From f56e2a1b3a00369ff8440555098047974458795c Mon Sep 17 00:00:00 2001
From: Scott Giese <scttgs0@gmail.com>
Date: Sun, 21 Feb 2021 16:02:50 -0600
Subject: [PATCH] Maintenance: nmea

overflow prevention
---
 src/Network/nmea.cxx | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/Network/nmea.cxx b/src/Network/nmea.cxx
index bd7af758a..f8565b88b 100644
--- a/src/Network/nmea.cxx
+++ b/src/Network/nmea.cxx
@@ -136,12 +136,12 @@ bool FGNMEA::gen_message()
 
     double altitude_ft = mFdm.get_Altitude();
 
-    char date[10];
+    char date[16];
     {
-        int year = t->getGmt()->tm_year;
-        while ( year >= 100 ) { year -= 100; }
-        snprintf( date, sizeof(date), "%02d%02d%02d", t->getGmt()->tm_mday,
-             t->getGmt()->tm_mon+1, year );
+        unsigned short tm_mday = t->getGmt()->tm_mday;
+        unsigned short tm_mon = t->getGmt()->tm_mon + 1;
+        unsigned short tm_year = t->getGmt()->tm_year % 100;
+        snprintf(date, sizeof(date), "%02u%02u%02u", tm_mday, tm_mon, tm_year);
     }
 
     char magvar[10];