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72 lines
1.4 KiB
ArmAsm
72 lines
1.4 KiB
ArmAsm
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; 2017-12-27, groepaz
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; void cpeeks (char* s, unsigned length);
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;
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.export soft80_cpeeks
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.import soft80_cpeekc, soft80_kplot, popax
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.importzp ptr1, ptr2
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.include "c64.inc"
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.include "soft80.inc"
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soft80_cpeeks:
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eor #<$FFFF ; counting a word upward is faster
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sta ptr2 ; so, we use -(length + 1)
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txa
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eor #>$FFFF
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sta ptr2+1
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jsr popax
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sta ptr1
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stx ptr1+1
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; save current cursor position
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lda CURS_X
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pha
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lda CURS_Y
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pha
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; get the string
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@lp:
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jsr soft80_cpeekc
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ldy #0
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sta (ptr1),y
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; advance cursor position
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ldy CURS_X
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ldx CURS_Y
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iny
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cpy #charsperline
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bne @sk2
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ldy #0
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inx
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@sk2:
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sty CURS_X
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stx CURS_Y
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clc
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jsr soft80_kplot
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inc ptr1
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bne @sk
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inc ptr1+1
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@sk:
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inc ptr2
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bne @lp
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inc ptr2+1
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bne @lp
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; terminate the string
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lda #0
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ldy #0
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sta (ptr1),y
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; restore the cursor position
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pla
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tax ; CURS_Y
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pla
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tay ; CURS_X
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clc
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jmp soft80_kplot
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