Bump ParamCap to 254

Apparently IRCds have decided that the 15-parameter limit doesn't matter
anymore. 254 is the maximum number of single-byte parameters (following
a single-byte command) which fit in a 512-byte CR-LF-terminated line.
When everyone decides that the 512-byte line length limit doesn't matter
either, I will delete my software and people can use some JavaScript
garbage instead.

This makes struct Message 2080 bytes, but there's only ever one or two
of them around at once. Avoid passing it by value to handle.

chat.c

@@ -337,7 +337,7 @@ int main(int argc, char *argv[]) {
 		.cmd = "QUIT",
 		.params[0] = self.quit,
 	};
-	handle(msg);
+	handle(&msg);
 
 	ircClose();
 	logClose();

chat.h

@@ -155,7 +155,7 @@ enum Tag {
 	TagCap,
 };
 
-enum { ParamCap = 15 };
+enum { ParamCap = 254 };
 struct Message {
 	char *tags[TagCap];
 	char *nick;
@@ -204,7 +204,7 @@ extern struct Replies {
 	uint whois;
 } replies;
 
-void handle(struct Message msg);
+void handle(struct Message *msg);
 void command(uint id, char *input);
 const char *commandIsPrivmsg(uint id, const char *input);
 const char *commandIsNotice(uint id, const char *input);

command.c

@@ -61,7 +61,7 @@ static void echoMessage(char *cmd, uint id, char *params) {
 		.params[0] = idNames[id],
 		.params[1] = params,
 	};
-	handle(msg);
+	handle(&msg);
 }
 
 static void splitMessage(char *cmd, uint id, char *params) {
@@ -213,9 +213,7 @@ static void channelListMode(uint id, char pm, char l, const char *params) {
 	for (const char *ch = params; *ch; ++ch) {
 		if (*ch == ' ') count++;
 	}
-	char modes[ParamCap - 2 + 1] = {
-		l, l, l, l, l, l, l, l, l, l, l, l, l, '\0'
-	};
+	char modes[13 + 1] = { l, l, l, l, l, l, l, l, l, l, l, l, l, '\0' };
 	ircFormat("MODE %s %c%.*s %s\r\n", idNames[id], pm, count, modes, params);
 }
 

handle.c

@@ -1228,17 +1228,17 @@ static int compar(const void *cmd, const void *_handler) {
 	return strcmp(cmd, handler->cmd);
 }
 
-void handle(struct Message msg) {
-	if (!msg.cmd) return;
-	if (msg.tags[TagPos]) {
-		self.pos = strtoull(msg.tags[TagPos], NULL, 10);
+void handle(struct Message *msg) {
+	if (!msg->cmd) return;
+	if (msg->tags[TagPos]) {
+		self.pos = strtoull(msg->tags[TagPos], NULL, 10);
 	}
 	const struct Handler *handler = bsearch(
-		msg.cmd, Handlers, ARRAY_LEN(Handlers), sizeof(*handler), compar
+		msg->cmd, Handlers, ARRAY_LEN(Handlers), sizeof(*handler), compar
 	);
 	if (handler) {
-		handler->fn(&msg);
-	} else if (strcmp(msg.cmd, "400") >= 0 && strcmp(msg.cmd, "599") <= 0) {
-		handleErrorGeneric(&msg);
+		handler->fn(msg);
+	} else if (strcmp(msg->cmd, "400") >= 0 && strcmp(msg->cmd, "599") <= 0) {
+		handleErrorGeneric(msg);
 	}
 }

irc.c

@@ -279,7 +279,8 @@ void ircRecv(void) {
 		if (!crlf) break;
 		*crlf = '\0';
 		debug(">>", line);
-		handle(parse(line));
+		struct Message msg = parse(line);
+		handle(&msg);
 		line = crlf + 2;
 	}