zasm: make instr unt write directly to ioPutC

Couldn't get rid of instrUpcode though, too complicated.

apps/zasm/instr.asm

@@ -381,7 +381,7 @@ handleJPIXY:
 	ld	c, 2
 	ret
 .error:
-	xor	c
+	ld	c, 0
 	ret
 
 ; Handle the first argument of BIT. Sets Z if first argument is valid, unset it
@@ -394,7 +394,7 @@ handleBIT:
 	cp	a		; ensure Z
 	ret
 .error:
-	xor	c
+	ld	c, 0
 	call	unsetZ
 	ret
 
@@ -733,8 +733,8 @@ processArg:
 	ret
 
 ; Parse instruction specified in A (I_* const) with args in I/O and write
-; resulting opcode(s) in (instrUpcode). Returns the number of bytes written in
-; A.
+; resulting opcode(s) in I/O.
+; Sets Z on success.
 parseInstruction:
 	push	bc
 	push	hl
@@ -775,9 +775,19 @@ parseInstruction:
 	; We have our matching instruction row. We're getting pretty near our
 	; goal here!
 	call	getUpcode
+	or	a	; is zero?
+	jr	z, .error
+	ld	b, a		; save output byte count
+	ld	hl, instrUpcode
+.loopWrite:
+	ld	a, (hl)
+	call	ioPutC
+	inc	hl
+	djnz	.loopWrite
+	cp	a	; ensure Z
 	jr	.end
 .error:
-	xor	a
+	call	unsetZ
 .end:
 	pop	de
 	pop	hl

apps/zasm/main.asm

@@ -150,23 +150,7 @@ parseLine:
 
 _parseInstr:
 	ld	a, c		; I_*
-	call	parseInstruction
-	or	a	; is zero?
-	jr	z, .error
-	ld	b, a		; save output byte count
-	ld	hl, instrUpcode
-.loopInstr:
-	ld	a, (hl)
-	call	ioPutC
-	inc	hl
-	djnz	.loopInstr
-	; continue to success
-.success:
-	xor	a		; ensure Z
-	ret
-.error:
-	call	unsetZ
-	ret
+	jp	parseInstruction
 
 _parseDirec:
 	ld	a, c		; D_*