ireadmg.f

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C> @file
C> @brief Read the next message from a BUFR file that was previously
C> opened for reading.
 
C> This function calls BUFRLIB subroutine readmg() and passes
C> back its return code as the function value.
C>
C> @author J. Woollen
C> @date 1994-01-06
C>
C> @param[in] LUNIT -- integer: Fortran logical unit number for BUFR file
C> @param[out] SUBSET  -- character*8: Table A mnemonic for type of BUFR
C>                        message that was read
C>                       (see [DX BUFR Tables](@ref dfbftab)
C>                        for further information about Table A mnemonics)
C> @param[out] IDATE   -- integer: date-time stored within Section 1 of
C>                        BUFR message that was read, in format of either
C>                        YYMMDDHH or YYYYMMDDHH, depending on the most
C>                        recent call to subroutine datelen()
C> @returns ireadmg -- integer:
C>                        - 0 = new BUFR message was successfully
C>                              read into internal arrays
C>                        - -1 = there are no more BUFR messages in the
C>                               file connected to logical unit LUNIT
C>
C> @remarks
C> - The use of this function allows the return code from readmg() to be
C> used as the target variable within an iterative program loop.
C>
C> <b>Program history log:</b>
C> | Date | Programmer | Comments |
C> | -----|------------|----------|
C> | 1994-01-06 | J. Woollen | Original author |
C> | 1999-11-18 | J. Woollen | Added new function entry points ireadmm and ireadibm |
C> | 2002-05-14 | J. Woollen | Removed entry points icopysb, ireadft, ireadibm, ireadmm, ireadns and ireadsb (they became separate routines in the BUFRLIB) |
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>
      FUNCTION ireadmg(LUNIT,SUBSET,IDATE)
 
      CHARACTER*8 subset
      CALL readmg(lunit,subset,idate,iret)
      ireadmg = iret
      RETURN
      END