--- lbbs/src/screen.c	2025/05/06 05:31:26	1.36
+++ lbbs/src/screen.c	2025/05/06 13:34:28	1.39
@@ -101,14 +101,14 @@ void set_input_echo(int echo)
 	}
 }
 
-static int _str_input(char *buffer, int buffer_length, int echo_mode)
+static int _str_input(char *buffer, int buf_size, int echo_mode)
 {
-	int c, offset = 0, i, hz = 0;
+	int c;
+	int offset = 0;
+	int hz = 0;
 
-	for (i = 0; i < buffer_length && buffer[i] != '\0'; i++)
-	{
-		offset++;
-	}
+	buffer[buf_size - 1] = '\0';
+	for (offset = 0; offset < buf_size - 1 && buffer[offset] != '\0'; offset++);
 
 	while ((c = igetch_t(60)))
 	{
@@ -148,7 +148,7 @@ static int _str_input(char *buffer, int
 		}
 		if (c > 127 && c <= 255)
 		{
-			if (!hz && offset + 2 > buffer_length) // No enough space for Chinese character
+			if (!hz && offset + 2 > buf_size - 1) // No enough space for Chinese character
 			{
 				igetch(1); // Cleanup remaining input
 				outc('\a');
@@ -157,7 +157,7 @@ static int _str_input(char *buffer, int
 			}
 			hz = (!hz);
 		}
-		if (offset >= buffer_length)
+		if (offset + 1 > buf_size - 1)
 		{
 			outc('\a');
 			iflush();
@@ -183,13 +183,13 @@ static int _str_input(char *buffer, int
 	return offset;
 }
 
-int str_input(char *buffer, int buffer_length, int echo_mode)
+int str_input(char *buffer, int buf_size, int echo_mode)
 {
 	int len;
 
 	buffer[0] = '\0';
 
-	len = _str_input(buffer, buffer_length, echo_mode);
+	len = _str_input(buffer, buf_size, echo_mode);
 
 	prints("\r\n");
 	iflush();
@@ -197,7 +197,7 @@ int str_input(char *buffer, int buffer_l
 	return len;
 };
 
-int get_data(int row, int col, char *prompt, char *buffer, int buffer_length, int echo_mode)
+int get_data(int row, int col, char *prompt, char *buffer, int buf_size, int echo_mode)
 {
 	int len;
 
@@ -208,7 +208,7 @@ int get_data(int row, int col, char *pro
 	prints(buffer);
 	iflush();
 
-	len = _str_input(buffer, buffer_length, echo_mode);
+	len = _str_input(buffer, buf_size, echo_mode);
 
 	return len;
 }
@@ -243,6 +243,7 @@ int display_file(const char *filename)
 
 int display_file_ex(const char *filename, int begin_line, int wait)
 {
+	static int show_help = 1;
 	char buffer[LINE_BUFFER_LEN];
 	int ch = 0;
 	int input_ok, line, max_lines;
@@ -316,9 +317,9 @@ int display_file_ex(const char *filename
 					}
 					c_line_current -= line;
 					line = begin_line;
-					max_lines = begin_line + 1;
-					prints("\033[T"); // Scroll down 1 line
-					// max_lines = screen_rows - 1; // Legacy Fterm only works with this line
+					// max_lines = begin_line + 1;
+					// prints("\033[T"); // Scroll down 1 line
+					max_lines = screen_rows - 1; // Legacy Fterm only works with this line
 					break;
 				case KEY_DOWN:
 				case CR:
@@ -375,8 +376,15 @@ int display_file_ex(const char *filename
 				case '?':
 				case 'h':
 				case 'H':
+					if (!show_help)
+					{
+						break;
+					}
+
 					// Display help information
+					show_help = 0;
 					display_file_ex(DATA_READ_HELP, begin_line, 1);
+					show_help = 1;
 
 					// Refresh after display help information
 					c_line_current -= (line - 1);