From b073d4b0c2c1d4dce36adcc285ad5dfaf2f7599d Mon Sep 17 00:00:00 2001
From: Louis Burda <quent.burda@gmail.com>
Date: Thu, 27 Jan 2022 03:29:44 +0100
Subject: New list interface for fast tail access

---
 src/list.h | 35 +++++++++++++++++++++++------------
 1 file changed, 23 insertions(+), 12 deletions(-)

(limited to 'src/list.h')

diff --git a/src/list.h b/src/list.h
index b0e174d..a18068a 100644
--- a/src/list.h
+++ b/src/list.h
@@ -7,29 +7,40 @@
 	const typeof( ((type *)0)->link ) *__mptr = (ptr); \
 	(type *)( (char *)__mptr - LINK_OFFSET(type) ); })
 
-#define LIST_HEAD ((struct link) { .prev = NULL, .next = NULL })
 #define LINK_EMPTY ((struct link) { 0 })
 
 #define LINK(p) (&(p)->link)
 
+#define LIST_INNER(list, link) \
+	(((link) != &(list)->head) && ((link) != &(list)->tail))
+
+#define LIST_ITER(list, iter) (iter) = (list)->head.next; \
+	(iter) != &(list)->tail; (iter) = (iter)->next
+
+typedef void (*link_free_func)(void *p);
+
 struct link {
 	struct link *prev;
 	struct link *next;
 };
 
-/* list_XXX functions operate on the list head */
+struct list {
+	struct link head;
+	struct link tail;
+};
 
-void list_free(struct link *head, void (*free_item)(void *), int offset);
-int list_empty(struct link *head);
-int list_len(struct link *head);
-int list_ffind(struct link *head, struct link *link);
-struct link *list_at(struct link *head, int n);
-void list_push_front(struct link *head, struct link *link);
-void list_push_back(struct link *head, struct link *link);
-struct link *list_pop_front(struct link *head);
+void list_init(struct list *list);
+void list_free(struct list *list, void (*free_item)(void *), int offset);
+int list_empty(struct list *list);
+int list_len(struct list *list);
+struct link *list_at(struct list *list, int n);
+void list_push_front(struct list *list, struct link *link);
+void list_push_back(struct list *list, struct link *link);
+struct link *list_pop_front(struct list *list);
+struct link *list_pop_back(struct list *list);
 
 void link_prepend(struct link *list, struct link *link);
 void link_append(struct link *list, struct link *link);
-struct link *link_back(struct link *list);
-struct link *link_pop(struct link *link);
 struct link *link_iter(struct link *link, int n);
+struct link *link_pop(struct link *link);
+
-- 
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