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Re: new console server code checked in

From: Yoshinori K. Okuji
Subject: Re: new console server code checked in
Date: Wed, 05 Jun 2002 20:13:04 +0900
User-agent: Wanderlust/2.8.1 (Something) SEMI/1.14.3 (Ushinoya) FLIM/1.14.3 (Unebigoryōmae) APEL/10.3 Emacs/21.2 (i386-debian-linux-gnu) MULE/5.0 (SAKAKI)

At Wed,  5 Jun 2002 05:38:38 -0400 (EDT),
Roland McGrath wrote:
> I was (and am still sort of) unclear on UTF-32 vs UCS-4.

Their formats are identical but their semantics is different, because
UCS-4 is defined in ISO/IEC 10646, while UTF-32 is defined in Unicode

Basically ISO/IEC 10646 is a standard only for characters (in normal
sense), so you may not represent invalid characters in UCS-4
(e.g. 0xFFFF).

On the other hand, UTF-32 disallows you to use any code value that
cannot be coded in UTF-16, that is, you can use only the range
[0x00000000, 0x0010FFFF].

There are some other differences, but, in brief, you can assume that
they are the same, as long as you use them as internal encodings.


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