INTEGER FUNCTION LCMGDF(LUNIT,SUBSET)

C$$$  SUBPROGRAM DOCUMENTATION BLOCK
C
C SUBPROGRAM:    LCMGDF
C   PRGMMR: J. ATOR          ORG: NP20       DATE: 2009-07-09
C
C ABSTRACT: THIS FUNCTION CHECKS WHETHER AT LEAST ONE "LONG" (I.E.
C   GREATER THAN 8 BYTES) CHARACTER STRING EXISTS WITHIN THE INTERNAL
C   DICTIONARY DEFINITION FOR THE TABLE A MESSAGE TYPE GIVEN BY SUBSET.
C
C PROGRAM HISTORY LOG:
C 2009-07-09  J. ATOR    -- ORIGINAL AUTHOR
C
C USAGE:    LCMGDF (LUNIT, SUBSET)
C   INPUT ARGUMENT LIST:
C     LUNIT    - INTEGER: FORTRAN LOGICAL UNIT NUMBER ASSOCIATED WITH
C                SUBSET DEFINITION
C     SUBSET   - CHARACTER*8: TABLE A MNEMONIC FOR MESSAGE TYPE
C
C   OUTPUT ARGUMENT LIST:
C     LCMGDF   - INTEGER: RETURN CODE INDICATING WHETHER SUBSET CONTAINS
C                AT LEAST ONE "LONG" CHARACTER STRING IN ITS DEFINITION
C                  0 - NO
C                  1 - YES
C
C REMARKS:
C    THIS ROUTINE CALLS:        BORT     NEMTBA   STATUS
C    THIS ROUTINE IS CALLED BY: None
C                               Normally called only by application
C                               programs.
C
C ATTRIBUTES:
C   LANGUAGE: FORTRAN 77
C   MACHINE:  PORTABLE TO ALL PLATFORMS
C
C$$$

      INCLUDE 'bufrlib.prm'

      COMMON /BTABLES/ MAXTAB,NTAB,TAG(MAXJL),TYP(MAXJL),KNT(MAXJL),
     .                JUMP(MAXJL),LINK(MAXJL),JMPB(MAXJL),
     .                IBT(MAXJL),IRF(MAXJL),ISC(MAXJL),
     .                ITP(MAXJL),VALI(MAXJL),KNTI(MAXJL),
     .                ISEQ(MAXJL,2),JSEQ(MAXJL)

      CHARACTER*10 TAG
      CHARACTER*8  SUBSET
      CHARACTER*3  TYP

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

C     Get LUN from LUNIT.

      CALL STATUS(LUNIT,LUN,IL,IM)
      IF (IL.EQ.0) GOTO 900
 
C     Confirm that SUBSET is defined for this logical unit.

      CALL NEMTBA(LUN,SUBSET,MTYP,MSBT,INOD)

C     Check if there's a long character string in the definition.

      NTE = ISC(INOD)-INOD

      DO I = 1, NTE
        IF ( (TYP(INOD+I).EQ.'CHR') .AND. (IBT(INOD+I).GT.64) ) THEN
          LCMGDF = 1
          RETURN
        ENDIF
      ENDDO

      LCMGDF = 0

      RETURN
900   CALL BORT('BUFRLIB: LCMGDF - INPUT BUFR FILE IS CLOSED, IT MUST'//
     . ' BE OPEN')
      END