;
;	AUTHOR:
;		R. STODOLA
;		THE INSTITUTE FOR CANCER RESEARCH
;		7701 BURHOLME AVE.
;		PHILADELPHIA, PA.  19111
;
;      *******************************************************
;      *                                                     *
;      *      THIS SOFTWARE WAS DEVELOPED WITH SUPPORT       *
;      *      FROM THE NATIONAL INSTITUTES OF HEALTH:        *
;      *         NIH CA06927                                 *
;      *         NIH CA22780                                 *
;      *                                                     *
;      *      DIRECT INQUIRIES TO:                           *
;      *            COMPUTER CENTER                          *
;      *            THE INSTITUTE FOR CANCER RESEARCH        *
;      *            7701 BURHOLME AVENUE                     *
;      *            PHILADELPHIA, PENNSYLVANIA   19111       *
;      *                                                     *
;      *      NO WARRANTY OR REPRESENTATION, EXPRESS OR      *
;      *      IMPLIED, IS MADE WITH RESPECT TO THE           *
;      *      CORRECTNESS, COMPLETENESS, OR USEFULNESS       *
;      *      OF THIS SOFTWARE, NOR THAT USE OF THIS         *
;      *      SOFTWARE MIGHT NOT INFRINGE PRIVATELY          *
;      *      OWNED RIGHTS.                                  *
;      *                                                     *
;      *      NO LIABILITY IS ASSUMED WITH RESPECT TO        *
;      *      THE USE OF, OR FOR DAMAGES RESULTING FROM      *
;      *      THE USE OF THIS SOFTWARE                       *
;      *                                                     *
;      *******************************************************
;      *                                                     *
;      *      THIS SOFTWARE WAS DESIGNED FOR USE ON A        *
;      *      PDP-11/70 OPERATING UNDER IAS V2.0 USING       *
;      *      THE IAS PDP-11 MACRO ASSEMBLER.                *
;      *                                                     *
;      *******************************************************
	.TITLE	CHAIN 	-- DECLARE A CHAIN TASK.
	.IDENT	/ICR001/
	.MCALL	ERBLDF,CHKARG
;
ERM=13.
ERB:	ERBLDF	CHAIN,ERM,3,FATAL
;
SDB:	SDBDF$	,,0,ERB+E..ESB
;
CTDB:	CDBDF$	,,,ERB+E..ESB
;
CHAIN::
	MOV	#ERB,R4			;SET ERROR BLOCK.
	CALL	.CERR.			;INITIALIZE.
	MOV	2(R5),R2		;COUNT LENGTH OF STRING
	CLR	R1
L1:	TSTB	(R2)+
	BEQ	L2
	INC	R1
	BR	L1
L2:	CLR	R3			;DETERMINE WHETHER TO SEND MESSAGE.
	CHKARG	2,L3			;SKIP IF NO MESSAGE
	MOV	4(R5),T.SNDA+SDB	;SAVE MESSAGE ADDRESS.
	MOV	#SDB,R3			;SET TO SEND MESSAGE.
L3:	CHN$T	#CTDB,2(R5),R1,#TS.USE,R3,,.STER.
	RETURN
	.END