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