--- lbbs/src/bbs_net.c	2025/11/01 15:34:45	1.75
+++ lbbs/src/bbs_net.c	2025/11/05 04:19:21	1.80
@@ -1,18 +1,10 @@
-/***************************************************************************
-						  bbs_net.c  -  description
-							 -------------------
-	Copyright            : (C) 2004-2025 by Leaflet
-	Email                : leaflet@leafok.com
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 3 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- ***************************************************************************/
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * bbs_net
+ *   - user interactive feature of site shuttle
+ *
+ * Copyright (C) 2004-2025  Leaflet <leaflet@leafok.com>
+ */
 
 #include "bbs.h"
 #include "common.h"
@@ -41,11 +33,14 @@
 #include <sys/socket.h>
 #include <sys/epoll.h>
 
-#define MENU_CONF_DELIM " \t\r\n"
+static const char MENU_CONF_DELIM[] = " \t\r\n";
 
-#define MAX_PROCESS_BAR_LEN 30
-#define MAXSTATION 26 * 2
-#define STATION_PER_LINE 4
+enum _bbs_net_constant_t
+{
+	MAX_PROCESS_BAR_LEN = 30,
+	MAXSTATION = 26 * 2,
+	STATION_PER_LINE = 4,
+};
 
 struct _bbsnet_conf
 {
@@ -53,7 +48,7 @@ struct _bbsnet_conf
 	char host2[40];
 	char ip[40];
 	in_port_t port;
-	char charset[20];
+	char charset[CHARSET_MAX_LEN + 1];
 } bbsnet_conf[MAXSTATION];
 
 static MENU_SET bbsnet_menu;
@@ -484,7 +479,7 @@ static int bbsnet_connect(int n)
 		}
 		else if (nfds == 0) // timeout
 		{
-			if (time(NULL) - BBS_last_access_tm >= MAX_DELAY_TIME)
+			if (time(NULL) - BBS_last_access_tm >= BBS_max_user_idle_time)
 			{
 				break;
 			}
@@ -882,7 +877,7 @@ extern int bbs_net()
 			log_error("KEY_NULL\n");
 			goto cleanup;
 		case KEY_TIMEOUT:
-			if (time(NULL) - BBS_last_access_tm >= MAX_DELAY_TIME)
+			if (time(NULL) - BBS_last_access_tm >= BBS_max_user_idle_time)
 			{
 				log_error("User input timeout\n");
 				goto cleanup;