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X-HELO:	calimero.vinschen.de
Date:	Mon, 8 Feb 2016 14:15:43 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: cygwin_conv_ functions and character encoding
Message-ID:	<20160208131543.GB12975@calimero.vinschen.de>
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On Feb  5 16:47, Thomas Wolff wrote:
> The cygwin path conversion functions ignore the current locale;
> rather they seem to always use the locale environment set when the program
> was started, see test program convloc.c:
> [...]
> In sys_wcstombs in strfuncs.cc I see:
>   const char *charset =3D cygheap->locale.charset;
> which is set in internal_setlocale ()...
>=20
> In fact, the situation can be fixed by adding after setlocale():
>   cygwin_internal(CW_INT_SETLOCALE);  // -> internal_setlocale();
> (cf. https://sourceware.org/ml/cygwin-developers/2010-02/msg00054.html)
> but I think those functions should use the proper locale implicitly;
> according to the generic description in
> http://linux.die.net/man/3/setlocale,
> LC_CTYPE affects ... conversion ... functions, in my opinion this would
> include cygwin-specific conversion functions as well as implicitly called
> conversion (see open() below).
> The same problem applies to the open() function (involving path conversio=
n).
> The wide string function mbstowcs behaves as expected.

Path conversion is a problem when switching locales.  Typically
an application calls setlocale (LC_ALL, "") only and in that case the
conversion works as desired.  We could switch cygwin_path_conv as
you said, but I'm wondering what side-effects that may have.  See
the comment in internal_setlocale().

> The whole issue occurred to me while trying to work around a missing
> conversion functionality, just converting the pathname syntax between
> Unicode strings. The desired options would be like:
>   CCP_POSIX_W_TO_WIN_W,   /* from is wchar_t *posix, to is wchar_t *win32
> */
>   CCP_WIN_W_TO_POSIX_W,   /* from is wchar_t *win32, to is wchar_t *posix
> */

Those are not available because POSIX paths are always multibyte strings.
Patches welcome, though.


Corinna

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

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