Rust bindings to C FILE stream
```rust use std::io::prelude::*; use std::io::{BufReader, SeekFrom};
use cfile;
// open a tempfile let mut f = cfile::tmpfile().unwrap();
// write something to the stream assert_eq!(f.write(b"test").unwrap(), 4);
// force to flush the stream f.flush().unwrap();
// seek to the beginning of stream assert_eq!(f.seek(SeekFrom::Start(0)).unwrap(), 0);
let mut r = BufReader::new(f); let mut s = String::new();
// read back the text asserteq!(r.readline(&mut s).unwrap(), 4); assert_eq!(s, "test"); ```