From 117b7d5c47f31b02cf891c792f919afceaddd080 Mon Sep 17 00:00:00 2001
From: matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 18 Dec 2000 09:46:21 +0000
Subject: matz

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@1065 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 time.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'time.c')

diff --git a/time.c b/time.c
index 0e2fa0f97b..2ef06eb6f7 100644
--- a/time.c
+++ b/time.c
@@ -659,6 +659,10 @@ time_plus(time1, time2)
 	sec++;
 	usec -= 1000000;
     }
+    if (usec < 0) {		/* usec underflow */
+	sec--;
+	usec += 1000000;
+    }
     time2 = rb_time_new(sec, usec);
     if (tobj->gmt) {
 	GetTimeval(time2, tobj);
-- 
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