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zasm: adjust parseLine success condition

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De-couple "success" from "wrote something to (DE)" so that directive
parsing can be considered successful without writing to (DE).
This commit is contained in:
Virgil Dupras 2019-05-01 10:16:57 -04:00
parent a00bc8cc4b
commit 28e1ba5e26
1 changed files with 11 additions and 5 deletions
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16
apps/zasm/main.asm
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@ -9,9 +9,9 @@ main:
ld bc, 0 ; C is our written bytes counter ld bc, 0 ; C is our written bytes counter
.loop: .loop:
call parseLine call parseLine
or a ; is zero? stop jr nz, .stop
jr z, .stop ld a, c
add a, c add a, ixl
ld c, a ld c, a
call gotoNextLine call gotoNextLine
jr nz, .stop ; error? stop jr nz, .stop ; error? stop
@ -25,8 +25,9 @@ main:
#include "directive.asm" #include "directive.asm"
; Parse line in (HL), write the resulting opcode(s) in (DE) and returns the ; Parse line in (HL), write the resulting opcode(s) in (DE) and returns the
; number of written bytes in A. Advances HL where tokenization stopped and DE ; number of written bytes in IXL. Advances HL where tokenization stopped and DE
; to where we should write the next upcode. ; to where we should write the next upcode.
; Sets Z if parse was successful, unset if there was an error or EOF.
parseLine: parseLine:
push bc push bc
@ -51,9 +52,14 @@ parseLine:
call copy call copy
pop hl pop hl
call JUMP_ADDDE call JUMP_ADDDE
jr .success
.success:
ld ixl, a
xor a ; ensure Z
jr .end jr .end
.error: .error:
xor a xor ixl
call JUMP_UNSETZ
.end: .end:
pop bc pop bc
ret ret