fix #461

Author: mateoconlechuga

src/fileioc/fileioc.asm

@@ -263,7 +263,9 @@ ti_IsArchived:
 	push	bc
 	push	de
 	call	util_is_slot_open
-	jp	nz, util_ret_null
+	jr	z, util_is_in_ram
+	xor	a, a
+	ret
 util_is_in_ram:
 	call	util_get_vat_ptr
 	ld	hl, (hl)
@@ -621,14 +623,14 @@ ti_GetC:
 	push	bc
 	push	de
 	call	util_is_slot_open
-	jp	nz, util_ret_neg_one
+	jr	nz, .ret_neg_one
 	call	util_get_slot_size
 	push	bc
 	call	util_get_offset
 	pop	hl
 	scf
 	sbc	hl, bc			; size-offset
-	jp	c, util_ret_neg_one
+	jr	c, .ret_neg_one
 	push	bc
 	call	util_get_data_ptr
 	ld	hl, (hl)
@@ -643,6 +645,11 @@ ti_GetC:
 	sbc	hl, hl
 	ld	l, a
 	ret
+.ret_neg_one:
+	scf
+	sbc	hl, hl
+	ld	a, l
+	ret
 
 ;-------------------------------------------------------------------------------
 ti_PutC:
@@ -661,31 +668,30 @@ ti_PutC:
 	ld	a, e
 	ld	(char_in), a
 	call	util_is_slot_open
-	jp	nz, util_ret_neg_one
+	jr	nz, .ret_neg_one
 	call	util_is_in_ram
-	jp	c, util_ret_neg_one
-_PutChar:
+	jr	c, .ret_neg_one
 	call	util_get_slot_size
 	push	bc
 	call	util_get_offset
 	pop	hl
 	or	a, a
 	sbc	hl, bc
-	jp	c, util_ret_neg_one
+	jr	c, .ret_neg_one
 	jr	nz, .no_increment
 .increment:
 	push	bc
 	inc	hl
 	ld	(resize_amount), hl
 	call	ti.EnoughMem
 	pop	bc
-	jp	c, util_ret_neg_one
+	jr	c, .ret_neg_one
 	push	bc
 	ex	de, hl
 	call	util_insert_mem
 	pop	bc
 	or	a, a
-	jp	z, util_ret_neg_one
+	jr	z, .ret_neg_one
 .no_increment:
 	call	util_get_data_ptr
 	ld	hl, (hl)
@@ -703,6 +709,11 @@ char_in := $-1
 	sbc	hl, hl
 	ld	l, a
 	ret
+.ret_neg_one:
+	scf
+	sbc	hl, hl
+	ld	a, l
+	ret
 
 ;-------------------------------------------------------------------------------
 ti_Seek:
@@ -718,14 +729,14 @@ ti_Seek:
 	ld	de, (iy + 3)
 	ld	c, (iy + 9)
 	call	util_is_slot_open
-	jp	nz, util_ret_neg_one
+	jr	nz, .ret_neg_one
 	ld	a, (iy + 6)		; origin location
 	or	a, a
 	jr	z, .seek_set
 	dec	a
 	jr	z, .seek_curr
 	dec	a
-	jp	nz, util_ret_neg_one
+	jr	nz, .ret_neg_one
 .seek_end:
 	push	de
 	call	util_get_slot_size
@@ -741,12 +752,16 @@ ti_Seek:
 	sbc	hl, de
 	push	de
 	pop	bc
-	jp	c, util_ret_neg_one
+	jr	c, .ret_neg_one
 	jp	util_set_offset
 .seek_curr:
 	push	de
 	call	util_get_offset
 	jr	.seek_set_asm
+.ret_neg_one:
+	scf
+	sbc	hl, hl
+	ret
 
