Convert WriteNumeric() calls to pass the parameters of the numeric as method parameters

120 files changed, 431 insertions, 407 deletions

diff --git a/include/isupportmanager.h b/include/isupportmanager.h
index 1f41de5d2..3a0df78f9 100644
--- a/include/isupportmanager.h
+++ b/include/isupportmanager.h
@@ -24,7 +24,7 @@ class CoreExport ISupportManager
 {
  private:
 	/** The generated lines which are sent to clients. */
-	std::vector<std::string> cachedlines;
+	std::vector<Numeric::Numeric> cachedlines;
 
  public:
 	/** (Re)build the ISUPPORT vector.
@@ -34,9 +34,9 @@ class CoreExport ISupportManager
 	void Build();
 
 	/** Returns the cached std::vector of ISUPPORT lines.
-	 * @return A list of strings prepared for sending to users
+	 * @return A list of Numeric::Numeric objects prepared for sending to users
 	 */
-	const std::vector<std::string>& GetLines() const { return cachedlines; }
+	const std::vector<Numeric::Numeric>& GetLines() const { return cachedlines; }
 
 	/** Send the 005 numerics (ISUPPORT) to a user.
 	 * @param user The user to send the ISUPPORT numerics to
diff --git a/include/modules.h b/include/modules.h
index 526c283b2..86ee7f4f3 100644
--- a/include/modules.h
+++ b/include/modules.h
@@ -987,7 +987,7 @@ class CoreExport Module : public classbase, public usecountbase
 	 */
 	virtual ModResult OnNamesListItem(User* issuer, Membership* item, std::string& prefixes, std::string& nick);
 
-	virtual ModResult OnNumeric(User* user, unsigned int numeric, const std::string &text);
+	virtual ModResult OnNumeric(User* user, const Numeric::Numeric& numeric);
 
 	/** Called whenever a result from /WHO is about to be returned
 	 * @param source The user running the /WHO query
diff --git a/include/numericbuilder.h b/include/numericbuilder.h
index 371f275a9..726aeff3f 100644
--- a/include/numericbuilder.h
+++ b/include/numericbuilder.h
@@ -40,9 +40,9 @@ class Numeric::WriteNumericSink
 	{
 	}
 
-	void operator()(unsigned int numeric, const std::string& params) const
+	void operator()(Numeric& numeric) const
 	{
-		user->WriteNumeric(numeric, params);
+		user->WriteNumeric(numeric);
 	}
 };
 
@@ -50,14 +50,12 @@ template <char Sep, bool SendEmpty, typename Sink>
 class Numeric::GenericBuilder
 {
 	Sink sink;
-	std::string data;
-	const unsigned int numeric;
+	Numeric numeric;
 	const std::string::size_type max;
-	std::string::size_type beginpos;
 
 	bool HasRoom(const std::string::size_type additional) const
 	{
-		return (data.size() + additional <= max);
+		return (numeric.GetParams().back().size() + additional <= max);
 	}
 
  public:
@@ -67,28 +65,28 @@ class Numeric::GenericBuilder
 		, max(ServerInstance->Config->Limits.MaxLine - ServerInstance->Config->ServerName.size() - additionalsize - 9)
 	{
 		if (addparam)
-			data.push_back(':');
-		SaveBeginPos();
+			numeric.push(std::string());
 	}
 
-	std::string& GetNumeric() { return data; }
+	Numeric& GetNumeric() { return numeric; }
 
 	void Add(const std::string& entry)
 	{
 		if (!HasRoom(entry.size()))
 			Flush();
-		data.append(entry).push_back(Sep);
+		numeric.GetParams().back().append(entry).push_back(Sep);
 	}
 
 	void Add(const std::string& entry1, const std::string& entry2)
 	{
 		if (!HasRoom(entry1.size() + entry2.size()))
 			Flush();
-		data.append(entry1).append(entry2).push_back(Sep);
+		numeric.GetParams().back().append(entry1).append(entry2).push_back(Sep);
 	}
 
 	void Flush()
 	{
+		std::string& data = numeric.GetParams().back();
 		if (IsEmpty())
 		{
 			if (!SendEmpty)
@@ -99,13 +97,11 @@ class Numeric::GenericBuilder
 			data.erase(data.size()-1);
 		}
 
-		sink(numeric, data);
-		if (data.size() > beginpos)
-			data.erase(beginpos);
+		sink(numeric);
+		data.clear();
 	}
 
-	bool IsEmpty() const { return (data.size() == beginpos); }
-	void SaveBeginPos() { beginpos = data.size(); }
+	bool IsEmpty() const { return (numeric.GetParams().back().empty()); }
 };
 
 template <char Sep, bool SendEmpty>
diff --git a/include/users.h b/include/users.h
index fa346a329..8aa88798c 100644
--- a/include/users.h
+++ b/include/users.h
@@ -519,9 +519,58 @@ class CoreExport User : public Extensible
 	 */
 	void WriteNotice(const std::string& text) { this->WriteCommand("NOTICE", ":" + text); }
 
-	void WriteNumeric(unsigned int numeric, const char* text, ...) CUSTOM_PRINTF(3, 4);
 
-	void WriteNumeric(unsigned int numeric, const std::string &text);
+	void WriteNumeric(const Numeric::Numeric& numeric);
+
+	template <typename T1>
+	void WriteNumeric(unsigned int numeric, T1 p1)
+	{
+		Numeric::Numeric n(numeric);
+		n.push(p1);
+		WriteNumeric(n);
+	}
+
+	template <typename T1, typename T2>
+	void WriteNumeric(unsigned int numeric, T1 p1, T2 p2)
+	{
+		Numeric::Numeric n(numeric);
+		n.push(p1);
+		n.push(p2);
+		WriteNumeric(n);
+	}
+
+	template <typename T1, typename T2, typename T3>
+	void WriteNumeric(unsigned int numeric, T1 p1, T2 p2, T3 p3)
+	{
+		Numeric::Numeric n(numeric);
+		n.push(p1);
+		n.push(p2);
+		n.push(p3);
+		WriteNumeric(n);
+	}
+
+	template <typename T1, typename T2, typename T3, typename T4>
+	void WriteNumeric(unsigned int numeric, T1 p1, T2 p2, T3 p3, T4 p4)
+	{
+		Numeric::Numeric n(numeric);
+		n.push(p1);
+		n.push(p2);
+		n.push(p3);
+		n.push(p4);
+		WriteNumeric(n);
+	}
+
+	template <typename T1, typename T2, typename T3, typename T4, typename T5>
+	void WriteNumeric(unsigned int numeric, T1 p1, T2 p2, T3 p3, T4 p4, T5 p5)
+	{
+		Numeric::Numeric n(numeric);
+		n.push(p1);
+		n.push(p2);
+		n.push(p3);
+		n.push(p4);
+		n.push(p5);
+		WriteNumeric(n);
+	}
 
 	/** Write text to this user, appending CR/LF and prepending :nick!user\@host of the user provided in the first parameter.
 	 * @param user The user to prepend the :nick!user\@host of
diff --git a/src/channels.cpp b/src/channels.cpp
index 99da00708..a2d5c4a30 100644
--- a/src/channels.cpp
+++ b/src/channels.cpp
@@ -180,7 +180,7 @@ Channel* Channel::JoinUser(LocalUser* user, std::string cname, bool override, co
 		}
 		if (user->chans.size() >= maxchans)
 		{
-			user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s :You are on too many channels", cname.c_str());
+			user->WriteNumeric(ERR_TOOMANYCHANNELS, cname, "You are on too many channels");
 			return NULL;
 		}
 	}
@@ -240,7 +240,7 @@ Channel* Channel::JoinUser(LocalUser* user, std::string cname, bool override, co
 					if (!MOD_RESULT.check(InspIRCd::TimingSafeCompare(ckey, key)))
 					{
 						// If no key provided, or key is not the right one, and can't bypass +k (not invited or option not enabled)
-						user->WriteNumeric(ERR_BADCHANNELKEY, "%s :Cannot join channel (Incorrect channel key)", chan->name.c_str());
+						user->WriteNumeric(ERR_BADCHANNELKEY, chan->name, "Cannot join channel (Incorrect channel key)");
 						return NULL;
 					}
 				}
@@ -250,7 +250,7 @@ Channel* Channel::JoinUser(LocalUser* user, std::string cname, bool override, co
 					FIRST_MOD_RESULT(OnCheckInvite, MOD_RESULT, (user, chan));
 					if (MOD_RESULT != MOD_RES_ALLOW)
 					{
-						user->WriteNumeric(ERR_INVITEONLYCHAN, "%s :Cannot join channel (Invite only)", chan->name.c_str());
+						user->WriteNumeric(ERR_INVITEONLYCHAN, chan->name, "Cannot join channel (Invite only)");
 						return NULL;
 					}
 				}
@@ -261,14 +261,14 @@ Channel* Channel::JoinUser(LocalUser* user, std::string cname, bool override, co
 					FIRST_MOD_RESULT(OnCheckLimit, MOD_RESULT, (user, chan));
 					if (!MOD_RESULT.check((chan->GetUserCounter() < atol(limit.c_str()))))
 					{
-						user->WriteNumeric(ERR_CHANNELISFULL, "%s :Cannot join channel (Channel is full)", chan->name.c_str());
+						user->WriteNumeric(ERR_CHANNELISFULL, chan->name, "Cannot join channel (Channel is full)");
 						return NULL;
 					}
 				}
 
 				if (chan->IsBanned(user))
 				{
-					user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s :Cannot join channel (You're banned)", chan->name.c_str());
+					user->WriteNumeric(ERR_BANNEDFROMCHAN, chan->name, "Cannot join channel (You're banned)");
 					return NULL;
 				}
 			}
diff --git a/src/command_parse.cpp b/src/command_parse.cpp
index c123353b0..514394a57 100644
--- a/src/command_parse.cpp
+++ b/src/command_parse.cpp
@@ -217,7 +217,7 @@ void CommandParser::ProcessCommand(LocalUser *user, std::string &cmd)
 		if (!handler)
 		{
 			if (user->registered == REG_ALL)
-				user->WriteNumeric(ERR_UNKNOWNCOMMAND, "%s :Unknown command",command.c_str());
+				user->WriteNumeric(ERR_UNKNOWNCOMMAND, command, "Unknown command");
 			ServerInstance->stats.Unknown++;
 			return;
 		}
@@ -268,15 +268,15 @@ void CommandParser::ProcessCommand(LocalUser *user, std::string &cmd)
 		if (!user->IsModeSet(handler->flags_needed))
 		{
 			user->CommandFloodPenalty += failpenalty;
-			user->WriteNumeric(ERR_NOPRIVILEGES, ":Permission Denied - You do not have the required operator privileges");
+			user->WriteNumeric(ERR_NOPRIVILEGES, "Permission Denied - You do not have the required operator privileges");
 			return;
 		}
 
 		if (!user->HasPermission(command))
 		{
 			user->CommandFloodPenalty += failpenalty;
-			user->WriteNumeric(ERR_NOPRIVILEGES, ":Permission Denied - Oper type %s does not have access to command %s",
-				user->oper->name.c_str(), command.c_str());
+			user->WriteNumeric(ERR_NOPRIVILEGES, InspIRCd::Format("Permission Denied - Oper type %s does not have access to command %s",
+				user->oper->name.c_str(), command.c_str()));
 			return;
 		}
 	}
@@ -287,11 +287,11 @@ void CommandParser::ProcessCommand(LocalUser *user, std::string &cmd)
 		user->CommandFloodPenalty += failpenalty;
 		if (ServerInstance->Config->DisabledDontExist)
 		{
-			user->WriteNumeric(ERR_UNKNOWNCOMMAND, "%s :Unknown command", command.c_str());
+			user->WriteNumeric(ERR_UNKNOWNCOMMAND, command, "Unknown command");
 		}
 		else
 		{
-			user->WriteNumeric(ERR_UNKNOWNCOMMAND, "%s :This command has been disabled.", command.c_str());
+			user->WriteNumeric(ERR_UNKNOWNCOMMAND, command, "This command has been disabled.");
 		}
 
 		ServerInstance->SNO->WriteToSnoMask('a', "%s denied for %s (%s@%s)",
@@ -305,16 +305,16 @@ void CommandParser::ProcessCommand(LocalUser *user, std::string &cmd)
 	if (command_p.size() < handler->min_params)
 	{
 		user->CommandFloodPenalty += failpenalty;
-		user->WriteNumeric(ERR_NEEDMOREPARAMS, "%s :Not enough parameters.", command.c_str());
+		user->WriteNumeric(ERR_NEEDMOREPARAMS, command, "Not enough parameters.");
 		if ((ServerInstance->Config->SyntaxHints) && (user->registered == REG_ALL) && (handler->syntax.length()))
-			user->WriteNumeric(RPL_SYNTAX, ":SYNTAX %s %s", handler->name.c_str(), handler->syntax.c_str());
+			user->WriteNumeric(RPL_SYNTAX, InspIRCd::Format("SYNTAX %s %s", handler->name.c_str(), handler->syntax.c_str()));
 		return;
 	}
 
 	if ((user->registered != REG_ALL) && (!handler->WorksBeforeReg()))
 	{
 		user->CommandFloodPenalty += failpenalty;
-		user->WriteNumeric(ERR_NOTREGISTERED, "%s :You have not registered",command.c_str());
+		user->WriteNumeric(ERR_NOTREGISTERED, command, "You have not registered");
 	}
 	else
 	{
diff --git a/src/configreader.cpp b/src/configreader.cpp
index 2c31fa0ae..cec4be3d3 100644
--- a/src/configreader.cpp
+++ b/src/configreader.cpp
@@ -688,14 +688,14 @@ void ServerConfig::ApplyModules(User* user)
 			ServerInstance->SNO->WriteGlobalSno('a', "*** REHASH UNLOADED MODULE: %s", modname.c_str());
 
 			if (user)
-				user->WriteNumeric(RPL_UNLOADEDMODULE, "%s :Module %s successfully unloaded.", modname.c_str(), modname.c_str());
+				user->WriteNumeric(RPL_UNLOADEDMODULE, modname, InspIRCd::Format("Module %s successfully unloaded.", modname.c_str()));
 			else
 				ServerInstance->SNO->WriteGlobalSno('a', "Module %s successfully unloaded.", modname.c_str());
 		}
 		else
 		{
 			if (user)
-				user->WriteNumeric(ERR_CANTUNLOADMODULE, "%s :Failed to unload module %s: %s", modname.c_str(), modname.c_str(), ServerInstance->Modules->LastError().c_str());
+				user->WriteNumeric(ERR_CANTUNLOADMODULE, modname, InspIRCd::Format("Failed to unload module %s: %s", modname.c_str(), ServerInstance->Modules->LastError().c_str()));
 			else
 				ServerInstance->SNO->WriteGlobalSno('a', "Failed to unload module %s: %s", modname.c_str(), ServerInstance->Modules->LastError().c_str());
 		}
@@ -707,14 +707,14 @@ void ServerConfig::ApplyModules(User* user)
 		{
 			ServerInstance->SNO->WriteGlobalSno('a', "*** REHASH LOADED MODULE: %s",adding->c_str());
 			if (user)
-				user->WriteNumeric(RPL_LOADEDMODULE, "%s :Module %s successfully loaded.", adding->c_str(), adding->c_str());
+				user->WriteNumeric(RPL_LOADEDMODULE, *adding, InspIRCd::Format("Module %s successfully loaded.", adding->c_str()));
 			else
 				ServerInstance->SNO->WriteGlobalSno('a', "Module %s successfully loaded.", adding->c_str());
 		}
 		else
 		{
 			if (user)
-				user->WriteNumeric(ERR_CANTLOADMODULE, "%s :Failed to load module %s: %s", adding->c_str(), adding->c_str(), ServerInstance->Modules->LastError().c_str());
+				user->WriteNumeric(ERR_CANTLOADMODULE, *adding, InspIRCd::Format("Failed to load module %s: %s", adding->c_str(), ServerInstance->Modules->LastError().c_str()));
 			else
 				ServerInstance->SNO->WriteGlobalSno('a', "Failed to load module %s: %s", adding->c_str(), ServerInstance->Modules->LastError().c_str());
 		}
diff --git a/src/coremods/core_channel/cmd_invite.cpp b/src/coremods/core_channel/cmd_invite.cpp
index c1f1b00c7..a1319ebc0 100644
--- a/src/coremods/core_channel/cmd_invite.cpp
+++ b/src/coremods/core_channel/cmd_invite.cpp
@@ -58,7 +58,7 @@ CmdResult CommandInvite::Handle (const std::vector<std::string>& parameters, Use
 
 		if ((!c) || (!u) || (u->registered != REG_ALL))
 		{
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", c ? parameters[0].c_str() : parameters[1].c_str());
+			user->WriteNumeric(Numerics::NoSuchNick(c ? parameters[0] : parameters[1]));
 			return CMD_FAILURE;
 		}
 
@@ -77,13 +77,13 @@ CmdResult CommandInvite::Handle (const std::vector<std::string>& parameters, Use
 
 		if ((IS_LOCAL(user)) && (!c->HasUser(user)))
 		{
-			user->WriteNumeric(ERR_NOTONCHANNEL, "%s :You're not on that channel!", c->name.c_str());
+			user->WriteNumeric(ERR_NOTONCHANNEL, c->name, "You're not on that channel!");
 			return CMD_FAILURE;
 		}
 
 		if (c->HasUser(u))
 		{
-			user->WriteNumeric(ERR_USERONCHANNEL, "%s %s :is already on channel", u->nick.c_str(), c->name.c_str());
+			user->WriteNumeric(ERR_USERONCHANNEL, u->nick, c->name, "is already on channel");
 			return CMD_FAILURE;
 		}
 
@@ -102,8 +102,8 @@ CmdResult CommandInvite::Handle (const std::vector<std::string>& parameters, Use
 				{
 					// Check whether halfop mode is available and phrase error message accordingly
 					ModeHandler* mh = ServerInstance->Modes->FindMode('h', MODETYPE_CHANNEL);
-					user->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You must be a channel %soperator",
-						c->name.c_str(), (mh && mh->name == "halfop" ? "half-" : ""));
+					user->WriteNumeric(ERR_CHANOPRIVSNEEDED, c->name, InspIRCd::Format("You must be a channel %soperator",
+						(mh && mh->name == "halfop" ? "half-" : "")));
 					return CMD_FAILURE;
 				}
 			}
@@ -117,9 +117,9 @@ CmdResult CommandInvite::Handle (const std::vector<std::string>& parameters, Use
 
 		if (IS_LOCAL(user))
 		{
-			user->WriteNumeric(RPL_INVITING, "%s %s", u->nick.c_str(),c->name.c_str());
+			user->WriteNumeric(RPL_INVITING, u->nick, c->name);
 			if (u->IsAway())
-				user->WriteNumeric(RPL_AWAY, "%s :%s", u->nick.c_str(), u->awaymsg.c_str());
+				user->WriteNumeric(RPL_AWAY, u->nick, u->awaymsg);
 		}
 
 		char prefix = 0;
@@ -161,9 +161,9 @@ CmdResult CommandInvite::Handle (const std::vector<std::string>& parameters, Use
 		if (list)
 		{
 			for (Invite::List::const_iterator i = list->begin(); i != list->end(); ++i)
-				user->WriteNumeric(RPL_INVITELIST, ":%s", (*i)->chan->name.c_str());
+				user->WriteNumeric(RPL_INVITELIST, (*i)->chan->name);
 		}
-		user->WriteNumeric(RPL_ENDOFINVITELIST, ":End of INVITE list");
+		user->WriteNumeric(RPL_ENDOFINVITELIST, "End of INVITE list");
 	}
 	return CMD_SUCCESS;
 }
diff --git a/src/coremods/core_channel/cmd_join.cpp b/src/coremods/core_channel/cmd_join.cpp
index 1945bf52e..06e203ead 100644
--- a/src/coremods/core_channel/cmd_join.cpp
+++ b/src/coremods/core_channel/cmd_join.cpp
@@ -55,6 +55,6 @@ CmdResult CommandJoin::HandleLocal(const std::vector<std::string>& parameters, L
 		}
 	}
 
-	user->WriteNumeric(ERR_NOSUCHCHANNEL, "%s :Invalid channel name", parameters[0].c_str());
+	user->WriteNumeric(ERR_NOSUCHCHANNEL, parameters[0], "Invalid channel name");
 	return CMD_FAILURE;
 }
diff --git a/src/coremods/core_channel/cmd_kick.cpp b/src/coremods/core_channel/cmd_kick.cpp
index 44f511bc1..7f8a8a329 100644
--- a/src/coremods/core_channel/cmd_kick.cpp
+++ b/src/coremods/core_channel/cmd_kick.cpp
@@ -44,7 +44,7 @@ CmdResult CommandKick::Handle (const std::vector<std::string>& parameters, User
 
 	if ((!u) || (!c) || (u->registered != REG_ALL))
 	{
-		user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", c ? parameters[1].c_str() : parameters[0].c_str());
+		user->WriteNumeric(Numerics::NoSuchNick(c ? parameters[1] : parameters[0]));
 		return CMD_FAILURE;
 	}
 
@@ -54,13 +54,13 @@ CmdResult CommandKick::Handle (const std::vector<std::string>& parameters, User
 		srcmemb = c->GetUser(user);
 		if (!srcmemb)
 		{
-			user->WriteNumeric(ERR_NOTONCHANNEL, "%s :You're not on that channel!", parameters[0].c_str());
+			user->WriteNumeric(ERR_NOTONCHANNEL, parameters[0], "You're not on that channel!");
 			return CMD_FAILURE;
 		}
 
 		if (u->server->IsULine())
 		{
-			user->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You may not kick a u-lined client", c->name.c_str());
+			user->WriteNumeric(ERR_CHANOPRIVSNEEDED, c->name, "You may not kick a u-lined client");
 			return CMD_FAILURE;
 		}
 	}
@@ -68,7 +68,7 @@ CmdResult CommandKick::Handle (const std::vector<std::string>& parameters, User
 	const Channel::MemberMap::iterator victimiter = c->userlist.find(u);
 	if (victimiter == c->userlist.end())
 	{
-		user->WriteNumeric(ERR_USERNOTINCHANNEL, "%s %s :They are not on that channel", u->nick.c_str(), c->name.c_str());
+		user->WriteNumeric(ERR_USERNOTINCHANNEL, u->nick, c->name, "They are not on that channel");
 		return CMD_FAILURE;
 	}
 	Membership* const memb = victimiter->second;
@@ -110,8 +110,8 @@ CmdResult CommandKick::Handle (const std::vector<std::string>& parameters, User
 
 			if (them < req)
 			{
-				user->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You must be a channel %soperator",
-					c->name.c_str(), req > HALFOP_VALUE ? "" : "half-");
+				user->WriteNumeric(ERR_CHANOPRIVSNEEDED, c->name, InspIRCd::Format("You must be a channel %soperator",
+					req > HALFOP_VALUE ? "" : "half-"));
 				return CMD_FAILURE;
 			}
 		}
diff --git a/src/coremods/core_channel/cmd_names.cpp b/src/coremods/core_channel/cmd_names.cpp
index 986dbe018..53934b5e3 100644
--- a/src/coremods/core_channel/cmd_names.cpp
+++ b/src/coremods/core_channel/cmd_names.cpp
@@ -38,7 +38,7 @@ CmdResult CommandNames::HandleLocal(const std::vector<std::string>& parameters,
 
 	if (!parameters.size())
 	{
-		user->WriteNumeric(RPL_ENDOFNAMES, "* :End of /NAMES list.");
+		user->WriteNumeric(RPL_ENDOFNAMES, '*', "End of /NAMES list.");
 		return CMD_SUCCESS;
 	}
 
