Safer fix for bug #579932 that won't leak memory.

(bzr r9662)

3 files changed, 18 insertions, 17 deletions

diff --git a/src/document-undo.cpp b/src/document-undo.cpp
index 62259fa19..e63fe8a52 100644
--- a/src/document-undo.cpp
+++ b/src/document-undo.cpp
@@ -125,11 +125,10 @@ sp_document_done (SPDocument *doc, const unsigned int event_type, Glib::ustring
         sp_document_maybe_done (doc, NULL, event_type, event_description);
 }
 
-void
-sp_document_reset_key (Inkscape::Application */*inkscape*/, SPDesktop */*desktop*/, GtkObject *base)
+void sp_document_reset_key( Inkscape::Application * /*inkscape*/, SPDesktop * /*desktop*/, GtkObject *base )
 {
-    SPDocument *doc = (SPDocument *) base;
-    doc->actionkey = NULL;
+    SPDocument *doc = reinterpret_cast<SPDocument *>(base);
+    doc->actionkey.clear();
 }
 
 namespace {
@@ -171,6 +170,9 @@ sp_document_maybe_done (SPDocument *doc, const gchar *key, const unsigned int ev
 	g_assert (doc != NULL);
 	g_assert (doc->priv != NULL);
 	g_assert (doc->priv->sensitive);
+        if ( key && !*key ) {
+            g_warning("Blank undo key specified.");
+        }
 
         Inkscape::Debug::EventTracker<CommitEvent> tracker(doc, key, event_type);
 
@@ -188,7 +190,7 @@ sp_document_maybe_done (SPDocument *doc, const gchar *key, const unsigned int ev
 		return;
 	}
 
-	if (key && doc->actionkey && !strcmp (key, doc->actionkey) && doc->priv->undo) {
+	if (key && !doc->actionkey.empty() && (doc->actionkey == key) && doc->priv->undo) {
                 ((Inkscape::Event *)doc->priv->undo->data)->event =
                     sp_repr_coalesce_log (((Inkscape::Event *)doc->priv->undo->data)->event, log);
 	} else {
@@ -198,9 +200,11 @@ sp_document_maybe_done (SPDocument *doc, const gchar *key, const unsigned int ev
 		doc->priv->undoStackObservers.notifyUndoCommitEvent(event);
 	}
 
-        if (doc->actionkey)
-            g_free(doc->actionkey);
-	doc->actionkey = key ? g_strdup(key) : NULL;
+        if ( key ) {
+            doc->actionkey = key;
+        } else {
+            doc->actionkey.clear();
+        }
 
 	doc->virgin = FALSE;
         doc->setModifiedSinceSave();
@@ -259,7 +263,7 @@ sp_document_undo (SPDocument *doc)
 	doc->priv->sensitive = FALSE;
         doc->priv->seeking = true;
 
-	doc->actionkey = NULL;
+	doc->actionkey.clear();
 
 	finish_incomplete_transaction(*doc);
 
@@ -305,7 +309,7 @@ sp_document_redo (SPDocument *doc)
 	doc->priv->sensitive = FALSE;
         doc->priv->seeking = true;
 
-	doc->actionkey = NULL;
+	doc->actionkey.clear();
 
 	finish_incomplete_transaction(*doc);
 
diff --git a/src/document.cpp b/src/document.cpp
index eebc50a98..3c9f7e5ed 100644
--- a/src/document.cpp
+++ b/src/document.cpp
@@ -92,7 +92,7 @@ SPDocument::SPDocument() :
     base(0),
     name(0),
     priv(0), // reset in ctor
-    actionkey(0),
+    actionkey(),
     modified_id(0),
     rerouting_handler_id(0),
     profileManager(0), // deferred until after other initialization
@@ -211,10 +211,6 @@ SPDocument::~SPDocument() {
         inkscape_unref();
         keepalive = FALSE;
     }
-    if (actionkey) {
-        g_free(actionkey);
-        actionkey = NULL;
-    }
     //delete this->_whiteboard_session_manager;
 }
 
@@ -291,7 +287,7 @@ void SPDocument::collectOrphans() {
 
 void SPDocument::reset_key (void */*dummy*/)
 {
-    actionkey = NULL;
+    actionkey.clear();
 }
 
 SPDocument *
diff --git a/src/document.h b/src/document.h
index bcc072f70..5810b5358 100644
--- a/src/document.h
+++ b/src/document.h
@@ -96,7 +96,8 @@ struct SPDocument : public Inkscape::GC::Managed<>,
     SPDocumentPrivate *priv;
 
     /// Last action key
-    gchar *actionkey;
+    Glib::ustring actionkey;
+
     /// Handler ID
     guint modified_id;