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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
}
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