ifbget.f

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C> @file
C> @brief Check whether there are any more data subsets available to be
C> read from a BUFR message.

C> This function checks whether there are any more data subsets
C> available to be read from within the BUFR message that is
C> open for reading via the most recent call to any of the
C> [message-reading subroutines](@ref hierarchy) for a specified
C> Fortran logical unit.
C>
C> @author J. Woollen
C> @date 1994-01-06
C>
C> @param[in] LUNIT -- integer: Fortran logical unit number for
C>                     BUFR file
C> @returns ifbget -- integer:
C>                     -  0 = there is at least one more data subset
C>                            to be read from the BUFR message
C>                     - -1 = there are no more data subsets
C>                            to be read from the BUFR message
C>
C> <b>Program history log:</b>
C> | Date | Programmer | Comments |
C> | -----|------------|----------|
C> | 1994-01-06 | J. Woollen | Original author |
C> | 1998-07-08 | J. Woollen | Replaced call to Cray library routine ABORT with call to new internal routine bort() |
C> | 1999-11-18 | J. Woollen | The number of BUFR files which can be opened at one time increased from 10 to 32 (necessary in order to process multiple BUFR files under the MPI) |
C> | 2014-12-10 | J. Ator | Use modules instead of COMMON blocks |
C>
      FUNCTION ifbget(LUNIT)

      USE moda_msgcwd

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

C  MAKE SURE A FILE/MESSAGE IS OPEN FOR INPUT
C  ------------------------------------------

      CALL status(lunit,lun,il,im)
      IF(il.EQ.0) goto 900
      IF(il.GT.0) goto 901
      IF(im.EQ.0) goto 902

C  SEE IF THERE IS ANOTHER SUBSET IN THE MESSAGE
C  ---------------------------------------------

      IF(nsub(lun).LT.msub(lun)) THEN
         ifbget = 0
      ELSE
         ifbget = -1
      ENDIF

C  EXITS
C  -----

      RETURN
900   CALL bort('BUFRLIB: IFBGET - INPUT BUFR FILE IS CLOSED, IT '//
     . 'MUST BE OPEN FOR INPUT')
901   CALL bort('BUFRLIB: IFBGET - INPUT BUFR FILE IS OPEN FOR '//
     . 'OUTPUT, IT MUST BE OPEN FOR INPUT')
902   CALL bort('BUFRLIB: IFBGET - A MESSAGE MUST BE OPEN IN INPUT '//
     . 'BUFR FILE, NONE ARE')
      END