+ replace_history_data (-1, (histdata_t *)orig_list, (histdata_t *)NULL);
+}
+
+UNDO_LIST *
+_rl_copy_undo_entry (entry)
+ UNDO_LIST *entry;
+{
+ UNDO_LIST *new;
+
+ new = alloc_undo_entry (entry->what, entry->start, entry->end, (char *)NULL);
+ new->text = entry->text ? savestring (entry->text) : 0;
+ return new;
+}
+
+UNDO_LIST *
+_rl_copy_undo_list (head)
+ UNDO_LIST *head;
+{
+ UNDO_LIST *list, *new, *roving, *c;
+
+ if (head == 0)
+ return head;
+
+ list = head;
+ new = 0;
+ while (list)
+ {
+ c = _rl_copy_undo_entry (list);
+ if (new == 0)
+ roving = new = c;
+ else
+ {
+ roving->next = c;
+ roving = roving->next;
+ }
+ list = list->next;
+ }
+
+ roving->next = 0;
+ return new;