[Bug stdio/6530] *printf() and incomplete multibyte sequences returns -1 bogusly

["bugdal at aerifal dot cx" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=6530

--- Comment #20 from Rich Felker <bugdal at aerifal dot cx> 2012-06-23 11:37:57 UTC ---
I don't think there's any concern about breaking wprintf. wprintf inherently
operates by converting the argument to %s to wide characters since its output
it wide characters; as such, there's no way it could avoid failing when the
input is an invalid multibyte sequence unless it completely ignored the failure
return.

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