ref: d11e24ad4b18a403a80819382652b36c50266c53
dir: /lib9/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++; } }