mirror of
https://github.com/cc65/cc65.git
synced 2024-11-12 07:07:19 +00:00
42 lines
1.3 KiB
ArmAsm
42 lines
1.3 KiB
ArmAsm
;
|
|
; char cgetc (void);
|
|
;
|
|
|
|
.export _cgetc
|
|
.import cursor
|
|
.import _kbhit
|
|
|
|
.include "osic1p.inc"
|
|
.include "extzp.inc"
|
|
.include "zeropage.inc"
|
|
|
|
; Input routine, show cursor if enabled
|
|
.code
|
|
_cgetc:
|
|
ldx CHARBUF ; character in buffer available?
|
|
bne done
|
|
lda cursor ; show cursor?
|
|
beq nocursor
|
|
ldy CURS_X
|
|
lda (SCREEN_PTR),y ; fetch current character
|
|
sta tmp1 ; save it
|
|
lda #$A1 ; full white square
|
|
sta (SCREEN_PTR),y ; store at cursor position
|
|
|
|
nocursor:
|
|
jsr _kbhit ; get input character in A
|
|
tax ; save A in X, set flags
|
|
beq nocursor ; until a key is actually pressed
|
|
lda cursor
|
|
beq done ; was cursor on?
|
|
lda tmp1 ; fetch saved character
|
|
ldy CURS_X
|
|
sta (SCREEN_PTR),y ; store at cursor position
|
|
|
|
done:
|
|
lda #$00
|
|
sta CHARBUF ; empty buffer
|
|
txa ; restore saved character from X
|
|
ldx #$00 ; high byte of int return value
|
|
rts
|