From e62c16c2f03e7d9d1103a8f5ba0672bd2c4a3570 Mon Sep 17 00:00:00 2001 From: Clanmaster21 Date: Mon, 21 Oct 2019 02:13:57 +0100 Subject: [PATCH] Clearer choice of constants --- apps/ed/cmd.asm | 21 ++++++--------------- 1 file changed, 6 insertions(+), 15 deletions(-) diff --git a/apps/ed/cmd.asm b/apps/ed/cmd.asm index 2a90494..98f679f 100644 --- a/apps/ed/cmd.asm +++ b/apps/ed/cmd.asm @@ -89,11 +89,8 @@ cmdParse: jr z, .dot cp '$' jr z, .eof - - ; inline parseDecimalDigit - add a, 0xc6 ; maps '0'-'9' onto 0xf6-0xff - sub 0xf6 ; maps to 0-9 and carries if not a digit - + add a, 0xff-'9' ; maps '0'-'9' onto 0xf6-0xff + sub 0xff-9 ; maps to 0-9 and carries if not a digit jr c, .notHandled ; straight number ld a, ABSOLUTE @@ -125,11 +122,8 @@ cmdParse: inc hl ; advance cmd cursor ld a, (hl) ld de, 1 ; if .pmNoSuffix - - ; inline parseDecimalDigit - add a, 0xc6 ; maps '0'-'9' onto 0xf6-0xff - sub 0xf6 ; maps to 0-9 and carries if not a digit - + add a, 0xff-'9' ; maps '0'-'9' onto 0xf6-0xff + sub 0xff-9 ; maps to 0-9 and carries if not a digit jr c, .pmNoSuffix call .parseDecimalM ; --> DE .pmNoSuffix: @@ -157,11 +151,8 @@ cmdParse: .loop: inc hl ld a, (hl) - - ; inline parseDecimalDigit - add a, 0xc6 ; maps '0'-'9' onto 0xf6-0xff - sub 0xf6 ; maps to 0-9 and carries if not a digit - + add a, 0xff-'9' ; maps '0'-'9' onto 0xf6-0xff + sub 0xff-9 ; maps to 0-9 and carries if not a digit jr nc, .loop ; We're at the first non-digit char. Let's save it because we're going ; to temporarily replace it with a null.