/* * Copy s2 to s1, truncating or null-padding to always copy n bytes * return s1 */char *strncpy(s1, s2, n)register char *s1, *s2;{	register i;	register char *os1;	os1 = s1;	for (i = 0; i < n; i++)		if ((*s1++ = *s2++) == '\0') {			while (++i < n)				*s1++ = '\0';			return(os1);		}	return(os1);}