ref: cc692fa3e8f8061aa57395db2e8a4b37838e9aa2
dir: /sys/src/libc/port/utflen.c/
#include <u.h>
#include <libc.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++;
}
}