Coverity fixes - unchecked return value

src/analysis/raster/qgsrastercalculator.cpp

@@ -160,6 +160,7 @@ int QgsRasterCalculator::processCalculation( QProgressDialog* p )
   QgsRasterMatrix resultMatrix;
 
   //read / write line by line
+  bool encounteredError = false;
   for ( int i = 0; i < mNumOutputRows; ++i )
   {
     if ( p )
@@ -178,7 +179,11 @@ int QgsRasterCalculator::processCalculation( QProgressDialog* p )
     {
       double sourceTransformation[6];
       GDALRasterBandH sourceRasterBand = mInputRasterBands[bufferIt.key()];
-      GDALGetGeoTransform( GDALGetBandDataset( sourceRasterBand ), sourceTransformation );
+      if ( !GDALGetGeoTransform( GDALGetBandDataset( sourceRasterBand ), sourceTransformation ) )
+      {
+        encounteredError = true;
+        break;
+      }
       //the function readRasterPart calls GDALRasterIO (and ev. does some conversion if raster transformations are not the same)
       readRasterPart( targetGeoTransform, 0, i, mNumOutputColumns, 1, sourceTransformation, sourceRasterBand, bufferIt.value()->data() );
     }
@@ -244,11 +249,11 @@ int QgsRasterCalculator::processCalculation( QProgressDialog* p )
     GDALClose( *datasetIt );
   }
 
-  if ( p && p->wasCanceled() )
+  if (( p && p->wasCanceled() ) || encounteredError )
   {
     //delete the dataset without closing (because it is faster)
     GDALDeleteDataset( outputDriver, TO8F( mOutputFile ) );
-    return 3;
+    return encounteredError ? 1 : 3;
   }
   GDALClose( outputDataset );
   CPLFree( resultScanLine );

src/app/qgscustomprojectiondialog.cpp

@@ -161,9 +161,8 @@ bool  QgsCustomProjectionDialog::deleteCRS( QString id )
     Q_ASSERT( myResult == SQLITE_OK );
   }
   myResult = sqlite3_prepare( myDatabase, mySql.toUtf8(), mySql.toUtf8().length(), &myPreparedStatement, &myTail );
-  sqlite3_step( myPreparedStatement );
   // XXX Need to free memory from the error msg if one is set
-  if ( myResult != SQLITE_OK )
+  if ( myResult != SQLITE_OK || sqlite3_step( myPreparedStatement ) != SQLITE_DONE )
   {
     QgsDebugMsg( QString( "failed to remove CRS from database in custom projection dialog: %1 [%2]" ).arg( mySql ).arg( sqlite3_errmsg( myDatabase ) ) );
   }
@@ -218,11 +217,11 @@ void  QgsCustomProjectionDialog::insertProjection( QString myProjectionAcronym )
                 + ")"
                 ;
         myResult = sqlite3_prepare( myDatabase, mySql.toUtf8(), mySql.length(), &myPreparedStatement, &myTail );
-        sqlite3_step( myPreparedStatement );
-        if ( myResult != SQLITE_OK )
+        if ( myResult != SQLITE_OK || sqlite3_step( myPreparedStatement ) != SQLITE_DONE )
         {
           QgsDebugMsg( QString( "Update or insert failed in custom projection dialog: %1 [%2]" ).arg( mySql ).arg( sqlite3_errmsg( myDatabase ) ) );
         }
+
         sqlite3_finalize( myPreparedStatement );
       }
 
@@ -279,9 +278,8 @@ bool QgsCustomProjectionDialog::saveCRS( QgsCoordinateReferenceSystem myCRS, QSt
       Q_ASSERT( myResult == SQLITE_OK );
     }
     myResult = sqlite3_prepare( myDatabase, mySql.toUtf8(), mySql.toUtf8().length(), &myPreparedStatement, &myTail );
-    sqlite3_step( myPreparedStatement );
     // XXX Need to free memory from the error msg if one is set
-    if ( myResult != SQLITE_OK )
+    if ( myResult != SQLITE_OK || sqlite3_step( myPreparedStatement ) != SQLITE_DONE )
     {
       QgsDebugMsg( QString( "failed to write to database in custom projection dialog: %1 [%2]" ).arg( mySql ).arg( sqlite3_errmsg( myDatabase ) ) );
     }

