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C----------------------------------------------------------------------
subroutine ftpdfl(iunit,status)
C Write the Data Unit Fill values if they are not already correct
C Fill the data unit with zeros or blanks depending on the type of HDU
C from the end of the data to the end of the current FITS 2880 byte block
C iunit i fortran unit number
C status i output error status
C
C written by Wm Pence, HEASARC/GSFC, June, 1994
integer iunit,status
C COMMON BLOCK DEFINITIONS:--------------------------------------------
integer nf,nb,ne
parameter (nf = 3000)
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
integer tfield,tstart,tbcol,rowlen,tdtype,trept,tnull,scount
integer theap,nxheap
double precision tscale,tzero
common/ft0002/tfield(nb),tstart(nb),tbcol(nf),rowlen(nb),
& tdtype(nf),trept(nf),tscale(nf),tzero(nf),tnull(nf),scount(nb)
& ,theap(nb),nxheap(nb)
character*1 chbuff(2880),chfill,xdummy(2879)
common/ftheap/chbuff,chfill,xdummy
C END OF COMMON BLOCK DEFINITIONS-----------------------------------
integer ibuff,filpos,nfill,i,tstat
if (status .gt. 0)return
ibuff=bufnum(iunit)
C check if the data unit is null
if (theap(ibuff) .eq. 0)return
filpos=dtstrt(ibuff)+theap(ibuff)+scount(ibuff)
nfill=(filpos+2879)/2880*2880-filpos
C return if there are no fill bytes
if (nfill .eq. 0)return
C set the correct fill value to be checked
if (hdutyp(ibuff) .eq. 1)then
C this is an ASCII table; should be filled with blanks
chfill=char(32)
else
chfill=char(0)
end if
C move to the beginning of the fill bytes and read them
tstat=status
call ftmbyt(iunit,filpos,.true.,status)
call ftgcbf(iunit,0,nfill,chbuff,status)
if (status .gt. 0)then
C fill bytes probably haven't been written yet so have to write them
status=tstat
go to 100
end if
C check if all the fill values are correct
do 10 i=1,nfill
if (chbuff(i) .ne. chfill)go to 100
10 continue
C fill bytes were correct, so just return
return
100 continue
C fill the buffer with the correct fill value
do 20 i=1,nfill
chbuff(i)=chfill
20 continue
C move to the beginning of the fill bytes
call ftmbyt(iunit,filpos,.true.,status)
C write all the fill bytes
call ftpcbf(iunit,0,nfill,chbuff,status)
if (status .gt. 0)then
call ftpmsg('Error writing Data Unit fill bytes (FTPDFL).')
end if
end
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