X-Git-Url: http://git.archive.openwrt.org/?p=project%2Flibubox.git;a=blobdiff_plain;f=avl.h;h=46a396f2d6d55191d9e3117f563726c0d4ac8a23;hp=80a29b75ca5f22ed2cb820f16cde996846e79bc2;hb=a1a97eb11e89c420b84a659a88a4e72c7f04367d;hpb=63cea8dcb79be7bf2bd32b7c05ac289a473192a5

diff --git a/avl.h b/avl.h
index 80a29b7..46a396f 100644
--- a/avl.h
+++ b/avl.h
@@ -82,7 +82,7 @@ struct avl_node {
   /**
    * pointer to key of node
    */
-  void *key;
+  const void *key;
 
   /**
    * balance state of AVL tree (0,-1,+1)
@@ -160,8 +160,6 @@ struct avl_node *EXPORT(avl_find_greaterequal)(const struct avl_tree *tree, cons
 struct avl_node *EXPORT(avl_find_lessequal)(const struct avl_tree *tree, const void *key);
 int EXPORT(avl_insert)(struct avl_tree *, struct avl_node *);
 void EXPORT(avl_delete)(struct avl_tree *, struct avl_node *);
-void *EXPORT(__avl_find_element)(const struct avl_tree *tree, const void *key,
-    size_t offset, enum avl_find_mode mode);
 
 /**
  * @param tree pointer to avl-tree
@@ -193,6 +191,32 @@ avl_is_empty(struct avl_tree *tree) {
 }
 
 /**
+ * Internal function to support returning the element from a avl tree query
+ * @param tree pointer to avl tree
+ * @param key pointer to key
+ * @param offset offset of node inside the embedded struct
+ * @param mode mode of lookup operation (less equal, equal or greater equal)
+ * @param pointer to elemen, NULL if no fitting one was found
+ */
+static inline void *
+__avl_find_element(const struct avl_tree *tree, const void *key, size_t offset, enum avl_find_mode mode) {
+  void *node = NULL;
+
+  switch (mode) {
+    case AVL_FIND_EQUAL:
+      node = avl_find(tree, key);
+      break;
+    case AVL_FIND_LESSEQUAL:
+      node = avl_find_lessequal(tree, key);
+      break;
+    case AVL_FIND_GREATEREQUAL:
+      node = avl_find_greaterequal(tree, key);
+      break;
+  }
+  return node == NULL ? NULL : (((char *)node) - offset);
+}
+
+/**
  * @param tree pointer to avl-tree
  * @param key pointer to key
  * @param element pointer to a node element