The return value of mbrtowc() is a size_t (unsigned), so don't

assign it to an int and then check if it's < 0, as that won't
work on a system where an int is larger than a size_t.  Also,
the code that handled partial multibyte characters (that were
assembled from multiple bytes of a metafied string) was not
advancing past all the assembled bytes, nor was it handling the
decoding of a '\0' char (it looks like it could have infinite
looped in that case).

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