[PATCH] Handle variable width encodings in basic_filebuf::seekpos

[Paolo Carlini]

Pétur Runólfsson wrote:

>When I run the test with LANG=C, it uses less than 1MB of memory and
>runs OK, but when run with LANG=is_IS.UTF-8, it uses 2.9MB and
>fails. Setting the limit to 5MB allows it to run with both settings
>of LANG.
>  
>
Ah! Now everything makes sense! Thanks!

Paolo.