Re: u8_strconv_to_locale() misbehaves on OSX (Travis CI runner)

[Tim Ruehsen <tim.ruehsen@gmx.de>]

Hi Bruno,

thanks for your answer... after thinking about the ambiguous output of
locale_charset() this might be an explanation:

Libidn2 (and the tests) use libunistring installed from homebrew while
my direct call to locale_charset() is from gnulib.

So my build correctly says UTF-8, but the homwbrew libunistring has
been built on some unknown (OSX ?) system with their own version of 
locale_charset() returning ASCII. I said I get ? from characters > 255,
but I didn't make sure. Maybe it is characters > 127.

The bad thing is, I only experience this on a Travis CI build and so
can't use gdb for single stepping.

But an option is to build libunistring from sources in the CI and
link/test with that.

Regards, Tim


Am Donnerstag, den 08.02.2018, 18:05 +0100 schrieb Bruno Haible:
> Hi Tim,
> 
> > locale_charset() returns with "UTF-8".
> 
> That is as it should be on Mac OS X.
> 
> > u8_strconv_to_locale() and u8_strconv_from_locale() seem not to
> > work as
> > expected:
> > 
> > 
> > One problem seems to be that u8_strconv_to_locale() outputs
> > decomposed
> > characters, e.g. u8_strconv_to_locale(bücher.de) returns
> > b"ucher.de.
> > 
> > Hex/u32:
> > 
> > Result: U+0062 U+0022 U+0075 U+0063 U+0068 U+0065 U+0072 U+002e
> > U+0064
> > U+0065)
> > 
> > Expected: U+0062 U+00fc U+0063 U+0068 U+0065 U+0072 U+002e U+0064
> > U+0065
> 
> This would indicate that locale_charset() returns "ASCII".
> What happens then is that, because u8_strconv_to_locale invokes
> u8_strconv_to_encoding, which invokes mem_iconveha with
> transliterate=true,
> which appends '//TRANSLIT' when invoking iconv_open. you get the
> transliteration, e.g. from 'ü' to '"u'.
> 
> > The second problem is that characters beyond 255 are translated
> > into ?
> > (U+003f).
> 
> This would indicate that locale_charset() returns "ISO-8859-1". The
> question marks then come from the transliteration, again.
> 
> > Do you have any hints how to fix these problems ?
> 
> I would compile without -O and with -ggdb, then single-step through
> the code,
> paying particular attention to the value of locale_charset() and to
> the arguments of iconv_open().
> 
> > I would expect u8_strconv_to_locale() to work in a defined manner
> > on
> > UTF-8 locales
> 
> That's certainly how it is intended to be.
> 
> Bruno
> 
>