FUNCTION IREADMM(IMSG,SUBSET,IDATE)

C$$$  SUBPROGRAM DOCUMENTATION BLOCK
C
C SUBPROGRAM:    IREADMM
C   PRGMMR: WOOLLEN          ORG: NP20       DATE: 1999-11-18
C
C ABSTRACT: THIS FUNCTION CALLS BUFR ARCHIVE LIBRARY SUBROUTINE READMM
C   AND PASSES BACK ITS RETURN CODE.  SEE READMM FOR MORE DETAILS.
C
C PROGRAM HISTORY LOG:
C 1999-11-18  J. WOOLLEN -- ORIGINAL AUTHOR (ENTRY POINT IN IREADMG)
C 2002-05-14  J. WOOLLEN -- CHANGED FROM AN ENTRY POINT TO INCREASE
C                           PORTABILITY TO OTHER PLATFORMS
C 2003-11-04  S. BENDER  -- ADDED REMARKS/BUFRLIB ROUTINE
C                           INTERDEPENDENCIES
C 2003-11-04  D. KEYSER  -- UNIFIED/PORTABLE FOR WRF; ADDED
C                           DOCUMENTATION (INCLUDING HISTORY)
C
C USAGE:    IREADMM (IMSG, SUBSET, IDATE)
C   INPUT ARGUMENT LIST:
C     IMSG     - INTEGER: POINTER TO BUFR MESSAGE NUMBER (RECORD) IN
C                STORAGE 
C
C   OUTPUT ARGUMENT LIST:
C     SUBSET   - CHARACTER*8: TABLE A MNEMONIC FOR TYPE OF BUFR MESSAGE
C                BEING READ
C     IDATE    - INTEGER: DATE-TIME STORED WITHIN SECTION 1 OF BUFR
C                MESSAGE BEING READ, IN FORMAT OF EITHER YYMMDDHH OR
C                YYYYMMDDHH, DEPENDING ON DATELEN() VALUE
C     IREADMM  - INTEGER: RETURN CODE:
C                       0 = normal return
C                      -1 = IMSG is either 0 or greater than the
C                           number of messages in memory
C
C REMARKS:
C    THIS ROUTINE CALLS:        READMM
C    THIS ROUTINE IS CALLED BY: UFBMNS
C                               Also called by application programs.
C
C ATTRIBUTES:
C   LANGUAGE: FORTRAN 77
C   MACHINE:  PORTABLE TO ALL PLATFORMS
C
C$$$

      CHARACTER*8 SUBSET

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

      CALL READMM(IMSG,SUBSET,IDATE,IRET)
      IREADMM = IRET

      RETURN
      END