Fix to prevent division by 0

from Mark Hsu

1 files changed, 2 insertions, 1 deletions

diff --git a/noncore/settings/netsystemtime/predicttabwidget.cpp b/noncore/settings/netsystemtime/predicttabwidget.cpp
index 8dc889f..a9fe418 100644
--- a/noncore/settings/netsystemtime/predicttabwidget.cpp
+++ b/noncore/settings/netsystemtime/predicttabwidget.cpp
@@ -75,93 +75,94 @@ PredictTabWidget::PredictTabWidget( QWidget *parent )
 	tblLookups = new QTable( 2, 3, this );
 	QFont font(  tblLookups->font() );
 	font.setPointSize( 7 );
 	tblLookups->setFont( font );
 	tblLookups->horizontalHeader()->setLabel( 0, tr( "Shift [s/h]" ) );
 	tblLookups->horizontalHeader()->setLabel( 1, tr( "Last [h]" ) );
 	tblLookups->horizontalHeader()->setLabel( 2, tr( "Offset [s]" ) );
 	tblLookups->setColumnWidth( 0, 78 );
 	tblLookups->setColumnWidth( 1, 50 );
 	tblLookups->setColumnWidth( 2, 50 );
 	tblLookups->setMinimumHeight( 50 );
 	tblLookups->setSizePolicy( QSizePolicy( QSizePolicy::Preferred, QSizePolicy::Maximum ) );
 	layout->addMultiCellWidget( tblLookups, 3, 3, 0, 1 );
 
 	// Predict time button
 	QPushButton *pb = new QPushButton( tr( "Predict time" ), this );
 	connect( pb, SIGNAL(clicked()), this, SLOT(slotPredictTime()) );
 	layout->addWidget( pb, 4, 0 );
 
 	// Set predicted time button
 	pb = new QPushButton( tr( "Set predicted time" ), this );
 	connect( pb, SIGNAL(clicked()), this, SLOT(slotSetPredictedTime()) );
 	layout->addWidget( pb, 4, 1 );
 
 	// Initialize values
 	Config config( "ntp" );
 	config.setGroup( "lookups" );
 	int lookupCount = config.readNumEntry( "count", 0 );
 	float last, shift, shiftPerSec;
 	tblLookups->setNumRows( lookupCount );
 	int cw = tblLookups->width() / 4;
 	cw = 50;
 	tblLookups->sortColumn( 0, FALSE, TRUE );
 	_shiftPerSec = 0;
 	QString grpname;
 	for ( int i=0; i < lookupCount; i++ )
 	{
 		grpname = "lookup_";
 		grpname.append( QString::number( i ) );
 		config.setGroup( grpname );
 		last = config.readEntry( "secsSinceLast", 0 ).toFloat();
 		shift = QString( config.readEntry( "timeShift", 0 ) ).toFloat();
 		shiftPerSec =  shift / last;
 		_shiftPerSec += shiftPerSec;
 		tblLookups->setText( i, 0, QString::number( shiftPerSec * 60 * 60 ) );
 		tblLookups->setText( i, 2, QString::number( shift ) );
 		tblLookups->setText( i, 1, QString::number( last / ( 60 * 60 ) ) );
 	}
-	_shiftPerSec /= lookupCount;
+        if(lookupCount)
+	    _shiftPerSec /= lookupCount;
 	QString drift = QString::number( _shiftPerSec * 60 * 60);
 	drift.append( tr( " s/h" ) );
 	lblDrift->setText( drift );
 
 	Config lconfig( "locale" );
 	lconfig.setGroup( "Location" );
 	tz = lconfig.readEntry( "Timezone", "America/New_York" );
 }
 
 PredictTabWidget::~PredictTabWidget()
 {
 }
 
 void PredictTabWidget::setShiftPerSec( int i )
 {
 	_shiftPerSec += i;
 }
 
 void PredictTabWidget::slotTZChanged( const QString &newtz )
 {
 	tz = newtz;
 }
 
 void PredictTabWidget::slotPredictTime()
 {
 	Config config( "ntp" );
 	config.setGroup( "lookups" );
 	int lastTime = config.readNumEntry( "time", 0 );
 	config.writeEntry( "lastNtp", TRUE );
 	setenv( "TZ", tz, 1 );
 	int now = TimeConversion::toUTC( QDateTime::currentDateTime() );
 	int corr = int( ( now - lastTime ) * _shiftPerSec );
 	QString diff = QString::number( corr );
 	diff.append( tr( " seconds" ) );
 	lblDiff->setText( diff );
 	predictedTime = QDateTime::currentDateTime().addSecs( corr );
 	lblPredicted->setText( predictedTime.toString() );
 }
 
 void PredictTabWidget::slotSetPredictedTime()
 {
 	slotPredictTime();
 	emit setTime( predictedTime );
 }