X11R7.5 and C.UTF-8

[Andy Koppe]

2009/12/3 Thomas Dickey:
>> From
>> http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap07.html,
>> §7.2:
>>
>> "The tables in Locale Definition describe the characteristics and
>> behavior of the POSIX locale for data consisting entirely of
>> characters from the portable character set and the control character
>> set. For other characters, the behavior is unspecified."
>>
>> This means that characters 0..127 have to be treated as ASCII, but
>> beyond that an implementation can do what it wants. And on Cygwin 1.7,
>> plain "C" actually does imply UTF-8, which happily is
>> backward-compatible with ASCII.
>
> That's an interpretation that so far hasn't been blessed by the standards
> people.  Any discussion of this topic should mention that, as a caveat.

Fair point. It also means that apps are entitled to assume that "C"
supports no more than ASCII, which is why Cygwin 1.7's default locale
is C.UTF-8. A default locale setting based on the user's language
selection would be better, but we don't have that (yet?).

Andy

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