--- lbbs/src/screen.c	2025/05/10 13:17:36	1.42
+++ lbbs/src/screen.c	2025/05/11 11:33:44	1.45
@@ -112,22 +112,22 @@ static int _str_input(char *buffer, int
 	for (offset = 0; offset < buf_size - 1 && buffer[offset] != '\0'; offset++)
 		;
 
-	while ((c = igetch_t(MIN(MAX_DELAY_TIME, 60))))
+	while (!SYS_server_exit && (c = igetch_t(MIN(MAX_DELAY_TIME, 60))))
 	{
 		if (c == CR)
 		{
 			igetch(1); // Cleanup remaining '\n' in the buffer
 			break;
 		}
-		if (c == KEY_TIMEOUT)
+		else if (c == KEY_TIMEOUT || c == KEY_NULL) // timeout or broken pipe
 		{
 			return -1;
 		}
-		if (c == KEY_NULL || c == LF)
+		else if (c == LF || c == '\0')
 		{
 			continue;
 		}
-		if (c == BACKSPACE)
+		else if (c == BACKSPACE)
 		{
 			if (offset > 0)
 			{
@@ -148,11 +148,11 @@ static int _str_input(char *buffer, int
 			}
 			continue;
 		}
-		if (c > 255 || iscntrl(c))
+		else if (c > 255 || iscntrl(c))
 		{
 			continue;
 		}
-		if (c > 127 && c <= 255)
+		else if (c > 127 && c <= 255)
 		{
 			if (!hz && offset + 2 > buf_size - 1) // No enough space for Chinese character
 			{
@@ -163,14 +163,17 @@ static int _str_input(char *buffer, int
 			}
 			hz = (!hz);
 		}
+
 		if (offset + 1 > buf_size - 1)
 		{
 			outc('\a');
 			iflush();
 			continue;
 		}
+
 		buffer[offset++] = (char)c;
 		buffer[offset] = '\0';
+
 		switch (echo_mode)
 		{
 		case DOECHO:
@@ -275,7 +278,7 @@ int display_file_ex(const char *filename
 	line = begin_line;
 	max_lines = screen_rows - 1;
 
-	while (loop)
+	while (!SYS_server_exit && loop)
 	{
 		if (c_line_current >= c_line_total && c_line_total <= screen_rows - 2)
 		{
@@ -310,13 +313,12 @@ int display_file_ex(const char *filename
 			iflush();
 
 			input_ok = 0;
-			while (!input_ok)
+			while (!SYS_server_exit && !input_ok)
 			{
 				ch = igetch_t(MAX_DELAY_TIME);
 				input_ok = 1;
 				switch (ch)
 				{
-				case KEY_NULL:
 				case KEY_TIMEOUT:
 					goto cleanup;
 				case KEY_UP: