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C--------------------------------------------------------------------------
subroutine ftrdef(ounit,status)
C ReDEFine the structure of a data unit. This routine re-reads
C the CHDU header keywords to determine the structure and length of the
C current data unit. This redefines the start of the next HDU.
C
C ounit i Fortran I/O unit number
C status i output error status (0 = ok)
C
C written by Wm Pence, HEASARC/GSFC, Oct 1993
integer ounit,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,dummy
if (status .gt. 0)return
ibuff=bufnum(ounit)
C see if we have write access to this file (no need to go on, if not)
if (wrmode(ibuff))then
C rewrite the header END card, and following blank fill
call ftwend(ounit,status)
if (status .gt. 0)return
C now re-read the required keywords to determine the structure
call ftrhdu(ounit,dummy,status)
end if
end
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