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Date: Fri, 25 Dec 2015 03:04:51 +0300
From: Andrey Repin <anrdaemon@yandex.ru>
Reply-To: cygwin@cygwin.com
Message-ID: <773876572.20151225030451@yandex.ru>
To: Corinna Vinschen <cygwin@cygwin.com>, cygwin@cygwin.com
Subject: Re: stat() lstat() not able to read long filename with cyrillic chars?
In-Reply-To: <20151224192448.GB4275@calimero.vinschen.de>
References: <20151223194440.5B2A98CFEA@edrusb.is-a-geek.org> <20151224192448.GB4275@calimero.vinschen.de>
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Greetings, Corinna Vinschen!

>> First, I have read the FAQ and this mailing archive :)
>> 
>> Here is the problem I meet:
>> 
>> In a directory are placed three files using windows 8's explorer:
>> - a short Cyrillic filename "абваб.txt"
>> - a long Cyrillic filename
>> "абвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабвабваб.txt"
>> - a long Latin filename
>> "ababababababababababababababababababababababababababababababababababababababababababababababababababababababababababababa.txt"
>> 
>> 
>> >From a C program compiled under Cygwin, I can obtain the corresponding
>> filename strings using readdir_r()...
>> 
>> "\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 [snipped]"
>> "abababababaababababa [snipped]"
>> 
>> ... 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.

Aren't POSIX restrictions are a bit different?
Namely 128 bytes per path element and 4096 bytes for file name?

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

>   $ LC_ALL=ru_RU your_app

> to switch to iso-8859-5 or

>   $ LC_ALL=ru_RU.CP1251

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


> HTH,
> Corinna


-- 
With best regards,
Andrey Repin
Friday, December 25, 2015 03:03:51

Sorry for my terrible english...