@@ -62,24 +62,23 @@ CmdResult CommandNames::HandleLocal(const std::vector<std::string>& parameters,
 		}
 	}
 
-	user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+	user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 	return CMD_FAILURE;
 }
 
 void CommandNames::SendNames(LocalUser* user, Channel* chan, bool show_invisible)
 {
-	Numeric::Builder<' '> reply(user, RPL_NAMREPLY, false);
-	std::string& list = reply.GetNumeric();
+	Numeric::Builder<' '> reply(user, RPL_NAMREPLY, false, chan->name.size() + 4);
+	Numeric::Numeric& numeric = reply.GetNumeric();
 	if (chan->IsModeSet(secretmode))
-		list.push_back('@');
+		numeric.push(std::string(1, '@'));
 	else if (chan->IsModeSet(privatemode))
-		list.push_back('*');
+		numeric.push(std::string(1, '*'));
 	else
-		list.push_back('=');
+		numeric.push(std::string(1, '='));
 
-	list.push_back(' ');
-	list.append(chan->name).append(" :");
-	reply.SaveBeginPos();
+	numeric.push(chan->name);
+	numeric.push(std::string());
 
 	std::string prefixlist;
 	std::string nick;
@@ -111,5 +110,5 @@ void CommandNames::SendNames(LocalUser* user, Channel* chan, bool show_invisible
 	}
 
 	reply.Flush();
-	user->WriteNumeric(RPL_ENDOFNAMES, "%s :End of /NAMES list.", chan->name.c_str());
+	user->WriteNumeric(RPL_ENDOFNAMES, chan->name, "End of /NAMES list.");
 }
diff --git a/src/coremods/core_channel/cmd_topic.cpp b/src/coremods/core_channel/cmd_topic.cpp
index 8d65d764a..b42148939 100644
--- a/src/coremods/core_channel/cmd_topic.cpp
+++ b/src/coremods/core_channel/cmd_topic.cpp
@@ -37,7 +37,7 @@ CmdResult CommandTopic::HandleLocal(const std::vector<std::string>& parameters,
 	Channel* c = ServerInstance->FindChan(parameters[0]);
 	if (!c)
 	{
-		user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+		user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 		return CMD_FAILURE;
 	}
 
@@ -45,7 +45,7 @@ CmdResult CommandTopic::HandleLocal(const std::vector<std::string>& parameters,
 	{
 		if ((c->IsModeSet(secretmode)) && (!c->HasUser(user)))
 		{
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", c->name.c_str());
+			user->WriteNumeric(Numerics::NoSuchNick(c->name));
 			return CMD_FAILURE;
 		}
 
@@ -55,7 +55,7 @@ CmdResult CommandTopic::HandleLocal(const std::vector<std::string>& parameters,
 		}
 		else
 		{
-			user->WriteNumeric(RPL_NOTOPICSET, "%s :No topic is set.", c->name.c_str());
+			user->WriteNumeric(RPL_NOTOPICSET, c->name, "No topic is set.");
 		}
 		return CMD_SUCCESS;
 	}
@@ -70,12 +70,12 @@ CmdResult CommandTopic::HandleLocal(const std::vector<std::string>& parameters,
 	{
 		if (!c->HasUser(user))
 		{
-			user->WriteNumeric(ERR_NOTONCHANNEL, "%s :You're not on that channel!", c->name.c_str());
+			user->WriteNumeric(ERR_NOTONCHANNEL, c->name, "You're not on that channel!");
 			return CMD_FAILURE;
 		}
 		if (c->IsModeSet(topiclockmode) && !ServerInstance->OnCheckExemption(user, c, "topiclock").check(c->GetPrefixValue(user) >= HALFOP_VALUE))
 		{
-			user->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You do not have access to change the topic on this channel", c->name.c_str());
+			user->WriteNumeric(ERR_CHANOPRIVSNEEDED, c->name, "You do not have access to change the topic on this channel");
 			return CMD_FAILURE;
 		}
 	}
@@ -86,6 +86,6 @@ CmdResult CommandTopic::HandleLocal(const std::vector<std::string>& parameters,
 
 void Topic::ShowTopic(LocalUser* user, Channel* chan)
 {
-	user->WriteNumeric(RPL_TOPIC, "%s :%s", chan->name.c_str(), chan->topic.c_str());
-	user->WriteNumeric(RPL_TOPICTIME, "%s %s %lu", chan->name.c_str(), chan->setby.c_str(), (unsigned long)chan->topicset);
+	user->WriteNumeric(RPL_TOPIC, chan->name, chan->topic);
+	user->WriteNumeric(RPL_TOPICTIME, chan->name, chan->setby, (unsigned long)chan->topicset);
 }
diff --git a/src/coremods/core_info/cmd_commands.cpp b/src/coremods/core_info/cmd_commands.cpp
index 3ff6728d8..e15d178f5 100644
--- a/src/coremods/core_info/cmd_commands.cpp
+++ b/src/coremods/core_info/cmd_commands.cpp
@@ -48,6 +48,6 @@ CmdResult CommandCommands::Handle (const std::vector<std::string>&, User *user)
 	std::sort(list.begin(), list.end());
 	for(unsigned int i=0; i < list.size(); i++)
 		user->Write(list[i]);
-	user->WriteNumeric(RPL_COMMANDSEND, ":End of COMMANDS list");
+	user->WriteNumeric(RPL_COMMANDSEND, "End of COMMANDS list");
 	return CMD_SUCCESS;
 }
diff --git a/src/coremods/core_info/cmd_version.cpp b/src/coremods/core_info/cmd_version.cpp
index eb3ab2c4e..9ec0108b1 100644
--- a/src/coremods/core_info/cmd_version.cpp
+++ b/src/coremods/core_info/cmd_version.cpp
@@ -30,7 +30,7 @@ CommandVersion::CommandVersion(Module* parent)
 CmdResult CommandVersion::Handle (const std::vector<std::string>&, User *user)
 {
 	std::string version = ServerInstance->GetVersionString((user->IsOper()));
-	user->WriteNumeric(RPL_VERSION, ":%s", version.c_str());
+	user->WriteNumeric(RPL_VERSION, version);
 	LocalUser *lu = IS_LOCAL(user);
 	if (lu != NULL)
 	{
diff --git a/src/coremods/core_list.cpp b/src/coremods/core_list.cpp
index 278e6044d..67829a55e 100644
--- a/src/coremods/core_list.cpp
+++ b/src/coremods/core_list.cpp
@@ -53,7 +53,7 @@ CmdResult CommandList::Handle (const std::vector<std::string>& parameters, User
 {
 	int minusers = 0, maxusers = 0;
 
-	user->WriteNumeric(RPL_LISTSTART, "Channel :Users Name");
+	user->WriteNumeric(RPL_LISTSTART, "Channel", "Users Name");
 
 	/* Work around mIRC suckyness. YOU SUCK, KHALED! */
 	if (parameters.size() == 1)
@@ -100,16 +100,16 @@ CmdResult CommandList::Handle (const std::vector<std::string>& parameters, User
 			if ((!n) && (chan->IsModeSet(privatemode)))
 			{
 				// Channel is private (+p) and user is outside/not privileged
-				user->WriteNumeric(RPL_LIST, "* %ld :", users);
+				user->WriteNumeric(RPL_LIST, '*', users, "");
 			}
 			else
 			{
 				/* User is in the channel/privileged, channel is not +s */
-				user->WriteNumeric(RPL_LIST, "%s %ld :[+%s] %s", chan->name.c_str(), users, chan->ChanModes(n), chan->topic.c_str());
+				user->WriteNumeric(RPL_LIST, chan->name, users, InspIRCd::Format("[+%s] %s", chan->ChanModes(n), chan->topic.c_str()));
 			}
 		}
 	}
-	user->WriteNumeric(RPL_LISTEND, ":End of channel list.");
+	user->WriteNumeric(RPL_LISTEND, "End of channel list.");
 
 	return CMD_SUCCESS;
 }
diff --git a/src/coremods/core_loadmodule.cpp b/src/coremods/core_loadmodule.cpp
index 1d49d89d0..09c044198 100644
--- a/src/coremods/core_loadmodule.cpp
+++ b/src/coremods/core_loadmodule.cpp
@@ -43,12 +43,12 @@ CmdResult CommandLoadmodule::Handle (const std::vector<std::string>& parameters,
 	if (ServerInstance->Modules->Load(parameters[0]))
 	{
 		ServerInstance->SNO->WriteGlobalSno('a', "NEW MODULE: %s loaded %s",user->nick.c_str(), parameters[0].c_str());
-		user->WriteNumeric(RPL_LOADEDMODULE, "%s :Module successfully loaded.", parameters[0].c_str());
+		user->WriteNumeric(RPL_LOADEDMODULE, parameters[0], "Module successfully loaded.");
 		return CMD_SUCCESS;
 	}
 	else
 	{
-		user->WriteNumeric(ERR_CANTLOADMODULE, "%s :%s", parameters[0].c_str(), ServerInstance->Modules->LastError().c_str());
+		user->WriteNumeric(ERR_CANTLOADMODULE, parameters[0], ServerInstance->Modules->LastError());
 		return CMD_FAILURE;
 	}
 }
@@ -80,26 +80,25 @@ CmdResult CommandUnloadmodule::Handle(const std::vector<std::string>& parameters
 	if (!ServerInstance->Config->ConfValue("security")->getBool("allowcoreunload") &&
 		InspIRCd::Match(parameters[0], "core_*.so", ascii_case_insensitive_map))
 	{
-		user->WriteNumeric(ERR_CANTUNLOADMODULE, "%s :You cannot unload core commands!", parameters[0].c_str());
+		user->WriteNumeric(ERR_CANTUNLOADMODULE, parameters[0], "You cannot unload core commands!");
 		return CMD_FAILURE;
 	}
 
 	Module* m = ServerInstance->Modules->Find(parameters[0]);
 	if (m == creator)
 	{
-		user->WriteNumeric(ERR_CANTUNLOADMODULE, "%s :You cannot unload module loading commands!", parameters[0].c_str());
+		user->WriteNumeric(ERR_CANTUNLOADMODULE, parameters[0], "You cannot unload module loading commands!");
 		return CMD_FAILURE;
 	}
 
 	if (m && ServerInstance->Modules->Unload(m))
 	{
 		ServerInstance->SNO->WriteGlobalSno('a', "MODULE UNLOADED: %s unloaded %s", user->nick.c_str(), parameters[0].c_str());
-		user->WriteNumeric(RPL_UNLOADEDMODULE, "%s :Module successfully unloaded.", parameters[0].c_str());
+		user->WriteNumeric(RPL_UNLOADEDMODULE, parameters[0], "Module successfully unloaded.");
 	}
 	else
 	{
-		user->WriteNumeric(ERR_CANTUNLOADMODULE, "%s :%s", parameters[0].c_str(),
-			m ? ServerInstance->Modules->LastError().c_str() : "No such module");
+		user->WriteNumeric(ERR_CANTUNLOADMODULE, parameters[0], (m ? ServerInstance->Modules->LastError() : "No such module"));
 		return CMD_FAILURE;
 	}
 
diff --git a/src/coremods/core_lusers.cpp b/src/coremods/core_lusers.cpp
index 2529ca42b..a0d0d0205 100644
--- a/src/coremods/core_lusers.cpp
+++ b/src/coremods/core_lusers.cpp
@@ -84,19 +84,19 @@ CmdResult CommandLusers::Handle (const std::vector<std::string>&, User *user)
 
 	counters.UpdateMaxUsers();
 
-	user->WriteNumeric(RPL_LUSERCLIENT, ":There are %d users and %d invisible on %d servers",
-			n_users - counters.invisible, counters.invisible, n_serv);
+	user->WriteNumeric(RPL_LUSERCLIENT, InspIRCd::Format("There are %d users and %d invisible on %d servers",
+			n_users - counters.invisible, counters.invisible, n_serv));
 
 	if (ServerInstance->Users->OperCount())
-		user->WriteNumeric(RPL_LUSEROP, "%d :operator(s) online", ServerInstance->Users->OperCount());
+		user->WriteNumeric(RPL_LUSEROP, ServerInstance->Users.OperCount(), "operator(s) online");
 
 	if (ServerInstance->Users->UnregisteredUserCount())
-		user->WriteNumeric(RPL_LUSERUNKNOWN, "%d :unknown connections", ServerInstance->Users->UnregisteredUserCount());
+		user->WriteNumeric(RPL_LUSERUNKNOWN, ServerInstance->Users.UnregisteredUserCount(), "unknown connections");
 
-	user->WriteNumeric(RPL_LUSERCHANNELS, "%lu :channels formed", (unsigned long)ServerInstance->GetChans().size());
-	user->WriteNumeric(RPL_LUSERME, ":I have %d clients and %d servers", ServerInstance->Users->LocalUserCount(),n_local_servs);
-	user->WriteNumeric(RPL_LOCALUSERS, ":Current local users: %d  Max: %d", ServerInstance->Users->LocalUserCount(), counters.max_local);
-	user->WriteNumeric(RPL_GLOBALUSERS, ":Current global users: %d  Max: %d", n_users, counters.max_global);
+	user->WriteNumeric(RPL_LUSERCHANNELS, ServerInstance->GetChans().size(), "channels formed");
+	user->WriteNumeric(RPL_LUSERME, InspIRCd::Format("I have %d clients and %d servers", ServerInstance->Users.LocalUserCount(), n_local_servs));
+	user->WriteNumeric(RPL_LOCALUSERS, InspIRCd::Format("Current local users: %d  Max: %d", ServerInstance->Users.LocalUserCount(), counters.max_local));
+	user->WriteNumeric(RPL_GLOBALUSERS, InspIRCd::Format("Current global users: %d  Max: %d", n_users, counters.max_global));
 
 	return CMD_SUCCESS;
 }
diff --git a/src/coremods/core_oper/cmd_kill.cpp b/src/coremods/core_oper/cmd_kill.cpp
index 4a0cb2f28..0d111ce02 100644
--- a/src/coremods/core_oper/cmd_kill.cpp
+++ b/src/coremods/core_oper/cmd_kill.cpp
@@ -129,7 +129,7 @@ CmdResult CommandKill::Handle (const std::vector<std::string>& parameters, User
 	}
 	else
 	{
-		user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+		user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 		return CMD_FAILURE;
 	}
 
diff --git a/src/coremods/core_oper/cmd_oper.cpp b/src/coremods/core_oper/cmd_oper.cpp
index e4ba69549..9c06583a8 100644
--- a/src/coremods/core_oper/cmd_oper.cpp
+++ b/src/coremods/core_oper/cmd_oper.cpp
@@ -63,7 +63,7 @@ CmdResult CommandOper::HandleLocal(const std::vector<std::string>& parameters, L
 		fields.append("hosts");
 
 	// tell them they suck, and lag them up to help prevent brute-force attacks
-	user->WriteNumeric(ERR_NOOPERHOST, ":Invalid oper credentials");
+	user->WriteNumeric(ERR_NOOPERHOST, "Invalid oper credentials");
 	user->CommandFloodPenalty += 10000;
 
 	ServerInstance->SNO->WriteGlobalSno('o', "WARNING! Failed oper attempt by %s using login '%s': The following fields do not match: %s", user->GetFullRealHost().c_str(), parameters[0].c_str(), fields.c_str());
diff --git a/src/coremods/core_oper/cmd_rehash.cpp b/src/coremods/core_oper/cmd_rehash.cpp
index 19d2fa8c2..5ce38eb2c 100644
--- a/src/coremods/core_oper/cmd_rehash.cpp
+++ b/src/coremods/core_oper/cmd_rehash.cpp
@@ -68,7 +68,7 @@ CmdResult CommandRehash::Handle (const std::vector<std::string>& parameters, Use
 		ServerInstance->SNO->WriteGlobalSno('a', m);
 
 		if (IS_LOCAL(user))
-			user->WriteNumeric(RPL_REHASHING, "%s :Rehashing", FileSystem::GetFileName(ServerInstance->ConfigFileName).c_str());
+			user->WriteNumeric(RPL_REHASHING, FileSystem::GetFileName(ServerInstance->ConfigFileName), "Rehashing");
 		else
 			ServerInstance->PI->SendUserNotice(user, "*** Rehashing server " + FileSystem::GetFileName(ServerInstance->ConfigFileName));
 
diff --git a/src/coremods/core_privmsg.cpp b/src/coremods/core_privmsg.cpp
index d691464c0..cccba0850 100644
--- a/src/coremods/core_privmsg.cpp
+++ b/src/coremods/core_privmsg.cpp
@@ -130,13 +130,13 @@ CmdResult MessageCommandBase::HandleMessage(const std::vector<std::string>& para
 			{
 				if (chan->IsModeSet(noextmsgmode) && !chan->HasUser(user))
 				{
-					user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :Cannot send to channel (no external messages)", chan->name.c_str());
+					user->WriteNumeric(ERR_CANNOTSENDTOCHAN, chan->name, "Cannot send to channel (no external messages)");
 					return CMD_FAILURE;
 				}
 
 				if (chan->IsModeSet(moderatedmode))
 				{
-					user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :Cannot send to channel (+m)", chan->name.c_str());
+					user->WriteNumeric(ERR_CANNOTSENDTOCHAN, chan->name, "Cannot send to channel (+m)");
 					return CMD_FAILURE;
 				}
 
@@ -144,7 +144,7 @@ CmdResult MessageCommandBase::HandleMessage(const std::vector<std::string>& para
 				{
 					if (chan->IsBanned(user))
 					{
-						user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :Cannot send to channel (you're banned)", chan->name.c_str());
+						user->WriteNumeric(ERR_CANNOTSENDTOCHAN, chan->name, "Cannot send to channel (you're banned)");
 						return CMD_FAILURE;
 					}
 				}
@@ -161,7 +161,7 @@ CmdResult MessageCommandBase::HandleMessage(const std::vector<std::string>& para
 			/* Check again, a module may have zapped the input string */
 			if (temp.empty())
 			{
-				user->WriteNumeric(ERR_NOTEXTTOSEND, ":No text to send");
+				user->WriteNumeric(ERR_NOTEXTTOSEND, "No text to send");
 				return CMD_FAILURE;
 			}
 
@@ -181,7 +181,7 @@ CmdResult MessageCommandBase::HandleMessage(const std::vector<std::string>& para
 		else
 		{
 			/* no such nick/channel */
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", target);
+			user->WriteNumeric(Numerics::NoSuchNick(target));
 			return CMD_FAILURE;
 		}
 		return CMD_SUCCESS;
@@ -202,7 +202,7 @@ CmdResult MessageCommandBase::HandleMessage(const std::vector<std::string>& para
 			if (dest && strcasecmp(dest->server->GetName().c_str(), targetserver + 1))
 			{
 				/* Incorrect server for user */
-				user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+				user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 				return CMD_FAILURE;
 			}
 		}
@@ -216,14 +216,14 @@ CmdResult MessageCommandBase::HandleMessage(const std::vector<std::string>& para
 	{
 		if (parameters[1].empty())
 		{
-			user->WriteNumeric(ERR_NOTEXTTOSEND, ":No text to send");
+			user->WriteNumeric(ERR_NOTEXTTOSEND, "No text to send");
 			return CMD_FAILURE;
 		}
 
 		if ((dest->IsAway()) && (mt == MSG_PRIVMSG))
 		{
 			/* auto respond with aweh msg */
-			user->WriteNumeric(RPL_AWAY, "%s :%s", dest->nick.c_str(), dest->awaymsg.c_str());
+			user->WriteNumeric(RPL_AWAY, dest->nick, dest->awaymsg);
 		}
 
 		ModResult MOD_RESULT;
@@ -248,7 +248,7 @@ CmdResult MessageCommandBase::HandleMessage(const std::vector<std::string>& para
 	else
 	{
 		/* no such nick/channel */
-		user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+		user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 		return CMD_FAILURE;
 	}
 	return CMD_SUCCESS;
diff --git a/src/coremods/core_reloadmodule.cpp b/src/coremods/core_reloadmodule.cpp
index 0d01d9e85..6fcec8ac2 100644
--- a/src/coremods/core_reloadmodule.cpp
+++ b/src/coremods/core_reloadmodule.cpp
@@ -601,7 +601,7 @@ class ReloadAction : public HandlerBase0<void>
 		ServerInstance->SNO->WriteGlobalSno('a', "RELOAD MODULE: %s %ssuccessfully reloaded", passedname.c_str(), result ? "" : "un");
 		User* user = ServerInstance->FindUUID(uuid);
 		if (user)
-			user->WriteNumeric(RPL_LOADEDMODULE, "%s :Module %ssuccessfully reloaded.", passedname.c_str(), result ? "" : "un");
+			user->WriteNumeric(RPL_LOADEDMODULE, passedname, InspIRCd::Format("Module %ssuccessfully reloaded.", (result ? "" : "un")));
 
 		ServerInstance->GlobalCulls.AddItem(this);
 	}
@@ -612,8 +612,7 @@ CmdResult CommandReloadmodule::Handle (const std::vector<std::string>& parameter
 	Module* m = ServerInstance->Modules->Find(parameters[0]);
 	if (m == creator)
 	{
-		user->WriteNumeric(RPL_LOADEDMODULE, "%s :You cannot reload core_reloadmodule.so (unload and load it)",
-			parameters[0].c_str());
+		user->WriteNumeric(RPL_LOADEDMODULE, parameters[0], "You cannot reload core_reloadmodule.so (unload and load it)");
 		return CMD_FAILURE;
 	}
 
