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C--------------------------------------------------------------------------
subroutine ftdrec(ounit,pos,status)
C delete keyword record at position POS from header
C
C ounit i fortran output unit number
C pos i position of keyword to be deleted (1 = first keyword)
C OUTPUT PARAMETERS
C status i output error status (0 = ok)
C
C written by Wm Pence, HEASARC/GSFC, Jan 1995
integer ounit,pos,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:------- -----------------------------
character*80 keybuf,keytmp
integer ibuff,i,j,nshift
if (status .gt. 0)return
C get the number of the data buffer used for this unit
ibuff=bufnum(ounit)
if (pos .lt. 1 .or. pos .gt.
& (hdend(ibuff)-hdstrt(ibuff,chdu(ibuff)))/80)then
status=203
return
end if
nxthdr(ibuff)=hdstrt(ibuff,chdu(ibuff))+(pos-1)*80
C calculate number of header records following the deleted record
nshift=(hdend(ibuff)-nxthdr(ibuff))/80
C go through header shifting each 80 byte record up one place to
C fill in the gap created by the deleted keyword
j=hdend(ibuff)
keybuf=' '
do 10 i=1,nshift
j=j-80
C read current record contents
call ftmbyt(ounit,j,.false.,status)
call ftgcbf(ounit,0,80,keytmp,status)
C overwrite with new contents
call ftmbyt(ounit,j,.false.,status)
call ftpcbf(ounit,0,80,keybuf,status)
keybuf=keytmp
10 continue
C update end-of-header pointer
hdend(ibuff)=hdend(ibuff)-80
100 continue
end
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