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C--------------------------------------------------------------------------
subroutine ftdblk(ounit,nblock,hdrdat,status)
C delete 2880-byte FITS blocks at the end of the current header or data
C ounit i fortran output unit number
C nblock i number of 2880-byte blocks to be deleted
C hdrdat i delete space at end of header (0) or data (1)
C status i returned error status (0=ok)
integer ounit,nblock,hdrdat,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
character*1 buff(5760)
common/ftheap/buff
C END OF COMMON BLOCK DEFINITIONS:------------------------------------
integer ibuff,jpoint,i,tstat
if (status .gt. 0)return
C get the number of the data buffer used for this unit
ibuff=bufnum(ounit)
C get address of first block to be deleted/overwritten
if (hdrdat .eq. 0)then
jpoint=dtstrt(ibuff)-2880*nblock
else
jpoint=hdstrt(ibuff,chdu(ibuff)+1)-2880*nblock
end if
C move each block up, until we reach the end of file
10 continue
C move to the read start position
tstat=status
call ftmbyt(ounit,jpoint+nblock*2880,.false.,status)
C read one 2880-byte FITS logical record
call ftgcbf(ounit,0,2880,buff,status)
C check for end of file
if (status .eq. 107)then
status=tstat
go to 20
end if
C move back to the write start postion
call ftmbyt(ounit,jpoint,.false.,status)
C write the 2880-byte FITS logical record
call ftpcbf(ounit,0,2880,buff,status)
C check for error
if (status .gt. 0)then
call ftpmsg('Error deleting FITS blocks (FTDBLK)')
return
end if
C increment pointer to next block and loop back
jpoint=jpoint+2880
go to 10
20 continue
C now fill the last nblock blocks with zeros; initialize the buffer
do 30 i=1,2880
buff(i)=char(0)
30 continue
C move back to the write start postion
call ftmbyt(ounit,jpoint,.false.,status)
C write the 2880-byte block NBLOCK times.
do 40 i=1,nblock
call ftpcbf(ounit,0,2880,buff,status)
40 continue
if (hdrdat .eq. 0)then
C recalculate the starting location of the current data unit, if moved
dtstrt(ibuff)=dtstrt(ibuff)-2880*nblock
end if
C recalculate the starting location of all subsequent HDUs
do 50 i=chdu(ibuff)+1,maxhdu(ibuff)+1
hdstrt(ibuff,i)=hdstrt(ibuff,i)-2880*nblock
50 continue
if (status .gt. 0)then
call ftpmsg('Error deleting FITS block(s) (FTDBLK)')
end if
end
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