From c06f6943a66cff3fa20e570edc8f2aff235ae75e Mon Sep 17 00:00:00 2001
From: Kevin O'Connor <kevin@koconnor.net>
Date: Fri, 27 Sep 2019 18:24:18 -0400
Subject: [PATCH] list: Add additional list helper functions
Add list_is_first, list_is_last, list_last_entry, and list_prev_entry
helper functions.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
---
klippy/chelper/list.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/klippy/chelper/list.h b/klippy/chelper/list.h
index 317a109cf..12fe2b038 100644
--- a/klippy/chelper/list.h
+++ b/klippy/chelper/list.h
@@ -30,6 +30,18 @@ list_empty(const struct list_head *h)
return h->root.next == &h->root;
}
+static inline int
+list_is_first(const struct list_node *n, const struct list_head *h)
+{
+ return n->prev == &h->root;
+}
+
+static inline int
+list_is_last(const struct list_node *n, const struct list_head *h)
+{
+ return n->next == &h->root;
+}
+
static inline void
list_del(struct list_node *n)
{
@@ -90,9 +102,15 @@ list_join_tail(struct list_head *add, struct list_head *h)
#define list_next_entry(pos, member) \
container_of((pos)->member.next, typeof(*pos), member)
+#define list_prev_entry(pos, member) \
+ container_of((pos)->member.prev, typeof(*pos), member)
+
#define list_first_entry(head, type, member) \
container_of((head)->root.next, type, member)
+#define list_last_entry(head, type, member) \
+ container_of((head)->root.prev, type, member)
+
#define list_for_each_entry(pos, head, member) \
for (pos = list_first_entry((head), typeof(*pos), member) \
; &pos->member != &(head)->root \