git: 9front

ref: a60a794ed154a57b2f8c43d27c83a85f7b352165
dir: /sys/src/cmd/unix/drawterm/libc/utflen.c/

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#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++;
	}
	return 0;
}