fix grass crash:

  setlocale to "C" in getSRS() and catch fatal errors
  (probably needed at much more places).


git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@8476 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: jef

src/plugins/grass/qgsgrassselect.cpp

@@ -397,6 +397,7 @@ QStringList QgsGrassSelect::vectorLayers ( QString gisdbase,
     level = Vect_open_old_head (&map, (char *) mapName.ascii(), 
       (char *) mapset.ascii());
   }
+  QgsGrass::clearErrorEnv();
 
   if ( QgsGrass::getError() == QgsGrass::FATAL ) {
     std::cerr << "Cannot open GRASS vector: " << QgsGrass::getErrorMessage().toLocal8Bit().data() << std::endl;

src/providers/grass/qgsgrass.cpp

@@ -16,6 +16,7 @@
 /* $Id$ */
 
 #include <iostream>
+#include <qgslogger.h>
 
 #include "QString"
 #include "q3process.h"
@@ -375,6 +376,7 @@ QString QgsGrass::mGisrc;
 QString QgsGrass::mTmp;
 
 jmp_buf QgsGrass::mFatalErrorEnv;
+bool QgsGrass::mFatalErrorEnvActive=false;
 
 int QgsGrass::error_routine ( char *msg, int fatal)
 {
@@ -383,15 +385,21 @@ int QgsGrass::error_routine ( char *msg, int fatal)
 
 int QgsGrass::error_routine ( const char *msg, int fatal)
 {
-  std::cerr << "error_routine (fatal = " << fatal << "): " << msg << std::endl;
+  QgsDebugMsg(QString("error_routine (fatal = %1): %2").arg(fatal).arg(msg));
 
   error_message = msg;
 
   if ( fatal )
-  { 
+  {
     error = FATAL;
     // we have to do a long jump here, otherwise GRASS >= 6.3 will kill our process
-    longjmp(mFatalErrorEnv, 1);
+    if( mFatalErrorEnvActive )
+      longjmp(mFatalErrorEnv, 1);
+    else
+    {
+      QMessageBox::warning( 0, QObject::tr("Uncatched fatal GRASS error"), msg );
+      abort();
+    }
   }
   else
     error = WARNING;
@@ -416,9 +424,18 @@ QString GRASS_EXPORT QgsGrass::getErrorMessage ( void )
 
 jmp_buf GRASS_EXPORT &QgsGrass::fatalErrorEnv()
 {
+  if(mFatalErrorEnvActive)
+    QgsDebugMsg("fatal error environment already active.");
+  mFatalErrorEnvActive = true;
   return mFatalErrorEnv;
 }
 
+void GRASS_EXPORT QgsGrass::clearErrorEnv()
+{
+  if(!mFatalErrorEnvActive)
+    QgsDebugMsg("fatal error environment already deactive.");
+  mFatalErrorEnvActive = false;
+}
 
 QString GRASS_EXPORT QgsGrass::openMapset ( QString gisdbase, QString location, QString mapset )
 {

src/providers/grass/qgsgrass.h

@@ -155,6 +155,7 @@ class QgsGrass {
     static GRASS_EXPORT QString versionString();
 
     static GRASS_EXPORT jmp_buf& fatalErrorEnv();
+    static GRASS_EXPORT void clearErrorEnv();
 
 
 private:
@@ -184,6 +185,7 @@ class QgsGrass {
 
     // Context saved before a call to routine that can produce a fatal error
     static jmp_buf mFatalErrorEnv;
+    static bool mFatalErrorEnvActive;
 };
 
 #endif // QGSGRASS_H

src/providers/grass/qgsgrassprovider.cpp

@@ -1250,8 +1250,24 @@ QgsSpatialRefSys QgsGrassProvider::getSRS()
 
   struct Cell_head cellhd;
 
+  QgsGrass::resetError();
   QgsGrass::setLocation ( mGisdbase, mLocation ); 
-  G_get_default_window(&cellhd);
+
+  char *oldlocale = setlocale(LC_ALL, NULL);
+  setlocale(LC_ALL, "C");
+
+  if ( setjmp(QgsGrass::fatalErrorEnv()) == 0 )
+  {
+    G_get_default_window(&cellhd);
+  }
+  QgsGrass::clearErrorEnv();
+
+  if ( QgsGrass::getError() == QgsGrass::FATAL ) {
+    setlocale(LC_ALL, oldlocale);
+    QgsDebugMsg(QString("Cannot get default window: %1").arg(QgsGrass::getErrorMessage()));
+    return QgsSpatialRefSys();
+  }
+
   if (cellhd.proj != PROJECTION_XY) {
     struct Key_Value *projinfo = G_get_projinfo();
     struct Key_Value *projunits = G_get_projunits();
@@ -1260,6 +1276,8 @@ QgsSpatialRefSys QgsGrassProvider::getSRS()
     free ( wkt);
   }
 
+  setlocale(LC_ALL, oldlocale);
+
   QgsSpatialRefSys srs;
   srs.createFromWkt(WKT);