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ADAS Subroutine e2file

      SUBROUTINE E2FILE( IUNIT , IZ0 , IRCODE , DSNAME )
C-----------------------------------------------------------------------
C
C  ****************** FORTRAN77 SUBROUTINE: E2FILE *********************
C
C  PURPOSE: TO OPEN AN IONIZATION RATE-COEFFT 'IONELEC' DATA SET
C           BY DEFAULT, OR AN ALTERNATIVE DATA SET IF REQUIRED, FOR
C           IONIZING ION WITH NUCLEAR CHARGE 'IZ0' 
C           THIS WILL BE CONNECTED TO UNIT 'IUNIT'.
C
C   DATA SET OPENED: $ADASUSER/<DEFADF>/<GROUP>(OPTIONAL)/<TYPE>/
C			 <GROUP_EXT>#<ELEMENT SYMBOL>'
C
C  CALLING PROGRAM: SSZD
C
C  SUBROUTINE:
C
C  INPUT : (I*4)   IUNIT   = UNIT TO WHICH DATA SET WILL BE CONNECTED
C  INPUT : (I*4)   IZ0     = NUCLEAR CHARGE OF EMITTING ION REQUESTED
C
C  OUTPUT: (I*4)   IRCODE  = RETURN CODE FROM SUBROUTINE:
C                            0 => DATA SET SUCCESSFULLY CONNECTED
C                            1 => REQUESTED DATA  SET  MEMBER  DOES  NOT
C                                 EXISTS - DATA SET NOT CONNECTED.
C                            9 => REQUESTED DATA  SET  EXISTS BUT CANNOT
C                                 BE OPENED.
C  OUTPUT: (C*80)  DSNAME  = NAME OF OPENED DATA SET UNDER UNIX
C
C          (I*4)   IDLEN   = LENGTH, IN BYTES, OF FIXED 'DSNAME' PREFIX
C          (I*4)   LENF1   = FIRST NON-BLANK CHR OF 'DSNAME' GROUP PART
C          (I*4)   LENF2   = LAST  NON-BLANK CHR OF 'DSNAME' GROUP PART
C          (I*4)   LENF3   = FIRST NON-BLANK CHR OF 'DSNAME' TYPE PART
C          (I*4)   LENF4   = LAST  NON-BLANK CHR OF 'DSNAME' TYPE PART
C          (I*4)   LENF5   = LAST  NON-BLANK CHR OF 'DSNAME' USERID PART
C          (I*4)   LENF6   = LAST  NON-BLANK CHR OF 'DSNAME' USERID PART
C          (I*4)   LENF7   = LAST  NON-BLANK CHR OF 'DSNAME' EXTENSION PART
C          (I*4)   LENF8   = LAST  NON-BLANK CHR OF 'DSNAME' EXTENSION PART
CA         (C*1)   HASH    = '#'   IF NON-BLANK EXT, ELSE ' '.
C          (C*2)   XFESYM  = FUNCTION - (SEE ROUTINES SECTION BELOW)
C          (C*2)   ESYM    = ELEMENT SYMBOL FOR NUCLEAR CHARGE 'IZ0'
C          (C*3)   USREXT  = ADAS SOURCE DATA FILE EXTENSION
CA         (C*80)  USERID  = ADAS SOURCE DATA USER ID
C          (C*8)   USRGRP  = ADAS SOURCE DATA GROUPNAME
CA         (C*80)  USRTYP  = ADAS SOURCE DATA TYPENAME
C	   (C*5)   DEFADF  = DEFAULT DATA DIRECTORY, I.E. ADF13
C
C          (L*4)   LEXIST  = .TRUE.  => REQUESTED  DATA  SET  EXISTS.
C                            .FALSE. => REQUESTED  DATA  SET  DOES  NOT
C                                       EXIST.
C
C ROUTINES:
C          ROUTINE    SOURCE    BRIEF DESCRIPTION
C          ------------------------------------------------------------
C	   XXUID      ADAS      FETCHES/SETS ADAS SOURCE DATA USER ID
C          XXSSZD     ADAS      FETCHES/SETS ADAS SOURCE DATA FILENAME
C                               AND FILE EXTENSION
C          XFESYM     ADAS      CHARACTER*2 FUNCTION -
C                               GATHERS ELEMENT SYMBOL FOR NUC. CHARGE
C	   XXSLEN     ADAS      FINDS FIRST AND LAST NON-BLANK
C				CHARACTERS IN STRING.
C
C AUTHOR:  H.P. SUMMERS
C	   K1/1/57
C	   JET EXT. 4941
C DATE:    11/10/91
C
C UPDATE:  10/03/93 - PE BRIDEN: ADDED CALL TO XXUID AND USERID VARIABLE
C                                - NOW ALLOWS ANY INPUT DATASET USER ID.
C UPDATE:   2/09/93 - HPS      : ADDED CALL TO XXSSZD AND USRGRP, USRTYP
C                                  AND USREXT NAMES
C                                - NOW ALLOWS ANY INPUT DATASET FILENAME
C                                  AND EXTENSION
C UPDATE:  23/11/93 - PEB      : CORRECT ERROR - A '.' HAD MISTAKENLY
C                                BEEN PLACED BEFORE THE MEMBER NAME IN
C                                VARIABLE DSNAME.
C
C UPDATE:  10/11/94 - L. JALOTA: MODIFIED CODE FOR RUNNING UNDER UNIX
C				 USING NEW FILE NAMING CONVENTION.
C				 "ACTION" KEYWORD IN OPEN COMMAND IS IBM
C				 SO REMOVED HERE.
C 				 ADDED DEFADF 
C UPDATE:  22/11/94 - L. JALOTA: TIDIED UP CHARACTER LENGTH DEFINITIONS
C
C UPDATE:  24/03/95 - HPS      : INTRODUCED HASH TO ELIMINATE # IN FILE IF
C                                THERE IS NO EXTENSION PART OF THE FILE NAME
C                                ALTER LOGIC TO ALLOW USRTYP, USREXT TO BE A
C                                SINGLE CHARACTER.
C
C-----------------------------------------------------------------------
C-----------------------------------------------------------------------
C
C-----------------------------------------------------------------------
      CHARACTER*80        DSNAME
      INTEGER             IRCODE,      IUNIT,       IZ0
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