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C----------------------------------------------------------------------
subroutine ftcrhd(iunit,status)
C 'CReate Header Data unit'
C create, initialize, and move the i/o pointer to a new extension at
C the end of the FITS file.
C iunit i fortran unit number
C status i output error status
C
C written by Wm Pence, HEASARC/GSFC, June, 1991
integer iunit,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
if (status .gt. 0)return
C close the current HDU
call ftchdu(iunit,status)
if (status .gt. 0)return
ibuff=bufnum(iunit)
C check that we haven't exceeded the maximum allowed number of extensions
if (maxhdu(ibuff)+1 .ge. ne)then
status=301
return
end if
C move to the end of the highest known extension
call ftmbyt(iunit,hdstrt(ibuff,maxhdu(ibuff)+1),.true.,status)
C initialize various parameters about the CHDU
maxhdu(ibuff)=maxhdu(ibuff)+1
chdu(ibuff)=maxhdu(ibuff)
nxthdr(ibuff)=hdstrt(ibuff,chdu(ibuff))
C the logical location of the END record at the start of the header
hdend(ibuff)=nxthdr(ibuff)
C the data start location is undefined
dtstrt(ibuff)=-2000000000
end
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