.MCALL	.MODULE
.MODULE	LEN,VERSION=03,COMMENT=<LEN/SYSLIB>,IDENT=NO,LIB=YES

; Copyright (c) 1998 by Mentec, Inc., Nashua, NH.
; All rights reserved
;
; This software is furnished under a license for use only on a
; single computer system and  may  be  copied  only  with  the
; inclusion of the above copyright notice.  This software,  or
; any other copies thereof, may not be provided  or  otherwise
; made available to any other person except for  use  on  such
; system and to one who agrees to these license  terms.  Title
; to  and  ownership of the software shall at all times remain
; in Mentec, Inc.
;
; The information in this document is subject to change without
; notice and should not be construed as a commitment by Digital
; Equipment Corporation, or Mentec, Inc.
;
; Digital and Mentec  assume  no  responsibility for the use or
; reliability of its software on equipment which is not supplied
; by Digital  or Mentec,  and listed  in the  Software  Product
; Description.
.SBTTL	LEN - FORTRAN CALLABLE SUBROUTINE
;
;	I = LEN(A)
;
; THIS FUNCTION RETURNS THE LENGTH IN CHARACTERS OF THE STRING
; CURRENTLY CONTAINED IN ARRAY A.  THE LENGTH IS COMPUTED AS THE
; NUMBER OF NON-ZERO BYTES ENCOUNTERED BEFORE THE FIRST NULL
; (ZERO) BYTE.
;
; MAS

.PSECT	SYS$I

.GLOBL	$SYSLB

LEN::	TST	(R5)+		;SKIP # OF ARGS
	MOV	@R5,R0		;GET STRING POINTER
10$:	TSTB	(R0)+		;FIND END OF STRING
	BNE	10$		;LOOP UNTIL NULL BYTE
	DEC	R0		;BACK UP
	SUB	@R5,R0		;CALC NUMBER OF CHARS IN STRING
	RETURN

.END