tcsh is not handled correctly UTF-8 in arguments

[Slawa Olhovchenkov]

On Thu, Oct 20, 2016 at 08:54:05AM -0600, Alan Somers wrote:

> On Wed, Oct 19, 2016 at 11:10 AM, Slawa Olhovchenkov <slw at zxy.spb.ru> wrote:
> > tcsh called by sshd for invocation of scp: `tcsh -c scp -f Расписание.pdf`
> > At this time no any LC_* is set.
> > tcsh read .cshrc and set LC_CTYPE=ru_RU.UTF-8 LC_COLLATE=ru_RU.UTF-8.
> > After this invocation of scp will be incorrect:
> >
> > 00007ab0  20 2d 66 20 c3 90 c2 a0  c3 90 c2 b0 c3 91 c2 81  | -f ............|
> > 00007ac0  c3 90 c2 bf c3 90 c2 b8  c3 91 c2 81 c3 90 c2 b0  |................|
> > 00007ad0  c3 90 c2 bd c3 90 c2 b8  c3 90 c2 b5 5f c3 90 c2  |............_...|
> > 00007ae0  a2 c3 90 c2 97 c3 90 c2  98 2e 70 64 66 0a        |..........pdf.  |
> >
> > Correct invocation must be:
> >
> > 00000000                                       20 2d 66 20  |             -f |
> > 00000010  d0 a0 d0 b0 d1 81 d0 bf  d0 b8 d1 81 d0 b0 d0 bd  |................|
> > 00000020  d0 b8 d0 b5 5f d0 a2 d0  97 d0 98 2e 70 64 66 0a  |...._.......pdf.|
> >
> > `d0` =>  `c3 90`
> > `a0` =>  `c2 a0`
> >
> > I.e. every byte re-encoded to utf-8: `d0` =>  `c3 90`
> >
> > As result imposible to access files w/ non-ascii names.
> 
> This might be related to PR213013.  Could you please try on head after r306782 ?

I think not related. PR213013 is about character classification, my
report is about unnecessary encoding shell arguments.