Read a byte from stdin in rust

main.rs

use std::io;
use std::io::prelude::*;

fn main() -> io::Result<()> {
    let mut buffer = [0; 1];
    loop {
        let n = io::stdin().read(&mut buffer)?;
        if n == 0 {
            break;
        }
        print!("{}", std::str::from_utf8(&buffer).unwrap());
    }
    io::stdout().flush().unwrap();    
    Ok(())
}

take.rs

use std::io;
use std::io::prelude::*;

fn main() -> io::Result<()> {
    let mut buffer = [0; 1];
    loop {
        let mut handle = io::stdin().take(1);
        let n = handle.read(&mut buffer)?;
        if n == 0 {
            break;
        }
        print!("{}", std::str::from_utf8(&buffer).unwrap());
    }
    io::stdout().flush().unwrap();    
    Ok(())
}

There may be a better way than this. I'm not a Rust expert.
This assumes only ASCII characters will be feeded from stdin.