Moving C11 Functions from winsup to newlib

Hi

In looking at what's missing from RTEMS for C11, I noticed that these from
uchar.h are in winsup (as .cc) but not in newlib.

size_t c16rtomb(char *restrict, char16_t, mbstate_t *restrict);
size_t c32rtomb(char *restrict, char32_t, mbstate_t *restrict);
size_t mbrtoc16(char16_t *restrict, const char *restrict, size_t, mbstate_t
*restrict);
size_t mbrtoc32(char32_t *restrict, const char *restrict, size_t, mbstate_t
*restrict);

Would it be ok to move them to the newlib side? Add a uchar directory? Or
where?

What about converting the implementation to C? Is that needed?

Thanks.

--joel