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 );
 }