ishrdx.f

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C> @file
C> @brief Check whether two BUFR files are sharing the same DX BUFR
C> table.

C> This function determines whether the same
C> [DX BUFR Table](@ref dfbftab) is being shared between two
C> Fortran logical units.
C>
C> @author J. Ator
C> @date 2009-06-18
C>
C> @param[in]  LUD     -- integer: Internal I/O stream index associated
C>                        with first BUFR file
C> @param[in]  LUN     -- integer: Internal I/O stream index associated
C>                        with second BUFR file
C> @returns ishrdx     -- integer: Flag indicating whether the same
C>                        DX BUFR table is being shared between the
C>                        BUFR file associated with LUD and the BUFR
C>                        file associated with LUN
C>                        - 0 = No
C>                        - 1 = Yes
C>
C> <b>Program history log:</b>
C> | Date | Programmer | Comments |
C> | -----|------------|----------|
C> | 2009-06-18 | J. Ator | Original author |
C> | 2014-12-10 | J. Ator | Use modules instead of COMMON blocks |
C>
      INTEGER FUNCTION ishrdx(LUD,LUN)

      USE moda_tababd

C-----------------------------------------------------------------------
C-----------------------------------------------------------------------

C     Note that, for any I/O stream index value LUx, the MTAB(*,LUx)
C     array contains pointer indices into the internal jump/link table
C     for each of the Table A mnemonics that is currently defined for
C     that LUx value.  Thus, if all of these indices are identical for
C     two different LUx values, then the associated logical units are
C     sharing table information.

      IF ( ( ntba(lud) .GE. 1 ) .AND.
     +      ( ntba(lud) .EQ. ntba(lun) ) ) THEN
    ii = 1
    ishrdx = 1
    DO WHILE ( ( ii .LE. ntba(lud) ) .AND. ( ishrdx .EQ. 1 ) )
      IF ( ( mtab(ii,lud) .NE. 0 ) .AND.
     +      ( mtab(ii,lud) .EQ. mtab(ii,lun) ) ) THEN
        ii = ii + 1
      ELSE
        ishrdx = 0
      ENDIF
    ENDDO
      ELSE
    ishrdx = 0
      ENDIF

      RETURN
      END