use std::env;
use std::fs::File;
use std::io::prelude::*;

const BUFSIZE: usize = 128;
const NL: u8 = 10;
const SPACE: u8 = 32;

fn main() {
    for filename in env::args().skip(1) {
        let mut f = File::open(&filename).unwrap();
        let (l, w, c) = wc(&mut f);
        println!("{} {} {} {}", l, w, c, filename);
    }
}


fn wc(f: &mut File) -> (usize, usize, usize) {
    let mut buffer = vec![0; BUFSIZE];
    let mut chars: usize = 0;
    let mut lines: usize = 0;
    let mut words: usize = 0;
    let mut inword = false;

    loop {
        match f.read(&mut buffer).unwrap() {
            0 => break,
            n => {
                chars += n;
                lines += count_newlines(&buffer, n);
                words += count_words(&buffer, n, &mut inword);
            }
        };
    }
    (lines, words, chars)
}


fn count_newlines(buf: &[u8], len: usize) -> usize{
    let mut i = 0;
    let mut n = 0;
    while i < len {
        if buf[i] == NL {
            n += 1;
        }
        i += 1;
    }
    n
}


fn count_words(buf: &[u8], len: usize, inword: &mut bool) -> usize {
    let mut n = 0;
    let mut i = 0;

    while i < len {
        if buf[i] == NL || buf[i] == SPACE {
            *inword = false;
        } else {
            if !*inword {
                *inword = true;
                n += 1;
            }
        }
        i += 1;
    }
    n
}