/*	This source code was extracted from the Q8 package created and placed
    in the PUBLIC DOMAIN by Doug Gwyn <gwyn@arl.mil>
    last edit:	1999/11/05	gwyn@arl.mil

    Implements subclause 7.24 of ISO/IEC 9899:1999 (E).

	It supports an encoding where all char codes are mapped
	to the *same* code values within a wchar_t or wint_t,
	so long as no other wchar_t codes are used by the program.

*/

#include	<errno.h>
#include	<stdio.h>
#include	<stdlib.h>
#include	<wchar.h>

wchar_t *
wmemmove(s1, s2, n)
	register wchar_t		*s1;
	register const wchar_t	*s2;
	register size_t			n;
	{
	wchar_t				*orig_s1 = s1;

	if ( s1 == NULL || s2 == NULL || n == 0 )
		return orig_s1;		/* robust */

	/* XXX -- The following test works only within a flat address space! */
	if ( s2 >= s1 )
		for ( ; n > 0; --n )
			*s1++ = *s2++;
	else	{
		s1 += n;
		s2 += n;

		for ( ; n > 0; --n )
			*--s1 = *--s2;
		}

	return orig_s1;
	}