@@ -627,7 +626,7 @@ CmdResult CommandReloadmodule::Handle (const std::vector<std::string>& parameter
 	}
 	else
 	{
-		user->WriteNumeric(RPL_LOADEDMODULE, "%s :Could not find module by that name", parameters[0].c_str());
+		user->WriteNumeric(RPL_LOADEDMODULE, parameters[0], "Could not find module by that name");
 		return CMD_FAILURE;
 	}
 }
diff --git a/src/coremods/core_stub.cpp b/src/coremods/core_stub.cpp
index 20f6888b5..91fc16241 100644
--- a/src/coremods/core_stub.cpp
+++ b/src/coremods/core_stub.cpp
@@ -70,8 +70,8 @@ class CommandLinks : public Command
 	 */
 	CmdResult Handle(const std::vector<std::string>& parameters, User* user)
 	{
-		user->WriteNumeric(RPL_LINKS, "%s %s :0 %s", ServerInstance->Config->ServerName.c_str(),ServerInstance->Config->ServerName.c_str(),ServerInstance->Config->ServerDesc.c_str());
-		user->WriteNumeric(RPL_ENDOFLINKS, "* :End of /LINKS list.");
+		user->WriteNumeric(RPL_LINKS, ServerInstance->Config->ServerName, ServerInstance->Config->ServerName, InspIRCd::Format("0 %s", ServerInstance->Config->ServerDesc.c_str()));
+		user->WriteNumeric(RPL_ENDOFLINKS, '*', "End of /LINKS list.");
 		return CMD_SUCCESS;
 	}
 };
@@ -98,11 +98,11 @@ class CommandServer : public Command
 	{
 		if (user->registered == REG_ALL)
 		{
-			user->WriteNumeric(ERR_ALREADYREGISTERED, ":You are already registered. (Perhaps your IRC client does not have a /SERVER command).");
+			user->WriteNumeric(ERR_ALREADYREGISTERED, "You are already registered. (Perhaps your IRC client does not have a /SERVER command).");
 		}
 		else
 		{
-			user->WriteNumeric(ERR_NOTREGISTERED, "SERVER :You may not register as a server (servers have separate ports from clients, change your config)");
+			user->WriteNumeric(ERR_NOTREGISTERED, "SERVER", "You may not register as a server (servers have separate ports from clients, change your config)");
 		}
 		return CMD_FAILURE;
 	}
diff --git a/src/coremods/core_user/cmd_away.cpp b/src/coremods/core_user/cmd_away.cpp
index adc6e6c18..fb720a5a7 100644
--- a/src/coremods/core_user/cmd_away.cpp
+++ b/src/coremods/core_user/cmd_away.cpp
@@ -43,7 +43,7 @@ CmdResult CommandAway::Handle (const std::vector<std::string>& parameters, User
 		user->awaytime = ServerInstance->Time();
 		user->awaymsg.assign(parameters[0], 0, ServerInstance->Config->Limits.MaxAway);
 
-		user->WriteNumeric(RPL_NOWAWAY, ":You have been marked as being away");
+		user->WriteNumeric(RPL_NOWAWAY, "You have been marked as being away");
 	}
 	else
 	{
@@ -53,7 +53,7 @@ CmdResult CommandAway::Handle (const std::vector<std::string>& parameters, User
 			return CMD_FAILURE;
 
 		user->awaymsg.clear();
-		user->WriteNumeric(RPL_UNAWAY, ":You are no longer marked as being away");
+		user->WriteNumeric(RPL_UNAWAY, "You are no longer marked as being away");
 	}
 
 	return CMD_SUCCESS;
diff --git a/src/coremods/core_user/cmd_mode.cpp b/src/coremods/core_user/cmd_mode.cpp
index a62bf51ca..b1790bb89 100644
--- a/src/coremods/core_user/cmd_mode.cpp
+++ b/src/coremods/core_user/cmd_mode.cpp
@@ -45,7 +45,7 @@ CmdResult CommandMode::Handle(const std::vector<std::string>& parameters, User*
 
 	if ((!targetchannel) && (!targetuser))
 	{
-		user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", target.c_str());
+		user->WriteNumeric(Numerics::NoSuchNick(target));
 		return CMD_FAILURE;
 	}
 	if (parameters.size() == 1)
@@ -70,7 +70,7 @@ CmdResult CommandMode::Handle(const std::vector<std::string>& parameters, User*
 			if ((targetuser) && (user != targetuser))
 			{
 				// Local users may only change the modes of other users if a module explicitly allows it
-				user->WriteNumeric(ERR_USERSDONTMATCH, ":Can't change mode for other users");
+				user->WriteNumeric(ERR_USERSDONTMATCH, "Can't change mode for other users");
 				return CMD_FAILURE;
 			}
 
@@ -135,8 +135,8 @@ void CommandMode::DisplayCurrentModes(User* user, User* targetuser, Channel* tar
 	if (targetchannel)
 	{
 		// Display channel's current mode string
-		user->WriteNumeric(RPL_CHANNELMODEIS, "%s +%s", targetchannel->name.c_str(), targetchannel->ChanModes(targetchannel->HasUser(user)));
-		user->WriteNumeric(RPL_CHANNELCREATED, "%s %lu", targetchannel->name.c_str(), (unsigned long)targetchannel->age);
+		user->WriteNumeric(RPL_CHANNELMODEIS, targetchannel->name, (std::string("+") + targetchannel->ChanModes(targetchannel->HasUser(user))));
+		user->WriteNumeric(RPL_CHANNELCREATED, targetchannel->name, (unsigned long)targetchannel->age);
 	}
 	else
 	{
@@ -157,7 +157,7 @@ void CommandMode::DisplayCurrentModes(User* user, User* targetuser, Channel* tar
 		}
 		else
 		{
-			user->WriteNumeric(ERR_USERSDONTMATCH, ":Can't view modes for other users");
+			user->WriteNumeric(ERR_USERSDONTMATCH, "Can't view modes for other users");
 		}
 	}
 }
diff --git a/src/coremods/core_user/cmd_nick.cpp b/src/coremods/core_user/cmd_nick.cpp
index a62e1c207..45e7adae5 100644
--- a/src/coremods/core_user/cmd_nick.cpp
+++ b/src/coremods/core_user/cmd_nick.cpp
@@ -47,7 +47,7 @@ CmdResult CommandNick::HandleLocal(const std::vector<std::string>& parameters, L
 
 	if (newnick.empty())
 	{
-		user->WriteNumeric(ERR_ERRONEUSNICKNAME, "* :Erroneous Nickname");
+		user->WriteNumeric(ERR_ERRONEUSNICKNAME, '*', "Erroneous Nickname");
 		return CMD_FAILURE;
 	}
 
@@ -57,7 +57,7 @@ CmdResult CommandNick::HandleLocal(const std::vector<std::string>& parameters, L
 	}
 	else if (!ServerInstance->IsNick(newnick))
 	{
-		user->WriteNumeric(ERR_ERRONEUSNICKNAME, "%s :Erroneous Nickname", newnick.c_str());
+		user->WriteNumeric(ERR_ERRONEUSNICKNAME, newnick, "Erroneous Nickname");
 		return CMD_FAILURE;
 	}
 
@@ -77,7 +77,7 @@ CmdResult CommandNick::HandleLocal(const std::vector<std::string>& parameters, L
 			Channel* chan = (*i)->chan;
 			if (chan->GetPrefixValue(user) < VOICE_VALUE && chan->IsBanned(user))
 			{
-				user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :Cannot send to channel (you're banned)", chan->name.c_str());
+				user->WriteNumeric(ERR_CANNOTSENDTOCHAN, chan->name, "Cannot send to channel (you're banned)");
 				return CMD_FAILURE;
 			}
 		}
diff --git a/src/coremods/core_user/cmd_part.cpp b/src/coremods/core_user/cmd_part.cpp
index 77aafd1b3..4da2787d9 100644
--- a/src/coremods/core_user/cmd_part.cpp
+++ b/src/coremods/core_user/cmd_part.cpp
@@ -46,13 +46,13 @@ CmdResult CommandPart::Handle (const std::vector<std::string>& parameters, User
 
 	if (!c)
 	{
-		user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+		user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 		return CMD_FAILURE;
 	}
 
 	if (!c->PartUser(user, reason))
 	{
-		user->WriteNumeric(ERR_NOTONCHANNEL, "%s :You're not on that channel", c->name.c_str());
+		user->WriteNumeric(ERR_NOTONCHANNEL, c->name, "You're not on that channel");
 		return CMD_FAILURE;
 	}
 
diff --git a/src/coremods/core_user/cmd_user.cpp b/src/coremods/core_user/cmd_user.cpp
index cbf4f5e08..37ac116df 100644
--- a/src/coremods/core_user/cmd_user.cpp
+++ b/src/coremods/core_user/cmd_user.cpp
@@ -40,7 +40,7 @@ CmdResult CommandUser::HandleLocal(const std::vector<std::string>& parameters, L
 			 * RFC says we must use this numeric, so we do. Let's make it a little more nub friendly though. :)
 			 *  -- Craig, and then w00t.
 			 */
-			user->WriteNumeric(ERR_NEEDMOREPARAMS, "USER :Your username is not valid");
+			user->WriteNumeric(ERR_NEEDMOREPARAMS, name, "Your username is not valid");
 			return CMD_FAILURE;
 		}
 		else
@@ -57,7 +57,7 @@ CmdResult CommandUser::HandleLocal(const std::vector<std::string>& parameters, L
 	}
 	else
 	{
-		user->WriteNumeric(ERR_ALREADYREGISTERED, ":You may not reregister");
+		user->WriteNumeric(ERR_ALREADYREGISTERED, "You may not reregister");
 		user->CommandFloodPenalty += 1000;
 		return CMD_FAILURE;
 	}
diff --git a/src/coremods/core_user/core_user.cpp b/src/coremods/core_user/core_user.cpp
index dd778548a..a2ffc009e 100644
--- a/src/coremods/core_user/core_user.cpp
+++ b/src/coremods/core_user/core_user.cpp
@@ -46,7 +46,7 @@ class CommandPass : public SplitCommand
 		if (user->registered == REG_ALL)
 		{
 			user->CommandFloodPenalty += 1000;
-			user->WriteNumeric(ERR_ALREADYREGISTERED, ":You may not reregister");
+			user->WriteNumeric(ERR_ALREADYREGISTERED, "You may not reregister");
 			return CMD_FAILURE;
 		}
 		user->password = parameters[0];
diff --git a/src/coremods/core_who.cpp b/src/coremods/core_who.cpp
index 8b9258d71..1bc03c78e 100644
--- a/src/coremods/core_who.cpp
+++ b/src/coremods/core_who.cpp
@@ -385,7 +385,7 @@ CmdResult CommandWho::Handle (const std::vector<std::string>& parameters, User *
 	/* Send the results out */
 	for (std::vector<std::string>::const_iterator n = whoresults.begin(); n != whoresults.end(); n++)
 		user->WriteServ(*n);
-	user->WriteNumeric(RPL_ENDOFWHO, "%s :End of /WHO list.", *parameters[0].c_str() ? parameters[0].c_str() : "*");
+	user->WriteNumeric(RPL_ENDOFWHO, (*parameters[0].c_str() ? parameters[0] : "*"), "End of /WHO list.");
 
 	// Penalize the user a bit for large queries
 	// (add one unit of penalty per 200 results)
diff --git a/src/coremods/core_whois.cpp b/src/coremods/core_whois.cpp
index ecc406a8c..0645eda4c 100644
--- a/src/coremods/core_whois.cpp
+++ b/src/coremods/core_whois.cpp
@@ -95,9 +95,9 @@ class WhoisNumericSink
 	{
 	}
 
-	void operator()(unsigned int numeric, const std::string& text) const
+	void operator()(Numeric::Numeric& numeric) const
 	{
-		whois.SendLine(numeric, text);
+		whois.SendLine(numeric);
 	}
 };
 
@@ -296,8 +296,8 @@ CmdResult CommandWhois::HandleLocal(const std::vector<std::string>& parameters,
 	else
 	{
 		/* no such nick/channel */
-		user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", !parameters[userindex].empty() ? parameters[userindex].c_str() : "*");
-		user->WriteNumeric(RPL_ENDOFWHOIS, "%s :End of /WHOIS list.", !parameters[userindex].empty() ? parameters[userindex].c_str() : "*");
+		user->WriteNumeric(Numerics::NoSuchNick(!parameters[userindex].empty() ? parameters[userindex] : "*"));
+		user->WriteNumeric(RPL_ENDOFWHOIS, (!parameters[userindex].empty() ? parameters[userindex] : "*"), "End of /WHOIS list.");
 		return CMD_FAILURE;
 	}
 
diff --git a/src/coremods/core_whowas.cpp b/src/coremods/core_whowas.cpp
index 79ce94cc9..e04a69200 100644
--- a/src/coremods/core_whowas.cpp
+++ b/src/coremods/core_whowas.cpp
@@ -35,14 +35,14 @@ CmdResult CommandWhowas::Handle (const std::vector<std::string>& parameters, Use
 	/* if whowas disabled in config */
 	if (!manager.IsEnabled())
 	{
-		user->WriteNumeric(ERR_UNKNOWNCOMMAND, "%s :This command has been disabled.", name.c_str());
+		user->WriteNumeric(ERR_UNKNOWNCOMMAND, name, "This command has been disabled.");
 		return CMD_FAILURE;
 	}
 
 	const WhoWas::Nick* const nick = manager.FindNick(parameters[0]);
 	if (!nick)
 	{
-		user->WriteNumeric(ERR_WASNOSUCHNICK, "%s :There was no such nickname", parameters[0].c_str());
+		user->WriteNumeric(ERR_WASNOSUCHNICK, parameters[0], "There was no such nickname");
 	}
 	else
 	{
@@ -51,18 +51,18 @@ CmdResult CommandWhowas::Handle (const std::vector<std::string>& parameters, Use
 		{
 			WhoWas::Entry* u = *i;
 
-			user->WriteNumeric(RPL_WHOWASUSER, "%s %s %s * :%s", parameters[0].c_str(), u->ident.c_str(),u->dhost.c_str(),u->gecos.c_str());
+			user->WriteNumeric(RPL_WHOWASUSER, parameters[0], u->ident, u->dhost, '*', u->gecos);
 
 			if (user->HasPrivPermission("users/auspex"))
-				user->WriteNumeric(RPL_WHOWASIP, "%s :was connecting from *@%s", parameters[0].c_str(), u->host.c_str());
+				user->WriteNumeric(RPL_WHOWASIP, parameters[0], InspIRCd::Format("was connecting from *@%s", u->host.c_str()));
 
 			std::string signon = InspIRCd::TimeString(u->signon);
 			bool hide_server = (!ServerInstance->Config->HideWhoisServer.empty() && !user->HasPrivPermission("servers/auspex"));
-			user->WriteNumeric(RPL_WHOISSERVER, "%s %s :%s", parameters[0].c_str(), (hide_server ? ServerInstance->Config->HideWhoisServer.c_str() : u->server.c_str()), signon.c_str());
+			user->WriteNumeric(RPL_WHOISSERVER, parameters[0], (hide_server ? ServerInstance->Config->HideWhoisServer : u->server), signon);
 		}
 	}
 
-	user->WriteNumeric(RPL_ENDOFWHOWAS, "%s :End of WHOWAS", parameters[0].c_str());
+	user->WriteNumeric(RPL_ENDOFWHOWAS, parameters[0], "End of WHOWAS");
 	return CMD_SUCCESS;
 }
 
diff --git a/src/coremods/core_xline/core_xline.cpp b/src/coremods/core_xline/core_xline.cpp
index 7fa7da019..93ac1db31 100644
--- a/src/coremods/core_xline/core_xline.cpp
+++ b/src/coremods/core_xline/core_xline.cpp
@@ -80,7 +80,7 @@ class CoreModXLine : public Module
 		}
 
 		// Send a numeric because if we deny then the core doesn't reply anything
-		user->WriteNumeric(ERR_ERRONEUSNICKNAME, "%s :Invalid nickname: %s", newnick.c_str(), xline->reason.c_str());
+		user->WriteNumeric(ERR_ERRONEUSNICKNAME, newnick, InspIRCd::Format("Invalid nickname: %s", xline->reason.c_str()));
 		return MOD_RES_DENY;
 	}
 
diff --git a/src/listmode.cpp b/src/listmode.cpp
index 35964dfb3..cd034688c 100644
--- a/src/listmode.cpp
+++ b/src/listmode.cpp
@@ -35,15 +35,15 @@ void ListModeBase::DisplayList(User* user, Channel* channel)
 	{
 		for (ModeList::const_iterator it = cd->list.begin(); it != cd->list.end(); ++it)
 		{
-			user->WriteNumeric(listnumeric, "%s %s %s %lu", channel->name.c_str(), it->mask.c_str(), it->setter.c_str(), (unsigned long) it->time);
+			user->WriteNumeric(listnumeric, channel->name, it->mask, it->setter, (unsigned long) it->time);
 		}
 	}
-	user->WriteNumeric(endoflistnumeric, "%s :%s", channel->name.c_str(), endofliststring.c_str());
+	user->WriteNumeric(endoflistnumeric, channel->name, endofliststring);
 }
 
 void ListModeBase::DisplayEmptyList(User* user, Channel* channel)
 {
-	user->WriteNumeric(endoflistnumeric, "%s :%s", channel->name.c_str(), endofliststring.c_str());
+	user->WriteNumeric(endoflistnumeric, channel->name, endofliststring);
 }
 
 void ListModeBase::RemoveMode(Channel* channel, Modes::ChangeList& changelist)
@@ -212,7 +212,7 @@ bool ListModeBase::ValidateParam(User*, Channel*, std::string&)
 
 void ListModeBase::TellListTooLong(User* source, Channel* channel, std::string& parameter)
 {
-	source->WriteNumeric(ERR_BANLISTFULL, "%s %s :Channel ban list is full", channel->name.c_str(), parameter.c_str());
+	source->WriteNumeric(ERR_BANLISTFULL, channel->name, parameter, "Channel ban list is full");
 }
 
 void ListModeBase::TellAlreadyOnList(User*, Channel*, std::string&)
diff --git a/src/mode.cpp b/src/mode.cpp
index 6038f6f5b..b29eda828 100644
--- a/src/mode.cpp
+++ b/src/mode.cpp
@@ -175,7 +175,7 @@ ModeAction PrefixMode::OnModeChange(User* source, User*, Channel* chan, std::str
 
 	if (!target)
 	{
-		source->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameter.c_str());
+		source->WriteNumeric(Numerics::NoSuchNick(parameter));
 		return MODEACTION_DENY;
 	}
 
@@ -263,11 +263,10 @@ ModeAction ModeParser::TryMode(User* user, User* targetuser, Channel* chan, Mode
 					}
 				}
 				if (neededmh)
-					user->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You must have channel %s access or above to %sset channel mode %c",
-						chan->name.c_str(), neededmh->name.c_str(), adding ? "" : "un", modechar);
+					user->WriteNumeric(ERR_CHANOPRIVSNEEDED, chan->name, InspIRCd::Format("You must have channel %s access or above to %sset channel mode %c",
+						neededmh->name.c_str(), adding ? "" : "un", modechar));
 				else
-					user->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You cannot %sset channel mode %c",
-						chan->name.c_str(), adding ? "" : "un", modechar);
+					user->WriteNumeric(ERR_CHANOPRIVSNEEDED, chan->name, InspIRCd::Format("You cannot %sset channel mode %c", (adding ? "" : "un"), modechar));
 				return MODEACTION_DENY;
 			}
 		}
@@ -294,8 +293,8 @@ ModeAction ModeParser::TryMode(User* user, User* targetuser, Channel* chan, Mode
 		char* disabled = (type == MODETYPE_CHANNEL) ? ServerInstance->Config->DisabledCModes : ServerInstance->Config->DisabledUModes;
 		if (disabled[modechar - 'A'])
 		{
-			user->WriteNumeric(ERR_NOPRIVILEGES, ":Permission Denied - %s mode %c has been locked by the administrator",
-				type == MODETYPE_CHANNEL ? "channel" : "user", modechar);
+			user->WriteNumeric(ERR_NOPRIVILEGES, InspIRCd::Format("Permission Denied - %s mode %c has been locked by the administrator",
+				type == MODETYPE_CHANNEL ? "channel" : "user", modechar));
 			return MODEACTION_DENY;
 		}
 	}
@@ -305,13 +304,13 @@ ModeAction ModeParser::TryMode(User* user, User* targetuser, Channel* chan, Mode
 		/* It's an oper only mode, and they don't have access to it. */
 		if (user->IsOper())
 		{
-			user->WriteNumeric(ERR_NOPRIVILEGES, ":Permission Denied - Oper type %s does not have access to set %s mode %c",
-					user->oper->name.c_str(), type == MODETYPE_CHANNEL ? "channel" : "user", modechar);
+			user->WriteNumeric(ERR_NOPRIVILEGES, InspIRCd::Format("Permission Denied - Oper type %s does not have access to set %s mode %c",
+					user->oper->name.c_str(), type == MODETYPE_CHANNEL ? "channel" : "user", modechar));
 		}
 		else
 		{
-			user->WriteNumeric(ERR_NOPRIVILEGES, ":Permission Denied - Only operators may set %s mode %c",
-					type == MODETYPE_CHANNEL ? "channel" : "user", modechar);
+			user->WriteNumeric(ERR_NOPRIVILEGES, InspIRCd::Format("Permission Denied - Only operators may set %s mode %c",
+					type == MODETYPE_CHANNEL ? "channel" : "user", modechar));
 		}
 		return MODEACTION_DENY;
 	}
@@ -359,7 +358,7 @@ void ModeParser::ModeParamsToChangeList(User* user, ModeType type, const std::ve
 		if (!mh)
 		{
 			/* No mode handler? Unknown mode character then. */
-			user->WriteNumeric(type == MODETYPE_CHANNEL ? ERR_UNKNOWNMODE : ERR_UNKNOWNSNOMASK, "%c :is unknown mode char to me", modechar);
+			user->WriteNumeric(type == MODETYPE_CHANNEL ? ERR_UNKNOWNMODE : ERR_UNKNOWNSNOMASK, modechar, "is unknown mode char to me");
 			continue;
 		}
 
diff --git a/src/modes/umode_s.cpp b/src/modes/umode_s.cpp
index 08ee7f562..f0fa5e94b 100644
--- a/src/modes/umode_s.cpp
+++ b/src/modes/umode_s.cpp
@@ -99,7 +99,7 @@ std::string ModeUserServerNoticeMask::ProcessNoticeMasks(User* user, const std::
 				{
 					if (!ServerInstance->SNO->IsSnomaskUsable(*i))
 					{
-						user->WriteNumeric(ERR_UNKNOWNSNOMASK, "%c :is unknown snomask char to me", *i);
+						user->WriteNumeric(ERR_UNKNOWNSNOMASK, *i, "is unknown snomask char to me");
 						continue;
 					}
 				}
diff --git a/src/modules.cpp b/src/modules.cpp
index 292986df5..28ded66d8 100644
--- a/src/modules.cpp
+++ b/src/modules.cpp
@@ -135,7 +135,7 @@ void		Module::OnGarbageCollect() { DetachEvent(I_OnGarbageCollect); }
 ModResult	Module::OnSetConnectClass(LocalUser* user, ConnectClass* myclass) { DetachEvent(I_OnSetConnectClass); return MOD_RES_PASSTHRU; }
 void 		Module::OnText(User*, void*, int, const std::string&, char, CUList&) { DetachEvent(I_OnText); }
 ModResult	Module::OnNamesListItem(User*, Membership*, std::string&, std::string&) { DetachEvent(I_OnNamesListItem); return MOD_RES_PASSTHRU; }
-ModResult	Module::OnNumeric(User*, unsigned int, const std::string&) { DetachEvent(I_OnNumeric); return MOD_RES_PASSTHRU; }
+ModResult	Module::OnNumeric(User*, const Numeric::Numeric&) { DetachEvent(I_OnNumeric); return MOD_RES_PASSTHRU; }
 ModResult   Module::OnAcceptConnection(int, ListenSocket*, irc::sockets::sockaddrs*, irc::sockets::sockaddrs*) { DetachEvent(I_OnAcceptConnection); return MOD_RES_PASSTHRU; }
 void		Module::OnSendWhoLine(User*, const std::vector<std::string>&, User*, Membership*, std::string&) { DetachEvent(I_OnSendWhoLine); }
 void		Module::OnSetUserIP(LocalUser*) { DetachEvent(I_OnSetUserIP); }
diff --git a/src/modules/m_abbreviation.cpp b/src/modules/m_abbreviation.cpp
index d2fa09c4e..85709080f 100644
--- a/src/modules/m_abbreviation.cpp
+++ b/src/modules/m_abbreviation.cpp
@@ -49,7 +49,7 @@ class ModuleAbbreviation : public Module
 			{
 				if (matchlist.length() > 450)
 				{
-					user->WriteNumeric(420, ":Ambiguous abbreviation and too many possible matches.");
+					user->WriteNumeric(420, "Ambiguous abbreviation and too many possible matches.");
 					return MOD_RES_DENY;
 				}
 
