libc: Add canonicalize_file_name function

Add canonicalize_file_name function and its related tests.
Required by elfutils and coreutils (readlink).

Signed-off-by: Salvatore Cro <salvatore.cro@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>

1 files changed, 75 insertions, 0 deletions

diff --git a/test/stdlib/test-canon2.c b/test/stdlib/test-canon2.c
new file mode 100644
index 000000000..f182e95ad
--- /dev/null
+++ b/test/stdlib/test-canon2.c
@@ -0,0 +1,75 @@
+/* Test for realpath/canonicalize function.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <string.h>
+
+
+/* Prototype for our test function.  */
+extern void do_prepare (int argc, char *argv[]);
+extern int do_test (int argc, char *argv[]);
+
+/* We have a preparation function.  */
+#define PREPARE do_prepare
+
+#include <test-skeleton.c>
+
+/* Name of the temporary files we create.  */
+char *name1;
+char *name2;
+
+/* Preparation.  */
+void
+do_prepare (int argc, char *argv[])
+{
+  size_t test_dir_len;
+
+  test_dir_len = strlen (test_dir);
+
+  /* Generate the circular symlinks.  */
+  name1 = malloc (test_dir_len + sizeof ("/canonXXXXXX"));
+  mempcpy (mempcpy (name1, test_dir, test_dir_len),
+	   "/canonXXXXXX", sizeof ("/canonXXXXXX"));
+  name2 = strdup (name1);
+
+  add_temp_file (mktemp (name1));
+  add_temp_file (mktemp (name2));
+}
+
+
+/* Run the test.  */
+int
+do_test (int argc, char *argv[])
+{
+  char *canon;
+
+  printf ("create symlinks from %s to %s and vice versa\n", name1, name2);
+  if (symlink (name1, name2) == -1
+      || symlink (name2, name1) == -1)
+    /* We cannot test this.  */
+    return 0;
+
+  /* Call the function.  This is equivalent the using `realpath' but the
+     function allocates the room for the result.  */
+  errno = 0;
+  canon = canonicalize_file_name (name1);
+
+  return canon != NULL || errno != ELOOP;
+}