1 files changed, 22 insertions, 0 deletions
diff --git a/src/search/twalk.c b/src/search/twalk.c
new file mode 100644
index 00000000..53821cda
--- /dev/null
+++ b/src/search/twalk.c
@@ -0,0 +1,22 @@
+#include <search.h>
+#include "tsearch.h"
+
+static void walk(const struct node *r, void (*action)(const void *, VISIT, int), int d)
+{
+	if (!r)
+		return;
+	if (r->h == 1)
+		action(r, leaf, d);
+	else {
+		action(r, preorder, d);
+		walk(r->a[0], action, d+1);
+		action(r, postorder, d);
+		walk(r->a[1], action, d+1);
+		action(r, endorder, d);
+	}
+}
+
+void twalk(const void *root, void (*action)(const void *, VISIT, int))
+{
+	walk(root, action, 0);
+}