nxtwin.f

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C> @file
C> @author WOOLLEN @date 1994-01-06
      
C> GIVEN INDICES WITHIN THE INTERNAL JUMP/LINK TABLE WHICH
C>   POINT TO THE START AND END OF AN "RPC" WINDOW (I.E. ITERATION OF
C>   AN 8-BIT OR 16-BIT DELAYED REPLICATION SEQUENCE), THIS SUBROUTINE
C>   COMPUTES THE START AND END INDICES OF THE NEXT WINDOW.
C>
C> PROGRAM HISTORY LOG:
C> 1994-01-06  J. WOOLLEN -- ORIGINAL AUTHOR
C> 1998-07-08  J. WOOLLEN -- REPLACED CALL TO CRAY LIBRARY ROUTINE
C>                           "ABORT" WITH CALL TO NEW INTERNAL BUFRLIB
C>                           ROUTINE "BORT"
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> 2002-05-14  J. WOOLLEN -- REMOVED OLD CRAY COMPILER DIRECTIVES
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 ROUTINE
C>                           TERMINATES ABNORMALLY
C> 2009-03-31  J. WOOLLEN -- ADDED ADDITIONAL DOCUMENTATION
C> 2009-05-07  J. ATOR    -- USE LSTJPB INSTEAD OF LSTRPC
C> 2014-12-10  J. ATOR    -- USE MODULES INSTEAD OF COMMON BLOCKS
C>
C> USAGE:    CALL NXTWIN (LUN, IWIN, JWIN)
C>   INPUT ARGUMENT LIST:
C>     LUN      - INTEGER: I/O STREAM INDEX INTO INTERNAL MEMORY ARRAYS
C>     IWIN     - INTEGER: STARTING INDEX OF CURRENT WINDOW ITERATION
C>     JWIN     - INTEGER: ENDING INDEX OF CURRENT WINDOW ITERATION
C>
C>   OUTPUT ARGUMENT LIST:
C>     IWIN     - INTEGER: STARTING INDEX OF NEXT WINDOW ITERATION
C>     JWIN     - INTEGER: ENDING INDEX OF NEXT WINDOW ITERATION
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:        BORT     LSTJPB
C>    THIS ROUTINE IS CALLED BY: UFBEVN   UFBIN3   UFBRW
C>                               Normally not called by any application
C>                               programs.
C>
      SUBROUTINE nxtwin(LUN,IWIN,JWIN)

      USE moda_usrint

      CHARACTER*128 bort_str

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

      IF(jwin.EQ.nval(lun)) THEN
         iwin = 0
         goto 100
      ENDIF

C  FIND THE NEXT SEQUENTIAL WINDOW
C  -------------------------------

      node = inv(iwin,lun)
      IF(lstjpb(node,lun,'RPC').NE.node) goto 900
      IF(val(jwin,lun).EQ.0) THEN
         iwin = 0
      ELSE
         iwin = jwin
         jwin = iwin+val(iwin,lun)
      ENDIF

C  EXITS
C  -----

100   RETURN
900   WRITE(bort_str,'("BUFRLIB: NXTWIN - LSTJPB FOR NODE",I6," '//
     . '(LSTJPB=",I5,") DOES NOT EQUAL VALUE OF NODE, NOT RPC (IWIN '//
     . '=",I8,")")') node,lstjpb(node,lun,'RPC'),iwin
      CALL bort(bort_str)
      END