--- lbbs/src/screen.c	2025/05/04 01:44:00	1.29
+++ lbbs/src/screen.c	2025/05/05 09:30:22	1.32
@@ -104,15 +104,14 @@ void set_input_echo(int echo)
 
 static int _str_input(char *buffer, int buffer_length, int echo_mode)
 {
-	char buf[256], ch;
-	int c, offset = 0, len, loop = 1, i, hz = 0;
+	int c, offset = 0, i, hz = 0;
 
 	for (i = 0; i < buffer_length && buffer[i] != '\0'; i++)
 	{
 		offset++;
 	}
 
-	while (c = igetch_t(60))
+	while ((c = igetch_t(60)))
 	{
 		if (c == KEY_NULL || c == KEY_TIMEOUT || c == CR)
 		{
@@ -127,9 +126,19 @@ static int _str_input(char *buffer, int
 		{
 			if (offset > 0)
 			{
-				buffer[--offset] = '\0';
-				prints("\b \b");
-				//            clrtoeol ();
+				offset--;
+				if (buffer[offset] < 0 || buffer[offset] > 127)
+				{
+					prints("\033[D \033[D");
+					offset--;
+					if (offset < 0) // should not happen
+					{
+						log_error("Offset of buffer is negative\n");
+						offset = 0;
+					}
+				}
+				buffer[offset] = '\0';
+				prints("\033[D \033[D");
 				iflush();
 			}
 			continue;
@@ -140,11 +149,19 @@ static int _str_input(char *buffer, int
 		}
 		if (c > 127 && c <= 255)
 		{
+			if (!hz && offset + 2 > buffer_length) // No enough space for Chinese character
+			{
+				igetch(1); // Cleanup remaining input
+				outc('\a');
+				iflush();
+				continue;
+			}
 			hz = (!hz);
 		}
 		if (offset >= buffer_length)
 		{
 			outc('\a');
+			iflush();
 			continue;
 		}
 		buffer[offset++] = (char)c;
@@ -164,21 +181,21 @@ static int _str_input(char *buffer, int
 		}
 	}
 
-	prints("\r\n");
-	iflush();
-
 	return offset;
 }
 
 int str_input(char *buffer, int buffer_length, int echo_mode)
 {
-	int offset;
+	int len;
 
-	memset(buffer, '\0', buffer_length);
+	buffer[0] = '\0';
 
-	offset = _str_input(buffer, buffer_length, echo_mode);
+	len = _str_input(buffer, buffer_length, echo_mode);
 
-	return offset;
+	prints("\r\n");
+	iflush();
+
+	return len;
 };
 
 int get_data(int row, int col, char *prompt, char *buffer, int buffer_length, int echo_mode)
@@ -226,12 +243,10 @@ int display_file(const char *filename)
 int display_file_ex(const char *filename, int begin_line, int wait)
 {
 	char buffer[LINE_BUFFER_LEN];
-	char temp[LINE_BUFFER_LEN];
 	int ch = 0;
 	int input_ok, line, max_lines;
 	long int c_line_current = 0, c_line_total = 0;
 	FILE *fin;
-	struct stat f_stat;
 	long *p_line_offsets;
 	int len;
 	int percentile;
@@ -359,9 +374,7 @@ int display_file_ex(const char *filename
 				case 'h':
 				case 'H':
 					// Display help information
-					strcpy(temp, app_home_dir);
-					strcat(temp, "data/read_help.txt");
-					display_file_ex(temp, begin_line, 1);
+					display_file_ex(DATA_READ_HELP, begin_line, 1);
 
 					// Refresh after display help information
 					c_line_current -= (line - 1);
@@ -422,7 +435,6 @@ int show_top(char *status)
 int show_bottom(char *msg)
 {
 	char str_time[LINE_BUFFER_LEN];
-	char str_time_onine[20];
 	char buffer[LINE_BUFFER_LEN];
 	time_t time_online;
 	struct tm *tm_online;
@@ -454,11 +466,9 @@ int show_active_board()
 	int len;
 	int end_of_line;
 
-	sprintf(filename, "%sdata/active_board.txt", app_home_dir);
-
 	clrline(3, 2 + ACTIVE_BOARD_HEIGHT);
 
-	if ((fin = fopen(filename, "r")) == NULL)
+	if ((fin = fopen(DATA_ACTIVE_BOARD, "r")) == NULL)
 	{
 		log_error("Unable to open file %s\n", filename);
 		return -1;