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From: Martijn Dekker <martijn@inlv.org>
To: zsh-workers@zsh.org
Subject: Re: In POSIX mode, ${#var} measures length in bytes, not characters
Date: Sun, 07 Jun 2015 04:21:45 +0200	[thread overview]
Message-ID: <5573AAB9.5090709@inlv.org> (raw)
In-Reply-To: <6697841433637291@web4o.yandex.ru>

ZyX schreef op 07-06-15 om 02:34:
> Do you have a reference where “character” is defined?

Yes:
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap06.html#tag_06_02

POSIX specifically allows any character encoding, including multibyte
characters, depending on the user's locale, and on the condition that
the portable character set (basically US-ASCII) is a subset of the
locale's character set.

With UTF-8 now the de facto standard locale and it including multibyte
characters, it's become important for shells to get this right.

> This behaviour is the same in posh and dash:

Yes, dash and pdksh/mksh/posh unfortunately have this bug, too.

But bash, ksh93, and yash correctly measure characters, not bytes. (yash
is supposed to be the most POSIX-compliant of them all.)

Thanks,

- Martijn


  parent reply	other threads:[~2015-06-07  2:27 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-07  0:23 Martijn Dekker
2015-06-07  0:34 ` ZyX
2015-06-07  1:23   ` Bart Schaefer
2015-06-07  1:27     ` ZyX
2015-06-07  2:21   ` Martijn Dekker [this message]
2015-06-09 17:49     ` Martijn Dekker
2015-06-08  8:44 ` Peter Stephenson
2015-06-09  2:19   ` Martijn Dekker
2015-06-09  8:35     ` Peter Stephenson
2015-06-09 15:37       ` Bart Schaefer
2015-06-09 15:43         ` Peter Stephenson
2015-06-11 11:23   ` Daniel Shahaf
2015-06-11 11:33     ` Peter Stephenson

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