ADAS Subroutine xxspec

      SUBROUTINE XXSPEC( USRGRP , USRTYP , USREXT )
C-----------------------------------------------------------------------
C
C  ****************** FORTRAN77 SUBROUTINE: XXSPEC *********************
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 SPEC.  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 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: SPEC AND MAIN PROGRAMS USING SPEC, ADAS503
C
C  SUBROUTINE:
C
C  I/O   : (C*8)  USRGRP   = USRFIL UNDER WHICH ADAS DATA IS STORED
C                            (IF BLANK DEFAULTS TO DEFGRP)
C
CA I/O   : (C*80) USRTYP   = SUBDIRECTORY (OPTIONAL) WHERE ADAS DATA
CA		             FILE IS LOCATED. (IF BLANK DEFAULTS TO
CA			     DEFTYP)
C
C  I/O   : (C*3)  USREXT   = USREXT UNDER WHICH ADAS DATA IS STORED
C                            (IF BLANK DEFAULTS TO DEFEXT)
C
C          (C*8)  DEFGRP   = PARAMETER = DEFAULT USER GROUP FOR ADAS
C                                        DATA SOURCE
C
C          (C*80) DEFTYP   = PARAMETER = DEFAULT SUBDIRECTORY OF ADAS
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
CA         (C*80) ADASTY   = CURRENT ADAS DATA SOURCE TYPE
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 XXSPEC WITH ?`S 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 UPDATE:  L. JALOTA - 1/11/94	(TESSELLA SUPPORT SERVICES PLC)
C                      CHANGED VALUES OF DEFGRP,DEFTYP, DEFEXT SUITABLE
C                      FOR DEC ALPHA DIRECTORY STRUCTURE.
C				  
C UPDATE:  L.JALOTA - 23/11/94 : TIDIED UP STRING LENGTH DEFINITIONS.
C-----------------------------------------------------------------------
      CHARACTER*3         USREXT
      CHARACTER*8         USRGRP
      CHARACTER*80        USRTYP