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cc65/libsrc/conio/scrsize.s

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;
; Ullrich von Bassewitz, 08.08.1998
;
; void screensize (unsigned char* x, unsigned char* y);
;
.export _screensize
.import popsreg
.import screensize
.importzp ptr1, sreg
.proc _screensize
sta ptr1 ; Store the y pointer
stx ptr1+1
jsr popsreg ; Get the x pointer into sreg
jsr screensize ; Get screensize into X/Y
tya ; Get Y size into A
.IFP02
ldy #0
sta (ptr1),y
txa
sta (sreg),y
.ELSE
sta (ptr1)
txa
sta (sreg)
.ENDIF
rts
.endproc