@@ -67,7 +67,7 @@ class ModuleAbbreviation : public Module
 		/* Ambiguous command, list the matches */
 		if (!matchlist.empty())
 		{
-			user->WriteNumeric(420, ":Ambiguous abbreviation, possible matches: %s%s", foundcommand.c_str(), matchlist.c_str());
+			user->WriteNumeric(420, InspIRCd::Format("Ambiguous abbreviation, possible matches: %s%s", foundcommand.c_str(), matchlist.c_str()));
 			return MOD_RES_DENY;
 		}
 
diff --git a/src/modules/m_alias.cpp b/src/modules/m_alias.cpp
index 3a4bf5348..9184b10af 100644
--- a/src/modules/m_alias.cpp
+++ b/src/modules/m_alias.cpp
@@ -253,14 +253,14 @@ class ModuleAlias : public Module
 			User* u = ServerInstance->FindNick(a->RequiredNick);
 			if (!u)
 			{
-				user->WriteNumeric(ERR_NOSUCHNICK, a->RequiredNick + " :is currently unavailable. Please try again later.");
+				user->WriteNumeric(ERR_NOSUCHNICK, a->RequiredNick, "is currently unavailable. Please try again later.");
 				return 1;
 			}
 
 			if ((a->ULineOnly) && (!u->server->IsULine()))
 			{
 				ServerInstance->SNO->WriteToSnoMask('a', "NOTICE -- Service "+a->RequiredNick+" required by alias "+a->AliasedCommand+" is not on a u-lined server, possibly underhanded antics detected!");
-				user->WriteNumeric(ERR_NOSUCHNICK, a->RequiredNick + " :is an imposter! Please inform an IRC operator as soon as possible.");
+				user->WriteNumeric(ERR_NOSUCHNICK, a->RequiredNick, "is an imposter! Please inform an IRC operator as soon as possible.");
 				return 1;
 			}
 		}
diff --git a/src/modules/m_allowinvite.cpp b/src/modules/m_allowinvite.cpp
index 05e76113a..6a4db1822 100644
--- a/src/modules/m_allowinvite.cpp
+++ b/src/modules/m_allowinvite.cpp
@@ -47,7 +47,7 @@ class ModuleAllowInvite : public Module
 			if (res == MOD_RES_DENY)
 			{
 				// Matching extban, explicitly deny /invite
-				user->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You are banned from using INVITE", channel->name.c_str());
+				user->WriteNumeric(ERR_CHANOPRIVSNEEDED, channel->name, "You are banned from using INVITE");
 				return res;
 			}
 			if (channel->IsModeSet(ni) || res == MOD_RES_ALLOW)
diff --git a/src/modules/m_autoop.cpp b/src/modules/m_autoop.cpp
index 2b9c2e1c2..8c7f300da 100644
--- a/src/modules/m_autoop.cpp
+++ b/src/modules/m_autoop.cpp
@@ -52,8 +52,7 @@ class AutoOpList : public ListModeBase
 
 		if (adding && !mh)
 		{
-			source->WriteNumeric(415, "%s :Cannot find prefix mode '%s' for autoop",
-				mid.c_str(), mid.c_str());
+			source->WriteNumeric(415, mid, InspIRCd::Format("Cannot find prefix mode '%s' for autoop", mid.c_str()));
 			return MOD_RES_DENY;
 		}
 		else if (!mh)
@@ -64,8 +63,7 @@ class AutoOpList : public ListModeBase
 			return MOD_RES_DENY;
 		if (mh->GetLevelRequired() > mylevel)
 		{
-			source->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You must be able to set mode '%s' to include it in an autoop",
-				channel->name.c_str(), mid.c_str());
+			source->WriteNumeric(ERR_CHANOPRIVSNEEDED, channel->name, InspIRCd::Format("You must be able to set mode '%s' to include it in an autoop", mid.c_str()));
 			return MOD_RES_DENY;
 		}
 		return MOD_RES_PASSTHRU;
diff --git a/src/modules/m_banredirect.cpp b/src/modules/m_banredirect.cpp
index d3490acc0..c44a10f05 100644
--- a/src/modules/m_banredirect.cpp
+++ b/src/modules/m_banredirect.cpp
@@ -82,7 +82,7 @@ class BanRedirect : public ModeWatcher
 			ListModeBase::ModeList* list = banlm->GetList(channel);
 			if ((list) && (adding) && (maxbans <= list->size()))
 			{
-				source->WriteNumeric(ERR_BANLISTFULL, "%s :Channel ban list for %s is full (maximum entries for this channel is %u)", channel->name.c_str(), channel->name.c_str(), maxbans);
+				source->WriteNumeric(ERR_BANLISTFULL, channel->name, InspIRCd::Format("Channel ban list for %s is full (maximum entries for this channel is %u)", channel->name.c_str(), maxbans));
 				return false;
 			}
 
@@ -150,25 +150,25 @@ class BanRedirect : public ModeWatcher
 				{
 					if (!ServerInstance->IsChannel(mask[CHAN]))
 					{
-						source->WriteNumeric(ERR_NOSUCHCHANNEL, "%s :Invalid channel name in redirection (%s)", channel->name.c_str(), mask[CHAN].c_str());
+						source->WriteNumeric(ERR_NOSUCHCHANNEL, channel->name, InspIRCd::Format("Invalid channel name in redirection (%s)", mask[CHAN].c_str()));
 						return false;
 					}
 
 					Channel *c = ServerInstance->FindChan(mask[CHAN]);
 					if (!c)
 					{
-						source->WriteNumeric(690, ":Target channel %s must exist to be set as a redirect.", mask[CHAN].c_str());
+						source->WriteNumeric(690, InspIRCd::Format("Target channel %s must exist to be set as a redirect.", mask[CHAN].c_str()));
 						return false;
 					}
 					else if (adding && c->GetPrefixValue(source) < OP_VALUE)
 					{
-						source->WriteNumeric(690, ":You must be opped on %s to set it as a redirect.", mask[CHAN].c_str());
+						source->WriteNumeric(690, InspIRCd::Format("You must be opped on %s to set it as a redirect.", mask[CHAN].c_str()));
 						return false;
 					}
 
 					if (assign(channel->name) == mask[CHAN])
 					{
-						source->WriteNumeric(690, "%s :You cannot set a ban redirection to the channel the ban is on", channel->name.c_str());
+						source->WriteNumeric(690, channel->name, "You cannot set a ban redirection to the channel the ban is on");
 						return false;
 					}
 				}
@@ -311,13 +311,13 @@ class ModuleBanRedirect : public Module
 
 						if(destchan && destchan->IsModeSet(redirectmode) && !destlimit.empty() && (destchan->GetUserCounter() >= atoi(destlimit.c_str())))
 						{
-							user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s :Cannot join channel (You are banned)", chan->name.c_str());
+							user->WriteNumeric(ERR_BANNEDFROMCHAN, chan->name, "Cannot join channel (You are banned)");
 							return MOD_RES_DENY;
 						}
 						else
 						{
-							user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s :Cannot join channel (You are banned)", chan->name.c_str());
-							user->WriteNumeric(470, "%s %s :You are banned from this channel, so you are automatically transferred to the redirected channel.", chan->name.c_str(), redir->targetchan.c_str());
+							user->WriteNumeric(ERR_BANNEDFROMCHAN, chan->name, "Cannot join channel (You are banned)");
+							user->WriteNumeric(470, chan->name, redir->targetchan, "You are banned from this channel, so you are automatically transferred to the redirected channel.");
 							nofollow = true;
 							Channel::JoinUser(user, redir->targetchan);
 							nofollow = false;
diff --git a/src/modules/m_blockcaps.cpp b/src/modules/m_blockcaps.cpp
index 57f86afd1..cd7698d69 100644
--- a/src/modules/m_blockcaps.cpp
+++ b/src/modules/m_blockcaps.cpp
@@ -74,7 +74,7 @@ public:
 
 				if (((caps * 100) / text.length()) >= percent)
 				{
-					user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :Your message cannot contain %d%% or more capital letters if it's longer than %d characters", c->name.c_str(), percent, minlen);
+					user->WriteNumeric(ERR_CANNOTSENDTOCHAN, c->name, InspIRCd::Format("Your message cannot contain %d%% or more capital letters if it's longer than %d characters", percent, minlen));
 					return MOD_RES_DENY;
 				}
 			}
diff --git a/src/modules/m_blockcolor.cpp b/src/modules/m_blockcolor.cpp
index a08ad7c6f..567bdb249 100644
--- a/src/modules/m_blockcolor.cpp
+++ b/src/modules/m_blockcolor.cpp
@@ -67,7 +67,7 @@ class ModuleBlockColor : public Module
 						case 21:
 						case 22:
 						case 31:
-							user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :Can't send colors to channel (+c set)", c->name.c_str());
+							user->WriteNumeric(ERR_CANNOTSENDTOCHAN, c->name, "Can't send colors to channel (+c set)");
 							return MOD_RES_DENY;
 						break;
 					}
diff --git a/src/modules/m_callerid.cpp b/src/modules/m_callerid.cpp
index 0eb208138..149767f18 100644
--- a/src/modules/m_callerid.cpp
+++ b/src/modules/m_callerid.cpp
@@ -225,7 +225,7 @@ public:
 		ACCEPTAction action = GetTargetAndAction(tok, user);
 		if (!action.first)
 		{
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", tok.c_str());
+			user->WriteNumeric(Numerics::NoSuchNick(tok));
 			return CMD_FAILURE;
 		}
 
@@ -271,7 +271,7 @@ public:
 			for (callerid_data::UserSet::iterator i = dat->accepting.begin(); i != dat->accepting.end(); ++i)
 				user->WriteNumeric(RPL_ACCEPTLIST, (*i)->nick);
 		}
-		user->WriteNumeric(RPL_ENDOFACCEPT, ":End of ACCEPT list");
+		user->WriteNumeric(RPL_ENDOFACCEPT, "End of ACCEPT list");
 	}
 
 	bool AddAccept(User* user, User* whotoadd)
@@ -280,12 +280,12 @@ public:
 		callerid_data* dat = extInfo.get(user, true);
 		if (dat->accepting.size() >= maxaccepts)
 		{
-			user->WriteNumeric(ERR_ACCEPTFULL, ":Accept list is full (limit is %d)", maxaccepts);
+			user->WriteNumeric(ERR_ACCEPTFULL, InspIRCd::Format("Accept list is full (limit is %d)", maxaccepts));
 			return false;
 		}
 		if (!dat->accepting.insert(whotoadd).second)
 		{
-			user->WriteNumeric(ERR_ACCEPTEXIST, "%s :is already on your accept list", whotoadd->nick.c_str());
+			user->WriteNumeric(ERR_ACCEPTEXIST, whotoadd->nick, "is already on your accept list");
 			return false;
 		}
 
@@ -303,12 +303,12 @@ public:
 		callerid_data* dat = extInfo.get(user, false);
 		if (!dat)
 		{
-			user->WriteNumeric(ERR_ACCEPTNOT, "%s :is not on your accept list", whotoremove->nick.c_str());
+			user->WriteNumeric(ERR_ACCEPTNOT, whotoremove->nick, "is not on your accept list");
 			return false;
 		}
 		if (!dat->accepting.erase(whotoremove))
 		{
-			user->WriteNumeric(ERR_ACCEPTNOT, "%s :is not on your accept list", whotoremove->nick.c_str());
+			user->WriteNumeric(ERR_ACCEPTNOT, whotoremove->nick, "is not on your accept list");
 			return false;
 		}
 
@@ -395,10 +395,10 @@ public:
 		{
 			time_t now = ServerInstance->Time();
 			/* +g and *not* accepted */
-			user->WriteNumeric(ERR_TARGUMODEG, "%s :is in +g mode (server-side ignore).", dest->nick.c_str());
+			user->WriteNumeric(ERR_TARGUMODEG, dest->nick, "is in +g mode (server-side ignore).");
 			if (now > (dat->lastnotify + (time_t)notify_cooldown))
 			{
-				user->WriteNumeric(RPL_TARGNOTIFY, "%s :has been informed that you messaged them.", dest->nick.c_str());
+				user->WriteNumeric(RPL_TARGNOTIFY, dest->nick, "has been informed that you messaged them.");
 				dest->SendText(":%s %03d %s %s %s@%s :is messaging you, and you have umode +g. Use /ACCEPT +%s to allow.",
 						ServerInstance->Config->ServerName.c_str(), RPL_UMODEGMSG, dest->nick.c_str(), user->nick.c_str(), user->ident.c_str(), user->dhost.c_str(), user->nick.c_str());
 				dat->lastnotify = now;
diff --git a/src/modules/m_cap.cpp b/src/modules/m_cap.cpp
index 09d5e604d..e6e01570d 100644
--- a/src/modules/m_cap.cpp
+++ b/src/modules/m_cap.cpp
@@ -398,7 +398,7 @@ class CommandCap : public SplitCommand
 		}
 		else
 		{
-			user->WriteNumeric(ERR_INVALIDCAPSUBCOMMAND, "%s :Invalid CAP subcommand", subcommand.c_str());
+			user->WriteNumeric(ERR_INVALIDCAPSUBCOMMAND, subcommand, "Invalid CAP subcommand");
 			return CMD_FAILURE;
 		}
 
diff --git a/src/modules/m_cban.cpp b/src/modules/m_cban.cpp
index 4fb0653a9..1ddc625db 100644
--- a/src/modules/m_cban.cpp
+++ b/src/modules/m_cban.cpp
@@ -181,7 +181,7 @@ class ModuleCBan : public Module
 		if (rl)
 		{
 			// Channel is banned.
-			user->WriteNumeric(384, "%s :Cannot join channel, CBANed (%s)", cname.c_str(), rl->reason.c_str());
+			user->WriteNumeric(384, cname, InspIRCd::Format("Cannot join channel, CBANed (%s)", rl->reason.c_str()));
 			ServerInstance->SNO->WriteGlobalSno('a', "%s tried to join %s which is CBANed (%s)",
 				 user->nick.c_str(), cname.c_str(), rl->reason.c_str());
 			return MOD_RES_DENY;
diff --git a/src/modules/m_censor.cpp b/src/modules/m_censor.cpp
index da22b5153..7d8c74024 100644
--- a/src/modules/m_censor.cpp
+++ b/src/modules/m_censor.cpp
@@ -79,7 +79,7 @@ class ModuleCensor : public Module
 			{
 				if (index->second.empty())
 				{
-					user->WriteNumeric(ERR_WORDFILTERED, "%s %s :Your message contained a censored word, and was blocked", ((Channel*)dest)->name.c_str(), index->first.c_str());
+					user->WriteNumeric(ERR_WORDFILTERED, ((Channel*)dest)->name, index->first, "Your message contained a censored word, and was blocked");
 					return MOD_RES_DENY;
 				}
 
diff --git a/src/modules/m_chanfilter.cpp b/src/modules/m_chanfilter.cpp
index 53428a5a8..a7bc21557 100644
--- a/src/modules/m_chanfilter.cpp
+++ b/src/modules/m_chanfilter.cpp
@@ -37,7 +37,7 @@ class ChanFilter : public ListModeBase
 	{
 		if (word.length() > 35)
 		{
-			user->WriteNumeric(935, "%s %s :word is too long for censor list", chan->name.c_str(), word.c_str());
+			user->WriteNumeric(935, chan->name, word, "%word is too long for censor list");
 			return false;
 		}
 
@@ -46,17 +46,17 @@ class ChanFilter : public ListModeBase
 
 	void TellListTooLong(User* user, Channel* chan, std::string &word)
 	{
-		user->WriteNumeric(939, "%s %s :Channel spamfilter list is full", chan->name.c_str(), word.c_str());
+		user->WriteNumeric(939, chan->name, word, "Channel spamfilter list is full");
 	}
 
 	void TellAlreadyOnList(User* user, Channel* chan, std::string &word)
 	{
-		user->WriteNumeric(937, "%s :The word %s is already on the spamfilter list", chan->name.c_str(), word.c_str());
+		user->WriteNumeric(937, chan->name, InspIRCd::Format("The word %s is already on the spamfilter list", word.c_str()));
 	}
 
 	void TellNotSet(User* user, Channel* chan, std::string &word)
 	{
-		user->WriteNumeric(938, "%s :No such spamfilter word is set", chan->name.c_str());
+		user->WriteNumeric(938, chan->name, "No such spamfilter word is set");
 	}
 };
 
@@ -98,9 +98,9 @@ class ModuleChanFilter : public Module
 				if (InspIRCd::Match(text, i->mask))
 				{
 					if (hidemask)
-						user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :Cannot send to channel (your message contained a censored word)", chan->name.c_str());
+						user->WriteNumeric(ERR_CANNOTSENDTOCHAN, chan->name, "Cannot send to channel (your message contained a censored word)");
 					else
-						user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s %s :Cannot send to channel (your message contained a censored word)", chan->name.c_str(), i->mask.c_str());
+						user->WriteNumeric(ERR_CANNOTSENDTOCHAN, chan->name, i->mask, "Cannot send to channel (your message contained a censored word)");
 					return MOD_RES_DENY;
 				}
 			}
diff --git a/src/modules/m_chghost.cpp b/src/modules/m_chghost.cpp
index 43b2a323b..163f1f2eb 100644
--- a/src/modules/m_chghost.cpp
+++ b/src/modules/m_chghost.cpp
@@ -59,7 +59,7 @@ class CommandChghost : public Command
 		// Allow services to change the host of unregistered users
 		if ((!dest) || ((dest->registered != REG_ALL) && (!user->server->IsULine())))
 		{
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+			user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 			return CMD_FAILURE;
 		}
 
diff --git a/src/modules/m_chgident.cpp b/src/modules/m_chgident.cpp
index c855216bf..0b4e78f12 100644
--- a/src/modules/m_chgident.cpp
+++ b/src/modules/m_chgident.cpp
@@ -41,7 +41,7 @@ class CommandChgident : public Command
 
 		if ((!dest) || (dest->registered != REG_ALL))
 		{
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+			user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 			return CMD_FAILURE;
 		}
 
diff --git a/src/modules/m_chgname.cpp b/src/modules/m_chgname.cpp
index 830d5070b..3ad9cede9 100644
--- a/src/modules/m_chgname.cpp
+++ b/src/modules/m_chgname.cpp
@@ -39,7 +39,7 @@ class CommandChgname : public Command
 
 		if ((!dest) || (dest->registered != REG_ALL))
 		{
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+			user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 			return CMD_FAILURE;
 		}
 
diff --git a/src/modules/m_commonchans.cpp b/src/modules/m_commonchans.cpp
index eab53b9bc..e04217e71 100644
--- a/src/modules/m_commonchans.cpp
+++ b/src/modules/m_commonchans.cpp
@@ -47,7 +47,7 @@ class ModulePrivacyMode : public Module
 			User* t = (User*)dest;
 			if (!user->IsOper() && (t->IsModeSet(pm)) && (!user->server->IsULine()) && !user->SharesChannelWith(t))
 			{
-				user->WriteNumeric(ERR_CANTSENDTOUSER, "%s :You are not permitted to send private messages to this user (+c set)", t->nick.c_str());
+				user->WriteNumeric(ERR_CANTSENDTOUSER, t->nick, "You are not permitted to send private messages to this user (+c set)");
 				return MOD_RES_DENY;
 			}
 		}
diff --git a/src/modules/m_cycle.cpp b/src/modules/m_cycle.cpp
index c8b6bd8b4..202cb123f 100644
--- a/src/modules/m_cycle.cpp
+++ b/src/modules/m_cycle.cpp
@@ -44,7 +44,7 @@ class CommandCycle : public SplitCommand
 
 		if (!channel)
 		{
-			user->WriteNumeric(ERR_NOSUCHCHANNEL, "%s :No such channel", parameters[0].c_str());
+			user->WriteNumeric(ERR_NOSUCHCHANNEL, parameters[0], "No such channel");
 			return CMD_FAILURE;
 		}
 
@@ -64,7 +64,7 @@ class CommandCycle : public SplitCommand
 		}
 		else
 		{
-			user->WriteNumeric(ERR_NOTONCHANNEL, "%s :You're not on that channel", channel->name.c_str());
+			user->WriteNumeric(ERR_NOTONCHANNEL, channel->name, "You're not on that channel");
 		}
 
 		return CMD_FAILURE;
diff --git a/src/modules/m_dccallow.cpp b/src/modules/m_dccallow.cpp
index 45a230465..21cc97aa5 100644
--- a/src/modules/m_dccallow.cpp
+++ b/src/modules/m_dccallow.cpp
@@ -120,7 +120,7 @@ class CommandDccallow : public Command
 				}
 				else
 				{
-					user->WriteNumeric(998, ":DCCALLOW command not understood. For help on DCCALLOW, type /DCCALLOW HELP");
+					user->WriteNumeric(998, "DCCALLOW command not understood. For help on DCCALLOW, type /DCCALLOW HELP");
 					return CMD_FAILURE;
 				}
 			}
@@ -143,7 +143,7 @@ class CommandDccallow : public Command
 							if (i->nickname == target->nick)
 							{
 								dl->erase(i);
-								user->WriteNumeric(995, "%s :Removed %s from your DCCALLOW list", user->nick.c_str(), target->nick.c_str());
+								user->WriteNumeric(995, user->nick, InspIRCd::Format("Removed %s from your DCCALLOW list", target->nick.c_str()));
 								break;
 							}
 						}
@@ -153,7 +153,7 @@ class CommandDccallow : public Command
 				{
 					if (target == user)
 					{
-						user->WriteNumeric(996, "%s :You cannot add yourself to your own DCCALLOW list!", user->nick.c_str());
+						user->WriteNumeric(996, user->nick, "You cannot add yourself to your own DCCALLOW list!");
 						return CMD_FAILURE;
 					}
 
