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- #include <u.h>
- #include <libc.h>
- int
- utfnlen(char *s, long m)
- {
- int c;
- long n;
- Rune rune;
- char *es;
- es = s + m;
- for(n = 0; s < es; n++) {
- c = *(uchar*)s;
- if(c < Runeself){
- if(c == '\0')
- break;
- s++;
- continue;
- }
- if(!fullrune(s, es-s))
- break;
- s += chartorune(&rune, s);
- }
- return n;
- }
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