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Date:	Thu, 20 May 2010 20:46:05 +0300
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Subject:	Re: sed doesn't like LANG= anymore
From:	Andy Koppe <andy DOT koppe AT gmail DOT com>
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On Thursday, May 20, 2010, Thomas Wolff:
> With LANG=anything-unknown, the charmap is set to ASCII, so it works (as there is at least no multibyte character then).

Anything above 0x7F is invalid with charset ASCII though (since
1.7.2). But perhaps sed skips the multibyte conversion functions when
in the C locale.

> Considering the described effect, I doubt that a UTF-8 decoder should swallow an ASCII byte after an incomplete UTF-8 sequence;
> it should rather stop at the last UTF-8 sequence byte, and consider any subsequent initial UTF-8 or ASCII byte as a new character.

0xE5 is a valid initial byte of a UTF-8 sequence, hence mbtowc returns
-2 ("incomplete") after that and -1 ("invalid") on encountering the
following ASCII byte. I think it would be wrong to ignore the encoding
error, and it's up to the application to back up and feed in the same
byte again if it wants to.

Andy

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