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C----------------------------------------------------------------------
subroutine ftghdn(iunit,hdunum)
C return the number of the current header data unit. The
C first HDU (the primary array) is number 1.
C iunit i fortran unit number
C hdunum i returned number of the current HDU
C
C written by Wm Pence, HEASARC/GSFC, March, 1993
integer iunit,hdunum
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-----------------------------------
hdunum=chdu(bufnum(iunit))
end
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