Test "" and NULL argument handling.

diff --git a/stdlib/test-canon.c b/stdlib/test-canon.c
index ffd6fa9..c239d50 100644 (file)
--- a/stdlib/test-canon.c
+++ b/stdlib/test-canon.c
@@ -117,6 +117,30 @@ main (int argc, char ** argv)
   getcwd (cwd, sizeof(buf));
   cwd_len = strlen (cwd);
 
   getcwd (cwd, sizeof(buf));
   cwd_len = strlen (cwd);
 

+  errno = 0;
+  if (realpath (NULL, buf) != NULL || errno != EINVAL)
+    {
+      printf ("%s: expected return value NULL and errno set to EINVAL"
+             " for realpath(NULL,...)\n", argv[0]);
+      ++errors;
+    }
+
+  errno = 0;
+  if (realpath ("/", NULL) != NULL || errno != EINVAL)
+    {
+      printf ("%s: expected return value NULL and errno set to EINVAL"
+             " for realpath(...,NULL)\n", argv[0]);
+      ++errors;
+    }
+
+  errno = 0;
+  if (realpath ("", buf) != NULL || errno != ENOENT)
+    {
+      printf ("%s: expected return value NULL and set errno to ENOENT",
+             " for realpath(\"\",...)\n", argv[0]);
+      ++errors;
+    }
+

   for (i = 0; i < (int) (sizeof (symlinks) / sizeof (symlinks[0])); ++i)
     symlink (symlinks[i].value, symlinks[i].name);
 
   for (i = 0; i < (int) (sizeof (symlinks) / sizeof (symlinks[0])); ++i)
     symlink (symlinks[i].value, symlinks[i].name);