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ADAS Subroutine c2chkb

C
      SUBROUTINE C2CHKB( IUNIT  , NBSEL  , IBSEL  ,
     &                   IZ0IN  , IZ0    ,
     &                   LOPEN  , IRCODE
     &                 )
C-----------------------------------------------------------------------
C
C  ****************** FORTRAN77 SUBROUTINE: C2CHKB *********************
C
C  PURPOSE: TO CHECK THE SELECTED BLOCK (IBSEL) OF DATA  EXISTS  IN  THE
C           INPUT DATA SET AND IF SO IT REPRESENTS THE ENTERED VALUES OF
C           'IZ0IN' (NUCLEAR CHARGE OF SELECTED IONISING ION ELEMENT).
C
C           IT ALSO CLOSES THE INPUT DATA SET ALLOCATION IF OPEN.
C
C  CALLING PROGRAM: SSIA
C
C  SUBROUTINE:
C
C  INPUT : (I*4)   IUNIT   = UNIT TO WHICH INPUT DATA SET IS ALLOCATED
C  INPUT : (I*4)   NBSEL   = TOTAL NUMBER OF DATA-BLOCKS READ FROM INPUT
C                            DATA SET.
C  INPUT : (I*4)   IBSEL   = INDEX OF DATA-BLOCK SELECTED FOR ANALYSIS
C
C  INPUT : (I*4)   IZ0IN   = REQUESTED: NUCLEAR CHARGE OF ELEMENT
C  INPUT : (I*4)   IZ0     = INPUT FILE: NUCLEAR CHARGE OF ELEMENT
C
C  I/O   : (L*4)   LOPEN   = INPUT : .TRUE.  => INPUT DATA SET OPEN.
C                                    .FALSE. => INPUT DATA SET CLOSED.
C                            OUTPUT: ALWAYS RETURNED AS .FALSE.
C  OUTPUT: (I*4)   IRCODE  = RETURN CODE FROM SUBROUTINE:
C                            0 => NO ERROR DETECTED.
C                            2 => DISCREPANCY BETWEEN REQUESTED ELEMENT
C                                 AND THAT IN INPUT DATA FILE.
C                            3 => SELECTED DATA-BLOCK  OUT OF RANGE  OR
C                                 DOES NOT EXIST.
C
C          (I*4)   I4UNIT  = FUNCTION (SEE ROUTINE SECTION BELOW)
C
C          (C*44)  DSNAME  = FULL MVS NAME OF DATA SET OPENED
C
C ROUTINES:
C          ROUTINE    SOURCE    BRIEF DESCRIPTION
C          ------------------------------------------------------------
C          E2FILE     ADAS      OPEN DATA SET FOR SELECTED ELEMENT
C          I4UNIT     ADAS      FETCH UNIT NUMBER FOR OUTPUT OF MESSAGES
C
C AUTHOR:  PAUL E. BRIDEN (TESSELLA SUPPORT SERVICES PLC)
C          K1/0/37
C          JET EXT. 2520
C
C DATE:    06/06/91
C
C UPDATE:  23/04/93 - PE BRIDEN - ADAS91: ADDED I4UNIT FUNCTION TO WRITE
C                                         STATEMENTS FOR SCREEN MESSAGES
C
C UPDATE:  24/05/93 - PE BRIDEN - ADAS91: CHANGED I4UNIT(0)-> I4UNIT(-1)
C
C UNIX-IDL PORT: H.P.SUMMERS
C
C VERSION: 1.1				DATE: 19-11-96
C MODIFIED: WILLIAM OSBORN (TESSELLA SUPPORT SERVICES PLC)
C	    - PUT UNDER S.C.C.S. CONTROL
C
C-----------------------------------------------------------------------
C-----------------------------------------------------------------------
C
C-----------------------------------------------------------------------
      INTEGER             IBSEL,       IRCODE,      IUNIT,       IZ0
      INTEGER             IZ0IN,       NBSEL
      LOGICAL             LOPEN
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