#include	<u.h>#include	<libc.h> void*memmove(void *a1, void *a2, ulong n){	char *s1, *s2; 	if((long)n < 0)		abort();	if(a1 > a2)		goto back;	s1 = a1;	s2 = a2;	while(n > 0) {		*s1++ = *s2++;		n--;	}	return a1; back:	s1 = (char*)a1 + n;	s2 = (char*)a2 + n;	while(n > 0) {		*--s1 = *--s2;		n--;	}	return a1;} void*memcpy(void *a1, void *a2, ulong n){	return memmove(a1, a2, n);}