From 082bac1492c1aec8ac0fbe8cc10ac3f46424b836 Mon Sep 17 00:00:00 2001
From: Howard Chu <hyc@symas.com>
Date: Thu, 24 Jul 2014 04:13:55 -0700
Subject: [PATCH] more for mdb_cursor_count

return MDB_NOTFOUND if the cursor is empty
---
 libraries/liblmdb/mdb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 3e62b2e..84477c4 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -6962,6 +6962,9 @@ mdb_cursor_count(MDB_cursor *mc, size_t *countp)
 	if (!(mc->mc_flags & C_INITIALIZED))
 		return EINVAL;
 
+	if (!mc->mc_snum || (mc->mc_flags & C_EOF))
+		return MDB_NOTFOUND;
+
 	leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
 	if (!F_ISSET(leaf->mn_flags, F_DUPDATA)) {
 		*countp = 1;