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gethex supports backspace

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This commit is contained in:
Dagen Brock 2015-09-20 15:09:05 -05:00
parent 2d12b2971a
commit 0913a5fd89
1 changed files with 20 additions and 3 deletions
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23
src/menu.s
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@ -443,16 +443,31 @@ Menu_TypeList
rts
*** INPUT LIBRARY FOR MENU
* Pass desired length in A
GetHex sta _gethex_maxlen
GetHex
sta _gethex_maxlen
stx _gethex_resultptr
sty _gethex_resultptr+1
stz _gethex_current
lda $24
sta _gethex_screenx ;stash x. gets clobbered by RDKEY
:input jsr RDKEY
cmp #$9B ;esc = abort
bne :notesc
rts
:notesc cmp #"9"+1
:notesc cmp #$FF ;del
beq :goBack
cmp #$88
bne :notBack
:goBack
lda _gethex_current
beq :badChar ; otherwise result = -1
dec _gethex_current
dec _gethex_screenx
GOXY _gethex_screenx;$25
bra :input
:notBack cmp #"9"+1
bcs :notNum ;bge > 9
cmp #"0"
bcc :badChar ;
@ -476,6 +491,7 @@ GetHex sta _gethex_maxlen
pla
ldy _gethex_current
sta _gethex_buffer,y
inc _gethex_screenx
iny
cpy #_gethex_internalmax
bge :internalmax
@ -507,13 +523,14 @@ GetHex sta _gethex_maxlen
bcc :copyBuffer
rts
:badChar bra :input
:badChar jmp :input
_gethex_internalmax equ 8
_gethex_resultptr da 0000
_gethex_maxlen db 1
_gethex_current db 0
_gethex_buffer ds _gethex_internalmax
_gethex_screenx db 0
PrHexChar jsr HexCharForByte
HexCharForByte