@@ -168,7 +168,7 @@ class CommandDccallow : public Command
 
 					if (dl->size() >= maxentries)
 					{
-						user->WriteNumeric(996, "%s :Too many nicks on DCCALLOW list", user->nick.c_str());
+						user->WriteNumeric(996, user->nick, "Too many nicks on DCCALLOW list");
 						return CMD_FAILURE;
 					}
 
@@ -176,7 +176,7 @@ class CommandDccallow : public Command
 					{
 						if (k->nickname == target->nick)
 						{
-							user->WriteNumeric(996, "%s :%s is already on your DCCALLOW list", user->nick.c_str(), target->nick.c_str());
+							user->WriteNumeric(996, user->nick, InspIRCd::Format("%s is already on your DCCALLOW list", target->nick.c_str()));
 							return CMD_FAILURE;
 						}
 					}
@@ -207,11 +207,11 @@ class CommandDccallow : public Command
 
 					if (length > 0)
 					{
-						user->WriteNumeric(993, "%s :Added %s to DCCALLOW list for %ld seconds", user->nick.c_str(), target->nick.c_str(), length);
+						user->WriteNumeric(993, user->nick, InspIRCd::Format("Added %s to DCCALLOW list for %ld seconds", target->nick.c_str(), length));
 					}
 					else
 					{
-						user->WriteNumeric(994, "%s :Added %s to DCCALLOW list for this session", user->nick.c_str(), target->nick.c_str());
+						user->WriteNumeric(994, user->nick, InspIRCd::Format("Added %s to DCCALLOW list for this session", target->nick.c_str()));
 					}
 
 					/* route it. */
@@ -221,7 +221,7 @@ class CommandDccallow : public Command
 			else
 			{
 				// nick doesn't exist
-				user->WriteNumeric(401, "%s :No such nick/channel", nick.c_str());
+				user->WriteNumeric(Numerics::NoSuchNick(nick));
 				return CMD_FAILURE;
 			}
 		}
@@ -236,8 +236,8 @@ class CommandDccallow : public Command
 	void DisplayHelp(User* user)
 	{
 		for (size_t i = 0; i < sizeof(helptext)/sizeof(helptext[0]); i++)
-			user->WriteNumeric(998, ":%s", helptext[i]);
-		user->WriteNumeric(999, ":End of DCCALLOW HELP");
+			user->WriteNumeric(998, helptext[i]);
+		user->WriteNumeric(999, "End of DCCALLOW HELP");
 
 		LocalUser* localuser = IS_LOCAL(user);
 		if (localuser)
@@ -247,18 +247,18 @@ class CommandDccallow : public Command
 	void DisplayDCCAllowList(User* user)
 	{
 		 // display current DCCALLOW list
-		user->WriteNumeric(990, ":Users on your DCCALLOW list:");
+		user->WriteNumeric(990, "Users on your DCCALLOW list:");
 
 		dl = ext.get(user);
 		if (dl)
 		{
 			for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 			{
-				user->WriteNumeric(991, "%s :%s (%s)", user->nick.c_str(), c->nickname.c_str(), c->hostmask.c_str());
+				user->WriteNumeric(991, user->nick, InspIRCd::Format("%s (%s)", c->nickname.c_str(), c->hostmask.c_str()));
 			}
 		}
 
-		user->WriteNumeric(992, ":End of DCCALLOW list");
+		user->WriteNumeric(992, "End of DCCALLOW list");
 	}
 
 };
@@ -400,7 +400,7 @@ class ModuleDCCAllow : public Module
 					{
 						if (iter2->length != 0 && (iter2->set_on + iter2->length) <= ServerInstance->Time())
 						{
-							u->WriteNumeric(997, "%s :DCCALLOW entry for %s has expired", u->nick.c_str(), iter2->nickname.c_str());
+							u->WriteNumeric(997, u->nick, InspIRCd::Format("DCCALLOW entry for %s has expired", iter2->nickname.c_str()));
 							iter2 = dl->erase(iter2);
 						}
 						else
@@ -435,7 +435,7 @@ class ModuleDCCAllow : public Module
 						{
 
 							u->WriteNotice(i->nickname + " left the network or changed their nickname and has been removed from your DCCALLOW list");
-							u->WriteNumeric(995, "%s :Removed %s from your DCCALLOW list", u->nick.c_str(), i->nickname.c_str());
+							u->WriteNumeric(995, u->nick, InspIRCd::Format("Removed %s from your DCCALLOW list", i->nickname.c_str()));
 							dl->erase(i);
 							break;
 						}
diff --git a/src/modules/m_delaymsg.cpp b/src/modules/m_delaymsg.cpp
index f64297e15..1ad41cc57 100644
--- a/src/modules/m_delaymsg.cpp
+++ b/src/modules/m_delaymsg.cpp
@@ -118,8 +118,7 @@ ModResult ModuleDelayMsg::OnUserPreMessage(User* user, void* dest, int target_ty
 	{
 		if (channel->GetPrefixValue(user) < VOICE_VALUE)
 		{
-			user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :You must wait %d seconds after joining to send to channel (+d)",
-				channel->name.c_str(), len);
+			user->WriteNumeric(ERR_CANNOTSENDTOCHAN, channel->name, InspIRCd::Format("You must wait %d seconds after joining to send to channel (+d)", len));
 			return MOD_RES_DENY;
 		}
 	}
diff --git a/src/modules/m_denychans.cpp b/src/modules/m_denychans.cpp
index 6378ba273..467c8a03b 100644
--- a/src/modules/m_denychans.cpp
+++ b/src/modules/m_denychans.cpp
@@ -113,13 +113,13 @@ class ModuleDenyChannels : public Module
 						Channel *newchan = ServerInstance->FindChan(redirect);
 						if ((!newchan) || (!newchan->IsModeSet(redirectmode)))
 						{
-							user->WriteNumeric(926, "%s :Channel %s is forbidden, redirecting to %s: %s", cname.c_str(),cname.c_str(),redirect.c_str(), reason.c_str());
+							user->WriteNumeric(926, cname, InspIRCd::Format("Channel %s is forbidden, redirecting to %s: %s", cname.c_str(), redirect.c_str(), reason.c_str()));
 							Channel::JoinUser(user, redirect);
 							return MOD_RES_DENY;
 						}
 					}
 
-					user->WriteNumeric(926, "%s :Channel %s is forbidden: %s", cname.c_str(),cname.c_str(),reason.c_str());
+					user->WriteNumeric(926, cname, InspIRCd::Format("Channel %s is forbidden: %s", cname.c_str(), reason.c_str()));
 					return MOD_RES_DENY;
 				}
 			}
diff --git a/src/modules/m_dnsbl.cpp b/src/modules/m_dnsbl.cpp
index 5eaa8c279..726ee1351 100644
--- a/src/modules/m_dnsbl.cpp
+++ b/src/modules/m_dnsbl.cpp
@@ -117,13 +117,13 @@ class DNSBLResolver : public DNS::Request
 				{
 					if (!ConfEntry->ident.empty())
 					{
-						them->WriteNumeric(304, ":Your ident has been set to " + ConfEntry->ident + " because you matched " + reason);
+						them->WriteNumeric(304, "Your ident has been set to " + ConfEntry->ident + " because you matched " + reason);
 						them->ChangeIdent(ConfEntry->ident);
 					}
 
 					if (!ConfEntry->host.empty())
 					{
-						them->WriteNumeric(304, ":Your host has been set to " + ConfEntry->host + " because you matched " + reason);
+						them->WriteNumeric(304, "Your host has been set to " + ConfEntry->host + " because you matched " + reason);
 						them->ChangeDisplayedHost(ConfEntry->host);
 					}
 
diff --git a/src/modules/m_exemptchanops.cpp b/src/modules/m_exemptchanops.cpp
index 076445644..2884385fb 100644
--- a/src/modules/m_exemptchanops.cpp
+++ b/src/modules/m_exemptchanops.cpp
@@ -32,7 +32,7 @@ class ExemptChanOps : public ListModeBase
 		std::string::size_type p = word.find(':');
 		if (p == std::string::npos)
 		{
-			user->WriteNumeric(955, "%s %s :Invalid exemptchanops entry, format is <restriction>:<prefix>", chan->name.c_str(), word.c_str());
+			user->WriteNumeric(955, chan->name, word, "Invalid exemptchanops entry, format is <restriction>:<prefix>");
 			return false;
 		}
 
@@ -45,7 +45,7 @@ class ExemptChanOps : public ListModeBase
 
 		if (!ServerInstance->Modes->FindMode(restriction, MODETYPE_CHANNEL))
 		{
-			user->WriteNumeric(955, "%s %s :Unknown restriction", chan->name.c_str(), restriction.c_str());
+			user->WriteNumeric(955, chan->name, restriction, "Unknown restriction");
 			return false;
 		}
 
@@ -54,17 +54,17 @@ class ExemptChanOps : public ListModeBase
 
 	void TellListTooLong(User* user, Channel* chan, std::string &word)
 	{
-		user->WriteNumeric(959, "%s %s :Channel exemptchanops list is full", chan->name.c_str(), word.c_str());
+		user->WriteNumeric(959, chan->name, word, "Channel exemptchanops list is full");
 	}
 
 	void TellAlreadyOnList(User* user, Channel* chan, std::string &word)
 	{
-		user->WriteNumeric(957, "%s :The word %s is already on the exemptchanops list", chan->name.c_str(), word.c_str());
+		user->WriteNumeric(957, chan->name, InspIRCd::Format("The word %s is already on the exemptchanops list", word.c_str()));
 	}
 
 	void TellNotSet(User* user, Channel* chan, std::string &word)
 	{
-		user->WriteNumeric(958, "%s :No such exemptchanops word is set", chan->name.c_str());
+		user->WriteNumeric(958, chan->name, "No such exemptchanops word is set");
 	}
 };
 
diff --git a/src/modules/m_filter.cpp b/src/modules/m_filter.cpp
index 34d0bebb3..bd1022a08 100644
--- a/src/modules/m_filter.cpp
+++ b/src/modules/m_filter.cpp
@@ -343,14 +343,14 @@ ModResult ModuleFilter::OnUserPreMessage(User* user, void* dest, int target_type
 		{
 			ServerInstance->SNO->WriteGlobalSno('a', "FILTER: "+user->nick+" had their message filtered, target was "+target+": "+f->reason);
 			if (target_type == TYPE_CHANNEL)
-				user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :Message to channel blocked and opers notified (%s)", target.c_str(), f->reason.c_str());
+				user->WriteNumeric(ERR_CANNOTSENDTOCHAN, target, InspIRCd::Format("Message to channel blocked and opers notified (%s)", f->reason.c_str()));
 			else
 				user->WriteNotice("Your message to "+target+" was blocked and opers notified: "+f->reason);
 		}
 		else if (f->action == FA_SILENT)
 		{
 			if (target_type == TYPE_CHANNEL)
-				user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :Message to channel blocked (%s)", target.c_str(), f->reason.c_str());
+				user->WriteNumeric(ERR_CANNOTSENDTOCHAN, target, InspIRCd::Format("Message to channel blocked (%s)", f->reason.c_str()));
 			else
 				user->WriteNotice("Your message to "+target+" was blocked: "+f->reason);
 		}
diff --git a/src/modules/m_globalload.cpp b/src/modules/m_globalload.cpp
index 294187fa5..2355cc979 100644
--- a/src/modules/m_globalload.cpp
+++ b/src/modules/m_globalload.cpp
@@ -44,11 +44,11 @@ class CommandGloadmodule : public Command
 			if (ServerInstance->Modules->Load(parameters[0].c_str()))
 			{
 				ServerInstance->SNO->WriteToSnoMask('a', "NEW MODULE '%s' GLOBALLY LOADED BY '%s'",parameters[0].c_str(), user->nick.c_str());
-				user->WriteNumeric(RPL_LOADEDMODULE, "%s :Module successfully loaded.", parameters[0].c_str());
+				user->WriteNumeric(RPL_LOADEDMODULE, parameters[0], "Module successfully loaded.");
 			}
 			else
 			{
-				user->WriteNumeric(ERR_CANTLOADMODULE, "%s :%s", parameters[0].c_str(), ServerInstance->Modules->LastError().c_str());
+				user->WriteNumeric(ERR_CANTLOADMODULE, parameters[0], ServerInstance->Modules->LastError());
 			}
 		}
 		else
@@ -79,7 +79,7 @@ class CommandGunloadmodule : public Command
 		if (!ServerInstance->Config->ConfValue("security")->getBool("allowcoreunload") &&
 			InspIRCd::Match(parameters[0], "core_*.so", ascii_case_insensitive_map))
 		{
-			user->WriteNumeric(ERR_CANTUNLOADMODULE, "%s :You cannot unload core commands!", parameters[0].c_str());
+			user->WriteNumeric(ERR_CANTUNLOADMODULE, parameters[0], "You cannot unload core commands!");
 			return CMD_FAILURE;
 		}
 
@@ -98,7 +98,7 @@ class CommandGunloadmodule : public Command
 				}
 				else
 				{
-					user->WriteNumeric(ERR_CANTUNLOADMODULE, "%s :%s", parameters[0].c_str(), ServerInstance->Modules->LastError().c_str());
+					user->WriteNumeric(ERR_CANTUNLOADMODULE, parameters[0], ServerInstance->Modules->LastError());
 				}
 			}
 			else
@@ -140,7 +140,7 @@ class CommandGreloadmodule : public Command
 			}
 			else
 			{
-				user->WriteNumeric(RPL_LOADEDMODULE, "%s :Could not find module by that name", parameters[0].c_str());
+				user->WriteNumeric(RPL_LOADEDMODULE, parameters[0], "Could not find module by that name");
 				return CMD_FAILURE;
 			}
 		}
diff --git a/src/modules/m_helpop.cpp b/src/modules/m_helpop.cpp
index ef9ae5e22..f567aa076 100644
--- a/src/modules/m_helpop.cpp
+++ b/src/modules/m_helpop.cpp
@@ -57,15 +57,15 @@ class CommandHelpop : public Command
 		if (parameter == "index")
 		{
 			/* iterate over all helpop items */
-			user->WriteNumeric(290, ":HELPOP topic index");
+			user->WriteNumeric(290, "HELPOP topic index");
 			for (HelpopMap::const_iterator iter = helpop_map.begin(); iter != helpop_map.end(); iter++)
-				user->WriteNumeric(292, ":  %s", iter->first.c_str());
-			user->WriteNumeric(292, ":*** End of HELPOP topic index");
+				user->WriteNumeric(292, InspIRCd::Format("  %s", iter->first.c_str()));
+			user->WriteNumeric(292, "*** End of HELPOP topic index");
 		}
 		else
 		{
-			user->WriteNumeric(290, ":*** HELPOP for %s", parameter.c_str());
-			user->WriteNumeric(292, ": -");
+			user->WriteNumeric(290, InspIRCd::Format("*** HELPOP for %s", parameter.c_str()));
+			user->WriteNumeric(292, " -");
 
 			HelpopMap::const_iterator iter = helpop_map.find(parameter);
 
@@ -82,13 +82,13 @@ class CommandHelpop : public Command
 			{
 				// Writing a blank line will not work with some clients
 				if (token.empty())
-					user->WriteNumeric(292, ": ");
+					user->WriteNumeric(292, ' ');
 				else
-					user->WriteNumeric(292, ":%s", token.c_str());
+					user->WriteNumeric(292, token);
 			}
 
-			user->WriteNumeric(292, ": -");
-			user->WriteNumeric(292, ":*** End of HELPOP");
+			user->WriteNumeric(292, " -");
+			user->WriteNumeric(292, "*** End of HELPOP");
 		}
 		return CMD_SUCCESS;
 	}
diff --git a/src/modules/m_hidelist.cpp b/src/modules/m_hidelist.cpp
index cde8371fc..97173c14b 100644
--- a/src/modules/m_hidelist.cpp
+++ b/src/modules/m_hidelist.cpp
@@ -46,7 +46,7 @@ class ListWatcher : public ModeWatcher
 		if (user->HasPrivPermission("channels/auspex"))
 			return true;
 
-		user->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You do not have access to view the %s list", chan->name.c_str(), GetModeName().c_str());
+		user->WriteNumeric(ERR_CHANOPRIVSNEEDED, chan->name, InspIRCd::Format("You do not have access to view the %s list", GetModeName().c_str()));
 		return false;
 	}
 };
diff --git a/src/modules/m_hideoper.cpp b/src/modules/m_hideoper.cpp
index 03f6745ee..b90f3f234 100644
--- a/src/modules/m_hideoper.cpp
+++ b/src/modules/m_hideoper.cpp
@@ -71,9 +71,9 @@ class ModuleHideOper : public Module, public Whois::LineEventListener
 			hm.opercount--;
 	}
 
-	ModResult OnNumeric(User* user, unsigned int numeric, const std::string& text) CXX11_OVERRIDE
+	ModResult OnNumeric(User* user, const Numeric::Numeric& numeric) CXX11_OVERRIDE
 	{
-		if (numeric != 252 || active || user->HasPrivPermission("users/auspex"))
+		if (numeric.GetNumeric() != 252 || active || user->HasPrivPermission("users/auspex"))
 			return MOD_RES_PASSTHRU;
 
 		// If there are no visible operators then we shouldn't send the numeric.
@@ -81,7 +81,7 @@ class ModuleHideOper : public Module, public Whois::LineEventListener
 		if (opercount)
 		{
 			active = true;
-			user->WriteNumeric(252, "%lu :operator(s) online", opercount);
+			user->WriteNumeric(252, opercount, "operator(s) online");
 			active = false;
 		}
 		return MOD_RES_DENY;
diff --git a/src/modules/m_httpd_stats.cpp b/src/modules/m_httpd_stats.cpp
index 541e080f5..eb8e856ac 100644
--- a/src/modules/m_httpd_stats.cpp
+++ b/src/modules/m_httpd_stats.cpp
@@ -109,10 +109,12 @@ class ModuleHttpStats : public Module, public HTTPRequestEventListener
 				data << "<uptime><boot_time_t>" << ServerInstance->startup_time << "</boot_time_t></uptime>";
 
 				data << "<isupport>";
-				const std::vector<std::string>& isupport = ServerInstance->ISupport.GetLines();
-				for (std::vector<std::string>::const_iterator it = isupport.begin(); it != isupport.end(); it++)
+				const std::vector<Numeric::Numeric>& isupport = ServerInstance->ISupport.GetLines();
+				for (std::vector<Numeric::Numeric>::const_iterator i = isupport.begin(); i != isupport.end(); ++i)
 				{
-					data << Sanitize(*it) << std::endl;
+					const Numeric::Numeric& num = *i;
+					for (std::vector<std::string>::const_iterator j = num.GetParams().begin(); j != num.GetParams().end()-1; ++j)
+						data << "<token>" << Sanitize(*j) << "</token>" << std::endl;
 				}
 				data << "</isupport></general><xlines>";
 				std::vector<std::string> xltypes = ServerInstance->XLines->GetAllTypes();
diff --git a/src/modules/m_joinflood.cpp b/src/modules/m_joinflood.cpp
index 52802f168..56e109c1a 100644
--- a/src/modules/m_joinflood.cpp
+++ b/src/modules/m_joinflood.cpp
@@ -95,7 +95,7 @@ class JoinFlood : public ParamMode<JoinFlood, SimpleExtItem<joinfloodsettings> >
 		std::string::size_type colon = parameter.find(':');
 		if ((colon == std::string::npos) || (parameter.find('-') != std::string::npos))
 		{
-			source->WriteNumeric(608, "%s :Invalid flood parameter",channel->name.c_str());
+			source->WriteNumeric(608, channel->name, "Invalid flood parameter");
 			return MODEACTION_DENY;
 		}
 
@@ -104,7 +104,7 @@ class JoinFlood : public ParamMode<JoinFlood, SimpleExtItem<joinfloodsettings> >
 		unsigned int nsecs = ConvToInt(parameter.substr(colon+1));
 		if ((njoins<1) || (nsecs<1))
 		{
-			source->WriteNumeric(608, "%s :Invalid flood parameter",channel->name.c_str());
+			source->WriteNumeric(608, channel->name, "Invalid flood parameter");
 			return MODEACTION_DENY;
 		}
 
