ref: ccd7f9f1597e56d121e1d05cf6af86f688ef2c48
dir: /libkern/utflen.c/
#include "lib9.h"
int
utflen(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++;
}
}