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C--------------------------------------------------------------------------
subroutine ftghsp(ounit,nexist,nmore,status)
C Get Header SPace
C return the number of additional keywords that will fit in the header
C
C ounit i Fortran I/O unit number
C nexist i number of keywords already present in the CHU
C nmore i number of additional keywords that will fit in header
C -1 indicates that there is no limit to the number of keywords
C status i output error status (0 = ok)
C
C written by Wm Pence, HEASARC/GSFC, June 1991
integer ounit,nexist,nmore,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
ibuff=bufnum(ounit)
nexist=(hdend(ibuff)-hdstrt(ibuff,chdu(ibuff)))/80
if (dtstrt(ibuff) .lt. 0)then
C the max size of the header has not been defined, so there
C is no limit to the number of keywords which may be written.
nmore=-1
else
nmore=(dtstrt(ibuff)-hdend(ibuff))/80-1
end if
end
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