1 files changed, 16 insertions, 2 deletions
diff --git a/source/blender/blenlib/intern/listbase.c b/source/blender/blenlib/intern/listbase.c
index 1064c8ac1bf..b3a4722d6d9 100644
--- a/source/blender/blenlib/intern/listbase.c
+++ b/source/blender/blenlib/intern/listbase.c
@@ -347,11 +347,11 @@ void BLI_duplicatelist(ListBase *list1, ListBase *list2)  /* copy from 2 to 1 */
 {
 	struct Link *link1, *link2;
 	
+	/* in this order, to ensure it works if list1 == list2 */
+	link2= list2->first;
 	list1->first= list1->last= 0;
 	
-	link2= list2->first;
 	while(link2) {
-		
 		link1= MEM_dupallocN(link2);
 		BLI_addtail(list1, link1);
 		
@@ -359,3 +359,17 @@ void BLI_duplicatelist(ListBase *list1, ListBase *list2)  /* copy from 2 to 1 */
 	}	
 }
 
+/* create a generic list node containing link to provided data */
+LinkData *BLI_genericNodeN (void *data)
+{
+	LinkData *ld;
+	
+	if (data == NULL)
+		return NULL;
+		
+	/* create new link, and make it hold the given data */
+	ld= MEM_callocN(sizeof(LinkData), "BLI_genericNodeN()");
+	ld->data= data;
+	
+	return ld;
+}