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

  assign it to an int and then check for negativity, as that won't
  work on a system where an int is larger than a size_t.
- When mbrtowc() returns -2 when given all the remaining chars in a
  string, set an end-of-line flag and avoid calling mbrtowc() again
  for any of the incomplete characters that remain in the string.
- Use STOUC() when passing a char value to nicechar().
- Use "mbs" for the multi-byte state variable name (for consistency).
- Be sure to reset the mbs state if mbrtowc() returns -1.
- Use the new MB_INVALID and MB_INCOMPLETE defines for the size_t
  -1 and -2 values (respectively).

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