GeezerVison

[MAL]
> Why would you want to fix it ? Format characters will always
> be ASCII and thus 7-bit -- theres really no need to expand the
> set of possibilities beyond 8 bits ;-)

[AMK]
> This message is for characters that aren't format characters, which
> therefore includes all characters >127.

I'm with the wise man who suggested to drop the %c in this case and just
display the hex value.  Although it would be more readable to drop the %c if
and only if the bogus format character isn't printable 7-bit ASCII.  Which
is obvious, yes?  A new if/else isn't going to hurt anything.