From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Thu, 6 Jun 2013 14:30:37 +0000 (+0200)
Subject: Fix rounding in UTI_AddDoubleToTimeval with negative increments
X-Git-Tag: 1.28-pre1~42
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=62027f1b47ada22a910d02d7eb953d2e6a45bf84;p=thirdparty%2Fchrony.git

Fix rounding in UTI_AddDoubleToTimeval with negative increments
---

diff --git a/util.c b/util.c
index 3ae06d80..aedabebf 100644
--- a/util.c
+++ b/util.c
@@ -135,7 +135,8 @@ UTI_AddDoubleToTimeval(struct timeval *start,
      is too marginal here. */
 
   int_part = (long) increment;
-  frac_part = (long) (0.5 + 1.0e6 * (increment - (double)int_part));
+  increment = (increment - int_part) * 1.0e6;
+  frac_part = (long) (increment > 0.0 ? increment + 0.5 : increment - 0.5);
 
   end->tv_sec  = int_part  + start->tv_sec;
   end->tv_usec = frac_part + start->tv_usec;