ADAS Subroutine xxssxb

      SUBROUTINE XXSSXB( USRGRP , USRTYP , USREXT )
C-----------------------------------------------------------------------
C
C  ****************** FORTRAN77 SUBROUTINE: XXSSXB *********************
C
C  PURPOSE: ADAS ROUTINE - SETS UP THE DEFAULT USRGRP, USRTYP AND USREXT
C           WHICH IDENTIFY THE FILENAME AND EXTENSION TO BE READ IN
C           SUBROUTINE SSXB.  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 TYPENAME
C                     *                 DEFAULT ADAS DATA TYPENAME
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 USRGRP 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: SSXB AND MAIN PROGRAMS USING SSXB
C
C  SUBROUTINE:
C
CA 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 SUB-DIRECTORY UNDER UNIX
C                            (IF BLANK DEFAULTS TO DEFTYP)
C
C  I/O   : (C*3)  USREXT   = USREXT UNDER WHICH ADAS DATA IS STORED
C                            (IF BLANK DEFAULTS TO DEFEXT)
C
CA         (C*8)  DEFGRP   = PARAMETER = DEFAULT USER GROUP FOR ADAS
C                                        DATA SOURCE
C
CA         (C*80) DEFTYP   = PARAMETER = DEFAULT USER TYPE FOR ADAS
C                                        DATA SOURCE
C
C          (C*3)  DEFEXT   = PARAMETER = DEFAULT USER EXTENSION FOR ADAS
C                                        DATA SOURCE
C
CA         (C*8)   ADASGR   = CURRENT ADAS DATA SOURCE GROUP
C
CA         (C*80)  ADASTY   = CURRENT SUB-DIRECTORY NAME ( OPTIONAL)
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 XXSSXB WITH '?' AS INPUTS.
C
C AUTHOR:  HUGH P. SUMMERS, JET
C          K1/1/57
C          JET EXT. 4941
C
C DATE:     2/09/93
C
C UPDATES: 24/10/94  L. JALOTA (TESSELLA SUPPORT SERVICES PLC) 
C		     CHANGED VALUES OF DEFGRP,DEFTYP, DEFEXT SUITABLE
C		     FOR DEC ALPHA DIRECTORY STRUCTURE.
C UPDATE : 22/11/94  L. JALOTA  -  TIDIED UP CHARACTER LENGTH DEFINITIONS.
C
C-----------------------------------------------------------------------
      CHARACTER*3         USREXT
      CHARACTER*8         USRGRP
      CHARACTER*80        USRTYP