Implemented newline

3 files changed, 21 insertions, 10 deletions

diff --git a/kernel/main.dats b/kernel/main.dats
index bf20c37..dfbaa49 100644
--- a/kernel/main.dats
+++ b/kernel/main.dats
@@ -3,4 +3,7 @@
 staload "kernel/writer.sats"
 dynload "kernel/writer.dats"
 
-implement main0 () = put_string("         Hello world")
+implement main0 () = (
+  put_string("         Hello world\n");
+  put_string("GOEIENDSG\n");
+  put_string("GOEIENDSG"))
diff --git a/kernel/writer.dats b/kernel/writer.dats
index 0d67129..cd6f5d7 100644
--- a/kernel/writer.dats
+++ b/kernel/writer.dats
@@ -51,14 +51,23 @@ staload WRITER = {
   end
 }
 
+
 fun put_char (c : char, writer: &writer) : void = let
   val buf = get_buffer()
   val pos = writer.position
 in
-   buf.1->[writer.position] := @{ ascii_character = c, color_code = writer.color_code};
-
-  if (pos < N - 1) then
-    writer.position := succ(pos);
+  if (c = '\n') then
+    let 
+      val new_pos = (pos /  BUFFER_WIDTH + 1) * BUFFER_WIDTH
+    in
+      if (new_pos < N) then
+        writer.position := new_pos
+    end
+  else (
+    buf.1->[writer.position] := @{ ascii_character = c, color_code = writer.color_code};
+
+    if (pos < N - 1) then
+      writer.position := succ(pos));
 
   let prval() = eat_buffer buf in () end
 end
@@ -69,8 +78,5 @@ implement put_string (str : string) : void = let
   implement string_foreach$fwork<writer> (c,env) = put_char(c,env)
   val _ =  string_foreach_env<writer> (g1ofg0(str),!p_val)
   prval() = fpf(pf)
-in 
-end
-
-
+in  end
 
diff --git a/kernel/writer.sats b/kernel/writer.sats
index e6baef5..3ccfd7b 100644
--- a/kernel/writer.sats
+++ b/kernel/writer.sats
@@ -1,4 +1,6 @@
-#define N 80 * 25
+#define BUFFER_HEIGHT 23
+#define BUFFER_WIDTH 80
+#define N BUFFER_HEIGHT * BUFFER_WIDTH
 
 datatype color =
   | Black