creat (BASE "file", 0600)) == 0);
+  errno = 0;
+  ASSERT (func (BASE "file", 1) == NULL);
+  ASSERT (errno == EINVAL);
+  errno = 0;
+  ASSERT (func (BASE "file/", 1) == NULL);
+  ASSERT (errno == ENOTDIR);
+  ASSERT (unlink (BASE "file") == 0);
+
+  /* Now test actual symlinks.  */
+  if (symlink (BASE "dir", BASE "link"))
+    {
+      if (print)
+        fputs ("skipping test: symlinks not supported on this filesystem\n",
+               stderr);
+      return 77;
+    }
+  ASSERT (mkdir (BASE "dir", 0700) == 0);
+  errno = 0;
+  ASSERT (func (BASE "link/", 1) == NULL);
+  ASSERT (errno == EINVAL);
+  {
+    /* Too small a guess is okay.  */
+    size_t len = strlen (BASE "dir");
+    char *buf = func (BASE "link", 1);
+    ASSERT (buf);
+    ASSERT (strcmp (buf, BASE "dir") == 0);
+    free (buf);
+    /* Too large a guess is okay.  */
+    buf = func (BASE "link", 10000000);
+    ASSERT (buf);
+    ASSERT (strcmp (buf, BASE "dir") == 0);
+    free (buf);
+  }
+  ASSERT (rmdir (BASE "dir") == 0);
+  ASSERT (unlink (BASE "link") == 0);
+
+  return 0;
+}