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C----------------------------------------------------------------------
subroutine ftgcl(iunit,colnum,frow,felem,nelem,lray,status)
C read an array of logical values from a specified column of the table.
C The binary table column being read from must have datatype 'L'
C and no datatype conversion will be perform if it is not.
C This routine ignores any undefined values in the logical array.
C iunit i fortran unit number
C colnum i number of the column to read
C frow i first row to read
C felem i first element within the row to read
C nelem i number of elements to read
C lray l returned array of data values that is read
C status i output error status
C
C written by Wm Pence, HEASARC/GSFC, June 1991
integer iunit,colnum,frow,felem,nelem,status
logical lray(*)
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)
C END OF COMMON BLOCK DEFINITIONS-----------------------------------
integer bstart,maxpix,offset,tcode
integer ibuff,i,i1,ntodo,itodo,repeat,rstart,estart
character*1 buffer(80)
logical descrp
character crow*9,cp1*9,cp2*9,ccol*4
if (status .gt. 0)return
ibuff=bufnum(iunit)
tcode=tdtype(colnum+tstart(ibuff))
C check for zero length array
if (nelem .le. 0)then
return
else if (frow .lt. 1)then
C error: illegal first row number
write(crow,2000)frow
2000 format(i9)
call ftpmsg('Starting row number for table read '//
& 'request is out of range:'//crow//' (FTGCL).')
status=307
return
else if (felem .lt. 1)then
C illegal element number
status=308
write(crow,2000)felem
call ftpmsg('Starting element number for read '//
& 'request is out of range:'//crow//' (FTGCL).')
return
end if
i1=0
ntodo=nelem
rstart=frow-1
estart=felem-1
maxpix=80
if (tcode .eq. 14)then
repeat=trept(colnum+tstart(ibuff))
if (felem .gt. repeat)then
C illegal element number
status=308
write(crow,2000)felem
call ftpmsg('Starting element number for read '//
& 'request is out of range:'//crow//' (FTGCL).')
return
end if
descrp=.false.
else if (tcode .eq. -14)then
C this is a variable length descriptor column
descrp=.true.
C read the number of elements and the starting offset:
call ftgdes(iunit,colnum,frow,repeat,
& offset,status)
if (repeat .eq. 0)then
C error: null length vector
status=318
return
else if (estart+ntodo .gt. repeat)then
C error: trying to read beyond end of record
status=319
return
end if
C move the i/o pointer to the start of the pixel sequence
bstart=dtstrt(ibuff)+offset+
& theap(ibuff)+estart
call ftmbyt(iunit,bstart,.true.,status)
else
C column must be logical data type
status=312
return
end if
C process as many contiguous pixels as possible
20 itodo=min(ntodo,repeat-estart,maxpix)
if (.not. descrp)then
C move the i/o pointer to the start of the sequence of pixels
bstart=dtstrt(ibuff)+rstart*rowlen(ibuff)+
& tbcol(colnum+tstart(ibuff))+estart
call ftmbyt(iunit,bstart,.false.,status)
end if
C get the array of logical bytes
call ftgcbf(iunit,1,itodo,buffer,status)
C decode the 'T' and 'F' characters,
do 10 i=1,itodo
if (buffer(i) .eq. 'T')then
lray(i1+i)=.true.
else if (buffer(i) .eq. 'F')then
lray(i1+i)=.false.
else if (ichar(buffer(i)) .eq. 0)then
C ignore null values; leave input logical value unchanged
else
C illegal logical value
status=316
return
end if
10 continue
if (status .gt. 0)then
write(ccol,2001)colnum
2001 format(i4)
if (descrp)then
C this is a variable length descriptor column
write(crow,2000)frow
write(cp1,2000)felem+i1-1
write(cp2,2000)felem+i1+itodo-2
call ftpmsg('Error reading elements'//cp1//' to'//cp2
& //' in row'//crow)
call ftpmsg(' of variable length vector column'//ccol
& //' (FTGCLB.')
else if (trept(colnum+tstart(ibuff)) .eq. 1)then
C this is not a vector column (simple case)
write(cp1,2000)frow+i1-1
write(cp2,2000)frow+i1+itodo-2
call ftpmsg('Error reading rows'//cp1//' to'//cp2
& //' of column'//ccol//' (FTGCLB).')
else
C this is a vector column (more complicated case)
write(crow,2000)rstart+1
write(cp1,2000)estart+1
write(cp2,2000)itodo
call ftpmsg('Error reading'//cp2//' elements from'
& //' column'//ccol)
call ftpmsg(' starting at row'//crow
& //', element'//cp1//' (FTGCLB).')
end if
return
end if
C find number of pixels left to do, and quit if none left
ntodo=ntodo-itodo
if (ntodo .gt. 0)then
C increment the pointers
i1=i1+itodo
estart=estart+itodo
if (estart .eq. repeat)then
estart=0
rstart=rstart+1
end if
go to 20
end if
end
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