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C----------------------------------------------------------------------
subroutine ftchdu(iunit,status)
C Close Header Data Unit
C If we have write access to the file, then close the current HDU by:
C -padding remaining space in the header with blanks
C -writing the END keyword in the CHU
C -check the data fill values, and rewrite them if not correct
C -flushing the current buffer to disk
C -recover common block space containing column descriptors
C iunit i fortran unit number
C status i output error status
C
C written by Wm Pence, HEASARC/GSFC, June, 1991
integer iunit,status
C COMMON BLOCK DEFINITIONS:--------------------------------------------
integer nb,ne
parameter (nb = 20)
parameter (ne = 200)
integer bufnum,chdu,hdutyp,maxhdu,hdstrt,hdend,nxthdr,dtstrt
integer nxtfld
logical wrmode
common/ft0001/bufnum(199),chdu(nb),hdutyp(nb),maxhdu(nb),
& wrmode(nb),hdstrt(nb,ne),hdend(nb),nxthdr(nb),dtstrt(nb),nxtfld
C END OF COMMON BLOCK DEFINITIONS-----------------------------------
integer ibuff
C ignore input status and close HDU regardless of input status value
ibuff=bufnum(iunit)
C see if we have write access to this file
if (wrmode(ibuff))then
C rewrite the header END card and the following blank fill, and
C insure that the internal data structure matches the keywords
call ftrdef(iunit,status)
C write the correct data fill values, if they are not already correct
call ftpdfl(iunit,status)
end if
C set current column name buffer as undefined
call ftrsnm
C flush the buffers holding data for this HDU
call ftflsh(ibuff,status)
C recover common block space containing column descriptors for this HDU
call ftfrcl(iunit,status)
if (status .gt. 0)then
call ftpmsg('Error while closing current HDU (FTCHDU).')
end if
end
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