From a5a4c9184d7b2a92c9a2f507009319ea9747bb30 Mon Sep 17 00:00:00 2001
From: Philippe Teuwen <phil@teuwen.org>
Date: Wed, 15 Nov 2023 12:17:21 +0100
Subject: [PATCH] Fix compar_int

'uint64_t' - 'uint64_t' may overflow return type int.
cf https://stackoverflow.com/questions/36681906/c-qsort-doesnt-seem-to-work-with-unsigned-long
Thanks @xianglin1998 !
---
 src/mfoc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/mfoc.c b/src/mfoc.c
index e2545be..9887553 100644
--- a/src/mfoc.c
+++ b/src/mfoc.c
@@ -1198,7 +1198,9 @@ uint32_t median(denonce d)
 
 int compar_int(const void *a, const void *b)
 {
-  return (*(uint64_t *)b - * (uint64_t *)a);
+    if (*(uint64_t *)b == *(uint64_t *)a) return 0;
+    if (*(uint64_t *)b < * (uint64_t *)a) return 1;
+    return -1;
 }
 
 // Compare countKeys structure