[PATCH v5 3/4] libuuid: fix timestamp overflow for pre-1970 dates

[Kiran Rangoon <kiranrangoon0@gmail.com>]

Use int64_t arithmetic to correctly handle timestamps before Unix epoch.
This fixes the overflow that was causing UUID timestamps from 1582 to
appear as far-future dates. Update test expectations accordingly.

Signed-off-by: Kiran Rangoon <kiranrangoon0@gmail.com>
---
 libuuid/src/uuid_time.c       | 2 +-
 tests/expected/uuid/uuidparse | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libuuid/src/uuid_time.c b/libuuid/src/uuid_time.c
index 2f7c6652c..63179fd76 100644
--- a/libuuid/src/uuid_time.c
+++ b/libuuid/src/uuid_time.c
@@ -63,7 +63,7 @@ time_t __uuid_time(const uuid_t uu, struct timeval *ret_tv);
 static void gregorian_to_unix(uint64_t ts, struct timeval *tv)
 {
 	const uint64_t offset = 0x01B21DD213814000ULL;
-	uint64_t clock_reg = ts - offset;
+	int64_t clock_reg = (int64_t)(ts - offset);
 	tv->tv_sec = clock_reg / 10000000;
 	tv->tv_usec = (clock_reg % 10000000) / 10;
 }
diff --git a/tests/expected/uuid/uuidparse b/tests/expected/uuid/uuidparse
index 9edb05e4e..e44964b30 100644
--- a/tests/expected/uuid/uuidparse
+++ b/tests/expected/uuid/uuidparse
@@ -11,7 +11,7 @@ UUID                                  VARIANT   TYPE       TIME
 00000000-0000-3000-8000-000000000000  DCE       name-based 
 00000000-0000-4000-8000-000000000000  DCE       random     
 00000000-0000-5000-8000-000000000000  DCE       sha1-based 
-00000000-0000-6000-8000-000000000000  DCE       time-v6    60038-03-11 05:36:10,955161+00:00
+00000000-0000-6000-8000-000000000000  DCE       time-v6    1582-10-15 00:00:00,000000+00:00
 00000000-0000-0000-d000-000000000000  Microsoft            
 00000000-0000-1000-d000-000000000000  Microsoft            
 00000000-0000-2000-d000-000000000000  Microsoft            
-- 
2.47.3