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#define BUFFER_HEIGHT 23
#define BUFFER_WIDTH 80
#define N BUFFER_HEIGHT * BUFFER_WIDTH
datatype color =
| Black
| Blue
| Green
| Cyan
| Red
| Magenta
| Brown
| LightGray
| DarkGray
| LightBlue
| LightGreen
| LightCyan
| LightRed
| Pink
| Yellow
| White
typedef screenChar = @{ ascii_character = char, color_code = uint8}
vtypedef buffer = [l : agz] (@[screenChar][N] @ l | ptr l)
typedef writer = @{position = [a:int | a >= 0 && a < N] int (a), color_code = uint8}
castfn i2u8 {n: nat} (i: int n): uint8 n
fun put_string (str : string) : void
fun clear_screen() : void
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