degesch: parse CHANMODES in RPL_ISUPPORT

We're going to need that to parse MODE changes.

degesch.c

@@ -1055,6 +1055,11 @@ struct server
 	char *irc_idchan_prefixes;          ///< Prefixes for "safe channels"
 	char *irc_statusmsg;                ///< Prefixes for channel targets
 
+	char *irc_chanmodes_list;           ///< Channel modes for lists
+	char *irc_chanmodes_param_always;   ///< Channel modes with mandatory param
+	char *irc_chanmodes_param_when_set; ///< Channel modes with param when set
+	char *irc_chanmodes_param_never;    ///< Channel modes without param
+
 	char *irc_chanuser_prefixes;        ///< Channel user prefixes
 	char *irc_chanuser_modes;           ///< Channel user modes
 
@@ -1078,7 +1083,7 @@ server_init (struct server *self, struct poller *poller)
 	str_init (&self->read_buffer);
 	self->state = IRC_DISCONNECTED;
 
-	// Defaults as per the RPL_ISUPPORT draft
+	// Defaults as per the RPL_ISUPPORT drafts, or RFC 1459
 	self->irc_tolower = irc_tolower;
 	self->irc_strxfrm = irc_strxfrm;
 
@@ -1086,6 +1091,11 @@ server_init (struct server *self, struct poller *poller)
 	self->irc_idchan_prefixes   = xstrdup ("");
 	self->irc_statusmsg         = xstrdup ("");
 
+	self->irc_chanmodes_list           = xstrdup ("b");
+	self->irc_chanmodes_param_always   = xstrdup ("k");
+	self->irc_chanmodes_param_when_set = xstrdup ("l");
+	self->irc_chanmodes_param_never    = xstrdup ("imnpst");
+
 	self->irc_chanuser_prefixes = xstrdup ("@+");
 	self->irc_chanuser_modes    = xstrdup ("ov");
 
@@ -1140,6 +1150,11 @@ server_free (struct server *self)
 	free (self->irc_idchan_prefixes);
 	free (self->irc_statusmsg);
 
+	free (self->irc_chanmodes_list);
+	free (self->irc_chanmodes_param_always);
+	free (self->irc_chanmodes_param_when_set);
+	free (self->irc_chanmodes_param_never);
+
 	free (self->irc_chanuser_prefixes);
 	free (self->irc_chanuser_modes);
 
@@ -4643,6 +4658,26 @@ irc_handle_isupport_statusmsg (struct server *s, char *value)
 	s->irc_statusmsg = xstrdup (value);
 }
 
+static void
+irc_handle_isupport_chanmodes (struct server *s, char *value)
+{
+	struct str_vector v;
+	str_vector_init (&v);
+	split_str_ignore_empty (value, ',', &v);
+	if (v.len >= 4)
+	{
+		free (s->irc_chanmodes_list);
+		s->irc_chanmodes_list           = xstrdup (v.vector[0]);
+		free (s->irc_chanmodes_param_always);
+		s->irc_chanmodes_param_always   = xstrdup (v.vector[1]);
+		free (s->irc_chanmodes_param_when_set);
+		s->irc_chanmodes_param_when_set = xstrdup (v.vector[2]);
+		free (s->irc_chanmodes_param_never);
+		s->irc_chanmodes_param_never    = xstrdup (v.vector[3]);
+	}
+	str_vector_free (&v);
+}
+
 static void
 unescape_isupport_value (const char *value, struct str *output)
 {
@@ -4689,8 +4724,10 @@ irc_handle_rpl_isupport (struct server *s, const struct irc_message *msg)
 			irc_handle_isupport_idchan      (s, value_unescaped.str);
 		else if (!strcmp (param, "STATUSMSG"))
 			irc_handle_isupport_statusmsg   (s, value_unescaped.str);
+		else if (!strcmp (param, "CHANMODES"))
+			irc_handle_isupport_chanmodes   (s, value_unescaped.str);
 
-		// TODO: also parse MODES, TARGMAX, CHANMODES and make use of them
+		// TODO: also parse MODES, TARGMAX and make use of them
 		//   to split client commands as necessary
 
 		str_free (&value_unescaped);