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Trailing-Edge - PDP-10 Archives - decuslib20-03 - decus/20-0078/libsim/upto.mac
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COMMENT & SIMULA specification;
OPTIONS(/EXTERN:QUICK,upto);

TEXT PROCEDURE upto(t,i);
	TEXT t; INTEGER i;
!	IF i>0 THEN
!	upto :- IF i>t.Length THEN t ELSE t.Sub(1,i-1);

!&;! MACRO-10 code !;!

	TITLE	upto
	SUBTTL	Subtext before Pos=i
	SALL
	SEARCH	SIMMCR,SIMMAC
	MACINIT
	ENTRY	upto

upto:	PROC
	LF	,ZTVLNG(XTAC)	;! t.Length
	SOSG	X1,2(XTAC)	;! i-1
	SETZB	X1,(XTAC)	;! NOTEXT if i<1
	IF	;! i>=1
		JUMPL	X1,FALSE
	THEN
		CAILE	(X1)	;! Min(t.Length,i-1)
		LI	(X1)
		MOVSM	1(XTAC)	;! to upto.Length, upto.Pos := 1
	FI
	RETURN
	EPROC
	END;