From b3da6aaad047268e13cd3c81c5d03ee0edcea867 Mon Sep 17 00:00:00 2001
From: drepper <drepper>
Date: Wed, 5 Nov 1997 23:52:21 +0000
Subject: [PATCH] Test "" and NULL argument handling.

---
 stdlib/test-canon.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/stdlib/test-canon.c b/stdlib/test-canon.c
index ffd6fa99d4..c239d50ae8 100644
--- 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);
 
+  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);
 
-- 
2.11.0