ref: efe5c58c017f8a4b85f8915e4ae8d55f04f2ea77
dir: /sys/src/libc/fmt/fmtrune.c/
#include <u.h>
#include <libc.h>
#include "fmtdef.h"
int
fmtrune(Fmt *f, int r)
{
Rune *rt;
char *t;
int n;
if(f->runes){
rt = f->to;
FMTRCHAR(f, rt, f->stop, r);
f->to = rt;
n = 1;
}else{
t = f->to;
FMTRUNE(f, t, f->stop, r);
n = t - (char*)f->to;
f->to = t;
}
f->nfmt += n;
return 0;
}