+static ttt_error_t
+_ttt_client_execute_invite (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ const char *username;
+ char *response;
+ char *notice;
+ ttt_error_t error;
+
+ assert (num_args == 1);
+
+ username = args[0];
+
+ if (!client->registered)
+ return TTT_ERROR_NO_NAME_SET;
+
+ error = ttt_server_verify_username (client->server, username);
+ if (error)
+ return error;
+
+ xasprintf (&response, "INVITE\r\n");
+ ttt_client_send (client, response);
+
+ xasprintf (¬ice, "NOTICE INVITE %s %s\r\n",
+ client->username,
+ username);
+ ttt_server_broadcast (client->server, notice);
+
+ /* XXX: Store invitation in state */
+
+ free (notice);
+ free (response);
+
+ return TTT_ERROR_NONE;
+}
+
+static ttt_error_t
+_ttt_client_execute_accept (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ const char *username;
+ char *response;
+ char *notice;
+ ttt_error_t error;
+
+ assert (num_args == 1);
+
+ username = args[0];
+
+ if (!client->registered)
+ return TTT_ERROR_NO_NAME_SET;
+
+ error = ttt_server_verify_username (client->server, username);
+ if (error)
+ return error;
+
+ /* XXX: Verify invitation, else return ERROR NO_INVITE */
+
+ xasprintf (&response, "ACCEPT\r\n");
+ ttt_client_send (client, response);
+
+ xasprintf (¬ice, "NOTICE ACCEPT %s %s\r\n",
+ client->username,
+ username);
+ ttt_server_broadcast (client->server, notice);
+
+ /* XXX: Start a new game */
+
+ free (notice);
+ free (response);
+
+ return TTT_ERROR_NONE;
+}
+
+static ttt_error_t
+_ttt_client_execute_retract (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ const char *username;
+ char *response;
+ char *notice;
+ ttt_error_t error;
+
+ assert (num_args == 1);
+
+ username = args[0];
+
+ if (!client->registered)
+ return TTT_ERROR_NO_NAME_SET;
+
+ error = ttt_server_verify_username (client->server, username);
+ if (error)
+ return error;
+
+ /* XXX: Verify invitation, else return ERROR NO_INVITE */
+
+ xasprintf (&response, "RETRACT\r\n");
+ ttt_client_send (client, response);
+
+ xasprintf (¬ice, "NOTICE RETRACT %s %s\r\n",
+ client->username,
+ username);
+ ttt_server_broadcast (client->server, notice);
+
+ /* XXX: Remove invitiation from state */
+
+ free (notice);
+ free (response);
+
+ return TTT_ERROR_NONE;
+}
+
+static ttt_error_t
+_ttt_client_execute_decline (ttt_client_t *client,
+ char **args,
+ int num_args)
+{
+ const char *username;
+ char *response;
+ char *notice;
+ ttt_error_t error;
+
+ assert (num_args == 1);
+
+ username = args[0];
+
+ if (!client->registered)
+ return TTT_ERROR_NO_NAME_SET;
+
+ error = ttt_server_verify_username (client->server, username);
+ if (error)
+ return error;
+
+ /* XXX: Verify invitation, else return ERROR NO_INVITE */
+
+ xasprintf (&response, "DECLINE\r\n");
+ ttt_client_send (client, response);
+
+ xasprintf (¬ice, "NOTICE DECLINE %s %s\r\n",
+ client->username,
+ username);
+ ttt_server_broadcast (client->server, notice);
+
+ /* XXX: Remove invitation from state */
+
+ free (notice);
+ free (response);
+
+ return TTT_ERROR_NONE;
+}
+