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subroutine v2unit(k,mode,lunit,opened,ierr)
c given variable #k (scalar or string) and mode
c v2unit return a logical unit attached to corresponding file
INCLUDE '../stack.h'
c
logical opened
integer mode(2)
integer iadr,sadr
c
iadr(l)=l+l-1
sadr(l)=(l/2)+1
c
ierr=0
il=iadr(lstk(k))
if (istk(il).eq.1) then
lunit = int(stk(sadr(il+4)))
if (istk(il+1)*istk(il+2).ne.1.or.istk(il+3).ne.0.or.
$ lunit.lt.0) then
err=1
ierr=1
call error(36)
return
endif
call getfileinfo(lunit,ifa,iswap,ltype,mod,buf,lb,info)
if(info.eq.0.and.ltype.eq.2) then
call error(243)
return
endif
opened=.true.
elseif(istk(il).eq.10) then
if(istk(il+1)*istk(il+2).ne.1) then
err=1
ierr=1
call error(36)
return
endif
kk = abs(mode(1))
ifor = kk / 100
kk = kk - 100 *ifor
iacc = kk / 10
if(mode(2).eq.0.and.iacc.eq.1) then
ierr=1
call error(242)
return
endif
mn=istk(il+5)-1
call cvstr(mn,istk(il+5+istk(il+1)*istk(il+2)),buf,1)
lunit = 0
call clunit(lunit,buf(1:mn),mode)
if(err.gt.0) then
ierr=1
buf(mn+1:)=' '
call error(err)
return
endif
opened=.false.
else
err=1
ierr=1
call error(36)
return
endif
end
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