ref: 2e2a91f26b4724ae5f9942d545749a16b46c2a3f
dir: /sys/src/cmd/unix/drawterm/libc/runefmtstr.c/
#include <u.h>
#include <libc.h>
#include "fmtdef.h"
Rune*
runefmtstrflush(Fmt *f)
{
if(f->start == nil)
return nil;
*(Rune*)f->to = '\0';
return f->start;
}