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C----------------------------------------------------------------------
subroutine ftghad(iunit,curhdu,nxthdu)
C return the starting byte address of the CHDU and the next HDU.
C curhdu i starting address of the CHDU
C nxthdu i starting address of the next HDU
C written by Wm Pence, HEASARC/GSFC, May, 1995
integer iunit,curhdu,nxthdu
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,hdunum
ibuff=bufnum(iunit)
hdunum=chdu(ibuff)
curhdu=hdstrt(ibuff,hdunum)
nxthdu=hdstrt(ibuff,hdunum+1)
end
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