src/core/qgscoordinatereferencesystem.cpp

@@ -1512,13 +1512,12 @@ bool QgsCoordinateReferenceSystem::saveAsUserCRS( QString name )
   }
   QgsDebugMsg( QString( "Update or insert sql \n%1" ).arg( mySql ) );
   myResult = sqlite3_prepare( myDatabase, mySql.toUtf8(), mySql.toUtf8().length(), &myPreparedStatement, &myTail );
-  sqlite3_step( myPreparedStatement );
-
-  QgsMessageLog::logMessage( QObject::tr( "Saved user CRS [%1]" ).arg( toProj4() ), QObject::tr( "CRS" ) );
 
   qint64 return_id;
-  if ( myResult == SQLITE_OK )
+  if ( myResult == SQLITE_OK && sqlite3_step( myPreparedStatement ) == SQLITE_DONE )
   {
+    QgsMessageLog::logMessage( QObject::tr( "Saved user CRS [%1]" ).arg( toProj4() ), QObject::tr( "CRS" ) );
+
     return_id = sqlite3_last_insert_rowid( myDatabase );
     setInternalId( return_id );
 
@@ -1716,14 +1715,13 @@ int QgsCoordinateReferenceSystem::syncDb()
   {
     qCritical( "Could not begin transaction: %s [%s]\n", QgsApplication::srsDbFilePath().toLocal8Bit().constData(), sqlite3_errmsg( database ) );
     return -1;
-
   }
 
   // fix up database, if not done already //
   if ( sqlite3_exec( database, "alter table tbl_srs add noupdate boolean", 0, 0, 0 ) == SQLITE_OK )
-    sqlite3_exec( database, "update tbl_srs set noupdate=(auth_name='EPSG' and auth_id in (5513,5514,5221,2065,102067,4156,4818))", 0, 0, 0 );
+    ( void )sqlite3_exec( database, "update tbl_srs set noupdate=(auth_name='EPSG' and auth_id in (5513,5514,5221,2065,102067,4156,4818))", 0, 0, 0 );
 
-  sqlite3_exec( database, "UPDATE tbl_srs SET srid=141001 WHERE srid=41001 AND auth_name='OSGEO' AND auth_id='41001'", 0, 0, 0 );
+  ( void )sqlite3_exec( database, "UPDATE tbl_srs SET srid=141001 WHERE srid=41001 AND auth_name='OSGEO' AND auth_id='41001'", 0, 0, 0 );
 
   OGRSpatialReferenceH crs = OSRNewSpatialReference( NULL );
   const char *tail;

src/core/symbology-ng/qgsstylev2.cpp

@@ -620,7 +620,7 @@ int QgsStyleV2::addGroup( QString groupName, int parentid )
   sqlite3_stmt *ppStmt;
   int nErr = sqlite3_prepare_v2( mCurrentDB, query, -1, &ppStmt, NULL );
   if ( nErr == SQLITE_OK )
-    sqlite3_step( ppStmt );
+    ( void )sqlite3_step( ppStmt );
 
   sqlite3_finalize( ppStmt );
 
@@ -636,7 +636,7 @@ int QgsStyleV2::addTag( QString tagname )
   char *query = sqlite3_mprintf( "INSERT INTO tag VALUES (NULL, '%q')", tagname.toUtf8().constData() );
   int nErr = sqlite3_prepare_v2( mCurrentDB, query, -1, &ppStmt, NULL );
   if ( nErr == SQLITE_OK )
-    sqlite3_step( ppStmt );
+    ( void )sqlite3_step( ppStmt );
   sqlite3_finalize( ppStmt );
 
   return ( int )sqlite3_last_insert_rowid( mCurrentDB );

src/gui/qgsprojectionselector.cpp

@@ -581,22 +581,14 @@ void QgsProjectionSelector::loadCrsList( QSet<QString> *crsFilter )
     showDBMissingWarning( mSrsDatabaseFileName );
     return;
   }
-  // prepare the sql statement
+
   const char *tail;
   sqlite3_stmt *stmt;
-  // get total count of records in the projection table
-  QString sql = "select count(*) from tbl_srs";
-
-  rc = sqlite3_prepare( database, sql.toUtf8(), sql.toUtf8().length(), &stmt, &tail );
-  Q_ASSERT( rc == SQLITE_OK );
-  sqlite3_step( stmt );
-  sqlite3_finalize( stmt );
-
   // Set up the query to retrieve the projection information needed to populate the list
   //note I am giving the full field names for clarity here and in case someone
   //changes the underlying view TS
-  sql = QString( "select description, srs_id, upper(auth_name||':'||auth_id), is_geo, name, parameters, deprecated from vw_srs where %1 order by name,description" )
-        .arg( sqlFilter );
+  QString sql = QString( "select description, srs_id, upper(auth_name||':'||auth_id), is_geo, name, parameters, deprecated from vw_srs where %1 order by name,description" )
+                .arg( sqlFilter );
 
