posapx.f

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C> @file
C> @author WOOLLEN @date 1994-01-06
      
C> THIS SUBROUTINE READS TO THE END OF THE FILE POINTED TO BY
C>   ABS(LUNXX) AND POSITIONS IT FOR APPENDING.  THE FILE MUST HAVE
C>   ALREADY BEEN OPENED FOR OUTPUT OPERATIONS.  IF LUNXX > 0, THE FILE
C>   IS BACKSPACED BEFORE BEING POSITIONED FOR APPEND.
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> 2000-09-19  J. WOOLLEN -- MAXIMUM MESSAGE LENGTH INCREASED FROM
C>                           10,000 TO 20,000 BYTES
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); OUTPUTS
C>                           MORE COMPLETE DIAGNOSTIC INFO WHEN ROUTINE
C>                           TERMINATES ABNORMALLY
C> 2004-08-09  J. ATOR    -- MAXIMUM MESSAGE LENGTH INCREASED FROM
C>                           20,000 TO 50,000 BYTES
C> 2009-03-23  J. ATOR    -- MODIFIED TO HANDLE EMBEDDED BUFR TABLE
C>                           (DICTIONARY) MESSAGES; ADDED LUNXX < 0
C>                           OPTION TO SIMULATE POSAPN
C> 2010-05-11  J. ATOR    -- SET ISCODES TO -1 IF UNSUCCESSFUL
C> 2012-09-15  J. WOOLLEN -- MODIFIED FOR C/I/O/BUFR INTERFACE;
C>                           REPLACE FORTRAN BACKSPACE WITH C BACKBUFR
C>                           REMOVE UNECESSARY ERROR CHECKING LOGIC    
C> 2014-12-10  J. ATOR    -- USE MODULES INSTEAD OF COMMON BLOCKS
C>
C> USAGE:    CALL POSAPX (LUNXX)
C>   INPUT ARGUMENT LIST:
C>     LUNXX    - INTEGER: ABSOLUTE VALUE IS FORTRAN LOGICAL UNIT NUMBER
C>                FOR BUFR FILE (IF LUNXX < 0, THEN THE FILE IS NOT
C>                BACKSPACED BEFORE POSITIONING FOR APPEND)
C>
C>   INPUT FILES:
C>     UNIT "LUNIT" - BUFR FILE
C>
C> REMARKS:
C>    THIS ROUTINE CALLS:        BORT     IDXMSG   RDBFDX   RDMSGW
C>                               STATUS   BACKBUFR
C>    THIS ROUTINE IS CALLED BY: OPENBF
C>                               Normally not called by any application
C>                               programs.
C>
      SUBROUTINE posapx(LUNXX)
 
      USE moda_mgwa
 
C-----------------------------------------------------------------------
C-----------------------------------------------------------------------
 
      lunit = abs(lunxx)
 
      CALL status(lunit,lun,il,im)
      IF(il.EQ.0) GOTO 901
      IF(il.LT.0) GOTO 902
 
C  TRY TO READ TO THE END OF THE FILE
C  ----------------------------------
 
1     CALL rdmsgw(lunit,mgwa,ier)
      IF(ier.LT.0) RETURN
      IF(idxmsg(mgwa).EQ.1) THEN
 
C   This is an internal dictionary message that was generated by the
C   BUFR archive library software.  Backspace the file pointer and
C   then read and store all such dictionary messages (they should be
C   stored consecutively!) and reset the internal tables.
 
    CALL backbufr(lun) !BACKSPACE LUNIT
    CALL rdbfdx(lunit,lun)
 
      ENDIF
      GOTO 1
 
C  ERROR EXITS
C  -----------
 
901   CALL bort('BUFRLIB: POSAPX - INPUT BUFR FILE IS CLOSED, IT MUST'//
     . ' BE OPEN FOR OUTPUT')
902   CALL bort('BUFRLIB: POSAPX - INPUT BUFR FILE IS OPEN FOR INPUT'//
     . ', IT MUST BE OPEN FOR OUTPUT')
      END