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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.
35 lines
1.0 KiB
ArmAsm
35 lines
1.0 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 08.08.1998
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;
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; void __fastcall__ cvlinexy (unsigned char x, unsigned char y, unsigned char length);
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; void __fastcall__ cvline (unsigned char length);
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;
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.export _cvlinexy, _cvline, cvlinedirect
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.import gotoxy, putchar, newline
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.include "zeropage.inc"
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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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.ifdef __APPLE2ENH__
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ldx #'|' | $80 ; Vertical line, screen code
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.else
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ldx #'!' | $80 ; Vertical line, screen code
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.endif
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cvlinedirect:
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cmp #$00 ; Is the length zero?
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beq done ; Jump if done
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sta tmp1
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: txa ; Screen code
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jsr putchar ; Write, no cursor advance
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jsr newline ; Advance cursor to next line
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dec tmp1
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bne :-
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done: rts
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