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C----------------------------------------------------------------------
subroutine ftfrcl(iunit,status)
C free up space in the common blocks that contain descriptors to
C the columns in the HDU that is being closed. The various parameters
C describing each table column (e.g., starting byte address, datatype,
C tscale, tzero, etc.) are stored in 1-D arrays, and the tstart
C parameter gives the starting element number in the arrays
C for each unit number. If a table is closed, then all the
C descriptors for that table columns must be overwritten by
C shifting any descriptors that follow it in the 1-D arrays to the left.
C iunit i fortran unit number
C status i output error status
C
C written by Wm Pence, HEASARC/GSFC,May, 1995
integer iunit,status
C COMMON BLOCK DEFINITIONS:--------------------------------------------
integer nf,nb,ne
parameter (nb = 20)
parameter (nf = 3000)
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
integer tfield,tstart,tbcol,rowlen,tdtype,trept,tnull,scount
integer theap,nxheap
double precision tscale,tzero
common/ft0002/tfield(nb),tstart(nb),tbcol(nf),rowlen(nb),
& tdtype(nf),trept(nf),tscale(nf),tzero(nf),tnull(nf),scount(nb)
& ,theap(nb),nxheap(nb)
character cnull*16, cform*8
common/ft0003/cnull(nf),cform(nf)
C END OF COMMON BLOCK DEFINITIONS-----------------------------------
integer ibuff,n2shft,i,j1,j2
C ignore input status and flush columns regardless of input status value
ibuff=bufnum(iunit)
if (status .eq. -999)then
C just initialize the descriptors as undefined
tstart(ibuff)=-1
else if (tstart(ibuff) .lt. 0)then
C descriptors are already undefined; just return
else if (tfield(ibuff) .eq. 0)then
C table had no columns so just reset pointers as undefined
tstart(ibuff)=-1
dtstrt(ibuff)=-2000000000
else
C calc number of descriptors to be shifted over the recovered space
n2shft=nxtfld-(tstart(ibuff)+tfield(ibuff))
if (n2shft .gt. 0)then
j1=tstart(ibuff)
j2=j1+tfield(ibuff)
do 10 i=1,n2shft
C shift the descriptors
j1=j1+1
j2=j2+1
tbcol(j1)=tbcol(j2)
tdtype(j1)=tdtype(j2)
trept(j1)=trept(j2)
tscale(j1)=tscale(j2)
tzero(j1)=tzero(j2)
tnull(j1)=tnull(j2)
cnull(j1)=cnull(j2)
cform(j1)=cform(j2)
10 continue
end if
C update pointer to next vacant column discriptor location
nxtfld=nxtfld-tfield(ibuff)
C update starting pointer for other opened files
do 20 i=1,nb
if (tstart(i) .gt. tstart(ibuff))then
tstart(i)=tstart(i)-tfield(ibuff)
end if
20 continue
C set pointers for this unit as undefined
tstart(ibuff)=-1
dtstrt(ibuff)=-2000000000
end if
end
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