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`wmemcpy'--copy wide-characters in memory

     #include <wchar.h>
     wchar_t *wmemcpy(wchar_t *D, const wchar_t *S, size_t N);
The `wmemcpy' function copies N wide-characters from the object pointed
to by S to the object pointed to be D. This function is not affected by
locale and all wchar_t values are treated identically.  The null
wide-character and wchar_t values not corresponding to valid characters
are not treated specially.
   If N is zero, D and S must be a valid pointers, and the function
copies zero wide-characters.
The `wmemcpy' function returns the value of D.
`wmemcpy' is ISO/IEC 9899/AMD1:1995 (ISO C).  No supporting OS
subroutines are required.