From b9a2f4a1beb2ea3c49e45f3082c0c2da2190eb64 Mon Sep 17 00:00:00 2001
From: Martin Lund <martin.lund@keep-it-simple.com>
Date: Thu, 2 Jun 2016 00:35:19 +0200
Subject: [PATCH] Added "ctrl-t c" key command to clear screen

---
 man/tio.1             | 2 ++
 src/include/tio/tty.h | 1 +
 src/tty.c             | 7 +++++++
 3 files changed, 10 insertions(+)

diff --git a/man/tio.1 b/man/tio.1
index c71ae84..e5fe51e 100644
--- a/man/tio.1
+++ b/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"
diff --git a/src/include/tio/tty.h b/src/include/tio/tty.h
index f0339a0..4438199 100644
--- a/src/include/tio/tty.h
+++ b/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
diff --git a/src/tty.c b/src/tty.c
index fccd5ff..e9354f4 100644
--- a/src/tty.c
+++ b/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);