From 13ec81ce3e2f77504818de0bf89a2a1edd7e0ba2 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 2 Oct 2011 19:40:03 +0200
Subject: [PATCH] vlist: store a pointer to the real key to make lookups easier

---
 interface-ip.c | 16 ++++++----------
 utils.c        |  4 ++--
 utils.h        |  6 +++---
 3 files changed, 11 insertions(+), 15 deletions(-)

diff --git a/interface-ip.c b/interface-ip.c
index 0845169..2d7a2d0 100644
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -13,19 +13,15 @@
 static int
 addr_cmp(const void *k1, const void *k2, void *ptr)
 {
-	const struct device_addr *a1 = k1, *a2 = k2;
-
-	return memcmp(&a1->mask, &a2->mask,
-		sizeof(*a1) - offsetof(struct device_addr, mask));
+	return memcmp(k1, k2, sizeof(struct device_addr) -
+		      offsetof(struct device_addr, mask));
 }
 
 static int
 route_cmp(const void *k1, const void *k2, void *ptr)
 {
-	const struct device_route *r1 = k1, *r2 = k2;
-
-	return memcmp(&r1->mask, &r2->mask,
-		sizeof(*r1) - offsetof(struct device_route, mask));
+	return memcmp(k1, k2, sizeof(struct device_route) -
+		      offsetof(struct device_route, mask));
 }
 
 static void
@@ -84,7 +80,7 @@ void
 interface_ip_init(struct interface *iface)
 {
 	vlist_init(&iface->proto_route, route_cmp, interface_update_proto_route,
-		   struct device_route, node);
+		   struct device_route, node, mask);
 	vlist_init(&iface->proto_addr, addr_cmp, interface_update_proto_addr,
-		   struct device_addr, node);
+		   struct device_addr, node, mask);
 }
diff --git a/utils.c b/utils.c
index a67a8c9..cc22290 100644
--- a/utils.c
+++ b/utils.c
@@ -11,7 +11,7 @@ void
 __vlist_init(struct vlist_tree *tree, avl_tree_comp cmp,
 	     vlist_update_cb update, int offset)
 {
-	tree->node_offset = offset;
+	tree->key_offset = offset;
 	tree->update = update;
 	tree->version = 1;
 
@@ -30,7 +30,7 @@ vlist_add(struct vlist_tree *tree, struct vlist_node *node)
 {
 	struct vlist_node *old_node = NULL;
 	struct avl_node *anode;
-	void *key = (char *) node - tree->node_offset;
+	void *key = (char *) node + tree->key_offset;
 
 	node->avl.key = key;
 	node->version = tree->version;
diff --git a/utils.h b/utils.h
index ab73930..31fcd1f 100644
--- a/utils.h
+++ b/utils.h
@@ -27,7 +27,7 @@ struct vlist_tree {
 	struct avl_tree avl;
 
 	vlist_update_cb update;
-	int node_offset;
+	int key_offset;
 	bool keep_old;
 
 	int version;
@@ -40,8 +40,8 @@ struct vlist_node {
 
 void __vlist_init(struct vlist_tree *tree, avl_tree_comp cmp, vlist_update_cb update, int offset);
 
-#define vlist_init(tree, cmp, update, type, node) \
-	__vlist_init(tree, cmp, update, offsetof(type, node))
+#define vlist_init(tree, cmp, update, type, node, key) \
+	__vlist_init(tree, cmp, update, offsetof(type, key) - offsetof(type, node))
 
 void vlist_add(struct vlist_tree *tree, struct vlist_node *node);
 void vlist_delete(struct vlist_tree *tree, struct vlist_node *node);
-- 
2.11.0