From: Vincent Lefevre <vincent@vinc17.net>
To: zsh-workers@zsh.org
Subject: Re: printf %<n>s in UTF-8 is not always POSIX-compliant
Date: Wed, 15 Feb 2012 10:10:44 +0100 [thread overview]
Message-ID: <20120215091044.GB19525@xvii.vinc17.org> (raw)
In-Reply-To: <120215001413.ZM22585@torch.brasslantern.com>
On 2012-02-15 00:14:12 -0800, Bart Schaefer wrote:
> On Feb 15, 3:15am, Vincent Lefevre wrote:
> }
> } In UTF-8 locales:
> }
> } xvii% printf ".%2s.\n" é
> } .é.
>
> Am I understanding correctly that the intent here is that é is a two-
> byte character so %2s should print the two literal bytes, rather than
> print the single logical character in a field two logical characters
> wide?
Yes, the number is the size in bytes, not in characters. I think
that the intent is to deal with internal structures (e.g. with
file formats where some fields have a fixed or limited size, and
the same syntax can be used in C to avoid buffer overflows).
Note that there's the same problem with:
xvii% printf ".%.3s.\n" éabcd
.éab.
xvii% emulate ksh
xvii% printf ".%.3s.\n" éabcd
.éab.
xvii% emulate sh
xvii% printf ".%.3s.\n" éabcd
.éa.
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
next prev parent reply other threads:[~2012-02-15 9:10 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-15 2:15 Vincent Lefevre
2012-02-15 8:14 ` Bart Schaefer
2012-02-15 9:10 ` Vincent Lefevre [this message]
2012-02-15 11:05 ` Peter Stephenson
2012-02-15 11:53 ` Vincent Lefevre
2012-02-15 12:09 ` Frank Terbeck
2012-02-15 12:23 ` Peter Stephenson
2012-02-15 12:42 ` Vincent Lefevre
2012-02-15 14:42 ` Oliver Kiddle
2012-02-15 14:56 ` Vincent Lefevre
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