ADAS Subroutine xxsszd

      SUBROUTINE XXSSZD( USRGRP , USRTYP , USREXT )
C-----------------------------------------------------------------------
C
C  ****************** FORTRAN77 SUBROUTINE: XXSSZD *********************
C
C  PURPOSE: ADAS ROUTINE - SETS UP THE DEFAULT USEGRP, USRTYP AND USREXT
C           WHICH IDENTIFY THE FILENAME AND EXTENSION TO BE READ IN
C           SUBROUTINE SSZD.  IT WORKS IN THE SAME MANNER AS XXUID WHICH
C           WHICH ALLOWS THE DEFAULT USER SPACE TO BE SET
C
C
C           USRGRP: VALUE ON INPUT  =>  USRGRP: VALUE ON OUTPUT
C
C                     ?                 CURRENT ADAS DATA GROUPNAME
C                     *                 DEFAULT ADAS DATA GROUPNAME
C                  <BLANK>              *** USRGRP VALUE NOT CHANGED ***
C                  <OTHER>              *** USRGRP VALUE NOT CHANGED ***
C
C
C           USRTYP: VALUE ON INPUT  =>  USRTYP: VALUE ON OUTPUT
C
C                     ?                 CURRENT ADAS DATA TYPEPNAME
C                     *                 DEFAULT ADAS DATA TYPEGROUPNAME
C                  <BLANK>              *** USRTYP VALUE NOT CHANGED ***
C                  <OTHER>              *** USRTYP VALUE NOT CHANGED ***
C
C
C           USREXT: VALUE ON INPUT  =>  USREXT: VALUE ON OUTPUT
C
C                     ?                 CURRENT ADAS DATA MEMBER EXTENS.
C                     *                 DEFAULT ADAS DATA MEMBER EXTENS
C                  <BLANK>              *** USREXT VALUE NOT CHANGED ***
C                  <OTHER>              *** USREXT VALUE NOT CHANGED ***
C
C         ? => QUERIES CURRENT ADAS DATA USRGRP, USRTYP OR USREXT
C              SETTING.
C         * => SETS ADAS DATA USEGRP, USRTYP OR USREXT SETTING
C              TO DEFAULT VALUE.
C   <BLANK> => SETS ADAS DATA USRGRP, USRTYP OR USREXT SETTING
C              TO DEFAULT VALUE.
C   <OTHER> => SETS ADAS DATA USRGRP, USRTYP OR USREXT SETTING
C              TO INPUT   VALUE.
C
C  CALLING PROGRAM: SSZD AND MAIN PROGRAMS USING SSZD
C
C  SUBROUTINE:
C
C I/O   : (C*8)  USRGRP   = USRGRP UNDER WHICH ADAS DATA IS STORED
C                            (IF BLANK DEFAULTS TO DEFGRP)
C
CA I/O   : (C*80) USRTYP   = OPTIONAL SUBDIRECTORY FOR FILE
C                            (IF BLANK DEFAULTS TO DEFTYP)
C
C                            (IF BLANK DEFAULTS TO DEFEXT)
C
C          (C*8)  DEFGRP   = PARAMETER = DEFAULT USER GROUP FOR ADAS
C                                        DATA SOURCE
C
CA         (C*80) DEFTYP   = OPTIONAL SUB-DIRECTORY DEFAULT IS BLANK
C                                        DATA SOURCE
C
C          (C*3)  DEFEXT   = PARAMETER = DEFAULT USER EXTENSION FOR ADAS
C                                        DATA SOURCE
C
C          (C*8)  ADASGR   = CURRENT ADAS DATA SOURCE GROUP
C
CA         (C*80) ADASTY   = OPTIONAL SUB-DIRECTORY
C
C          (C*3)  ADASEX   = CURRENT ADAS DATA SOURCE EXTENSION
C
C
C ROUTINES:
C          ROUTINE    SOURCE    BRIEF DESCRIPTION
C          ------------------------------------------------------------
C
C NOTE:
C          TO CHECK CURRENT ADAS SOURCE USRGRP, USRTYP AND USREXT
C          CALL XXSSZD WITH ?`S AS INPUTS.
C
C AUTHOR:  HUGH P. SUMMERS, JET
C          K1/1/67
C          JET EXT. 4941
C
C DATE:     2/09/93
C
C UPDATE:  L. JALOTA - 10/11/94 : MODIFIED FOR USE UNDER UNIX
C				  INCREASED STRING LENGTHS
C UPDATE:  L. JALOTA - 22/11/94 : TIDIED UP CHARACTER LENGTH DEFINITIONS.
C-----------------------------------------------------------------------
      CHARACTER*3         USREXT
      CHARACTER*8         USRGRP
      CHARACTER*80        USRTYP