[Bug stdio/34281] fseek on pbackfail'ed wide stream triggers abort

https://sourceware.org/bugzilla/show_bug.cgi?id=34281

Florian Weimer <fweimer at redhat dot com> changed:

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                 CC|                            |fweimer at redhat dot com

--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
I think for wide streams (and text streams more generally), applications are
expected to use fsetpos, not fseek.

I thought we had some complicate code which winds forward to get a meaningful
byte-based fseek on wide streams, though. Maybe this needs to be replicated at
the point of the abort. I'm not completely sure if this can be made to work
completely correctly because an application may ungetwc a character that
triggers a change in shift state.

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