ircd: sendf() directly to client (prelim).

include/ircd/client.h

@@ -65,6 +65,17 @@ void recv_cancel(client &);
 void recv_next(client &, const std::chrono::milliseconds &timeout);
 void recv_next(client &);
 
+class sendf
+:std::array<char, BUFSIZE>
+,public fmt::snprintf
+{
+	void flush(client &);
+
+  public:
+	template<class... Args>
+	sendf(client &, const char *const &fmt, Args&&... args);
+};
+
 // Destroys a client. This only removes the client from the clients list,
 // and may result in a destruction and disconnect, or it may not.
 void finished(client &);
@@ -76,6 +87,19 @@ std::shared_ptr<client> add_client(std::shared_ptr<struct sock>);
 using clist = std::list<std::shared_ptr<client>>;
 const clist &clients();
 
+
+template<class... Args>
+sendf::sendf(client &client,
+             const char *const &fmt,
+             Args&&... args)
+:fmt::snprintf
+{
+	array::data(), array::size(), fmt, std::forward<Args>(args)...
+}
+{
+	flush(client);
+}
+
 }      // namespace ircd
 #endif // __cplusplus
 

ircd/client.cc

@@ -91,6 +91,24 @@ ircd::add_client()
 	return client;
 }
 
+void
+ircd::sendf::flush(client &client)
+{
+	static const char *const terminator
+	{
+		"\r\n"
+	};
+
+	const std::array<const_buffer, 2> buffers
+	{{
+		{ buffer(), std::min(consumed(), size_t(510))  },  //TODO: framemax
+		{ terminator, 2                                }
+	}};
+
+	auto &sock(socket(client));
+	sock.send(buffers);
+}
+
 bool
 ircd::disconnect(std::nothrow_t,
                  client &client,