From: Ulrike Fischer <news3@nililand.de>
To: ntg-context@ntg.nl
Subject: Re: Unicode question
Date: Thu, 12 Mar 2015 16:41:59 +0100 [thread overview]
Message-ID: <xj7eosydgays$.dlg@nililand.de> (raw)
In-Reply-To: <20150312084827.6683072a@arcor.com>
Am Thu, 12 Mar 2015 08:48:27 +0100 schrieb Manfred Lotz:
> Hi all,
> If I run this minimal example
>
> \starttext
>
> �
>
> \stopluacode
>
> \stoptext
>
>
> I get
>
> tex error > error on line 3 in file /data/tmp/u1.tex: ! String
> contains an invalid utf-8 sequence
>
> and some more lines.
>
>
> The character above is:
>
> Character: �
> Character name: REPLACEMENT CHARACTER
> Charblock: Specials
> Category: Other symbol
> Unicode: U+fffd
> UTF8: 0xefbfbd
>
> which is a valid utf8 character.
>
> Questions:
>
> 1. Why is it considered to be invalid?
This is not a context question/problem but related to the binary
(you would get the same error with lualatex or plain)
The luatex code contains the lines (in unistring.w)
if (val == 0xFFFD)
utf_error();
return (val);
in a function str2uni. I didn't really try to understand the code
but it looks as if 0xFFFD is used as "invalid marker": If luatex
encounters something that isn't valid utf8 it maps val to 0xFFFD and
then test against 0xFFFD to rise an error.
> 2. Are there other valid utf8 characters which are considered invalid?
The comment in the code says
/* the 5- and 6-byte UTF-8 sequences generate integers
that are outside of the valid UCS range, and therefore
unsupported
*/
--
Ulrike Fischer
http://www.troubleshooting-tex.de/
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next prev parent reply other threads:[~2015-03-12 15:41 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-12 7:48 Manfred Lotz
2015-03-12 15:41 ` Ulrike Fischer [this message]
2015-03-12 16:35 ` Arthur Reutenauer
2015-03-12 18:08 ` Manfred Lotz
2015-03-12 19:04 ` Hans Hagen
2015-03-12 17:57 ` Manfred Lotz
2015-03-12 18:55 ` Hans Hagen
2015-03-12 20:41 ` luigi scarso
2015-03-12 20:52 ` Hans Hagen
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