diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/programs.asm | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/programs.asm b/src/programs.asm index df2b98d..d4ae89f 100644 --- a/src/programs.asm +++ b/src/programs.asm @@ -59,8 +59,10 @@ ProgSh: ; read a line into SH_LINEBUF, echoing as we go ld hl, SH_LINEBUF .rd + push hl ; syscalls clobber HL (trap uses it to dispatch) ld c, SYS_READ rst $30 ; A = input byte + pop hl cp $0D jr z, .eol cp $0A @@ -70,7 +72,9 @@ ProgSh: ld [$FF01], a ; echo the char straight to serial ld a, $81 ld [$FF02], a - jr .rd + ld a, l + cp LOW(SH_LINEBUF) + SH_MAXLINE - 1 + jr c, .rd ; keep reading unless the buffer is full .eol ld [hl], 0 ; NUL-terminate |