utf32 support

[John Howard]

A 32 bit character type is supported by FreeBSD.

Unicode 2012 says utf32 must be a 32 bit signed integer. Unicode only defines the Codepoint character attribute.

RTEMS now uses libBSD and newlib. Need kernel to support the Codepoint range of values. Applications can then use additional user-defined character attributes.

— John

P.S.: UTF32 exists for Unicode in 2012 after consolidation from ISO 10646-2012. The two standards merged.

On Mar 19, 2024, at 6:20 AM, Frank Kühndel <frank.kuehndel at embedded-brains.de> wrote:

Hello John,

just a side node:

Strictly speaking UTF32 does not exist [1]. The correct name is UCS-4 (i.e store each character in four bytes). "Current plans are that there will never be characters assigned outside the 21-bit code space from 0x000000 to 0x10FFFF" [2].

References:

[1] Section "Unicode encodings" in https://tldp.org/HOWTO/Unicode-HOWTO-1.html#ss1.2

[2] Section "What are UCS and ISO 10646?" in https://www.cl.cam.ac.uk/~mgk25/unicode.html

Greetings,
fk

> On 3/18/24 19:02, Gedare Bloom wrote:
> I think it would be wchar_t support in newlib.
>> On Mon, Mar 18, 2024 at 11:56 AM Joel Sherrill<joel at rtems.org>  wrote:
>> What does support for UTF-32 entail? Do you have an idea what software functions you are looking for?
>> 
>> I see the International Components for Unicode (ICU) has a converter (https://icu.unicode.org/download) which looks it might be part of a solution.
>> 
>> Multibyte character methods defined by POSIX would be in newlib.
>> 
>> I'm not well versed in this area so have questions but I think it basically comes down to what software libraries an application needs and porting those to RTEMS -- assuming the license is ok.
>> 
>> --joel
>> 
>>> On Mon, Mar 18, 2024 at 12:15 PM John Howard<echosoft.llc at gmail.com>  wrote:
>>> I want to add utf32 support.
>>> 
>>> Where do I start?
>>> 
>>> — John
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