* printf(" -> %s\n", c->name);
* }
*/
-struct list_head *list_check(struct list_head *h, const char *abortstr);
+struct list_head *list_check(const struct list_head *h, const char *abortstr);
#ifdef CCAN_LIST_DEBUG
#define debug_list(h) list_check((h), __func__)
* Example:
* assert(list_empty(&parent->children) == (parent->num_children == 0));
*/
-static inline bool list_empty(struct list_head *h)
+static inline bool list_empty(const struct list_head *h)
{
(void)debug_list(h);
return h->n.next == &h->n;
* first = list_top(&parent->children, struct child, list);
*/
#define list_top(h, type, member) \
- list_entry(_list_top(h), type, member)
+ (list_empty(h) ? NULL : list_entry((h)->n.next, type, member))
-static inline struct list_node *_list_top(struct list_head *h)
-{
- (void)debug_list(h);
- if (list_empty(h))
- return NULL;
- return h->n.next;
-}
+/**
+ * list_tail - get the last entry in a list
+ * @h: the list_head
+ * @type: the type of the entry
+ * @member: the list_node member of the type
+ *
+ * If the list is empty, returns NULL.
+ *
+ * Example:
+ * struct child *last;
+ * last = list_tail(&parent->children, struct child, list);
+ */
+#define list_tail(h, type, member) \
+ (list_empty(h) ? NULL : list_entry((h)->n.prev, type, member))
/**
* list_for_each - iterate through a list.