Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.
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# read line from keyboard into stream while also echoing to screen
# abort on stream overflow
fn read-line-from-keyboard keyboard: (addr keyboard), out: (addr stream byte), screen: (addr screen), fg: int, bg: int {
clear-stream out
$read-line-from-keyboard:loop: {
draw-cursor screen, 0x20/space
var key/eax: byte <- read-key keyboard
compare key, 0xa/newline
break-if-=
compare key, 0
loop-if-=
compare key, 8/backspace
{
break-if-!=
undo-append-byte out
draw-code-point-at-cursor-over-full-screen screen, 0x20/space, fg 0/bg # clear cursor
move-cursor-left screen
move-cursor-left screen
draw-code-point-at-cursor-over-full-screen screen, 0x20/space, fg 0/bg # clear old cursor
move-cursor-left screen
loop $read-line-from-keyboard:loop
}
var key2/eax: int <- copy key
append-byte out, key2
var c/eax: code-point <- copy key2
draw-code-point-at-cursor-over-full-screen screen, c, fg bg
loop
}
# clear cursor
draw-code-point-at-cursor-over-full-screen screen, 0x20/space, fg bg
}