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Date: Thu, 24 Dec 2015 20:24:48 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: stat() lstat() not able to read long filename with cyrillic chars?
Message-ID: <20151224192448.GB4275@calimero.vinschen.de>
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On Dec 23 20:44, Denis Corbin wrote:
> Hi,
>=20
> First, I have read the FAQ and this mailing archive :)
>=20
> Here is the problem I meet:
>=20
> In a directory are placed three files using windows 8's explorer:
> - a short Cyrillic filename "=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1.txt"
> - a long Cyrillic filename
> "=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=
=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=
=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=
=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=
=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=
=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=
=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=
=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=
=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=
=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=B1=D0=B2=D0=B0=D0=
=B1=D0=B2=D0=B0=D0=B1.txt"
> - a long Latin filename
> "abababababababababababababababababababababababababababababababababababab=
ababababababababababababababababababababababababa.txt"
>=20
>=20
> >From a C program compiled under Cygwin, I can obtain the corresponding
> filename strings using readdir_r()...
>=20
> "\320\260\320\261\320\262\320\260\320\261.txt"
> "\320\260\320\261\320\262\320\260\320\261\320\262\320\260\320\261 [snippe=
d]"
> "abababababaababababa [snipped]"
>=20
> ... but passing these strings in turn to lstat() or stat() returns 0 as
> expected for all except for the long Cyrillic filename.

NAME_MAX is 255.  On Windows this is the number of UTF-16 chars
unfortunately.  On POSIX systems (as on Cygwin) this is the number of
bytes.  Long UTF-16 strings in cyrillic take twice as much UTF-8 chars
as it has UTF-16 chars, so NAME_MAX in utf-8 cyrillics translates into
a maximum of 127 UTF-16 chars.

If you need access to UTF-16 filenames with more characters, you can
switch to a one-byte charset temporarily, e.g.

  $ LC_ALL=3Dru_RU your_app

to switch to iso-8859-5 or

  $ LC_ALL=3Dru_RU.CP1251

to switch to Windows codepage 1251.  See
https://cygwin.com/cygwin-ug-net/setup-locale.html


HTH,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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