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C--------------------------------------------------------------------------
subroutine ftdhdu(ounit,typhdu,status)
C delete the current HDU (as long as it is not the primary array)
C ounit i fortran output unit number
C typhdu i type of the new CHDU, after deleting the old CHDU
C status i returned error status (0=ok)
integer ounit,typhdu,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
character*1 buff(5760)
common/ftheap/buff
C END OF COMMON BLOCK DEFINITIONS:------------------------------------
integer ibuff,nhdu,nblock
if (status .gt. 0)return
C get the number of the data buffer used for this unit
ibuff=bufnum(ounit)
nhdu=chdu(ibuff)
if (nhdu .eq. 1)then
C cannot delete the primary array
status=301
return
end if
C close the CHDU first, to flush buffers and free memory
call ftchdu(ounit,status)
C how many blocks to delete?
nblock=(hdstrt(ibuff,nhdu+1)-hdstrt(ibuff,nhdu))/2880
if (nblock .lt. 1)return
C delete the blocks
call ftdblk(ounit,nblock,1,status)
if (status .gt. 0)return
C try reinitializing the CHDU, if there is one
call ftrhdu(ounit,typhdu,status)
if (status .gt. 0)then
C there is no HDU after the one we just deleted so move back one HDU
status=0
call ftcmsg
call ftgext(ounit,nhdu-1,typhdu,status)
end if
end
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