--- lbbs/src/screen.c	2025/05/18 07:41:34	1.62
+++ lbbs/src/screen.c	2025/05/28 05:47:37	1.71
@@ -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)
@@ -48,7 +54,7 @@ void moveto(int row, int col)
 
 void clrtoeol()
 {
-	prints("\033[K");
+	prints(CTRL_SEQ_CLR_LINE);
 }
 
 void clrline(int line_begin, int line_end)
@@ -58,7 +64,7 @@ void clrline(int line_begin, int line_en
 	for (i = line_begin; i <= line_end; i++)
 	{
 		moveto(i, 0);
-		prints("\033[K");
+		prints(CTRL_SEQ_CLR_LINE);
 	}
 }
 
@@ -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;
@@ -293,7 +299,7 @@ int display_file_ex(const char *filename
 				input_ok = 1;
 				switch (ch)
 				{
-				// case KEY_NULL:
+				case KEY_NULL:
 				case KEY_TIMEOUT:
 					goto cleanup;
 				case KEY_HOME:
@@ -419,38 +425,44 @@ 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)
 {
-	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, 20, &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, BBS_current_section_name, sizeof(str_right_f) - 1);
+	str_right_f[sizeof(str_right_f) - 1] = '\0';
+	len = split_line(BBS_current_section_name, 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, 32, BBS_name, 26, "", BBS_current_section_name);
-	iflush();
+		   str_left_f, 44 - str_left_len, str_middle_f, 34 - str_middle_len - str_right_len, "", str_right_f);
 
 	return 0;
 }
@@ -486,10 +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]"
-		   "[\033[36m%1d\033[33m:\033[36m%2d\033[33m:\033[36m%2d\033[33m]\033[m",
-		   str_time, 21, msg_f, 13 - len_username, "", BBS_username,
+		   "[\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,
 		   tm_online->tm_mday - 1, tm_online->tm_hour, tm_online->tm_min);
-	iflush();
 
 	return 0;
 }
@@ -503,19 +514,32 @@ int show_active_board()
 	static const void *p_data;
 	static const long *p_line_offsets;
 
+	static time_t t_last_show = 0;
+	static int line_last = 0;
+
 	char buffer[LINE_BUFFER_LEN];
 	long int len;
 
 	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;
 		}
 	}
 
-	clrline(3, 2 + ACTIVE_BOARD_HEIGHT);
+	if (time(0) - t_last_show >= 10)
+	{
+		line_last = line_current;
+		t_last_show = time(0);
+	}
+	else
+	{
+		line_current = line_last;
+	}
+
+	clrline(2, 2 + ACTIVE_BOARD_HEIGHT);
 
 	for (int i = 0; i < ACTIVE_BOARD_HEIGHT; i++)
 	{
@@ -540,7 +564,6 @@ int show_active_board()
 			break;
 		}
 	}
-	iflush();
 
 	return 0;
 }