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Diffstat (limited to '')
| -rw-r--r-- | src/syscall.asm | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/syscall.asm b/src/syscall.asm index 5b40ef0..04e9661 100644 --- a/src/syscall.asm +++ b/src/syscall.asm @@ -137,6 +137,29 @@ KGetc:: bit 7, a jr nz, .yield ld a, [rSB] ; A = serial byte + ; The link port is also the network. Skip SLIP frames (0xC0-delimited) so + ; inbound packets never surface as console input; plain bytes (an injected + ; command in headless use) still pass through. + ld b, a + ld a, [wConInSkip] + or a + jr nz, .inframe + ld a, b + cp SLIP_END + jr z, .frameopen + ld a, b ; ordinary byte -> console input + jr .done +.frameopen + ld a, 1 + ld [wConInSkip], a + jr .poll +.inframe + ld a, b + cp SLIP_END + jr nz, .poll ; still inside a frame -> discard + xor a + ld [wConInSkip], a ; frame end -> resume + jr .poll .done and a ; CF = 0 (not EOF) ret |