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About all CONIO functions offering a <...>xy variant call popa _gotoxy By providing an internal gotoxy variant that starts with a popa all those CONIO function can be shortened by 3 bytes. As soon as program calls more than one CONIO function this means an overall code size reduction.
38 lines
1.0 KiB
ArmAsm
38 lines
1.0 KiB
ArmAsm
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; Ullrich von Bassewitz, 08.08.1998
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; void cvlinexy (unsigned char x, unsigned char y, unsigned char length);
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; void cvline (unsigned char length);
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;
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.include "atari.inc"
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.export _cvlinexy, _cvline
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.import gotoxy, putchar, setcursor
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.importzp tmp1
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.ifdef __ATARI5200__
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CHRCODE = 1 ; exclamation mark
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.else
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CHRCODE = $7C ; Vertical bar
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.endif
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_cvlinexy:
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pha ; Save the length
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jsr gotoxy ; Call this one, will pop params
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pla ; Restore the length and run into _cvline
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_cvline:
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cmp #0 ; Is the length zero?
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beq L9 ; Jump if done
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sta tmp1
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L1: lda COLCRS
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pha
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lda #CHRCODE ; Vertical bar
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jsr putchar ; Write, no cursor advance
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pla
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sta COLCRS
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inc ROWCRS
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dec tmp1
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bne L1
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L9: jmp setcursor
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