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C--------------------------------------------------------------------------
subroutine fthdef(ounit,moreky,status)
C Header DEFinition
C define the size of the current header unit; this simply lets
C us determine where the data unit will start
C
C ounit i Fortran I/O unit number
C moreky i number of additional keywords to reserve space for
C status i output error status (0 = ok)
C
C written by Wm Pence, HEASARC/GSFC, June 1991
integer ounit,moreky,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,mkeys
if (status .gt. 0)return
C based on the number of keywords which have already been written,
C plus the number of keywords to reserve space for, we then can
C define where the data unit should start (it must start at the
C beginning of a 2880-byte logical block).
ibuff=bufnum(ounit)
mkeys=max(moreky,0)
dtstrt(ibuff)=((hdend(ibuff)+mkeys*80)/2880+1)*2880
end
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