From 164eee91cfdf18e870519099fbad388a6ccb85cf Mon Sep 17 00:00:00 2001
From: Allen Byrne <byrn@hdfgroup.org>
Date: Wed, 16 Aug 2017 15:01:29 -0500
Subject: HDFFV-10188 - Check for empty string first

---
 tools/lib/h5tools_ref.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/lib/h5tools_ref.c b/tools/lib/h5tools_ref.c
index e000080..16a949d 100644
--- a/tools/lib/h5tools_ref.c
+++ b/tools/lib/h5tools_ref.c
@@ -164,7 +164,8 @@ haddr_t
 ref_path_table_lookup(const char *thepath)
 {
     H5O_info_t  oi;
-
+    if((HDstrlen(thepath) == 0) || (thepath == NULL))
+        return HADDR_UNDEF;
     /* Allow lookups on the root group, even though it doesn't have any link info */
     if(HDstrcmp(thepath, "/")) {
         H5L_info_t  li;
-- 
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