Lots of work on removing malloc from driver

luprex/core/cpp/driver-util.cpp

@@ -0,0 +1,29 @@
+
+#include "driver-util.hpp"
+#include "luastack.hpp"
+
+namespace drv {
+
+void split_host_port(std::string_view target, UmmString &host, UmmString &port) {
+    size_t lastcolon = target.rfind(':');
+    if (lastcolon == std::string_view::npos) {
+        host = ""; port = ""; return;
+    }
+    host = target.substr(0, lastcolon);
+    port = target.substr(lastcolon + 1);
+    if ((host == "") || (port == "")) {
+        host = ""; port = ""; return;
+    }
+}
+
+} // namespace drv
+
+LuaDefine(unittests_driverutil, "", "some unit tests") {
+    // Test split_host_port
+    UmmString host, port;
+    drv::split_host_port("stanford.edu:80", host, port);
+    LuaAssertStrEq(L, host, "stanford.edu");
+    LuaAssertStrEq(L, port, "80");
+
+    return 0;
+}