sys/src/libc/port/utfnlen.c

   1 #include <u.h>
   2 #include <libc.h>
   3
   4 int
   5 utfnlen(char *s, long m)
   6 {
   7         int c;
   8         long n;
   9         Rune rune;
  10         char *es;
  11
  12         es = s + m;
  13         for(n = 0; s < es; n++) {
  14                 c = *(uchar*)s;
  15                 if(c < Runeself){
  16                         if(c == '\0')
  17                                 break;
  18                         s++;
  19                         continue;
  20                 }
  21                 if(!fullrune(s, es-s))
  22                         break;
  23                 s += chartorune(&rune, s);
  24         }
  25         return n;
  26 }