use class to temporary override locale to C

src/core/CMakeLists.txt

@@ -186,6 +186,7 @@ SET(QGIS_CORE_SRCS
   qgsvectorsimplifymethod.cpp
   qgsxmlutils.cpp
   qgsslconnect.cpp
+  qgslocalec.cpp
 
   composer/qgsaddremoveitemcommand.cpp
   composer/qgsaddremovemultiframecommand.cpp
@@ -603,6 +604,7 @@ SET(QGIS_CORE_HDRS
   qgswebpage.h
   qgswebframe.h
   qgswebview.h
+  qgslocalec.h
 
   diagram/qgsdiagram.h
   diagram/qgspiediagram.h

src/core/qgscoordinatereferencesystem.cpp

@@ -34,6 +34,7 @@
 #include "qgslogger.h"
 #include "qgsmessagelog.h"
 #include "qgis.h" //const vals declared here
+#include "qgslocalec.h"
 
 #include <sqlite3.h>
 #include <proj_api.h>
@@ -921,26 +922,18 @@ void QgsCoordinateReferenceSystem::setDescription( QString theDescription )
 void QgsCoordinateReferenceSystem::setProj4String( QString theProj4String )
 {
   mProj4 = theProj4String;
-  char *oldlocale = setlocale( LC_NUMERIC, NULL );
-  /* the next setlocale() invalides the return of previous setlocale() */
-  if ( oldlocale )
-    oldlocale = strdup( oldlocale );
 
-  setlocale( LC_NUMERIC, "C" );
+  QgsLocaleNumC l;
+
   OSRDestroySpatialReference( mCRS );
   mCRS = OSRNewSpatialReference( NULL );
-  mIsValidFlag =
-    OSRImportFromProj4( mCRS, theProj4String.trimmed().toLatin1().constData() )
-    == OGRERR_NONE;
+  mIsValidFlag = OSRImportFromProj4( mCRS, theProj4String.trimmed().toLatin1().constData() ) == OGRERR_NONE;
   mWkt.clear();
   setMapUnits();
 
 #if defined(QGISDEBUG) && QGISDEBUG>=3
   debugPrint();
 #endif
-
-  setlocale( LC_NUMERIC, oldlocale );
-  free( oldlocale );
 }
 void QgsCoordinateReferenceSystem::setGeographicFlag( bool theGeoFlag )
 {

src/core/qgslocalec.cpp

@@ -0,0 +1,43 @@
+/***************************************************************************
+                          qgslocalec.h - temporary C numeric locale
+                          -------------------
+    begin                : Jun 15th 2015
+    copyright            : (C) 2015 by Juergen E. Fischer
+    email                : jef at norbit dot de
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include <qgslocalec.h>
+
+#include <locale.h>
+#include <QByteArray>
+
+QMutex QgsLocaleNumC::sLocaleLock;
+
+QgsLocaleNumC::QgsLocaleNumC()
+{
+  sLocaleLock.lock();
+
+  mOldlocale = setlocale( LC_NUMERIC, NULL );
+  if ( mOldlocale )
+    mOldlocale = qstrdup( mOldlocale );
+
+  setlocale( LC_NUMERIC, "C" );
+}
+
+QgsLocaleNumC::~QgsLocaleNumC()
+{
+  setlocale( LC_NUMERIC, mOldlocale );
+  if ( mOldlocale )
+    delete [] mOldlocale;
+
+  sLocaleLock.unlock();
+}

src/core/qgslocalec.h

@@ -0,0 +1,34 @@
+/***************************************************************************
+                          qgslocalec.h - temporary C numeric locale
+                             -------------------
+    begin                : Jun 15th 2015
+    copyright            : (C) 2015 by Juergen E. Fischer
+    email                : jef at norbit dot de
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef QGSLOCALENUMC_H
+#define QGSLOCALENUMC_H
+
+#include <QMutex>
+
+class CORE_EXPORT QgsLocaleNumC
+{
+    char *mOldlocale;
+    static QMutex sLocaleLock;
+
+  public:
+    QgsLocaleNumC();
+    ~QgsLocaleNumC();
+
+};
+
+#endif // QGSLOCALENUMC_H

src/core/qgsvectorfilewriter.cpp

@@ -27,6 +27,7 @@
 #include "qgsrendererv2.h"
 #include "qgssymbollayerv2.h"
 #include "qgsvectordataprovider.h"
+#include "qgslocalec.h"
 
 #include <QFile>
 #include <QSettings>
@@ -1625,6 +1626,8 @@ bool QgsVectorFileWriter::addFeature( QgsFeature& feature, QgsFeatureRendererV2*
 
 OGRFeatureH QgsVectorFileWriter::createFeature( QgsFeature& feature )
 {
+  QgsLocaleNumC l;
+
   OGRFeatureH poFeature = OGR_F_Create( OGR_L_GetLayerDefn( mLayer ) );
 
   qint64 fid = FID_TO_NUMBER( feature.id() );

src/plugins/grass/qgsgrassnewmapset.cpp

@@ -25,6 +25,7 @@
 #include "qgsmapcanvas.h"
 #include "qgsproject.h"
 #include "qgsprojectionselector.h"
+#include "qgslocalec.h"
 
