begin tree implementation

git-svn-id: https://svn.musicpd.org/mpd/trunk@2984 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/tree.c

@@ -0,0 +1,52 @@
+#include "tree.h"
+
+static inline TreeNode * newTreeNode() {
+	TreeNode * ret = malloc(sizeof(TreeNode));
+
+	ret->data[0] = NULL;
+	ret->data[1] = NULL;
+
+	ret->children[0] = NULL;
+	ret->children[1] = NULL;
+	ret->children[2] = NULL;
+
+	return ret;
+}
+
+static inline void freeTreeNode(TreeNode * node) {
+	free(node);
+}
+
+Tree * newTree(TreeFreeDataFunc * freeFunc, TreeCompareDataFunc * compareFunc) {
+	Tree * ret = malloc(sizeof(Tree));
+
+	ret->headNode = NULL;
+	ret->freeFunc = freeFunc;
+	ret->compareFunc = compareFunc;
+
+	return ret;
+}
+
+void freeTree(Tree * tree) {
+	TreeIterator * iter = newTreeIterator(tree, POSTORDER);
+
+	TreeNode * node;
+
+	if(data->freeFunc) {
+		void * data;
+
+		while( ( data = nextTreeIterator(iter) ) ) {
+
+		}
+	
+		freeTreeIterator(iter);
+
+		iter = newTreeIterator(tree, POSTORDER);
+	}
+
+	while( ( node = nextNodeTreeIterator(iter) ) ) {
+		freeTreeNode(node);
+	}
+
+	freeTreeIterator(iter);
+}