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#include "share/atspre_staload.hats"
staload "kernel/writer.sats"
extern castfn i2u8 {n: nat} (i: int n): uint8 n
fun color_value(c : color): uint8 =
case+ c of
| Black() => i2u8 0
| Blue() => i2u8 1
| Green() => i2u8 2
| Cyan() => i2u8 3
| Red() => i2u8 4
| Magenta() => i2u8 5
| Brown() => i2u8 6
| LightGray() => i2u8 7
| DarkGray() => i2u8 8
| LightBlue() => i2u8 9
| LightGreen() => i2u8 10
| LightCyan() => i2u8 11
| LightRed() => i2u8 12
| Pink() => i2u8 13
| Yellow() => i2u8 14
| White() => i2u8 15
fun code_value(foreground: color, background:color): uint8 =
(color_value(background) << 4) lor color_value(foreground)
fun output_char(c : char, writer : !writer) : void = let
val p = writer.buffer.1
val () = p->[writer.column_position] := @{ ascii_character = c , color_code = writer.color_code }
in
()
end
%{^
#define get_vram() ((void *) 0xB8000 + 1988)
%}
extern fun get_vram():<> [l: addr] (@[screenChar][N] @ l | ptr l) = "mac#"
extern prfun eat_writer (pf: writer): void
extern castfn uint8_of {n: nat} (i: int n): uint8 n
implement print_char(c : char) : void = let
val (pf_vram | vram) = get_vram()
val writer = @{
column_position = i2sz 0,
color_code = code_value(Yellow,Black),
buffer = (pf_vram | vram)
}
in
output_char(c,writer);
let prval () = eat_writer writer in () end
end
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