add: parsing

src/setting.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "host.h"
+
+#include <stddef.h>
+#include <stdbool.h>
+
+struct setting
+{
+    bool help;
+    bool verbose;
+    bool flood;
+    bool numeric_only;
+    size_t timeout;
+    size_t ttl;
+    struct hostenv dest;
+};