neue Funktion: tree_copy()

1 files changed, 24 insertions, 0 deletions

diff --git a/tree.c b/tree.c
index f6ccc5a..fb38c89 100644
--- a/tree.c
+++ b/tree.c
@@ -245,6 +245,30 @@ tree_count(struct tree_node *tree)
 }
 /* -->8-- */
 
+/* --8<-- tree_copy */
+struct tree_node *
+tree_copy(struct tree_node *tree)
+{
+        if ( tree ) {
+                struct tree_node *new_node;
+
+                new_node = malloc(sizeof *new_node);
+                if ( new_node != NULL ) {
+                        new_node->key   = tree->key;
+                        new_node->count = tree->count;
+                        new_node->left  = tree_copy(tree->left);
+                        new_node->right = tree_copy(tree->right);
+                }
+                else {
+                        ERROR("out of memory");
+                }
+
+                return new_node;
+        }
+        return NULL;
+}
+/* -->8-- */
+
 /* --8<-- tree_isleaf */
 bool
 tree_isleaf(struct tree_node *tree)