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Date:	Fri, 28 Jul 2023 11:00:30 +0200
To:	cygwin AT cygwin DOT com
Subject:	Re: fnmatch improvements
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From:	Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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Cc:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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On Jul 27 16:17, Brian Inglis via Cygwin wrote:
> On 2023-07-27 15:22, Bruno Haible wrote:
> > Brian Inglis wrote:
> > > It was added in C99 TR19769, integrated in C/++11
> > 
> > Yes.
> > 
> > > available in libicu-devel:
> > > 
> > > 	https://cplusplus.com/reference/cuchar/
> > > 
> > > 	https://open-std.org/jtc1/sc22/open/n3579.pdf
> > > 
> > > 	https://open-std.org/jtc1/sc22/wg14/www/docs/n1326.pdf
> > > 
> > > 	https://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf#page=416
> > > 
> > > 	$ find /usr/include/ -name uchar.h
> > > 	/usr/include/unicode/uchar.h
> > > 
> > > 	$ cygcheck -f /usr/include/unicode/uchar.h
> > > 	libicu-devel-72.1-1
> > 
> > This file, <unicode/uchar.h> from ICU4C, is something completely different than
> > ISO C's <uchar.h>.
> 
> This would then be a *newlib* AT sourceware DOT org addition so we could use
> FreeBSD's:

We can use FreeBSDs version as role model, but we can't use the code
verbatim, given FreeBSD assumes sizeof(wchar_t) == 4.

Since that's a Cygwin-only issue (2 byte wchar_t, that is), I guess we
should merge the code into the Cygwin code base, rather than newlib.

For mbrtoc32/c32rtomb, we can use the wirtomb/mbrtowi function I
introduced for the globbing code.  If we do that, I think the functions
should actually be renamed accordingly and the globbing code should use
uchar32_t rather than wint_t.

Also, it might be helpful to add the mbrtoc8/c8rtomb extensions at one
point, which are missing in FreeBSD.

Either way, I'd be grateful for patches in this area.


Corinna

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