--- lbbs/src/screen.c	2025/05/20 08:24:28	1.68
+++ lbbs/src/screen.c	2025/05/29 02:45:23	1.77
@@ -22,7 +22,6 @@
 #include "io.h"
 #include "file_loader.h"
 #include <fcntl.h>
-#include <string.h>
 #include <ctype.h>
 #include <unistd.h>
 #include <stdlib.h>
@@ -32,8 +31,15 @@
 #include <sys/param.h>
 #include <sys/shm.h>
 
+#define _POSIX_C_SOURCE 200809L
+#include <string.h>
+
 #define ACTIVE_BOARD_HEIGHT 8
 
+#define STR_TOP_LEFT_MAX_LEN 40
+#define STR_TOP_MIDDLE_MAX_LEN 20
+#define STR_TOP_RIGHT_MAX_LEN 20
+
 void moveto(int row, int col)
 {
 	if (row >= 0)
@@ -241,7 +247,7 @@ int display_file_ex(const char *filename
 	long int percentile;
 	int loop;
 
-	if ((p_shm = get_file_shm(filename, &data_len, &line_total, &p_data, &p_line_offsets)) == NULL)
+	if ((p_shm = get_file_shm_readonly(filename, &data_len, &line_total, &p_data, &p_line_offsets)) == NULL)
 	{
 		log_error("get_file_shm(%s) error\n", filename);
 		return KEY_NULL;
@@ -365,6 +371,7 @@ int display_file_ex(const char *filename
 					max_lines = SCREEN_ROWS - 1;
 					clrline(begin_line, SCREEN_ROWS);
 					break;
+				case KEY_ESC:
 				case KEY_LEFT:
 				case 'q':
 				case 'Q':
@@ -419,37 +426,44 @@ int display_file_ex(const char *filename
 	}
 
 cleanup:
+	if (detach_file_shm(p_shm) < 0)
+	{
+		log_error("detach_file_shm(%s) error\n", filename);
+	}
+
 	return ch;
 }
 
-int show_top(const char *status)
+int show_top(const char *str_left, const char *str_middle, const char *str_right)
 {
-	char status_f[21];
-	int truncate;
-	int status_len;
-	int section_name_len;
+	char str_left_f[STR_TOP_LEFT_MAX_LEN + 1];
+	char str_middle_f[STR_TOP_MIDDLE_MAX_LEN + 1];
+	char str_right_f[STR_TOP_RIGHT_MAX_LEN + 1];
+	int str_left_len;
+	int str_middle_len;
+	int str_right_len;
+	int eol;
 	int len;
 
-	strncpy(status_f, status, sizeof(status_f) - 1);
-	status_f[sizeof(status_f) - 1] = '\0';
-
-	len = split_line(status_f, 20, &truncate, &status_len);
-	if (truncate)
-	{
-		log_error("Status string is truncated\n");
-		status_f[len] = '\0';
-	}
-
-	len = split_line(BBS_current_section_name, BBS_section_name_max_len, &truncate, &section_name_len);
-	if (truncate)
-	{
-		log_error("Section name is truncated\n");
-	}
+	strncpy(str_left_f, str_left, sizeof(str_left_f) - 1);
+	str_left_f[sizeof(str_left_f) - 1] = '\0';
+	len = split_line(str_left_f, STR_TOP_LEFT_MAX_LEN, &eol, &str_left_len);
+	str_left_f[len] = '\0';
+
+	strncpy(str_middle_f, str_middle, sizeof(str_middle_f) - 1);
+	str_middle_f[sizeof(str_middle_f) - 1] = '\0';
+	len = split_line(str_middle, STR_TOP_MIDDLE_MAX_LEN, &eol, &str_middle_len);
+	str_middle_f[len] = '\0';
+
+	strncpy(str_right_f, str_right, sizeof(str_right_f) - 1);
+	str_right_f[sizeof(str_right_f) - 1] = '\0';
+	len = split_line(str_right, STR_TOP_RIGHT_MAX_LEN, &eol, &str_right_len);
+	str_right_f[len] = '\0';
 
 	moveto(1, 0);
 	clrtoeol();
-	prints("\033[1;44;33m%s\033[37m%*s%*s\033[33m 讨论区 [%s]\033[m",
-		   status_f, 44 - status_len, BBS_name, 26 - section_name_len, "", BBS_current_section_name);
+	prints("\033[1;44;33m%s\033[37m%*s\033[33m%*s\033[m",
+		   str_left_f, 44 - str_left_len, str_middle_f, 36, str_right_f);
 
 	return 0;
 }
@@ -459,21 +473,21 @@ int show_bottom(const char *msg)
 	char str_time[LINE_BUFFER_LEN];
 	time_t time_online;
 	struct tm *tm_online;
-	char msg_f[21];
-	int truncate;
+	char msg_f[LINE_BUFFER_LEN];
+	int eol;
 	int msg_len;
 	int len;
 	int len_username;
 
 	get_time_str(str_time, sizeof(str_time));
 
-	strncpy(msg_f, msg, sizeof(msg_f) - 1);
-	msg_f[sizeof(msg_f) - 1] = '\0';
-
-	len = split_line(msg_f, 20, &truncate, &msg_len);
-	if (truncate)
-	{
-		log_error("Status string is truncated\n");
+	msg_f[0] = '\0';
+	msg_len = 0;
+	if (msg != NULL)
+	{
+		strncpy(msg_f, msg, sizeof(msg_f) - 1);
+		msg_f[sizeof(msg_f) - 1] = '\0';
+		len = split_line(msg_f, 23, &eol, &msg_len);
 		msg_f[len] = '\0';
 	}
 
@@ -484,9 +498,9 @@ int show_bottom(const char *msg)
 
 	moveto(SCREEN_ROWS, 0);
 	clrtoeol();
-	prints("\033[1;44;33m[\033[36m%s\033[33m]%*s%*s帐号[\033[36m%s\033[33m]"
+	prints("\033[1;44;33m时间[\033[36m%s\033[33m]%s%*s \033[33m帐号[\033[36m%s\033[33m]"
 		   "[\033[36m%1d\033[33m天\033[36m%2d\033[33m时\033[36m%2d\033[33m分]\033[m",
-		   str_time, 21, msg_f, 9 - len_username, "", BBS_username,
+		   str_time, msg_f, 35 - msg_len - len_username, "", BBS_username,
 		   tm_online->tm_mday - 1, tm_online->tm_hour, tm_online->tm_min);
 
 	return 0;
@@ -509,7 +523,7 @@ int show_active_board()
 
 	if (p_shm == NULL)
 	{
-		if ((p_shm = get_file_shm(DATA_ACTIVE_BOARD, &data_len, &line_total, &p_data, &p_line_offsets)) == NULL)
+		if ((p_shm = get_file_shm_readonly(DATA_ACTIVE_BOARD, &data_len, &line_total, &p_data, &p_line_offsets)) == NULL)
 		{
 			log_error("get_file_shm(%s) error\n", DATA_ACTIVE_BOARD);
 			return KEY_NULL;