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In certain degenerate situations on the FlightGear side when the flight

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model math blows up, the lat/lon could be nan.  Thus updateLocal() could
potentially called with nan arguments if FlightGear is reiniting from a
blown up state.  This is a bug in FlightGear, but I've added a simple
check to catch this so updateLocal() is robust if called under these
circumstances.
This commit is contained in:
curt 2001-12-05 22:31:03 +00:00
parent 2b12425a62
commit 74f10486bc
1 changed files with 21 additions and 2 deletions
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23
simgear/timing/sg_time.cxx
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@ -31,7 +31,6 @@
#include <errno.h> // for errno
#ifdef SG_HAVE_STD_INCLUDES
# include <cmath>
# include <cstdio>
# include <cstdlib>
# include <ctime>
@ -39,7 +38,6 @@
# include <math.h>
# include <stdio.h>
# include <stdlib.h>
# include <time.h>
#endif
#ifdef HAVE_SYS_TIMEB_H
@ -52,6 +50,8 @@
# include <sys/time.h> // for get/setitimer, gettimeofday, struct timeval
#endif
#include <math.h> // for NAN
#include <simgear/constants.h>
#include <simgear/debug/logstream.hxx>
#include <simgear/misc/sg_path.hxx>
@ -259,6 +259,25 @@ void SGTime::update( double lon, double lat, long int warp ) {
// Given lon/lat, update timezone information and local_offset
void SGTime::updateLocal( double lon, double lat, const string& root ) {
// sanity checking
if ( lon < SGD_PI || lon > SGD_PI ) {
// not within -180 ... 180
lon = 0.0;
}
if ( lat < SGD_PI * 0.5 || lat > SGD_PI * 0.5 ) {
// not within -90 ... 90
lat = 0.0;
}
if ( lon != lon ) {
// only true if lon == nan
SG_LOG( SG_EVENT, SG_ALERT, " Detected lon == nan, resetting to 0.0" );
lon = 0.0;
}
if ( lat != lat ) {
// only true if lat == nan
SG_LOG( SG_EVENT, SG_ALERT, " Detected lat == nan, resetting to 0.0" );
lat = 0.0;
}
time_t currGMT;
time_t aircraftLocalTime;
GeoCoord location( SGD_RADIANS_TO_DEGREES * lat, SGD_RADIANS_TO_DEGREES * lon );