 ;-------------------------------------------------------------------------------
 ti_DeleteVar:
@@ -805,13 +820,17 @@ ti_Rewind:
 	push	bc
 	push	hl
 	call	util_is_slot_open
-	jp	nz, util_ret_neg_one
+	jr	nz, .ret_neg_one
 .rewind:
 	ld	bc, 0
 	call	util_set_offset
 	or	a, a
 	sbc	hl, hl
 	ret
+	scf
+.ret_neg_one:
+	sbc	hl, hl
+	ret
 
 ;-------------------------------------------------------------------------------
 ti_Tell:
@@ -825,11 +844,14 @@ ti_Tell:
 	push	bc
 	push	hl
 	call	util_is_slot_open
-	jp	nz, util_ret_neg_one
+	jr	nz, .ret_neg_one
 	call	util_get_offset
 	push	bc
 	pop	hl
 	ret
+.ret_neg_one:
+	sbc	hl, hl
+	ret
 
 ;-------------------------------------------------------------------------------
 ti_GetSize:
@@ -843,11 +865,14 @@ ti_GetSize:
 	push	bc
 	push	hl
 	call	util_is_slot_open
-	jp	nz, util_ret_neg_one
+	jr	nz, .ret_neg_one
 	call	util_get_slot_size
 	push	bc
 	pop	hl
 	ret
+.ret_neg_one:
+	sbc	hl, hl
+	ret
 
 ;-------------------------------------------------------------------------------
 ti_Close:
@@ -1088,14 +1113,18 @@ ti_GetDataPtr:
 	push	bc
 	push	de
 	call	util_is_slot_open
-	jp	nz, util_ret_null
+	jr	nz, .ret_null
 	call	util_get_slot_size
 	inc	hl
 	push	hl
 	call	util_get_offset
 	pop	hl
 	add	hl, bc
 	ret
+.ret_null:
+	xor	a, a
+	sbc	hl, hl
+	ret
 
 ;-------------------------------------------------------------------------------
 ti_GetVATPtr:
@@ -1109,10 +1138,14 @@ ti_GetVATPtr:
 	push	bc
 	push	de
 	call	util_is_slot_open
-	jp	nz, util_ret_null
+	jr	nz, .ret_null
 	call	util_get_vat_ptr
 	ld	hl, (hl)
 	ret
+.ret_null:
+	xor	a, a
+	sbc	hl, hl
+	ret
 
 ;-------------------------------------------------------------------------------
 ti_GetName:
@@ -1345,20 +1378,23 @@ ti_RclVar:
 	ld	iy,ti.flags
 	call	util_set_var_str
 	call	ti.FindSym
-	jp	c, util_ret_neg_one_byte
+	jr	c, .ret_neg_one
 	push	af
 	call	ti.ChkInRam
 	pop	bc
 	ld	a, b
-	jp	nz, util_ret_neg_one_byte
+	jr	nz, .ret_neg_one
 	ld	iy, 0
 	add	iy, sp
 	and	a, $3f
 	sub	a, (iy + 3)		; var type
-	jp	nz, util_ret_neg_one_byte
+	jr	nz, .ret_neg_one
 	ld	hl, (iy + 9)
 	ld	(hl), de
 	ret
+.ret_neg_one:
+	ld	a,-1
+	ret
 
 ;-------------------------------------------------------------------------------
 ti_ArchiveHasRoom:
@@ -1499,7 +1535,11 @@ util_insert_mem:
 	call	ti.EnoughMem
 	pop	de
 	pop	hl
-	jr	c, util_ret_null_byte
+	jr	nc, .enough_mem
+	pop	hl
+	xor	a, a
+	ret
+.enough_mem:
 	call	ti.InsertMem
 	pop	hl
 	ld	hl, (hl)
@@ -1544,9 +1584,6 @@ util_save_size:
 util_ret_neg_one_byte:
 	ld	a, 255
 	ret
-util_ret_null_byte:
-	xor	a, a
-	ret
 
 util_ret_null_pop_ix:
 	pop	ix