From: Kenichi Handa <handa@m17n.org>
Cc: emacs-devel@gnu.org
Subject: Re: Coding system robustness?
Date: Sat, 19 Mar 2005 10:08:16 +0900 (JST) [thread overview]
Message-ID: <200503190108.KAA22411@etlken.m17n.org> (raw)
In-Reply-To: <87wts43jxx.fsf-monnier+emacs@gnu.org> (message from Stefan Monnier on Fri, 18 Mar 2005 13:11:43 -0500)
In article <87wts43jxx.fsf-monnier+emacs@gnu.org>, Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> I'd like to know whether coding systems in general are supposed to be
>> robust, meaning that decoding some random byte string into the coding
>> system and reencoding it is guaranteed to deliver the same byte string
>> again?
> AFAIK, (encode-coding-string (decode-coding-string STR 'foo) 'foo)
> should always return STR, otherwise it's a bug.
> With the introduction of eight-bit-*, this should be true of "all"
> coding-systems in Emacs-21,
No. Redundant escape sequences in iso-2022 based coding
systems are just ignored. For instance,
(decode-coding-string "\e(J" 'iso-2022-jp) => ""
And we can't recover "\e(J" on encoding.
---
Ken'ichi HANDA
handa@m17n.org
next prev parent reply other threads:[~2005-03-19 1:08 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-18 17:45 Coding system robustness? David Kastrup
2005-03-18 18:11 ` Stefan Monnier
2005-03-18 18:33 ` David Kastrup
2005-03-20 0:22 ` Richard Stallman
2005-03-19 1:08 ` Kenichi Handa [this message]
2005-03-19 9:10 ` David Kastrup
2005-03-19 0:52 ` Kenichi Handa
2005-03-19 3:09 ` Richard Stallman
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