zasm: fix 3-digit hex parsing

apps/zasm/main.asm

@@ -27,6 +27,8 @@
 ; intoDE
 ; intoHL
 ; findchar
+; parseHex
+; parseHexPair
 ; blkSel
 ; fsFindFN
 ; fsOpen

apps/zasm/parse.asm

@@ -72,12 +72,21 @@ parseHexadecimal:
 	call	strlen
 	cp	3
 	jr	c, .single
+	cp	4
+	jr	c, .doubleShort	; 0x123
 	cp	5
-	jr	c, .double
+	jr	c, .double	; 0x1234
 	; too long, error
 	jr	.error
 .double:
-	call	parseHexPair	; moves HL to last char of pair
+	call	parseHexPair
+	jr	c, .error
+	inc	hl			; now HL is on first char of next pair
+	ld	ixh, a
+	jr	.single
+.doubleShort:
+	ld	a, (hl)
+	call	parseHex
 	jr	c, .error
 	inc	hl			; now HL is on first char of next pair
 	ld	ixh, a

tools/emul/zasm/glue.asm

@@ -17,6 +17,7 @@ jp	unsetZ
 jp	intoDE
 jp	intoHL
 jp	findchar
+jp	parseHex
 jp	parseHexPair
 jp	blkSel
 jp	fsFindFN

tools/emul/zasm/user.asm

@@ -7,13 +7,14 @@ unsetZ		.equ    0x0f
 intoDE		.equ    0x12
 intoHL		.equ    0x15
 findchar	.equ    0x18
-parseHexPair	.equ  0x1b
-blkSel		.equ    0x1e
-fsFindFN	.equ    0x21
-fsOpen		.equ    0x24
-fsGetC		.equ    0x27
-fsSeek		.equ    0x2a
-fsTell		.equ    0x2d
+parseHex	.equ	0x1b
+parseHexPair	.equ	0x1e
+blkSel		.equ    0x21
+fsFindFN	.equ    0x24
+fsOpen		.equ    0x27
+fsGetC		.equ    0x2a
+fsSeek		.equ    0x2d
+fsTell		.equ    0x30
 
 .equ	FS_HANDLE_SIZE	8
 .equ	STDERR_PORT	0x04

tools/tests/unit/test_parse_z.asm

@@ -16,6 +16,7 @@ testNum:	.db 1
 
 s99:		.db "99", 0
 s0x99:		.db "0x99", 0
+s0x100:		.db "0x100", 0
 s0b0101:	.db "0b0101", 0
 s0b01010101:	.db "0b01010101", 0
 sFoo:		.db "Foo", 0
@@ -35,6 +36,17 @@ test:
 	jp	nz, fail
 	call	nexttest
 
+	ld	hl, s0x100
+	call	parseLiteral
+	jp	nz, fail
+	ld	a, ixh
+	cp	1
+	jp	nz, fail
+	ld	a, ixl
+	or	a
+	jp	nz, fail
+	call	nexttest
+
 	ld	hl, sFoo
 	call	parseLiteral
 	jp	z, fail