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`towctrans'--extensible wide-character case mapping

*Synopsis*
     #include <wctype.h>
     wint_t towctrans(wint_t C, wctrans_t W);
   *Description*
`towctrans' is a function which converts wide-characters based on a
specified translation type W.  If the translation type is invalid or
cannot be applied to the current character, no change to the character
is made.
*Returns*
`towctrans' returns the translated equivalent of C when it is a valid
for the given translation, otherwise, it returns the input character.
When the translation type is invalid, `errno' is set `EINVAL'.
*Portability*
`towctrans' is C99.
   No supporting OS subroutines are required.