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C--------------------------------------------------------------------------
subroutine ftsnul(ounit,colnum,nulval,status)
C ascii table Column NULl value definition
C Define the null value for an ASCII table column.
C
C ounit i Fortran I/O unit number
C colnum i number of the column to be defined
C nulval c the string to be use to signify undefined data
C status i output error status (0 = ok)
C
C written by Wm Pence, HEASARC/GSFC, June 1991
integer ounit,colnum,status
character*(*) nulval
C COMMON BLOCK DEFINITIONS:--------------------------------------------
integer nb,ne,nf
parameter (nb = 20)
parameter (ne = 200)
parameter (nf = 3000)
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
if (status .gt. 0)return
ibuff=bufnum(ounit)
C if HDU structure is not defined then scan the header keywords
if (dtstrt(ibuff) .lt. 0)call ftrdef(ounit,status)
if (status .gt. 0)return
C test for proper HDU type
if (hdutyp(ibuff) .ne. 1)then
status=226
return
end if
if (colnum .gt. tfield(ibuff) .or. colnum .lt. 1)then
status=302
return
end if
cnull(colnum+tstart(ibuff))=nulval
end
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