Re: [PATCH] Unicode Lisp reader escapes

[Eli Zaretskii]

> From: Kenichi Handa <address@hidden>
> Date: Tue, 02 May 2006 15:43:16 +0900
> Cc: address@hidden
> 
> > +   lisp_char = call2(intern("decode-char"), intern("ucs"),
> > +                     make_number(i));
> > +
> 
> First of all, is it safe to call Lisp program in
> read_escape?

Whether it is safe or not, I think it's certainly better to implement
the guts of decode-char in C, if it's gonna be called from
read_escape.  All those guts do is simple arithmetics, which will be
much faster in C.

Moreover, I think the fact that decode-char uses translation tables to
support unify-8859-on-*coding-mode (and thus might produce characters
other than mule-unicode-*) could even be a misfeature: do we really
want read_escape to produce Unicode or non-Unicode characters when it
sees \uNNNN, depending on the current user settings?