@@ -136,7 +136,7 @@ class ModuleJoinFlood : public Module
 			joinfloodsettings *f = jf.ext.get(chan);
 			if (f && f->islocked())
 			{
-				user->WriteNumeric(609, "%s :This channel is temporarily unavailable (+j). Please try again later.",chan->name.c_str());
+				user->WriteNumeric(609, chan->name, "This channel is temporarily unavailable (+j). Please try again later.");
 				return MOD_RES_DENY;
 			}
 		}
diff --git a/src/modules/m_jumpserver.cpp b/src/modules/m_jumpserver.cpp
index e9c07f45f..33b9bcd35 100644
--- a/src/modules/m_jumpserver.cpp
+++ b/src/modules/m_jumpserver.cpp
@@ -116,7 +116,7 @@ class CommandJumpserver : public Command
 					++i;
 					if (!t->IsOper())
 					{
-						t->WriteNumeric(RPL_REDIR, "%s %d :Please use this Server/Port instead", parameters[0].c_str(), GetPort(t));
+						t->WriteNumeric(RPL_REDIR, parameters[0], GetPort(t), "Please use this Server/Port instead");
 						ServerInstance->Users->QuitUser(t, reason);
 						n_done++;
 					}
@@ -160,8 +160,7 @@ class ModuleJumpServer : public Module
 		if (js.redirect_new_users)
 		{
 			int port = js.GetPort(user);
-			user->WriteNumeric(RPL_REDIR, "%s %d :Please use this Server/Port instead",
-				js.redirect_to.c_str(), port);
+			user->WriteNumeric(RPL_REDIR, js.redirect_to, port, "Please use this Server/Port instead");
 			ServerInstance->Users->QuitUser(user, js.reason);
 			return MOD_RES_PASSTHRU;
 		}
diff --git a/src/modules/m_kicknorejoin.cpp b/src/modules/m_kicknorejoin.cpp
index b8a776667..ad8bfdcb6 100644
--- a/src/modules/m_kicknorejoin.cpp
+++ b/src/modules/m_kicknorejoin.cpp
@@ -132,7 +132,7 @@ public:
 			const KickRejoinData* data = kr.ext.get(chan);
 			if ((data) && (!data->canjoin(user)))
 			{
-				user->WriteNumeric(ERR_DELAYREJOIN, "%s :You must wait %u seconds after being kicked to rejoin (+J)", chan->name.c_str(), data->delay);
+				user->WriteNumeric(ERR_DELAYREJOIN, chan, InspIRCd::Format("You must wait %u seconds after being kicked to rejoin (+J)", data->delay));
 				return MOD_RES_DENY;
 			}
 		}
diff --git a/src/modules/m_knock.cpp b/src/modules/m_knock.cpp
index 26397bc9c..545c2dc14 100644
--- a/src/modules/m_knock.cpp
+++ b/src/modules/m_knock.cpp
@@ -45,25 +45,25 @@ class CommandKnock : public Command
 		Channel* c = ServerInstance->FindChan(parameters[0]);
 		if (!c)
 		{
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such channel", parameters[0].c_str());
+			user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 			return CMD_FAILURE;
 		}
 
 		if (c->HasUser(user))
 		{
-			user->WriteNumeric(ERR_KNOCKONCHAN, "%s :Can't KNOCK on %s, you are already on that channel.", c->name.c_str(), c->name.c_str());
+			user->WriteNumeric(ERR_KNOCKONCHAN, c->name, InspIRCd::Format("Can't KNOCK on %s, you are already on that channel.", c->name.c_str()));
 			return CMD_FAILURE;
 		}
 
 		if (c->IsModeSet(noknockmode))
 		{
-			user->WriteNumeric(480, ":Can't KNOCK on %s, +K is set.", c->name.c_str());
+			user->WriteNumeric(480, InspIRCd::Format("Can't KNOCK on %s, +K is set.", c->name.c_str()));
 			return CMD_FAILURE;
 		}
 
 		if (!c->IsModeSet(inviteonlymode))
 		{
-			user->WriteNumeric(ERR_CHANOPEN, "%s :Can't KNOCK on %s, channel is not invite only so knocking is pointless!", c->name.c_str(), c->name.c_str());
+			user->WriteNumeric(ERR_CHANOPEN, c->name, InspIRCd::Format("Can't KNOCK on %s, channel is not invite only so knocking is pointless!", c->name.c_str()));
 			return CMD_FAILURE;
 		}
 
diff --git a/src/modules/m_lockserv.cpp b/src/modules/m_lockserv.cpp
index 65b9aa036..ffcc04682 100644
--- a/src/modules/m_lockserv.cpp
+++ b/src/modules/m_lockserv.cpp
@@ -44,7 +44,7 @@ class CommandLockserv : public Command
 		}
 
 		locked = true;
-		user->WriteNumeric(988, "%s :Closed for new connections", user->server->GetName().c_str());
+		user->WriteNumeric(988, user->server->GetName(), "Closed for new connections");
 		ServerInstance->SNO->WriteGlobalSno('a', "Oper %s used LOCKSERV to temporarily disallow new connections", user->nick.c_str());
 		return CMD_SUCCESS;
 	}
@@ -69,7 +69,7 @@ class CommandUnlockserv : public Command
 		}
 
 		locked = false;
-		user->WriteNumeric(989, "%s :Open for new connections", user->server->GetName().c_str());
+		user->WriteNumeric(989, user->server->GetName(), "Open for new connections");
 		ServerInstance->SNO->WriteGlobalSno('a', "Oper %s used UNLOCKSERV to allow new connections", user->nick.c_str());
 		return CMD_SUCCESS;
 	}
diff --git a/src/modules/m_messageflood.cpp b/src/modules/m_messageflood.cpp
index 1faf3bfb9..c5c872169 100644
--- a/src/modules/m_messageflood.cpp
+++ b/src/modules/m_messageflood.cpp
@@ -73,7 +73,7 @@ class MsgFlood : public ParamMode<MsgFlood, SimpleExtItem<floodsettings> >
 		std::string::size_type colon = parameter.find(':');
 		if ((colon == std::string::npos) || (parameter.find('-') != std::string::npos))
 		{
-			source->WriteNumeric(608, "%s :Invalid flood parameter", channel->name.c_str());
+			source->WriteNumeric(608, channel->name, "Invalid flood parameter");
 			return MODEACTION_DENY;
 		}
 
@@ -84,7 +84,7 @@ class MsgFlood : public ParamMode<MsgFlood, SimpleExtItem<floodsettings> >
 
 		if ((nlines<2) || (nsecs<1))
 		{
-			source->WriteNumeric(608, "%s :Invalid flood parameter", channel->name.c_str());
+			source->WriteNumeric(608, channel->name, "Invalid flood parameter");
 			return MODEACTION_DENY;
 		}
 
diff --git a/src/modules/m_mlock.cpp b/src/modules/m_mlock.cpp
index 9b0fa8dab..d3ab5b9fd 100644
--- a/src/modules/m_mlock.cpp
+++ b/src/modules/m_mlock.cpp
@@ -50,8 +50,7 @@ class ModuleMLock : public Module
 		std::string::size_type p = mlock_str->find(mode);
 		if (p != std::string::npos)
 		{
-			source->WriteNumeric(742, "%s %c %s :MODE cannot be set due to channel having an active MLOCK restriction policy",
-					     channel->name.c_str(), mode, mlock_str->c_str());
+			source->WriteNumeric(742, channel->name, mode, *mlock_str, "MODE cannot be set due to channel having an active MLOCK restriction policy");
 			return MOD_RES_DENY;
 		}
 
diff --git a/src/modules/m_monitor.cpp b/src/modules/m_monitor.cpp
index 139c70e76..b2e06f191 100644
--- a/src/modules/m_monitor.cpp
+++ b/src/modules/m_monitor.cpp
@@ -285,7 +285,7 @@ class CommandMonitor : public SplitCommand
 			if (result == IRCv3::Monitor::Manager::WR_TOOMANY)
 			{
 				// List is full, send error which includes the remaining nicks that were not processed
-				user->WriteNumeric(ERR_MONLISTFULL, "%u %s%s%s :Monitor list is full", maxmonitor, nick.c_str(), (ss.StreamEnd() ? "" : ","), ss.GetRemaining().c_str());
+				user->WriteNumeric(ERR_MONLISTFULL, maxmonitor, InspIRCd::Format("%s%s%s", nick.c_str(), (ss.StreamEnd() ? "" : ","), ss.GetRemaining().c_str()), "Monitor list is full");
 				break;
 			}
 			else if (result != IRCv3::Monitor::Manager::WR_OK)
@@ -346,7 +346,7 @@ class CommandMonitor : public SplitCommand
 				out.Add(entry->GetNick());
 			}
 			out.Flush();
-			user->WriteNumeric(RPL_ENDOFMONLIST, ":End of MONITOR list");
+			user->WriteNumeric(RPL_ENDOFMONLIST, "End of MONITOR list");
 		}
 		else if (subcmd == 'S')
 		{
diff --git a/src/modules/m_muteban.cpp b/src/modules/m_muteban.cpp
index 72c4acd47..c9caf6a6a 100644
--- a/src/modules/m_muteban.cpp
+++ b/src/modules/m_muteban.cpp
@@ -36,7 +36,7 @@ class ModuleQuietBan : public Module
 		Channel* chan = static_cast<Channel*>(dest);
 		if (chan->GetExtBanStatus(user, 'm') == MOD_RES_DENY && chan->GetPrefixValue(user) < VOICE_VALUE)
 		{
-			user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :Cannot send to channel (you're muted)", chan->name.c_str());
+			user->WriteNumeric(ERR_CANNOTSENDTOCHAN, chan->name, "Cannot send to channel (you're muted)");
 			return MOD_RES_DENY;
 		}
 
diff --git a/src/modules/m_namedmodes.cpp b/src/modules/m_namedmodes.cpp
index 617ee43b3..10bef981a 100644
--- a/src/modules/m_namedmodes.cpp
+++ b/src/modules/m_namedmodes.cpp
@@ -39,7 +39,7 @@ static void DisplayList(User* user, Channel* channel)
 	}
 	const std::string line = ":" + ServerInstance->Config->ServerName + " 961 " + user->nick + " " + channel->name;
 	user->SendText(line, items);
-	user->WriteNumeric(960, "%s :End of mode list", channel->name.c_str());
+	user->WriteNumeric(960, channel->name, "End of mode list");
 }
 
 class CommandProp : public Command
@@ -55,7 +55,7 @@ class CommandProp : public Command
 		Channel* const chan = ServerInstance->FindChan(parameters[0]);
 		if (!chan)
 		{
-			src->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+			src->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 			return CMD_FAILURE;
 		}
 
diff --git a/src/modules/m_nickflood.cpp b/src/modules/m_nickflood.cpp
index cade0b1db..0af1041f9 100644
--- a/src/modules/m_nickflood.cpp
+++ b/src/modules/m_nickflood.cpp
@@ -91,7 +91,7 @@ class NickFlood : public ParamMode<NickFlood, SimpleExtItem<nickfloodsettings> >
 		std::string::size_type colon = parameter.find(':');
 		if ((colon == std::string::npos) || (parameter.find('-') != std::string::npos))
 		{
-			source->WriteNumeric(608, "%s :Invalid flood parameter",channel->name.c_str());
+			source->WriteNumeric(608, channel->name, "Invalid flood parameter");
 			return MODEACTION_DENY;
 		}
 
@@ -101,7 +101,7 @@ class NickFlood : public ParamMode<NickFlood, SimpleExtItem<nickfloodsettings> >
 
 		if ((nnicks<1) || (nsecs<1))
 		{
-			source->WriteNumeric(608, "%s :Invalid flood parameter",channel->name.c_str());
+			source->WriteNumeric(608, channel->name, "Invalid flood parameter");
 			return MODEACTION_DENY;
 		}
 
@@ -142,7 +142,7 @@ class ModuleNickFlood : public Module
 
 				if (f->islocked())
 				{
-					user->WriteNumeric(ERR_CANTCHANGENICK, ":%s has been locked for nickchanges for 60 seconds because there have been more than %u nick changes in %u seconds", channel->name.c_str(), f->nicks, f->secs);
+					user->WriteNumeric(ERR_CANTCHANGENICK, InspIRCd::Format("%s has been locked for nickchanges for 60 seconds because there have been more than %u nick changes in %u seconds", channel->name.c_str(), f->nicks, f->secs));
 					return MOD_RES_DENY;
 				}
 
diff --git a/src/modules/m_nicklock.cpp b/src/modules/m_nicklock.cpp
index a99628bf1..634982d14 100644
--- a/src/modules/m_nicklock.cpp
+++ b/src/modules/m_nicklock.cpp
@@ -55,7 +55,7 @@ class CommandNicklock : public Command
 				return CMD_FAILURE;
 			}
 
-			user->WriteNumeric(947, "%s :Nickname now locked.", parameters[1].c_str());
+			user->WriteNumeric(947, parameters[1], "Nickname now locked.");
 		}
 
 		/* If we made it this far, extend the user */
@@ -159,7 +159,7 @@ class ModuleNickLock : public Module
 	{
 		if (locked.get(user))
 		{
-			user->WriteNumeric(ERR_CANTCHANGENICK, ":You cannot change your nickname (your nick is locked)");
+			user->WriteNumeric(ERR_CANTCHANGENICK, "You cannot change your nickname (your nick is locked)");
 			return MOD_RES_DENY;
 		}
 		return MOD_RES_PASSTHRU;
diff --git a/src/modules/m_noctcp.cpp b/src/modules/m_noctcp.cpp
index 953557d90..49b53ee95 100644
--- a/src/modules/m_noctcp.cpp
+++ b/src/modules/m_noctcp.cpp
@@ -56,7 +56,7 @@ class ModuleNoCTCP : public Module
 
 			if (!c->GetExtBanStatus(user, 'C').check(!c->IsModeSet(nc)))
 			{
-				user->WriteNumeric(ERR_NOCTCPALLOWED, "%s :Can't send CTCP to channel (+C set)", c->name.c_str());
+				user->WriteNumeric(ERR_NOCTCPALLOWED, c->name, "Can't send CTCP to channel (+C set)");
 				return MOD_RES_DENY;
 			}
 		}
diff --git a/src/modules/m_nokicks.cpp b/src/modules/m_nokicks.cpp
index 0acf84118..fb3455567 100644
--- a/src/modules/m_nokicks.cpp
+++ b/src/modules/m_nokicks.cpp
@@ -48,7 +48,7 @@ class ModuleNoKicks : public Module
 		if (!memb->chan->GetExtBanStatus(source, 'Q').check(!memb->chan->IsModeSet(nk)))
 		{
 			// Can't kick with Q in place, not even opers with override, and founders
-			source->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :Can't kick user %s from channel (+Q set)", memb->chan->name.c_str(), memb->user->nick.c_str());
+			source->WriteNumeric(ERR_CHANOPRIVSNEEDED, memb->chan->name, InspIRCd::Format("Can't kick user %s from channel (+Q set)", memb->user->nick.c_str()));
 			return MOD_RES_DENY;
 		}
 		return MOD_RES_PASSTHRU;
diff --git a/src/modules/m_nonicks.cpp b/src/modules/m_nonicks.cpp
index 63815f2bf..d4da3e951 100644
--- a/src/modules/m_nonicks.cpp
+++ b/src/modules/m_nonicks.cpp
@@ -62,8 +62,8 @@ class ModuleNoNickChange : public Module
 
 			if (!curr->GetExtBanStatus(user, 'N').check(!curr->IsModeSet(nn)))
 			{
-				user->WriteNumeric(ERR_CANTCHANGENICK, ":Can't change nickname while on %s (+N is set)",
-					curr->name.c_str());
+				user->WriteNumeric(ERR_CANTCHANGENICK, InspIRCd::Format("Can't change nickname while on %s (+N is set)",
+					curr->name.c_str()));
 				return MOD_RES_DENY;
 			}
 		}
diff --git a/src/modules/m_nonotice.cpp b/src/modules/m_nonotice.cpp
index cab367ad9..3d6d0bb09 100644
--- a/src/modules/m_nonotice.cpp
+++ b/src/modules/m_nonotice.cpp
@@ -55,7 +55,7 @@ class ModuleNoNotice : public Module
 					return MOD_RES_PASSTHRU;
 				else
 				{
-					user->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :Can't send NOTICE to channel (+T set)", c->name.c_str());
+					user->WriteNumeric(ERR_CANNOTSENDTOCHAN, c->name, "Can't send NOTICE to channel (+T set)");
 					return MOD_RES_DENY;
 				}
 			}
diff --git a/src/modules/m_ojoin.cpp b/src/modules/m_ojoin.cpp
index 1444f93ad..88b63bef2 100644
--- a/src/modules/m_ojoin.cpp
+++ b/src/modules/m_ojoin.cpp
@@ -146,7 +146,7 @@ class ModuleOjoin : public Module
 		if (source == memb->user)
 			return MOD_RES_PASSTHRU;
 
-		source->WriteNumeric(ERR_RESTRICTED, memb->chan->name+" :Can't kick "+memb->user->nick+" as they're on official network business.");
+		source->WriteNumeric(ERR_RESTRICTED, memb->chan->name, "Can't kick "+memb->user->nick+" as they're on official network business.");
 		return MOD_RES_DENY;
 	}
 
diff --git a/src/modules/m_operchans.cpp b/src/modules/m_operchans.cpp
index 3c6b4cd59..0b074ebab 100644
--- a/src/modules/m_operchans.cpp
+++ b/src/modules/m_operchans.cpp
@@ -44,8 +44,7 @@ class ModuleOperChans : public Module
 	{
 		if (chan && chan->IsModeSet(oc) && !user->IsOper())
 		{
-			user->WriteNumeric(ERR_CANTJOINOPERSONLY, "%s :Only IRC operators may join %s (+O is set)",
-				chan->name.c_str(), chan->name.c_str());
+			user->WriteNumeric(ERR_CANTJOINOPERSONLY, chan->name, InspIRCd::Format("Only IRC operators may join %s (+O is set)", chan->name.c_str()));
 			return MOD_RES_DENY;
 		}
 		return MOD_RES_PASSTHRU;
diff --git a/src/modules/m_operlevels.cpp b/src/modules/m_operlevels.cpp
index ac7178a93..bf758b1f7 100644
--- a/src/modules/m_operlevels.cpp
+++ b/src/modules/m_operlevels.cpp
@@ -44,7 +44,7 @@ class ModuleOperLevels : public Module
 				{
 					if (IS_LOCAL(source)) ServerInstance->SNO->WriteGlobalSno('a', "Oper %s (level %ld) attempted to /kill a higher oper: %s (level %ld): Reason: %s",source->nick.c_str(),source_level,dest->nick.c_str(),dest_level,reason.c_str());
 					dest->WriteNotice("*** Oper " + source->nick + " attempted to /kill you!");
-					source->WriteNumeric(ERR_NOPRIVILEGES, ":Permission Denied - Oper %s is a higher level than you", dest->nick.c_str());
+					source->WriteNumeric(ERR_NOPRIVILEGES, InspIRCd::Format("Permission Denied - Oper %s is a higher level than you", dest->nick.c_str()));
 					return MOD_RES_DENY;
 				}
 			}
diff --git a/src/modules/m_redirect.cpp b/src/modules/m_redirect.cpp
index e822676bf..b14de9ff9 100644
--- a/src/modules/m_redirect.cpp
+++ b/src/modules/m_redirect.cpp
@@ -38,7 +38,7 @@ class Redirect : public ParamMode<Redirect, LocalStringExt>
 		{
 			if (!ServerInstance->IsChannel(parameter))
 			{
-				source->WriteNumeric(ERR_NOSUCHCHANNEL, "%s :Invalid channel name", parameter.c_str());
+				source->WriteNumeric(ERR_NOSUCHCHANNEL, parameter, "Invalid channel name");
 				return MODEACTION_DENY;
 			}
 		}
@@ -48,12 +48,12 @@ class Redirect : public ParamMode<Redirect, LocalStringExt>
 			Channel* c = ServerInstance->FindChan(parameter);
 			if (!c)
 			{
-				source->WriteNumeric(690, ":Target channel %s must exist to be set as a redirect.",parameter.c_str());
+				source->WriteNumeric(690, InspIRCd::Format("Target channel %s must exist to be set as a redirect.", parameter.c_str()));
 				return MODEACTION_DENY;
 			}
 			else if (c->GetPrefixValue(source) < OP_VALUE)
 			{
-				source->WriteNumeric(690, ":You must be opped on %s to set it as a redirect.",parameter.c_str());
+				source->WriteNumeric(690, InspIRCd::Format("You must be opped on %s to set it as a redirect.", parameter.c_str()));
 				return MODEACTION_DENY;
 			}
 		}
@@ -119,19 +119,19 @@ class ModuleRedirect : public Module
 					Channel* destchan = ServerInstance->FindChan(channel);
 					if (destchan && destchan->IsModeSet(re))
 					{
-						user->WriteNumeric(470, "%s * :You may not join this channel. A redirect is set, but you may not be redirected as it is a circular loop.", cname.c_str());
+						user->WriteNumeric(470, cname, '*', "You may not join this channel. A redirect is set, but you may not be redirected as it is a circular loop.");
 						return MOD_RES_DENY;
 					}
 					/* We check the bool value here to make sure we have it enabled, if we don't then
 						usermode +L might be assigned to something else. */
 					if (UseUsermode && user->IsModeSet(re_u))
 					{
-						user->WriteNumeric(470, "%s %s :Force redirection stopped.", cname.c_str(), channel.c_str());
+						user->WriteNumeric(470, cname, channel, "Force redirection stopped.");
 						return MOD_RES_DENY;
 					}
 					else
 					{
-						user->WriteNumeric(470, "%s %s :You may not join this channel, so you are automatically being transferred to the redirect channel.", cname.c_str(), channel.c_str());
+						user->WriteNumeric(470, cname, channel, "You may not join this channel, so you are automatically being transferred to the redirect channel.");
 						Channel::JoinUser(user, channel);
 						return MOD_RES_DENY;
 					}
diff --git a/src/modules/m_regonlycreate.cpp b/src/modules/m_regonlycreate.cpp
index 0ffe5e085..78b20ef6b 100644
--- a/src/modules/m_regonlycreate.cpp
+++ b/src/modules/m_regonlycreate.cpp
@@ -49,7 +49,7 @@ class ModuleRegOnlyCreate : public Module
 			return MOD_RES_PASSTHRU;
 
 		// XXX. there may be a better numeric for this..
-		user->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You must have a registered nickname to create a new channel", cname.c_str());
+		user->WriteNumeric(ERR_CHANOPRIVSNEEDED, cname, "You must have a registered nickname to create a new channel");
 		return MOD_RES_DENY;
 	}
 
diff --git a/src/modules/m_remove.cpp b/src/modules/m_remove.cpp
index 8d0009d71..5b0efe2a2 100644
--- a/src/modules/m_remove.cpp
+++ b/src/modules/m_remove.cpp
@@ -76,7 +76,7 @@ class RemoveBase : public Command
 		/* Fix by brain - someone needs to learn to validate their input! */
 		if ((!target) || (target->registered != REG_ALL) || (!channel))
 		{
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", !channel ? channame.c_str() : username.c_str());
+			user->WriteNumeric(Numerics::NoSuchNick(channel ? username.c_str() : channame.c_str()));
 			return CMD_FAILURE;
 		}
 
@@ -88,7 +88,7 @@ class RemoveBase : public Command
 
 		if (target->server->IsULine())
 		{
-			user->WriteNumeric(482, "%s :Only a u-line may remove a u-line from a channel.", channame.c_str());
+			user->WriteNumeric(482, channame, "Only a u-line may remove a u-line from a channel.");
 			return CMD_FAILURE;
 		}
 
