numtbd.f

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C> @file
C> @brief Search for a Table B or Table D descriptor within the
C> internal DX BUFR tables

C> This subroutine searches for a descriptor within Table B and
C> Table D of the internal DX BUFR tables.
C>
C> @author J. Woollen
C> @date 2002-05-14
C>
C> @param[in] LUN -- integer: Internal I/O stream index associated
C>                   with DX BUFR tables
C> @param[in] IDN -- integer: Bit-wise representation of FXY value
C>                   for Table B or Table D descriptor
C> @param[out] NEMO -- character*(*): Mnemonic associated with IDN
C> @param[out] TAB -- character: Type associated with IDN
C>                     - 'B' = Table B descriptor
C>                     - 'D' = Table D descriptor
C> @param[out] IRET -- integer: 
C>                     - Positional index of IDN within internal
C>                       Table B, if TAB = 'B'
C>                     - Positional index of IDN within internal
C>                       Table D, if TAB = 'D'
C>                     - 0, otherwise
C>
C> <b>Program history log:</b>
C> | Date | Programmer | Comments |
C> | -----|------------|----------|
C> | 2002-05-14 | J. Woollen | Original author |
C> | 2003-11-04 | S. Bender  | Added remarks and routine interdependencies |
C> | 2003-11-04 | D. Keyser  | Unified/portable for WRF; added history documentation |
C> | 2009-04-21 | J. Ator    | Use ifxy() for more efficient searching |
C> | 2014-12-10 | J. Ator    | Use modules instead of COMMON blocks |
C>
      SUBROUTINE numtbd(LUN,IDN,NEMO,TAB,IRET)

      USE moda_tababd

      CHARACTER*(*) nemo
      CHARACTER*1   tab

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

      nemo = ' '
      iret = 0
      tab = ' '

      IF(idn.GE.ifxy('300000')) THEN

C        LOOK FOR IDN IN TABLE D
C        -----------------------

         DO i=1,ntbd(lun)
            IF(idn.EQ.idnd(i,lun)) THEN
               nemo = tabd(i,lun)(7:14)
               tab  = 'D'
               iret = i
               goto 100
            ENDIF
         ENDDO

      ELSE

C        LOOK FOR IDN IN TABLE B
C        -----------------------

         DO i=1,ntbb(lun)
            IF(idn.EQ.idnb(i,lun)) THEN
               nemo = tabb(i,lun)(7:14)
               tab  = 'B'
               iret = i
               goto 100
            ENDIF
         ENDDO

      ENDIF

C  EXIT
C  ----

100   RETURN
      END