The wmemmove() function shall copy n wide characters from the
object pointed to by ws2 to the object pointed to by ws1.
Copying shall take place as if the n wide characters from the object
pointed to by ws2 are first copied into a temporary array of n
wide characters that does not overlap the objects pointed to by ws1 or
ws2, and then the n wide characters from the temporary array are
copied into the object pointed to by ws1.
This function shall not be affected by locale and all wchar_t values
shall be treated identically. The null wide character and wchar_t
values not corresponding to valid characters shall not be treated specially.
If n is zero, the application shall ensure that ws1 and ws2
are valid pointers, and the function shall copy zero wide characters.
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html