#include <u.h>#include <libc.h> Rune*runestrncpy(Rune *s1, Rune *s2, long n){	int i;	Rune *os1; 	os1 = s1;	for(i = 0; i < n; i++)		if((*s1++ = *s2++) == 0) {			while(++i < n)				*s1++ = 0;			return os1;		}	return os1;}