freebsd stable - Oct 2016 - tcsh is not handled correctly UTF-8 in arguments

tcsh called by sshd for invocation of scp: `tcsh -c scp -f ??????????.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.

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 ??????????.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 ?