- * Insert an element into a DLL after the given other
- * element. Insert at the head if the other
- * element is NULL.
- */
-#define GNUNET_CONTAINER_DLL_insert_after(head,tail,other,element) \
+ * Insert an element at the tail of a DLL. Assumes that head, tail and
+ * element are structs with prev and next fields.
+ *
+ * @param head pointer to the head of the DLL
+ * @param tail pointer to the tail of the DLL
+ * @param element element to insert
+ */
+#define GNUNET_CONTAINER_DLL_insert_tail(head,tail,element) do { \
+ GNUNET_assert ( ( (element)->prev == NULL) && ((head) != (element))); \
+ GNUNET_assert ( ( (element)->next == NULL) && ((tail) != (element))); \
+ (element)->prev = (tail); \
+ (element)->next = NULL; \
+ if ((head) == NULL) \
+ (head) = element; \
+ else \
+ (tail)->next = element; \
+ (tail) = (element); } while (0)
+
+
+/**
+ * Insert an element into a DLL after the given other element. Insert
+ * at the head if the other element is NULL.
+ *
+ * @param head pointer to the head of the DLL
+ * @param tail pointer to the tail of the DLL
+ * @param other prior element, NULL for insertion at head of DLL
+ * @param element element to insert
+ */
+#define GNUNET_CONTAINER_DLL_insert_after(head,tail,other,element) do { \
+ GNUNET_assert ( ( (element)->prev == NULL) && ((head) != (element))); \
+ GNUNET_assert ( ( (element)->next == NULL) && ((tail) != (element))); \