wmemcpy - copy an array of wide-characters
dest, const wchar_t *src, size_t n);
The wmemcpy function is the wide-character equivalent
of the memcpy function. It copies n wide
characters from the array starting at src to the
array starting at dest.
The arrays may not overlap; use wmemmove(3) to copy
between overlapping arrays.
The programmer must ensure that there is room for at least
n wide characters at dest.
wmemcpy returns dest.
ISO/ANSI C, UNIX98