3.31 towctrans—extensible wide-character translation

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.