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subroutine v2cunit(k,mode,fd,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 fd
character*2 mode
character*3 status
double precision w
integer iadr,sadr
c
iadr(l)=l+l-1
sadr(l)=(l/2)+1
c
ierr=0
il=iadr(lstk(k))
if(istk(il).lt.0) il=iadr(istk(il+1))
if (istk(il).eq.1) then
fd = int(stk(sadr(il+4)))
if (istk(il+1)*istk(il+2).ne.1.or.istk(il+3).ne.0.or.
$ fd .lt. 0) then
err=1
ierr=1
call error(36)
return
endif
call getfileinfo(fd,ifa,iswap,ltype,mod,buf,lb,info)
if(info.eq.1) then
err=1
ierr=1
call error(36)
elseif(info.eq.2) then
err=fd
ierr=2
call error(245)
return
elseif(info.eq.0.and.ltype.eq.1) then
c ierr=-1 line used for compatibility instead of error
ierr=-1
opened=.true.
c call error(244)
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
mn=istk(il+5)-1
buf=' '
call cvstr(mn,istk(il+5+istk(il+1)*istk(il+2)),buf,1)
call cluni0(buf(1:mn), buf(mn+2:),mn1)
lunit = 0
buf(mn+mn1+2:mn+mn1+2)=char(0)
l=lnblnk(mode)
call mopen(fd,buf(mn+2:),mode(1:l)//char(0),1,w,ierr)
if(ierr.gt.0) then
if(ierr.eq.2) then
if(mode(1:1).eq.'r') then
err=241
else
err=240
endif
elseif(ierr.eq.1) then
err=66
endif
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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