@@ -144,7 +144,7 @@ class RemoveBase : public Command
 		else
 		{
 			/* m_nokicks.so was loaded and +Q was set, block! */
-			user->WriteNumeric(ERR_RESTRICTED, "%s :Can't remove user %s from channel (nokicks mode is set)", channel->name.c_str(), target->nick.c_str());
+			user->WriteNumeric(ERR_RESTRICTED, channel->name, InspIRCd::Format("Can't remove user %s from channel (nokicks mode is set)", target->nick.c_str()));
 			return CMD_FAILURE;
 		}
 
diff --git a/src/modules/m_restrictchans.cpp b/src/modules/m_restrictchans.cpp
index 9e660e8ed..9c7ed1213 100644
--- a/src/modules/m_restrictchans.cpp
+++ b/src/modules/m_restrictchans.cpp
@@ -47,7 +47,7 @@ class ModuleRestrictChans : public Module
 			// user is not an oper and its not in the allow list
 			if ((!user->IsOper()) && (allowchans.find(cname) == allowchans.end()))
 			{
-				user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s :Only IRC operators may create new channels", cname.c_str());
+				user->WriteNumeric(ERR_BANNEDFROMCHAN, cname, "Only IRC operators may create new channels");
 				return MOD_RES_DENY;
 			}
 		}
diff --git a/src/modules/m_restrictmsg.cpp b/src/modules/m_restrictmsg.cpp
index 279775d48..8ca531ed5 100644
--- a/src/modules/m_restrictmsg.cpp
+++ b/src/modules/m_restrictmsg.cpp
@@ -39,7 +39,7 @@ class ModuleRestrictMsg : public Module
 			{
 				return MOD_RES_PASSTHRU;
 			}
-			user->WriteNumeric(ERR_CANTSENDTOUSER, "%s :You are not permitted to send private messages to this user", u->nick.c_str());
+			user->WriteNumeric(ERR_CANTSENDTOUSER, u->nick, "You are not permitted to send private messages to this user");
 			return MOD_RES_DENY;
 		}
 
diff --git a/src/modules/m_sajoin.cpp b/src/modules/m_sajoin.cpp
index d1321947b..9696b08a1 100644
--- a/src/modules/m_sajoin.cpp
+++ b/src/modules/m_sajoin.cpp
@@ -53,7 +53,7 @@ class CommandSajoin : public Command
 
 			if (dest->server->IsULine())
 			{
-				user->WriteNumeric(ERR_NOPRIVILEGES, ":Cannot use an SA command on a u-lined client");
+				user->WriteNumeric(ERR_NOPRIVILEGES, "Cannot use an SA command on a u-lined client");
 				return CMD_FAILURE;
 			}
 			if (IS_LOCAL(user) && !ServerInstance->IsChannel(channel))
diff --git a/src/modules/m_sakick.cpp b/src/modules/m_sakick.cpp
index 911b826dc..8fc6e741b 100644
--- a/src/modules/m_sakick.cpp
+++ b/src/modules/m_sakick.cpp
@@ -42,7 +42,7 @@ class CommandSakick : public Command
 
 			if (dest->server->IsULine())
 			{
-				user->WriteNumeric(ERR_NOPRIVILEGES, ":Cannot use an SA command on a u-lined client");
+				user->WriteNumeric(ERR_NOPRIVILEGES, "Cannot use an SA command on a u-lined client");
 				return CMD_FAILURE;
 			}
 
diff --git a/src/modules/m_samode.cpp b/src/modules/m_samode.cpp
index 8b06118ee..bcb876d5b 100644
--- a/src/modules/m_samode.cpp
+++ b/src/modules/m_samode.cpp
@@ -42,7 +42,7 @@ class CommandSamode : public Command
 			User* target = ServerInstance->FindNickOnly(parameters[0]);
 			if ((!target) || (target->registered != REG_ALL))
 			{
-				user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+				user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 				return CMD_FAILURE;
 			}
 
diff --git a/src/modules/m_sanick.cpp b/src/modules/m_sanick.cpp
index ba265fddd..fd9a825dd 100644
--- a/src/modules/m_sanick.cpp
+++ b/src/modules/m_sanick.cpp
@@ -42,7 +42,7 @@ class CommandSanick : public Command
 		{
 			if (target && target->server->IsULine())
 			{
-				user->WriteNumeric(ERR_NOPRIVILEGES, ":Cannot use an SA command on a u-lined client");
+				user->WriteNumeric(ERR_NOPRIVILEGES, "Cannot use an SA command on a u-lined client");
 				return CMD_FAILURE;
 			}
 
diff --git a/src/modules/m_sapart.cpp b/src/modules/m_sapart.cpp
index 730bf0823..65c32cd8a 100644
--- a/src/modules/m_sapart.cpp
+++ b/src/modules/m_sapart.cpp
@@ -48,7 +48,7 @@ class CommandSapart : public Command
 
 			if (dest->server->IsULine())
 			{
-				user->WriteNumeric(ERR_NOPRIVILEGES, ":Cannot use an SA command on a u-lined client");
+				user->WriteNumeric(ERR_NOPRIVILEGES, "Cannot use an SA command on a u-lined client");
 				return CMD_FAILURE;
 			}
 
diff --git a/src/modules/m_saquit.cpp b/src/modules/m_saquit.cpp
index fb1c67564..4d5ac6e22 100644
--- a/src/modules/m_saquit.cpp
+++ b/src/modules/m_saquit.cpp
@@ -39,7 +39,7 @@ class CommandSaquit : public Command
 		{
 			if (dest->server->IsULine())
 			{
-				user->WriteNumeric(ERR_NOPRIVILEGES, ":Cannot use an SA command on a u-lined client");
+				user->WriteNumeric(ERR_NOPRIVILEGES, "Cannot use an SA command on a u-lined client");
 				return CMD_FAILURE;
 			}
 
diff --git a/src/modules/m_sasl.cpp b/src/modules/m_sasl.cpp
index 6e3086930..e749d16b4 100644
--- a/src/modules/m_sasl.cpp
+++ b/src/modules/m_sasl.cpp
@@ -142,7 +142,7 @@ class SaslAuthenticator
 				this->result = this->GetSaslResult(msg[3]);
 			}
 			else if (msg[2] == "M")
-				this->user->WriteNumeric(908, "%s :are available SASL mechanisms", msg[3].c_str());
+				this->user->WriteNumeric(908, msg[3], "are available SASL mechanisms");
 			else
 				ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Services sent an unknown SASL message \"%s\" \"%s\"", msg[2].c_str(), msg[3].c_str());
 
@@ -194,13 +194,13 @@ class SaslAuthenticator
 		switch (this->result)
 		{
 		 case SASL_OK:
-			this->user->WriteNumeric(903, ":SASL authentication successful");
+			this->user->WriteNumeric(903, "SASL authentication successful");
 			break;
 	 	 case SASL_ABORT:
-			this->user->WriteNumeric(906, ":SASL authentication aborted");
+			this->user->WriteNumeric(906, "SASL authentication aborted");
 			break;
 		 case SASL_FAIL:
-			this->user->WriteNumeric(904, ":SASL authentication failed");
+			this->user->WriteNumeric(904, "SASL authentication failed");
 			break;
 		 default:
 			break;
diff --git a/src/modules/m_satopic.cpp b/src/modules/m_satopic.cpp
index 4a6f85536..040d86b9a 100644
--- a/src/modules/m_satopic.cpp
+++ b/src/modules/m_satopic.cpp
@@ -46,7 +46,7 @@ class CommandSATopic : public Command
 		}
 		else
 		{
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+			user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 			return CMD_FAILURE;
 		}
 	}
diff --git a/src/modules/m_securelist.cpp b/src/modules/m_securelist.cpp
index f4042b8f6..b6c6ce174 100644
--- a/src/modules/m_securelist.cpp
+++ b/src/modules/m_securelist.cpp
@@ -66,8 +66,8 @@ class ModuleSecureList : public Module
 			/* Some crap clients (read: mIRC, various java chat applets) muck up if they don't
 			 * receive these numerics whenever they send LIST, so give them an empty LIST to mull over.
 			 */
-			user->WriteNumeric(RPL_LISTSTART, "Channel :Users Name");
-			user->WriteNumeric(RPL_LISTEND, ":End of channel list.");
+			user->WriteNumeric(RPL_LISTSTART, "Channel", "Users Name");
+			user->WriteNumeric(RPL_LISTEND, "End of channel list.");
 			return MOD_RES_DENY;
 		}
 		return MOD_RES_PASSTHRU;
diff --git a/src/modules/m_services_account.cpp b/src/modules/m_services_account.cpp
index 48ab511f0..048e04a5a 100644
--- a/src/modules/m_services_account.cpp
+++ b/src/modules/m_services_account.cpp
@@ -46,7 +46,7 @@ class Channel_r : public ModeHandler
 		}
 		else
 		{
-			source->WriteNumeric(500, ":Only a server may modify the +r channel mode");
+			source->WriteNumeric(500, "Only a server may modify the +r channel mode");
 		}
 		return MODEACTION_DENY;
 	}
@@ -72,7 +72,7 @@ class User_r : public ModeHandler
 		}
 		else
 		{
-			source->WriteNumeric(500, ":Only a server may modify the +r user mode");
+			source->WriteNumeric(500, "Only a server may modify the +r user mode");
 		}
 		return MODEACTION_DENY;
 	}
@@ -128,8 +128,7 @@ class AccountExtItemImpl : public AccountExtItem
 			// Logged in
 			if (IS_LOCAL(user))
 			{
-				user->WriteNumeric(900, "%s %s :You are now logged in as %s",
-					user->GetFullHost().c_str(), value.c_str(), value.c_str());
+				user->WriteNumeric(900, user->GetFullHost(), value, InspIRCd::Format("You are now logged in as %s", value.c_str()));
 			}
 		}
 		// If value is empty then logged out
@@ -202,7 +201,7 @@ class ModuleServicesAccount : public Module, public Whois::EventListener
 			if (c->IsModeSet(m2) && !is_registered && res != MOD_RES_ALLOW)
 			{
 				// user messaging a +M channel and is not registered
-				user->WriteNumeric(477, c->name+" :You need to be identified to a registered account to message this channel");
+				user->WriteNumeric(477, c->name, "You need to be identified to a registered account to message this channel");
 				return MOD_RES_DENY;
 			}
 		}
@@ -213,7 +212,7 @@ class ModuleServicesAccount : public Module, public Whois::EventListener
 			if (u->IsModeSet(m3) && !is_registered)
 			{
 				// user messaging a +R user and is not registered
-				user->WriteNumeric(477, u->nick +" :You need to be identified to a registered account to message this user");
+				user->WriteNumeric(477, u->nick, "You need to be identified to a registered account to message this user");
 				return MOD_RES_DENY;
 			}
 		}
@@ -268,7 +267,7 @@ class ModuleServicesAccount : public Module, public Whois::EventListener
 				if (!is_registered)
 				{
 					// joining a +R channel and not identified
-					user->WriteNumeric(477, chan->name + " :You need to be identified to a registered account to join this channel");
+					user->WriteNumeric(477, chan->name, "You need to be identified to a registered account to join this channel");
 					return MOD_RES_DENY;
 				}
 			}
diff --git a/src/modules/m_servprotect.cpp b/src/modules/m_servprotect.cpp
index 0445235dc..34f730c62 100644
--- a/src/modules/m_servprotect.cpp
+++ b/src/modules/m_servprotect.cpp
@@ -86,7 +86,7 @@ class ModuleServProtectMode : public Module, public Whois::EventListener, public
 				if (u->IsModeSet(bm) && memb && memb->hasMode(mh->GetModeChar()))
 				{
 					/* BZZZT, Denied! */
-					user->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You are not permitted to remove privileges from %s services", chan->name.c_str(), ServerInstance->Config->Network.c_str());
+					user->WriteNumeric(ERR_CHANOPRIVSNEEDED, chan->name, InspIRCd::Format("You are not permitted to remove privileges from %s services", ServerInstance->Config->Network.c_str()));
 					return MOD_RES_DENY;
 				}
 			}
@@ -102,7 +102,7 @@ class ModuleServProtectMode : public Module, public Whois::EventListener, public
 
 		if (dst->IsModeSet(bm))
 		{
-			src->WriteNumeric(485, ":You are not permitted to kill %s services!", ServerInstance->Config->Network.c_str());
+			src->WriteNumeric(485, InspIRCd::Format("You are not permitted to kill %s services!", ServerInstance->Config->Network.c_str()));
 			ServerInstance->SNO->WriteGlobalSno('a', src->nick+" tried to kill service "+dst->nick+" ("+reason+")");
 			return MOD_RES_DENY;
 		}
@@ -113,8 +113,7 @@ class ModuleServProtectMode : public Module, public Whois::EventListener, public
 	{
 		if (memb->user->IsModeSet(bm))
 		{
-			src->WriteNumeric(ERR_RESTRICTED, "%s :You are not permitted to kick services",
-				memb->chan->name.c_str());
+			src->WriteNumeric(ERR_RESTRICTED, memb->chan->name, "You are not permitted to kick services");
 			return MOD_RES_DENY;
 		}
 
diff --git a/src/modules/m_setidle.cpp b/src/modules/m_setidle.cpp
index dd82aef29..4a15fd0d5 100644
--- a/src/modules/m_setidle.cpp
+++ b/src/modules/m_setidle.cpp
@@ -36,7 +36,7 @@ class CommandSetidle : public SplitCommand
 		int idle = InspIRCd::Duration(parameters[0]);
 		if (idle < 1)
 		{
-			user->WriteNumeric(948, ":Invalid idle time.");
+			user->WriteNumeric(948, "Invalid idle time.");
 			return CMD_FAILURE;
 		}
 		user->idle_lastmsg = (ServerInstance->Time() - idle);
@@ -44,7 +44,7 @@ class CommandSetidle : public SplitCommand
 		if (user->signon > user->idle_lastmsg)
 			user->signon = user->idle_lastmsg;
 		ServerInstance->SNO->WriteToSnoMask('a', user->nick+" used SETIDLE to set their idle time to "+ConvToStr(idle)+" seconds");
-		user->WriteNumeric(944, ":Idle time set.");
+		user->WriteNumeric(944, "Idle time set.");
 
 		return CMD_SUCCESS;
 	}
diff --git a/src/modules/m_silence.cpp b/src/modules/m_silence.cpp
index f2ac26fb3..7d3b3f90c 100644
--- a/src/modules/m_silence.cpp
+++ b/src/modules/m_silence.cpp
@@ -125,10 +125,10 @@ class CommandSilence : public Command
 				for (silencelist::const_iterator c = sl->begin(); c != sl->end(); c++)
 				{
 					std::string decomppattern = DecompPattern(c->second);
-					user->WriteNumeric(271, "%s %s %s", user->nick.c_str(),c->first.c_str(), decomppattern.c_str());
+					user->WriteNumeric(271, user->nick, c->first, decomppattern);
 				}
 			}
-			user->WriteNumeric(272, ":End of Silence List");
+			user->WriteNumeric(272, "End of Silence List");
 
 			return CMD_SUCCESS;
 		}
@@ -174,7 +174,7 @@ class CommandSilence : public Command
 						if (listitem == mask && i->second == pattern)
 						{
 							sl->erase(i);
-							user->WriteNumeric(950, "%s :Removed %s %s from silence list", user->nick.c_str(), mask.c_str(), decomppattern.c_str());
+							user->WriteNumeric(950, user->nick, InspIRCd::Format("Removed %s %s from silence list", mask.c_str(), decomppattern.c_str()));
 							if (!sl->size())
 							{
 								ext.unset(user);
@@ -183,7 +183,7 @@ class CommandSilence : public Command
 						}
 					}
 				}
-				user->WriteNumeric(952, "%s :%s %s does not exist on your silence list", user->nick.c_str(), mask.c_str(), decomppattern.c_str());
+				user->WriteNumeric(952, user->nick, InspIRCd::Format("%s %s does not exist on your silence list", mask.c_str(), decomppattern.c_str()));
 			}
 			else if (action == '+')
 			{
@@ -196,7 +196,7 @@ class CommandSilence : public Command
 				}
 				if (sl->size() > maxsilence)
 				{
-					user->WriteNumeric(952, "%s :Your silence list is full",user->nick.c_str());
+					user->WriteNumeric(952, user->nick, "Your silence list is full");
 					return CMD_FAILURE;
 				}
 
@@ -206,7 +206,7 @@ class CommandSilence : public Command
 					irc::string listitem = n->first.c_str();
 					if (listitem == mask && n->second == pattern)
 					{
-						user->WriteNumeric(952, "%s :%s %s is already on your silence list", user->nick.c_str(), mask.c_str(), decomppattern.c_str());
+						user->WriteNumeric(952, user->nick, InspIRCd::Format("%s %s is already on your silence list", mask.c_str(), decomppattern.c_str()));
 						return CMD_FAILURE;
 					}
 				}
@@ -218,7 +218,7 @@ class CommandSilence : public Command
 				{
 					sl->push_back(silenceset(mask,pattern));
 				}
-				user->WriteNumeric(951, "%s :Added %s %s to silence list", user->nick.c_str(), mask.c_str(), decomppattern.c_str());
+				user->WriteNumeric(951, user->nick, InspIRCd::Format("Added %s %s to silence list", mask.c_str(), decomppattern.c_str()));
 				return CMD_SUCCESS;
 			}
 		}
diff --git a/src/modules/m_spanningtree/main.cpp b/src/modules/m_spanningtree/main.cpp
index 726376844..ade8359ba 100644
--- a/src/modules/m_spanningtree/main.cpp
+++ b/src/modules/m_spanningtree/main.cpp
@@ -127,16 +127,15 @@ void ModuleSpanningTree::ShowLinks(TreeServer* Current, User* user, int hops)
 	else if ((Current->Hidden) && (!user->IsOper()))
 		return;
 
-	user->WriteNumeric(RPL_LINKS, "%s %s :%d %s",	Current->GetName().c_str(),
-			(Utils->FlatLinks && (!user->IsOper())) ? ServerInstance->Config->ServerName.c_str() : Parent.c_str(),
-			(Utils->FlatLinks && (!user->IsOper())) ? 0 : hops,
-			Current->GetDesc().c_str());
+	user->WriteNumeric(RPL_LINKS, Current->GetName(),
+			(((Utils->FlatLinks) && (!user->IsOper())) ? ServerInstance->Config->ServerName : Parent),
+			InspIRCd::Format("%d %s", (((Utils->FlatLinks) && (!user->IsOper())) ? 0 : hops), Current->GetDesc().c_str()));
 }
 
 void ModuleSpanningTree::HandleLinks(const std::vector<std::string>& parameters, User* user)
 {
 	ShowLinks(Utils->TreeRoot,user,0);
-	user->WriteNumeric(RPL_ENDOFLINKS, "* :End of /LINKS list.");
+	user->WriteNumeric(RPL_ENDOFLINKS, '*', "End of /LINKS list.");
 }
 
 std::string ModuleSpanningTree::TimeToStr(time_t secs)
@@ -304,11 +303,11 @@ ModResult ModuleSpanningTree::HandleVersion(const std::vector<std::string>& para
 		// or the server is a 2.0 server and does not send a full version.
 		bool showfull = ((user->IsOper()) && (!found->GetFullVersion().empty()));
 		const std::string& Version = (showfull ? found->GetFullVersion() : found->GetVersion());
-		user->WriteNumeric(RPL_VERSION, ":%s", Version.c_str());
+		user->WriteNumeric(RPL_VERSION, Version);
 	}
 	else
 	{
-		user->WriteNumeric(ERR_NOSUCHSERVER, "%s :No such server", parameters[0].c_str());
+		user->WriteNumeric(ERR_NOSUCHSERVER, parameters[0], "No such server");
 	}
 	return MOD_RES_DENY;
 }
diff --git a/src/modules/m_spanningtree/override_map.cpp b/src/modules/m_spanningtree/override_map.cpp
index 612df80f3..7ae6c6b4a 100644
--- a/src/modules/m_spanningtree/override_map.cpp
+++ b/src/modules/m_spanningtree/override_map.cpp
@@ -172,7 +172,7 @@ CmdResult CommandMap::Handle(const std::vector<std::string>& parameters, User* u
 		TreeServer* s = Utils->FindServerMask(parameters[0]);
 		if (!s)
 		{
-			user->WriteNumeric(ERR_NOSUCHSERVER, "%s :No such server", parameters[0].c_str());
+			user->WriteNumeric(ERR_NOSUCHSERVER, parameters[0], "No such server");
 			return CMD_FAILURE;
 		}
 
diff --git a/src/modules/m_spanningtree/override_whois.cpp b/src/modules/m_spanningtree/override_whois.cpp
index 430467dc7..7f7189854 100644
--- a/src/modules/m_spanningtree/override_whois.cpp
+++ b/src/modules/m_spanningtree/override_whois.cpp
@@ -31,8 +31,8 @@ ModResult ModuleSpanningTree::HandleRemoteWhois(const std::vector<std::string>&
 	}
 	else if (!remote)
 	{
-		user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[1].c_str());
-		user->WriteNumeric(RPL_ENDOFWHOIS, "%s :End of /WHOIS list.", parameters[1].c_str());
+		user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
+		user->WriteNumeric(RPL_ENDOFWHOIS, parameters[0], "End of /WHOIS list.");
 		return MOD_RES_DENY;
 	}
 	return MOD_RES_PASSTHRU;
diff --git a/src/modules/m_spanningtree/uid.cpp b/src/modules/m_spanningtree/uid.cpp
index a3b804579..01465670a 100644
--- a/src/modules/m_spanningtree/uid.cpp
+++ b/src/modules/m_spanningtree/uid.cpp
@@ -50,7 +50,7 @@ CmdResult CommandUID::HandleServer(TreeServer* remoteserver, std::vector<std::st
 		// User that the incoming user is colliding with is not fully registered, we force nick change the
 		// unregistered user to their uuid and tell them what happened
 		collideswith->WriteFrom(collideswith, "NICK %s", collideswith->uuid.c_str());
-		collideswith->WriteNumeric(ERR_NICKNAMEINUSE, "%s :Nickname overruled.", collideswith->nick.c_str());
+		collideswith->WriteNumeric(ERR_NICKNAMEINUSE, collideswith->nick, "Nickname overruled.");
 
