From: Kiran Rangoon <kiranrangoon0@gmail.com>
Date: Mon, 29 Dec 2025 03:50:57 +0000 (-0500)
Subject: libuuid: simplify gregorian-to-unix offset calculation
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75899c802366466ee988c0080202719bbd97747d;p=thirdparty%2Futil-linux.git

libuuid: simplify gregorian-to-unix offset calculation

Replace complex bit-shift offset calculation with a simple constant
definition for better readability and maintainability.

Signed-off-by: Kiran Rangoon <kiranrangoon0@gmail.com>
Reviewed-by: Thomas Weißschuh <thomas@t-8ch.de>
---

diff --git a/libuuid/src/uuid_time.c b/libuuid/src/uuid_time.c
index c7516152b..e2b991d74 100644
--- a/libuuid/src/uuid_time.c
+++ b/libuuid/src/uuid_time.c
@@ -62,7 +62,8 @@ time_t __uuid_time(const uuid_t uu, struct timeval *ret_tv);
 
 static uint64_t gregorian_to_unix(uint64_t ts)
 {
-	return ts - ((((uint64_t) 0x01B21DD2) << 32) + 0x13814000);
+	const uint64_t offset = 0x01B21DD213814000ULL;
+	return ts - offset;
 }
 
 static void uuid_time_v1(const struct uuid *uuid, struct timeval *tv)