.TITLE  BIT. (UTIL-VAX Library Routine BIT)
;-----------------------------------------------------------------------
;
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        .PSECT  UTIL_CODE,RD,NOWRT,EXE,GBL,CON,LONG
 
;  BIT: PROCEDURE (NUMBER,PRTX) BYTE PUBLIC;
;	DECLARE NUMBER BYTE, PTRX ADDRESS;
;  END BIT;
;
;  Beware that bits in this routine are numbered 0-7, where 0 is
;  the high order bit in a byte, and 7 is the low order bit!!!!
 
	.ENTRY	BIT,^M<>
	MOVZBL	4(AP),R0	; R0 <- number.
	MOVL	8(AP),R1	; R1 -> array.
	CMPB	R0,(R1)		; Check for number > max.
	BLEQU	ITS_OK
	CLRL	R0		; Return FALSE if number > max.
	RET
ITS_OK:	XORB2	#7,R0		; Reverse sense of bit # within byte.
	EXTV	R0,#1,1(R1),R0	; Extract selected bit and extend sign.
	RET			; Return TRUE or FALSE.
 
	.END