From 5a72c5058c27cdc778cde8f61d16691b11a6adc5 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Wed, 18 Dec 2019 12:57:32 +0100
Subject: Fix GEOHASH negative shifting in a more compatible way.

---
 src/geo.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'src/geo.c')

diff --git a/src/geo.c b/src/geo.c
index f47f4ee22..f7920a2e2 100644
--- a/src/geo.c
+++ b/src/geo.c
@@ -737,7 +737,15 @@ void geohashCommand(client *c) {
             char buf[12];
             int i;
             for (i = 0; i < 11; i++) {
-                int idx = (hash.bits >> (52-((i+1)*5))) & 0x1f;
+                int idx;
+                if (i == 10) {
+                    /* We have just 52 bits, but the API used to output
+                     * an 11 bytes geohash. For compatibility we assume
+                     * zero. */
+                    idx = 0;
+                } else {
+                    idx = (hash.bits >> (52-((i+1)*5))) & 0x1f;
+                }
                 buf[i] = geoalphabet[idx];
             }
             buf[11] = '\0';
-- 
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