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use std::env;
use std::fs::File;
use std::io;
use std::io::prelude::*;
const BUFSIZE: usize = 17;
fn main() {
let args: Vec<String> = env::args().collect();
for arg in &args[1..] {
cat(arg, BUFSIZE);
}
}
fn cat(filename: &str, bufsize: usize) {
// The following gives fugly error message if there's a problem.
// Need to find a better way to report errors to normal people.
let mut f = File::open(filename).unwrap();
let mut buffer = vec![0; bufsize];
loop {
match f.read(&mut buffer).unwrap() {
0 => break,
n => write(&buffer[..n]),
};
}
}
fn write(buffer: &[u8]) {
// Again, the error message is fugly if there's a problem. Also,
// ideally this wouldn't hardcode the output stream, but it turns
// out that io::stdout() doesn't return a File, so passing in an
// open file is tricky.
io::stdout().write(&buffer).unwrap();
}
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