Added "ctrl-t c" key command to clear screen

man/tio.1

@@ -70,6 +70,8 @@ Display help.
 In session, the following key sequences are intercepted as tio commands:
 .IP "\fBctrl-t ?"
 List available key commands
+.IP "\fBctrl-t c"
+Clear screen
 .IP "\fBctrl-t i"
 Show settings information (baudrate, databits, etc.)
 .IP "\fBctrl-t q"

src/include/tio/tty.h

@@ -23,6 +23,7 @@
 #define TTY_H
 
 #define KEY_QUESTION 0x3f
+#define KEY_C 0x63
 #define KEY_I 0x69
 #define KEY_Q 0x71
 #define KEY_S 0x73

src/tty.c

@@ -21,6 +21,7 @@
 
 #include "config.h"
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
 #include <stdlib.h>
@@ -63,6 +64,7 @@ void handle_command_sequence(char input_char, char previous_char, char *output_c
 {
     char unused_char;
     bool unused_bool;
+    int __attribute__((unused)) status;
 
     /* Ignore unused arguments */
     if (output_char == NULL)
@@ -79,12 +81,17 @@ void handle_command_sequence(char input_char, char previous_char, char *output_c
             case KEY_QUESTION:
                 tio_printf("Key commands:");
                 tio_printf(" ctrl-t ?   List available key commands");
+                tio_printf(" ctrl-t c   Clear screen");
                 tio_printf(" ctrl-t i   Show settings information");
                 tio_printf(" ctrl-t q   Quit");
                 tio_printf(" ctrl-t s   Show statistics");
                 tio_printf(" ctrl-t t   Send ctrl-t key code");
                 *forward = false;
                 break;
+            case KEY_C:
+                status = system("clear");
+                 *forward = false;
+                break;
             case KEY_I:
                 tio_printf("Settings information:");
                 tio_printf(" TTY device: %s", option.tty_device);