 		// Clear the bit before calling User::ChangeNick() to make it NOT run the OnUserPostNick() hook
 		collideswith->registered &= ~REG_NICK;
diff --git a/src/modules/m_sslinfo.cpp b/src/modules/m_sslinfo.cpp
index 523d52abb..ac02908c4 100644
--- a/src/modules/m_sslinfo.cpp
+++ b/src/modules/m_sslinfo.cpp
@@ -95,7 +95,7 @@ class CommandSSLInfo : public Command
 
 		if ((!target) || (target->registered != REG_ALL))
 		{
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nickname", parameters[0].c_str());
+			user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 			return CMD_FAILURE;
 		}
 		bool operonlyfp = ServerInstance->Config->ConfValue("sslinfo")->getBool("operonly");
@@ -181,7 +181,7 @@ class ModuleSSLInfo : public Module, public Whois::EventListener
 
 				if (ifo->oper_block->getBool("sslonly") && !cert)
 				{
-					user->WriteNumeric(491, ":This oper login requires an SSL connection.");
+					user->WriteNumeric(491, "This oper login requires an SSL connection.");
 					user->CommandFloodPenalty += 10000;
 					return MOD_RES_DENY;
 				}
@@ -189,7 +189,7 @@ class ModuleSSLInfo : public Module, public Whois::EventListener
 				std::string fingerprint;
 				if (ifo->oper_block->readString("fingerprint", fingerprint) && (!cert || cert->GetFingerprint() != fingerprint))
 				{
-					user->WriteNumeric(491, ":This oper login requires a matching SSL certificate fingerprint.");
+					user->WriteNumeric(491, "This oper login requires a matching SSL certificate fingerprint.");
 					user->CommandFloodPenalty += 10000;
 					return MOD_RES_DENY;
 				}
diff --git a/src/modules/m_sslmodes.cpp b/src/modules/m_sslmodes.cpp
index 1a596f5e0..e499082ff 100644
--- a/src/modules/m_sslmodes.cpp
+++ b/src/modules/m_sslmodes.cpp
@@ -54,7 +54,7 @@ class SSLMode : public ModeHandler
 						ssl_cert* cert = API->GetCertificate(i->first);
 						if (!cert && !i->first->server->IsULine())
 						{
-							source->WriteNumeric(ERR_ALLMUSTSSL, "%s :all members of the channel must be connected via SSL", channel->name.c_str());
+							source->WriteNumeric(ERR_ALLMUSTSSL, channel->name, "all members of the channel must be connected via SSL");
 							return MODEACTION_DENY;
 						}
 					}
@@ -107,7 +107,7 @@ class ModuleSSLModes : public Module
 			else
 			{
 				// Deny
-				user->WriteNumeric(489, "%s :Cannot join channel; SSL users only (+z)", cname.c_str());
+				user->WriteNumeric(489, cname, "Cannot join channel; SSL users only (+z)");
 				return MOD_RES_DENY;
 			}
 		}
diff --git a/src/modules/m_starttls.cpp b/src/modules/m_starttls.cpp
index 054f9c334..b3cf5a263 100644
--- a/src/modules/m_starttls.cpp
+++ b/src/modules/m_starttls.cpp
@@ -44,23 +44,23 @@ class CommandStartTLS : public SplitCommand
 	{
 		if (!ssl)
 		{
-			user->WriteNumeric(ERR_STARTTLS, ":STARTTLS is not enabled");
+			user->WriteNumeric(ERR_STARTTLS, "STARTTLS is not enabled");
 			return CMD_FAILURE;
 		}
 
 		if (user->registered == REG_ALL)
 		{
-			user->WriteNumeric(ERR_STARTTLS, ":STARTTLS is not permitted after client registration is complete");
+			user->WriteNumeric(ERR_STARTTLS, "STARTTLS is not permitted after client registration is complete");
 			return CMD_FAILURE;
 		}
 
 		if (user->eh.GetIOHook())
 		{
-			user->WriteNumeric(ERR_STARTTLS, ":STARTTLS failure");
+			user->WriteNumeric(ERR_STARTTLS, "STARTTLS failure");
 			return CMD_FAILURE;
 		}
 
-		user->WriteNumeric(RPL_STARTTLS, ":STARTTLS successful, go ahead with TLS handshake");
+		user->WriteNumeric(RPL_STARTTLS, "STARTTLS successful, go ahead with TLS handshake");
 		/* We need to flush the write buffer prior to adding the IOHook,
 		 * otherwise we'll be sending this line inside the SSL session - which
 		 * won't start its handshake until the client gets this line. Currently,
diff --git a/src/modules/m_svshold.cpp b/src/modules/m_svshold.cpp
index a623e1553..b95a847a5 100644
--- a/src/modules/m_svshold.cpp
+++ b/src/modules/m_svshold.cpp
@@ -198,7 +198,7 @@ class ModuleSVSHold : public Module
 
 		if (rl)
 		{
-			user->WriteNumeric(ERR_ERRONEUSNICKNAME, "%s :Services reserved nickname: %s", newnick.c_str(), rl->reason.c_str());
+			user->WriteNumeric(ERR_ERRONEUSNICKNAME, newnick, InspIRCd::Format("Services reserved nickname: %s", rl->reason.c_str()));
 			return MOD_RES_DENY;
 		}
 
diff --git a/src/modules/m_swhois.cpp b/src/modules/m_swhois.cpp
index 80c7ddd3b..46d96a952 100644
--- a/src/modules/m_swhois.cpp
+++ b/src/modules/m_swhois.cpp
@@ -45,7 +45,7 @@ class CommandSwhois : public Command
 
 		if (!dest) // allow setting swhois using SWHOIS before reg
 		{
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such nick/channel", parameters[0].c_str());
+			user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 			return CMD_FAILURE;
 		}
 
diff --git a/src/modules/m_timedbans.cpp b/src/modules/m_timedbans.cpp
index 8196d37ba..8a627b9a6 100644
--- a/src/modules/m_timedbans.cpp
+++ b/src/modules/m_timedbans.cpp
@@ -72,14 +72,13 @@ class CommandTban : public Command
 		Channel* channel = ServerInstance->FindChan(parameters[0]);
 		if (!channel)
 		{
-			user->WriteNumeric(ERR_NOSUCHNICK, "%s :No such channel", parameters[0].c_str());
+			user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 			return CMD_FAILURE;
 		}
 		int cm = channel->GetPrefixValue(user);
 		if (cm < HALFOP_VALUE)
 		{
-			user->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You do not have permission to set bans on this channel",
-				channel->name.c_str());
+			user->WriteNumeric(ERR_CHANOPRIVSNEEDED, channel->name, "You do not have permission to set bans on this channel");
 			return CMD_FAILURE;
 		}
 
diff --git a/src/modules/m_topiclock.cpp b/src/modules/m_topiclock.cpp
index 6053bc849..eba2b33f0 100644
--- a/src/modules/m_topiclock.cpp
+++ b/src/modules/m_topiclock.cpp
@@ -150,7 +150,7 @@ class ModuleTopicLock : public Module
 		// Only fired for local users currently, but added a check anyway
 		if ((IS_LOCAL(user)) && (topiclock.get(chan)))
 		{
-			user->WriteNumeric(744, "%s :TOPIC cannot be changed due to topic lock being active on the channel", chan->name.c_str());
+			user->WriteNumeric(744, chan->name, "TOPIC cannot be changed due to topic lock being active on the channel");
 			return MOD_RES_DENY;
 		}
 
diff --git a/src/modules/m_uninvite.cpp b/src/modules/m_uninvite.cpp
index e92688d1d..94f71d9c1 100644
--- a/src/modules/m_uninvite.cpp
+++ b/src/modules/m_uninvite.cpp
@@ -51,11 +51,11 @@ class CommandUninvite : public Command
 		{
 			if (!c)
 			{
-				user->WriteNumeric(401, "%s :No such nick/channel", parameters[1].c_str());
+				user->WriteNumeric(Numerics::NoSuchNick(parameters[1]));
 			}
 			else
 			{
-				user->WriteNumeric(401, "%s :No such nick/channel", parameters[0].c_str());
+				user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
 			}
 
 			return CMD_FAILURE;
@@ -65,7 +65,7 @@ class CommandUninvite : public Command
 		{
 			if (c->GetPrefixValue(user) < HALFOP_VALUE)
 			{
-				user->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s :You must be a channel %soperator", c->name.c_str(), c->GetPrefixValue(u) == HALFOP_VALUE ? "" : "half-");
+				user->WriteNumeric(ERR_CHANOPRIVSNEEDED, c->name, InspIRCd::Format("You must be a channel %soperator", c->GetPrefixValue(u) == HALFOP_VALUE ? "" : "half-"));
 				return CMD_FAILURE;
 			}
 		}
@@ -84,7 +84,7 @@ class CommandUninvite : public Command
 			}
 
 			user->SendText(":%s 494 %s %s %s :Uninvited", user->server->GetName().c_str(), user->nick.c_str(), c->name.c_str(), u->nick.c_str());
-			lu->WriteNumeric(493, ":You were uninvited from %s by %s", c->name.c_str(), user->nick.c_str());
+			lu->WriteNumeric(493, InspIRCd::Format("You were uninvited from %s by %s", c->name.c_str(), user->nick.c_str()));
 
 			std::string msg = "*** " + user->nick + " uninvited " + u->nick + ".";
 			c->WriteChannelWithServ(ServerInstance->Config->ServerName, "NOTICE " + c->name + " :" + msg);
diff --git a/src/modules/m_userip.cpp b/src/modules/m_userip.cpp
index 043967393..1b2ce9b13 100644
--- a/src/modules/m_userip.cpp
+++ b/src/modules/m_userip.cpp
@@ -52,7 +52,7 @@ class CommandUserip : public Command
 						checked_privs = true;
 						has_privs = user->HasPrivPermission("users/auspex");
 						if (!has_privs)
-							user->WriteNumeric(ERR_NOPRIVILEGES, ":Permission Denied - You do not have the required operator privileges");
+							user->WriteNumeric(ERR_NOPRIVILEGES, "Permission Denied - You do not have the required operator privileges");
 					}
 
 					if (!has_privs)
diff --git a/src/modules/m_watch.cpp b/src/modules/m_watch.cpp
index bdd4b2b15..6e9a6f9ed 100644
--- a/src/modules/m_watch.cpp
+++ b/src/modules/m_watch.cpp
@@ -53,12 +53,12 @@ class CommandWatch : public SplitCommand
 		{
 			// The away state should only be sent if the client requests away notifications for a nick but 2.0 always sends them so we do that too
 			if (target->IsAway())
-				user->WriteNumeric(RPL_NOWISAWAY, "%s %s %s %lu :is away", target->nick.c_str(), target->ident.c_str(), target->dhost.c_str(), (unsigned long)target->awaytime);
+				user->WriteNumeric(RPL_NOWISAWAY, target->nick, target->ident, target->dhost, (unsigned long)target->awaytime, "is away");
 			else
-				user->WriteNumeric(RPL_NOWON, "%s %s %s %lu :is online", target->nick.c_str(), target->ident.c_str(), target->dhost.c_str(), (unsigned long)target->age);
+				user->WriteNumeric(RPL_NOWON, target->nick, target->ident, target->dhost, (unsigned long)target->age, "is online");
 		}
 		else if (show_offline)
-			user->WriteNumeric(RPL_NOWOFF, "%s * * 0 :is offline", nick.c_str());
+			user->WriteNumeric(RPL_NOWOFF, nick, "*", "*", "0", "is offline");
 	}
 
 	void HandlePlus(LocalUser* user, const std::string& nick)
@@ -67,12 +67,12 @@ class CommandWatch : public SplitCommand
 		if (result == IRCv3::Monitor::Manager::WR_TOOMANY)
 		{
 			// List is full, send error numeric
-			user->WriteNumeric(ERR_TOOMANYWATCH, "%s :Too many WATCH entries", nick.c_str());
+			user->WriteNumeric(ERR_TOOMANYWATCH, nick, "Too many WATCH entries");
 			return;
 		}
 		else if (result == IRCv3::Monitor::Manager::WR_INVALIDNICK)
 		{
-			user->WriteNumeric(942, "%s :Invalid nickname", nick.c_str());
+			user->WriteNumeric(942, nick, "Invalid nickname");
 			return;
 		}
 		else if (result != IRCv3::Monitor::Manager::WR_OK)
@@ -88,9 +88,9 @@ class CommandWatch : public SplitCommand
 
 		User* target = IRCv3::Monitor::Manager::FindNick(nick);
 		if (target)
-			user->WriteNumeric(RPL_WATCHOFF, "%s %s %s %lu :stopped watching", target->nick.c_str(), target->ident.c_str(), target->dhost.c_str(), (unsigned long)target->age);
+			user->WriteNumeric(RPL_WATCHOFF, target->nick, target->ident, target->dhost, (unsigned long)target->age, "stopped watching");
 		else
-			user->WriteNumeric(RPL_WATCHOFF, "%s * * 0 :stopped watching", nick.c_str());
+			user->WriteNumeric(RPL_WATCHOFF, nick, "*", "*", "0", "stopped watching");
 	}
 
 	void HandleList(LocalUser* user, bool show_offline)
@@ -102,7 +102,7 @@ class CommandWatch : public SplitCommand
 			const IRCv3::Monitor::Entry* entry = *i;
 			SendOnlineOffline(user, entry->GetNick(), show_offline);
 		}
-		user->WriteNumeric(RPL_ENDOFWATCHLIST, ":End of WATCH list");
+		user->WriteNumeric(RPL_ENDOFWATCHLIST, "End of WATCH list");
 	}
 
 	void HandleStats(LocalUser* user)
@@ -111,7 +111,7 @@ class CommandWatch : public SplitCommand
 
 		// Do not show how many clients are watching this nick, it's pointless
 		const IRCv3::Monitor::WatchedList& list = manager.GetWatched(user);
-		user->WriteNumeric(RPL_WATCHSTAT, ":You have %lu and are on 0 WATCH entries", (unsigned long)list.size());
+		user->WriteNumeric(RPL_WATCHSTAT, InspIRCd::Format("You have %lu and are on 0 WATCH entries", (unsigned long)list.size()));
 
 		Numeric::Builder<' '> out(user, RPL_WATCHLIST);
 		for (IRCv3::Monitor::WatchedList::const_iterator i = list.begin(); i != list.end(); ++i)
@@ -120,7 +120,7 @@ class CommandWatch : public SplitCommand
 			out.Add(entry->GetNick());
 		}
 		out.Flush();
-		user->WriteNumeric(RPL_ENDOFWATCHLIST, ":End of WATCH S");
+		user->WriteNumeric(RPL_ENDOFWATCHLIST, "End of WATCH S");
 	}
 
  public:
@@ -189,11 +189,12 @@ class ModuleWatch : public Module
 		if (!list)
 			return;
 
-		std::string text = InspIRCd::Format("%s %s %s %lu :%s", nick.c_str(), user->ident.c_str(), user->dhost.c_str(), (unsigned long) shownts, numerictext);
+		Numeric::Numeric num(numeric);
+		num.push(nick).push(user->ident).push(user->dhost).push(ConvToStr(shownts)).push(numerictext);
 		for (IRCv3::Monitor::WatcherList::const_iterator i = list->begin(); i != list->end(); ++i)
 		{
 			LocalUser* curr = *i;
-			curr->WriteNumeric(numeric, text);
+			curr->WriteNumeric(num);
 		}
 	}
 
diff --git a/src/server.cpp b/src/server.cpp
index 191a3d30f..f22cf1ad4 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -194,35 +194,34 @@ void ISupportManager::Build()
 	}
 
 	// Transform the map into a list of lines, ready to be sent to clients
-	std::string line;
+	Numeric::Numeric numeric(RPL_ISUPPORT);
 	unsigned int token_count = 0;
 	cachedlines.clear();
 
 	for (std::map<std::string, std::string>::const_iterator it = tokens.begin(); it != tokens.end(); ++it)
 	{
-		line.append(it->first);
+		numeric.push(it->first);
+		std::string& token = numeric.GetParams().back();
 
 		// If this token has a value then append a '=' char after the name and then the value itself
 		if (!it->second.empty())
-			line.append(1, '=').append(it->second);
+			token.append(1, '=').append(it->second);
 
-		// Always append a space, even if it's the last token because all lines will be suffixed
-		line.push_back(' ');
 		token_count++;
 
 		if (token_count % 13 == 12 || it == --tokens.end())
 		{
 			// Reached maximum number of tokens for this line or the current token
 			// is the last one; finalize the line and store it for later use
-			line.append(":are supported by this server");
-			cachedlines.push_back(line);
-			line.clear();
+			numeric.push("are supported by this server");
+			cachedlines.push_back(numeric);
+			numeric.GetParams().clear();
 		}
 	}
 }
 
 void ISupportManager::SendTo(LocalUser* user)
 {
-	for (std::vector<std::string>::const_iterator i = cachedlines.begin(); i != cachedlines.end(); ++i)
-		user->WriteNumeric(RPL_ISUPPORT, *i);
+	for (std::vector<Numeric::Numeric>::const_iterator i = cachedlines.begin(); i != cachedlines.end(); ++i)
+		user->WriteNumeric(*i);
 }
diff --git a/src/usermanager.cpp b/src/usermanager.cpp
index ba6bbf36b..fe052fcfc 100644
--- a/src/usermanager.cpp
+++ b/src/usermanager.cpp
@@ -127,7 +127,7 @@ void UserManager::AddUser(int socket, ListenSocket* via, irc::sockets::sockaddrs
 			/* user banned */
 			ServerInstance->Logs->Log("BANCACHE", LOG_DEBUG, "BanCache: Positive hit for " + New->GetIPString());
 			if (!ServerInstance->Config->XLineMessage.empty())
-				New->WriteNumeric(ERR_YOUREBANNEDCREEP, ":" + ServerInstance->Config->XLineMessage);
+				New->WriteNumeric(ERR_YOUREBANNEDCREEP, ServerInstance->Config->XLineMessage);
 			this->QuitUser(New, b->Reason);
 			return;
 		}
diff --git a/src/users.cpp b/src/users.cpp
index 915afd8b8..b6fbc38a0 100644
--- a/src/users.cpp
+++ b/src/users.cpp
@@ -348,7 +348,7 @@ void User::Oper(OperInfo* info)
 
 	ServerInstance->SNO->WriteToSnoMask('o',"%s (%s@%s) is now an IRC operator of type %s (using oper '%s')",
 		nick.c_str(), ident.c_str(), host.c_str(), oper->name.c_str(), opername.c_str());
-	this->WriteNumeric(RPL_YOUAREOPER, ":You are now %s %s", strchr("aeiouAEIOU", oper->name[0]) ? "an" : "a", oper->name.c_str());
+	this->WriteNumeric(RPL_YOUAREOPER, InspIRCd::Format("You are now %s %s", strchr("aeiouAEIOU", oper->name[0]) ? "an" : "a", oper->name.c_str()));
 
 	ServerInstance->Logs->Log("OPER", LOG_DEFAULT, "%s opered as type: %s", GetFullRealHost().c_str(), oper->name.c_str());
 	ServerInstance->Users->all_opers.push_back(this);
@@ -524,12 +524,12 @@ void LocalUser::FullConnect()
 	if (quitting)
 		return;
 
-	this->WriteNumeric(RPL_WELCOME, ":Welcome to the %s IRC Network %s", ServerInstance->Config->Network.c_str(), GetFullRealHost().c_str());
-	this->WriteNumeric(RPL_YOURHOSTIS, ":Your host is %s, running version %s", ServerInstance->Config->ServerName.c_str(), INSPIRCD_BRANCH);
-	this->WriteNumeric(RPL_SERVERCREATED, ":This server was created %s %s", __TIME__, __DATE__);
+	this->WriteNumeric(RPL_WELCOME, InspIRCd::Format("Welcome to the %s IRC Network %s", ServerInstance->Config->Network.c_str(), GetFullRealHost().c_str()));
+	this->WriteNumeric(RPL_YOURHOSTIS, InspIRCd::Format("Your host is %s, running version %s", ServerInstance->Config->ServerName.c_str(), INSPIRCD_BRANCH));
+	this->WriteNumeric(RPL_SERVERCREATED, InspIRCd::Format("This server was created %s %s", __TIME__, __DATE__));
 
 	const std::string& modelist = ServerInstance->Modes->GetModeListFor004Numeric();
-	this->WriteNumeric(RPL_SERVERVERSION, "%s %s %s", ServerInstance->Config->ServerName.c_str(), INSPIRCD_BRANCH, modelist.c_str());
+	this->WriteNumeric(RPL_SERVERVERSION, ServerInstance->Config->ServerName, INSPIRCD_BRANCH, modelist);
 
 	ServerInstance->ISupport.SendTo(this);
 
@@ -615,7 +615,7 @@ bool User::ChangeNick(const std::string& newnick, time_t newts)
 			{
 				/* force the camper to their UUID, and ask them to re-send a NICK. */
 				InUse->WriteFrom(InUse, "NICK %s", InUse->uuid.c_str());
-				InUse->WriteNumeric(ERR_NICKNAMEINUSE, "%s :Nickname overruled.", InUse->nick.c_str());
+				InUse->WriteNumeric(ERR_NICKNAMEINUSE, InUse->nick, "Nickname overruled.");
 
 				InUse->registered &= ~REG_NICK;
 				InUse->ChangeNick(InUse->uuid);
@@ -623,7 +623,7 @@ bool User::ChangeNick(const std::string& newnick, time_t newts)
 			else
 			{
 				/* No camping, tell the incoming user  to stop trying to change nick ;p */
-				this->WriteNumeric(ERR_NICKNAMEINUSE, "%s :Nickname is already in use.", newnick.c_str());
+				this->WriteNumeric(ERR_NICKNAMEINUSE, newnick, "Nickname is already in use.");
 				return false;
 			}
 		}
@@ -802,25 +802,16 @@ namespace
 	}
 }
 
-void User::WriteNumeric(unsigned int numeric, const char* text, ...)
-{
-	std::string textbuffer;
-	VAFORMAT(textbuffer, text, text);
-	this->WriteNumeric(numeric, textbuffer);
-}
-
-void User::WriteNumeric(unsigned int numeric, const std::string &text)
+void User::WriteNumeric(const Numeric::Numeric& numeric)
 {
 	ModResult MOD_RESULT;
 
-	FIRST_MOD_RESULT(OnNumeric, MOD_RESULT, (this, numeric, text));
+	FIRST_MOD_RESULT(OnNumeric, MOD_RESULT, (this, numeric));
 
 	if (MOD_RESULT == MOD_RES_DENY)
 		return;
 
-	const std::string message = InspIRCd::Format(":%s %03u %s %s", ServerInstance->Config->ServerName.c_str(),
-		numeric, this->registered & REG_NICK ? this->nick.c_str() : "*", text.c_str());
-	this->Write(message);
+	this->Write(BuildNumeric(ServerInstance->Config->ServerName, this, numeric.GetNumeric(), numeric.GetParams()));
 }
 
 void User::WriteFrom(User *user, const std::string &text)
@@ -1026,7 +1017,7 @@ bool User::ChangeDisplayedHost(const std::string& shost)
 	this->InvalidateCache();
 
 	if (IS_LOCAL(this))
-		this->WriteNumeric(RPL_YOURDISPLAYEDHOST, "%s :is now your displayed host", this->dhost.c_str());
+		this->WriteNumeric(RPL_YOURDISPLAYEDHOST, this->dhost, "is now your displayed host");
 
 	return true;
 }
diff --git a/src/xline.cpp b/src/xline.cpp
index dedf8c7a9..003d77e80 100644
--- a/src/xline.cpp
+++ b/src/xline.cpp
@@ -531,7 +531,7 @@ void XLine::DefaultApply(User* u, const std::string &line, bool bancache)
 	const std::string banReason = line + "-Lined: " + reason;
 
 	if (!ServerInstance->Config->XLineMessage.empty())
-		u->WriteNumeric(ERR_YOUREBANNEDCREEP, ":" + ServerInstance->Config->XLineMessage);
+		u->WriteNumeric(ERR_YOUREBANNEDCREEP, ServerInstance->Config->XLineMessage);
 
 	if (ServerInstance->Config->HideBans)
 		ServerInstance->Users->QuitUser(u, line + "-Lined", &banReason);