If s is not a null pointer, mbtowc() shall either return 0 (if s
points to the null byte), or return the number of bytes that
constitute the converted character (if the next n or fewer bytes
form a valid character), or return -1 and may set errno to indicate
the error (if they do not form a valid character).
It goes on to mention EILSEQ. Does that cover your case?
It ... might? I always find a rather large gap between theory and reality
when it comes to those wide character POSIX functions. I think I'll have
to write some tests.
--Ken
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