From 8c8c86038a634559c7ec856a4cdad5f0e31bc400 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Tue, 12 May 2020 23:32:06 +0300
Subject: [PATCH] mdbx: fix unsigned-to-ptrdiff casting inside estimate().

Fixup after a238179c23e7378b2019de5229b2166cdfe515c7

Change-Id: I316e4aa1f41462fd0017f8e0a7f6d6e82aa4f3db
---
 src/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core.c b/src/core.c
index 395f49fb..c11f8b04 100644
--- a/src/core.c
+++ b/src/core.c
@@ -17670,7 +17670,7 @@ __hot static ptrdiff_t estimate(const MDBX_db *db,
    *     level-N: branch-page(s) => scale = leaf-factor
    *  leaf-level: leaf-page(s)   => scale = 1
    */
-  ptrdiff_t btree_power = db->md_depth - 2 - dr->level;
+  ptrdiff_t btree_power = (ptrdiff_t)db->md_depth - 2 - (ptrdiff_t)dr->level;
   if (btree_power < 0)
     return dr->diff;