   rc = sqlite3_prepare( database, sql.toUtf8(), sql.toUtf8().length(), &stmt, &tail );
   // XXX Need to free memory from the error msg if one is set

src/gui/symbology-ng/qgsellipsesymbollayerv2widget.cpp

@@ -71,7 +71,7 @@ QgsEllipseSymbolLayerV2Widget::QgsEllipseSymbolLayerV2Widget( const QgsVectorLay
 
 void QgsEllipseSymbolLayerV2Widget::setSymbolLayer( QgsSymbolLayerV2* layer )
 {
-  if ( layer && layer->layerType() != "EllipseMarker" )
+  if ( !layer || layer->layerType() != "EllipseMarker" )
   {
     return;
   }

src/plugins/evis/databaseconnection/evisdatabaseconnectiongui.cpp

@@ -478,7 +478,7 @@ void eVisDatabaseConnectionGui::on_pbtnRunQuery_clicked()
       else if ( myResults->isSelect() )
       {
         //if valid and a select query, save results into temporary file and load as layer
-        myResults->next();
+        ( void )myResults->next();
         if ( myResults->isValid() )
         {
           mTempOutputFileList->append( new QTemporaryFile() );
@@ -519,7 +519,7 @@ void eVisDatabaseConnectionGui::on_pbtnRunQuery_clicked()
                 }
               }
               outputStream << endl;
-              myResults->next();
+              ( void )myResults->next();
             }
             mTempOutputFileList->last()->close();
             mDatabaseLayerFieldSelector->setFieldList( &fieldList );

src/providers/gdal/qgsgdalprovider.cpp

@@ -2486,7 +2486,7 @@ void QgsGdalProvider::initBaseDataset()
     }
     else
     {
-      GDALGetGeoTransform( mGdalDataset, mGeoTransform );
+      hasGeoTransform = GDALGetGeoTransform( mGdalDataset, mGeoTransform );
     }
   }
   else

src/providers/spatialite/qgsspatialiteconnection.cpp

@@ -761,7 +761,7 @@ QgsSqliteHandle* QgsSqliteHandle::openDb( const QString & dbPath, bool shared )
     return NULL;
   }
   // activating Foreign Key constraints
-  sqlite3_exec( sqlite_handle, "PRAGMA foreign_keys = 1", NULL, 0, NULL );
+  ( void )sqlite3_exec( sqlite_handle, "PRAGMA foreign_keys = 1", NULL, 0, NULL );
 
   QgsDebugMsg( "Connection to the database was successful" );
 

src/providers/spatialite/qgsspatialiteprovider.cpp

@@ -3709,7 +3709,7 @@ bool QgsSpatiaLiteProvider::addFeatures( QgsFeatureList & flist )
     if ( toCommit )
     {
       // ROLLBACK after some previous error
-      sqlite3_exec( sqliteHandle, "ROLLBACK", NULL, NULL, NULL );
+      ( void )sqlite3_exec( sqliteHandle, "ROLLBACK", NULL, NULL, NULL );
     }
   }
 
@@ -3788,7 +3788,7 @@ bool QgsSpatiaLiteProvider::deleteFeatures( const QgsFeatureIds &id )
   if ( toCommit )
   {
     // ROLLBACK after some previous error
-    sqlite3_exec( sqliteHandle, "ROLLBACK", NULL, NULL, NULL );
+    ( void )sqlite3_exec( sqliteHandle, "ROLLBACK", NULL, NULL, NULL );
   }
 
   return false;
@@ -3854,7 +3854,7 @@ bool QgsSpatiaLiteProvider::addAttributes( const QList<QgsField> &attributes )
   if ( toCommit )
   {
     // ROLLBACK after some previous error
-    sqlite3_exec( sqliteHandle, "ROLLBACK", NULL, NULL, NULL );
+    ( void )sqlite3_exec( sqliteHandle, "ROLLBACK", NULL, NULL, NULL );
   }
 
   return false;
@@ -3960,7 +3960,7 @@ bool QgsSpatiaLiteProvider::changeAttributeValues( const QgsChangedAttributesMap
   if ( toCommit )
   {
     // ROLLBACK after some previous error
-    sqlite3_exec( sqliteHandle, "ROLLBACK", NULL, NULL, NULL );
+    ( void )sqlite3_exec( sqliteHandle, "ROLLBACK", NULL, NULL, NULL );
   }
 
   return false;