 #include <QCloseEvent>
 #include <QFileDialog>
@@ -427,10 +428,12 @@ void QgsGrassNewMapset::setGrassProjection()
     OGRSpatialReferenceH hCRS = NULL;
     hCRS = OSRNewSpatialReference( NULL );
     int errcode;
-    const char *oldlocale = setlocale( LC_NUMERIC, NULL );
-    setlocale( LC_NUMERIC, "C" );
-    errcode = OSRImportFromProj4( hCRS, proj4.toUtf8() );
-    setlocale( LC_NUMERIC, oldlocale );
+
+    {
+      QgsLocaleNumC l;
+      errcode = OSRImportFromProj4( hCRS, proj4.toUtf8() );
+    }
+
     if ( errcode != OGRERR_NONE )
     {
       QgsDebugMsg( QString( "OGR can't parse PROJ.4-style parameter string:\n%1\nOGR Error code was %2" ).arg( proj4 ).arg( errcode ) );

src/providers/grass/qgsgrass.cpp

@@ -29,6 +29,7 @@
 #include "qgsfield.h"
 #include "qgsrectangle.h"
 #include "qgsconfig.h"
+#include "qgslocalec.h"
 
 #include <QFileDialog>
 #include <QMessageBox>
@@ -1723,31 +1724,29 @@ QgsCoordinateReferenceSystem GRASS_LIB_EXPORT QgsGrass::crsDirect( const QString
   QgsGrass::resetError();
   QgsGrass::setLocation( gisdbase, location );
 
-  const char *oldlocale = setlocale( LC_NUMERIC, NULL );
-  setlocale( LC_NUMERIC, "C" );
-
-  G_TRY
-  {
-    G_get_default_window( &cellhd );
-  }
-  G_CATCH( QgsGrass::Exception &e )
   {
-    Q_UNUSED( e );
-    setlocale( LC_NUMERIC, oldlocale );
-    QgsDebugMsg( QString( "Cannot get default window: %1" ).arg( e.what() ) );
-    return QgsCoordinateReferenceSystem();
-  }
+    QgsLocaleNumC l;
 
-  if ( cellhd.proj != PROJECTION_XY )
-  {
-    struct Key_Value *projinfo = G_get_projinfo();
-    struct Key_Value *projunits = G_get_projunits();
-    char *wkt = GPJ_grass_to_wkt( projinfo, projunits, 0, 0 );
-    Wkt = QString( wkt );
-    G_free( wkt );
-  }
+    G_TRY
+    {
+      G_get_default_window( &cellhd );
+    }
+    G_CATCH( QgsGrass::Exception &e )
+    {
+      Q_UNUSED( e );
+      QgsDebugMsg( QString( "Cannot get default window: %1" ).arg( e.what() ) );
+      return QgsCoordinateReferenceSystem();
+    }
 
-  setlocale( LC_NUMERIC, oldlocale );
+    if ( cellhd.proj != PROJECTION_XY )
+    {
+      struct Key_Value *projinfo = G_get_projinfo();
+      struct Key_Value *projunits = G_get_projunits();
+      char *wkt = GPJ_grass_to_wkt( projinfo, projunits, 0, 0 );
+      Wkt = QString( wkt );
+      G_free( wkt );
+    }
+  }
 
   QgsCoordinateReferenceSystem srs;
   srs.createFromWkt( Wkt );

src/providers/ogr/qgsogrprovider.cpp

@@ -19,6 +19,7 @@ email                : sherman at mrcc.com
 #include "qgsogrfeatureiterator.h"
 #include "qgslogger.h"
 #include "qgsmessagelog.h"
+#include "qgslocalec.h"
 
 #define CPL_SUPRESS_CPLUSPLUS
 #include <gdal.h>         // to collect version information
@@ -45,6 +46,7 @@ email                : sherman at mrcc.com
 #include "qgsgeometry.h"
 #include "qgscoordinatereferencesystem.h"
 #include "qgsvectorlayerimport.h"
+#include "qgslocalec.h"
 
 static const QString TEXT_PROVIDER_KEY = "ogr";
 static const QString TEXT_PROVIDER_DESCRIPTION =
@@ -1001,11 +1003,7 @@ bool QgsOgrProvider::addFeature( QgsFeature& f )
 
   QgsAttributes attrs = f.attributes();
 
-  char *oldlocale = setlocale( LC_NUMERIC, NULL );
-  if ( oldlocale )
-    oldlocale = strdup( oldlocale );
-
-  setlocale( LC_NUMERIC, "C" );
+  QgsLocaleNumC l;
 
   //add possible attribute information
   for ( int targetAttributeId = 0; targetAttributeId < attrs.count(); ++targetAttributeId )
@@ -1084,10 +1082,6 @@ bool QgsOgrProvider::addFeature( QgsFeature& f )
   }
   OGR_F_Destroy( feature );
 
-  setlocale( LC_NUMERIC, oldlocale );
-  if ( oldlocale )
-    free( oldlocale );
-
   return returnValue;
 }
 
@@ -1222,10 +1216,7 @@ bool QgsOgrProvider::changeAttributeValues( const QgsChangedAttributesMap &attr_
       continue;
     }
 
-    char *oldlocale = setlocale( LC_NUMERIC, NULL );
-    if ( oldlocale )
-      oldlocale = strdup( oldlocale );
-    setlocale( LC_NUMERIC, "C" );
+    QgsLocaleNumC l;
 
     for ( QgsAttributeMap::const_iterator it2 = attr.begin(); it2 != attr.end(); ++it2 )
     {
@@ -1287,10 +1278,6 @@ bool QgsOgrProvider::changeAttributeValues( const QgsChangedAttributesMap &attr_
     {
       pushError( tr( "OGR error setting feature %1: %2" ).arg( fid ).arg( CPLGetLastErrorMsg() ) );
     }
-
-    setlocale( LC_NUMERIC, oldlocale );
-    if ( oldlocale )
-      free( oldlocale );
   }
 
   if ( OGR_L_SyncToDisk( ogrLayer ) != OGRERR_NONE )