NULL pointer checks

(bzr r12271)

1 files changed, 48 insertions, 33 deletions

diff --git a/src/extension/implementation/script.cpp b/src/extension/implementation/script.cpp
index 3ac1e06ab..69ce982d0 100644
--- a/src/extension/implementation/script.cpp
+++ b/src/extension/implementation/script.cpp
@@ -669,8 +669,13 @@ void Script::effect(Inkscape::Extension::Effect *module,
         printf("TOO BAD TO LIVE!!!");
         exit(1);
     }
+    if (doc == NULL)
+    {
+        g_warning("Script::effect: View not defined");
+        return;
+    }
 
-    SPDesktop *desktop = (SPDesktop *)doc;
+    SPDesktop *desktop = reinterpret_cast<SPDesktop *>(doc);
     sp_namedview_document_from_window(desktop);
 
     std::list<std::string> params;
@@ -696,16 +701,14 @@ void Script::effect(Inkscape::Extension::Effect *module,
         return;
     }
 
-    if (desktop != NULL) {
-        Inkscape::Util::GSListConstIterator<SPItem *> selected =
-             sp_desktop_selection(desktop)->itemList();
-        while ( selected != NULL ) {
-            Glib::ustring selected_id;
-            selected_id += "--id=";
-            selected_id += (*selected)->getId();
-            params.insert(params.begin(), selected_id);
-            ++selected;
-        }
+    Inkscape::Util::GSListConstIterator<SPItem *> selected =
+        sp_desktop_selection(desktop)->itemList(); //desktop should not be NULL since doc was checked and desktop is a casted pointer
+    while ( selected != NULL ) {
+        Glib::ustring selected_id;
+        selected_id += "--id=";
+        selected_id += (*selected)->getId();
+        params.insert(params.begin(), selected_id);
+        ++selected;
     }
 
     file_listener fileout;
@@ -728,30 +731,37 @@ void Script::effect(Inkscape::Extension::Effect *module,
 
     g_unlink(tempfilename_out.c_str());
 
-    /* Do something with mydoc.... */
     if (mydoc) {
-        doc->doc()->emitReconstructionStart();
-        copy_doc(doc->doc()->rroot, mydoc->rroot);
-        doc->doc()->emitReconstructionFinish();
-        SPObject *layer = NULL;
-        
-        // Getting the named view from the document generated by the extension
-        SPNamedView *nv = sp_document_namedview(mydoc, NULL);
-        
-        //Check if it has a default layer set up
-        if ( nv != NULL){
-            if( nv->default_layer_id != 0 ) {
-                SPDocument *document = desktop->doc();
-                //If so, get that layer
-                layer = document->getObjectById(g_quark_to_string(nv->default_layer_id));
+        SPDocument* vd=doc->doc();
+        if (vd != NULL)
+        {
+            vd->emitReconstructionStart();
+            copy_doc(vd->rroot, mydoc->rroot);
+            vd->emitReconstructionFinish();
+            SPObject *layer = NULL;
+            
+            // Getting the named view from the document generated by the extension
+            SPNamedView *nv = sp_document_namedview(mydoc, NULL);
+            
+            //Check if it has a default layer set up
+            if ( nv != NULL)
+            {
+                if( nv->default_layer_id != 0 ) {
+                    SPDocument *document = desktop->doc();
+                    //If so, get that layer
+                    if (document != NULL)
+                    {
+                        layer = document->getObjectById(g_quark_to_string(nv->default_layer_id));
+                    }
+                }
+            }
+            
+            sp_namedview_update_layers_from_document(desktop);
+            //If that layer exists,
+            if (layer) {
+                //set the current layer
+                desktop->setCurrentLayer(layer);
             }
-        }
-
-        sp_namedview_update_layers_from_document(desktop);
-        //If that layer exists,
-        if (layer) {
-            //set the current layer
-            desktop->setCurrentLayer(layer);
         }
         mydoc->release();
     }
@@ -778,6 +788,11 @@ void Script::effect(Inkscape::Extension::Effect *module,
 */
 void Script::copy_doc (Inkscape::XML::Node * oldroot, Inkscape::XML::Node * newroot)
 {
+    if ((oldroot == NULL) ||(newroot == NULL))
+    {
+        g_warning("Error on copy_doc: NULL pointer input.");
+        return;
+    }
     std::vector<Inkscape::XML::Node *> delete_list;
     Inkscape::XML::Node * oldroot_namedview = NULL;