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C----------------------------------------------------------------------
subroutine ftgtbs(iunit,frow,fchar,nchars,svalue,status)
C read a consecutive string of characters from an ascii or binary
C table. This will span multiple rows of the table if NCHARS+FCHAR is
C greater than the length of a row.
C iunit i fortran unit number
C frow i starting row number (1st row = 1)
C fchar i starting character/byte in the row to read (1st character=1)
C nchars i number of characters/bytes to read (can span multiple rows)
C svalue c returned string of characters
C status i output error status
C
C written by Wm Pence, HEASARC/GSFC, June 1991
integer iunit,frow,fchar,nchars,status
character*(*) svalue
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 ibuff,bstart,nget
if (status .gt. 0)return
ibuff=bufnum(iunit)
C check for errors
if (nchars .le. 0)then
C zero or negative number of character requested
return
else if (frow .lt. 1)then
C error: illegal first row number
status=307
return
else if (fchar .lt. 1)then
C error: illegal starting character
status=308
return
end if
C move the i/o pointer to the start of the sequence of characters
bstart=dtstrt(ibuff)+(frow-1)*rowlen(ibuff)+fchar-1
call ftmbyt(iunit,bstart,.false.,status)
C get the string of characters, (up to the length of the input string)
if (len(svalue) .ne. 1)then
svalue=' '
nget=min(nchars,len(svalue))
else
C assume svalue was dimensioned as: character*1 svalue(nchars)
nget=nchars
end if
call ftgcbf(iunit,1,nget,svalue,status)
end
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