From: Bruno Haible <bruno@clisp.org>
To: Eric Blake <eblake@redhat.com>
Cc: bug-gnulib@gnu.org, cygwin@cygwin.com
Subject: Re: 16-bit wchar_t on Windows and Cygwin
Date: Thu, 03 Feb 2011 00:13:00 -0000 [thread overview]
Message-ID: <201102030112.53179.bruno@clisp.org> (raw)
In-Reply-To: <4D49E68C.2030509@redhat.com>
Hi Eric,
> I was asking:
>
> should wwchar_t (or xwchar_t, but not xchar_t) be 2-bytes on cygwin, but
> unlike the POSIX definition of wchar_t being always 1 character per
> unit, the new type is explicitly documented as being multi-unit on some
> platforms but with sane semantics
>
> or should it always be 4-bytes, where conversion from wchar_t to
> wwchar_t requires some efforts, and where the new type must be used
> everywhere (which means wrapping a lot of APIs), but where you can once
> again assume POSIX semantics of 1 character per unit, simplifying life
> of callers at the expense of converting to the new type
In the first case we wouldn't need a new type.
The plan is the second alternative. The goal is *not* to have to extend
each of quotearg.c, regcomp.c, mbchar.h, wc.c, etc. to handle UTF-16
explicitly with #ifdefs, more variables, and more logic.
> if it works out, should we also add wwchar_t natively into cygwin?
More and more Unix platforms offer only UTF-8 locales. One can predict
that in 10 years, all Unix platforms will offer only UTF-8 locales. At this
point wchar_t will be UCS-4 on all these platforms (except AIX).
The mbrtoc32 function from the C1X API that you pointed to will then be
equivalent to mbrtowwc.
So, you can view 'wwchar_t' as a temporary measure that will bridge the
gap between the ANSI C Amd. 1 API and the C1X API.
Bruno
--
In memoriam Carl Friedrich Goerdeler <http://en.wikipedia.org/wiki/Carl_Friedrich_Goerdeler>
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next prev parent reply other threads:[~2011-02-03 0:13 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <201101310304.42975.bruno@clisp.org>
2011-01-31 19:16 ` Eric Blake
2011-01-31 20:49 ` Corinna Vinschen
2011-02-02 11:29 ` Bruno Haible
2011-02-02 12:15 ` Corinna Vinschen
2011-02-02 12:21 ` Corinna Vinschen
2011-02-02 16:03 ` Bruno Haible
2011-02-02 16:28 ` Corinna Vinschen
2011-02-02 16:35 ` Corinna Vinschen
2011-02-02 20:28 ` Andy Koppe
2011-02-04 22:46 ` Warren Young
2011-02-02 17:52 ` bug#7948: " Paul Eggert
2011-02-02 18:57 ` Bruno Haible
2011-02-02 20:43 ` Andy Koppe
2011-02-03 12:57 ` Ulf Zibis
2011-02-02 21:24 ` Eric Blake
2011-02-02 21:39 ` Corinna Vinschen
2011-02-02 23:03 ` Bruno Haible
2011-02-02 23:19 ` Eric Blake
2011-02-03 0:13 ` Bruno Haible [this message]
2011-02-03 9:42 ` Corinna Vinschen
2011-02-03 10:48 ` Bruno Haible
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