ref: ad6b99359d4bc513e9a24f865bd310743b75e259
dir: /sys/src/libc/fmt/runevsnprint.c/
#include <u.h>
#include <libc.h>
int
runevsnprint(Rune *buf, int len, char *fmt, va_list args)
{
Fmt f;
if(len <= 0)
return -1;
f.runes = 1;
f.start = buf;
f.to = buf;
f.stop = buf + len - 1;
f.flush = nil;
f.farg = nil;
f.nfmt = 0;
f.args = args;
dofmt(&f, fmt);
*(Rune*)f.to = '\0';
return (Rune*)f.to - buf;
}