invcon.f

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C> @file
C> @author WOOLLEN @date 1994-01-06
      
C> THIS FUNCTION SEARCHES A "WINDOW" (SEE BELOW REMARKS) FOR AN
C>   ELEMENT IDENTIFIED IN THE USER STRING AS A CONDITIONAL NODE (I.E. AN
C>   ELEMENT WHICH MUST MEET A CONDITION IN ORDER TO BE READ FROM OR WRITTEN TO
C>   A DATA SUBSET).  IF A CONDITIONAL ELEMENT IS FOUND AND IT CONFORMS TO THE
C>   CONDITION, THEN THE INDEX OF THE ELEMENT WITHIN THE WINDOW IS RETURNED.
C>   OTHERWISE A VALUE OF ZERO IS RETURNED.
C>
C> PROGRAM HISTORY LOG:
C> 1994-01-06  J. WOOLLEN -- ORIGINAL AUTHOR
C> 1998-07-08  J. WOOLLEN -- IMPROVED MACHINE PORTABILITY
C> 1999-11-18  J. WOOLLEN -- THE NUMBER OF BUFR FILES WHICH CAN BE
C>                           OPENED AT ONE TIME INCREASED FROM 10 TO 32
C>                           (NECESSARY IN ORDER TO PROCESS MULTIPLE
C>                           BUFR FILES UNDER THE MPI)
C> 2003-11-04  S. BENDER  -- ADDED REMARKS/BUFRLIB ROUTINE
C>                           INTERDEPENDENCIES
C> 2003-11-04  D. KEYSER  -- MAXJL (MAXIMUM NUMBER OF JUMP/LINK ENTRIES)
C>                           INCREASED FROM 15000 TO 16000 (WAS IN
C>                           VERIFICATION VERSION); UNIFIED/PORTABLE FOR
C>                           WRF; ADDED DOCUMENTATION (INCLUDING
C>                           HISTORY) (INCOMPLETE);  OUTPUTS MORE
C>                           COMPLETE DIAGNOSTIC INFO WHEN UNUSUAL
C>                           THINGS HAPPEN
C> 2009-04-21  J. ATOR    -- USE ERRWRT
C> 2010-04-27  J. WOOLLEN -- ADD DOCUMENTATION
C> 2014-12-10  J. ATOR    -- USE MODULES INSTEAD OF COMMON BLOCKS
C>
C> USAGE:    INVCON (NC, LUN, INV1, INV2)
C>   INPUT ARGUMENT LIST:
C>     NC       - INTEGER: CONDITION CODE:
C>                  1 = '=' (EQUAL)
C>                  2 = '!' (NOT EQUAL)
C>                  3 = '<' (LESS THAN)
C>                  4 = '>' (GREATER THAN)
C>     LUN      - INTEGER: I/O STREAM INDEX INTO INTERNAL MEMORY ARRAYS
C>     INV1     - INTEGER: FIRST INDEX OF WINDOW TO SEARCH
C>     INV2     - INTEGER: LAST INDEX OF WINDOW TO SEARCH
C>
C>   OUTPUT ARGUMENT LIST:
C>     INVCON   - INTEGER: INDEX WITHIN WINDOW OF CONDITIONAL NODE CONFORMING
C>                TO SPECIFIED CONDITION
C>                  0 = NONE FOUND
C>
C> REMARKS:
C>
C>    SEE THE DOCBLOCK IN BUFR ARCHIVE LIBRARY SUBROUTINE GETWIN FOR AN
C>    EXPLANATION OF "WINDOWS" WITHIN THE CONTEXT OF A BUFR DATA SUBSET.
C>
C>    THIS ROUTINE CALLS:        ERRWRT
C>    THIS ROUTINE IS CALLED BY: CONWIN
C>                               Normally not called by any application
C>                               programs.
C>
      FUNCTION invcon(NC,LUN,INV1,INV2)

      USE moda_usrint

      COMMON /usrstr/ nnod,ncon,nods(20),nodc(10),ivls(10),kons(10)
      COMMON /quiet / iprt

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

C  CHECK THE INVENTORY INTERVAL
C  ----------------------------

      IF(inv1.LE.0 .OR. inv1.GT.nval(lun)) goto 99
      IF(inv2.LE.0 .OR. inv2.GT.nval(lun)) goto 99

C  FIND AN OCCURANCE OF NODE IN THE WINDOW MEETING THIS CONDITION
C  --------------------------------------------------------------

      DO invcon=inv1,inv2
      IF(inv(invcon,lun).EQ.nodc(nc)) THEN
         IF(kons(nc).EQ.1 .AND. val(invcon,lun).EQ.ivls(nc)) goto 100
         IF(kons(nc).EQ.2 .AND. val(invcon,lun).NE.ivls(nc)) goto 100
         IF(kons(nc).EQ.3 .AND. val(invcon,lun).LT.ivls(nc)) goto 100
         IF(kons(nc).EQ.4 .AND. val(invcon,lun).GT.ivls(nc)) goto 100
      ENDIF
      ENDDO

99    invcon = 0
      IF(iprt.GE.2) THEN
      CALL errwrt('++++++++++++++BUFR ARCHIVE LIBRARY+++++++++++++++++')
      CALL errwrt('BUFRLIB: INVCON - RETURNING WITH A VALUE OF 0')
      CALL errwrt('++++++++++++++BUFR ARCHIVE LIBRARY+++++++++++++++++')
      CALL errwrt(' ')
      ENDIF

C  EXIT
C  ----

100   RETURN
      END