.MCALL	.MODULE
.MODULE	JICVT,VERSION=04,COMMENT=<JICVT/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	Module Declaration

	.NLIST
	.ENABL	LC
	.DSABL	GBL
	.NLIST	CND
	.LIST
; ++
; FACILITY:
;
;    RT-11 System Subroutine Library
;
; CALLABLE ENTRIES:
;
;    JICVT
;
; ENVIRONMENT:
;
;    This routine can be used by any job running in a single-job or 
;    multi-job environment . It uses "TRAP" to provide error processing.
;
;
; INCLUDE FILES:
;

	; SYSMAC.SML		; RT-11 system macro library.

	.MCALL	.GVAL		; GVAL programmed request.

;
; EXTERNAL REFERENCES:
;

	.GLOBL	$SYSLB		; Include system library work area.
	.GLOBL	$NXVAL		; Entry point to next value routine.
	.GLOBL	$SETR0		; Entry point to SET R0 routine
	.WEAK	$MSARG		; Trap code for missing argument


	.SBTTL	JICVT - Fortran-callable Routine
;
; ++
; FUNCTIONAL DESCRIPTION:
;
;    The JICVT function  converts an INTEGER*2 value to INTEGER*4 format.
;    
; CALLING SEQUENCE:
;
;    i = JICVT( isrc[,jres]))
;
; INPUT PARAMETERS:
;
;    R5	    -  address of JICVT's argument block
;
;    0(R5)  -  argument count of JICVT call
;    2(R5)  -  address of INTEGER*4 variable or array element whose
;              value is to be converted
;    4(R5)  -  INTEGER*2 entity to receive the conversion result
;
;
; OUTPUT PARAMETERS:
;
;   jres - INTEGER*4 converted value
;
; RETURNED FUNCTION VALUE:
;
;    i =  -1 normal return; the result is negative
;      =   0 normal return; the result is zero
;      =   1 normal return; the result is positive
;--

	.PSECT	SYS$I


JICVT::	TST	(R5)+		;SKIP COUNT ARG
	CLR	R2		;INIT SIGN EXTEND WORD
	MOV	@(R5)+,R0	;GET INTEGER VALUE
	BPL	10$		;BRANCH IF POSITIVE
	DEC	R2		;SET SIGN EXTEND WORD
10$:	MOV	@R5,R1		;ADDR OF RESULT
	MOV	R0,(R1)+	;STORE LOW ORDER
	MOV	R2,@R1		;STORE HIGH ORDER
	CLR	R0		;INITIALIZE FOR NORMAL EXIT
	CALLR	$SETR0		;EXIT VIA SETR0 ROUTINE

	.END