GNU bug report logs - #10627
char-ready? is broken for multibyte encodings

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Message #23 received at 10627 <at> debbugs.gnu.org (full text, mbox):

From: Andy Wingo <wingo <at> pobox.com>
To: Mark H Weaver <mhw <at> netris.org>
Cc: 10627 <at> debbugs.gnu.org
Subject: Re: bug#10627: char-ready? is broken for multibyte encodings
Date: Mon, 25 Feb 2013 09:55:44 +0100

Hi Mark,

Are you proposing that `char-ready?' do a nonblocking read if
the buffer is empty?  That could work.

On Mon 25 Feb 2013 01:06, Mark H Weaver <mhw <at> netris.org> writes:

> However, is seems to me that implementing this in terms of read-byte and
> unget-byte is simpler, because it avoids duplication of the logic
> regarding putback buffers and refilling of buffers.

Could work, if the port is nonblocking to begin with.

> I agree that 'char-ready?' is an antiquated interface, but it is
> nonetheless part of the R5RS (and Guile since approximately forever),
> and it is the only way to do a non-blocking read in portable R5RS.  It
> seems to me that we ought to try to implement it as well as we can, no?

Do what you like to do :)  But if it were my time, I would simply
document that it checks for a byte and not a character and move on.

Andy
-- 
http://wingolog.org/

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