From c36a3d19d2a6d7d9e64979069b57d1fed839aca0 Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Tue, 27 Oct 2015 20:47:58 +0100
Subject: [PATCH 1/2] Add and use a clear_screen function

---
 src/lib.rs        | 1 +
 src/vga_buffer.rs | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 686f2d24..5d469e52 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -25,6 +25,7 @@ mod vga_buffer;
 #[no_mangle]
 pub extern fn rust_main() {
     // ATTENTION: we have a very small stack and no guard page
+    vga_buffer::clear_screen();
     println!("Hello World{}", "!");
 
     loop{}
diff --git a/src/vga_buffer.rs b/src/vga_buffer.rs
index 6ae73ece..dee419cf 100644
--- a/src/vga_buffer.rs
+++ b/src/vga_buffer.rs
@@ -23,6 +23,12 @@ macro_rules! print {
     });
 }
 
+pub fn clear_screen() {
+    for _ in 0..BUFFER_HEIGHT {
+        println!("");
+    }
+}
+
 #[allow(dead_code)]
 #[repr(u8)]
 pub enum Color {

From e439e9eb5de5b2453f950fa5d03f43551fd9ec37 Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Tue, 27 Oct 2015 20:48:14 +0100
Subject: [PATCH 2/2] Use a byte char instead of casting

---
 src/vga_buffer.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/vga_buffer.rs b/src/vga_buffer.rs
index dee419cf..a07d05ed 100644
--- a/src/vga_buffer.rs
+++ b/src/vga_buffer.rs
@@ -91,7 +91,7 @@ impl Writer {
 
     fn clear_row(&mut self, row: usize) {
         let blank = ScreenChar {
-            ascii_character: ' ' as u8,
+            ascii_character: b' ',
             color_code: self.color_code,
         };
         self.buffer().chars[row] = [blank; BUFFER_WIDTH];