#include <u.h>#include <libc.h> intutflen(char *s){	int c;	long n;	Rune rune; 	n = 0;	for(;;) {		c = *(uchar*)s;		if(c < Runeself) {			if(c == 0)				return n;			s++;		} else			s += chartorune(&rune, s);		n++;	}}