From cf32fe3327ba3af871bfecc37bb6a11d1bb1ccf5 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Sun, 27 May 2018 11:40:55 +0300
Subject: Add: rudimentary wc

---
 .gitignore  |  3 +++
 Cargo.toml  |  6 ++++++
 src/main.rs | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 test.txt    |  3 +++
 4 files changed, 80 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs
 create mode 100644 test.txt

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..70e3cae
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+
+/target
+**/*.rs.bk
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..48e34ae
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "wc"
+version = "0.1.0"
+authors = ["Lars Wirzenius <liw@liw.fi>"]
+
+[dependencies]
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..50d3663
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,68 @@
+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
+}
diff --git a/test.txt b/test.txt
new file mode 100644
index 0000000..720da0f
--- /dev/null
+++ b/test.txt
@@ -0,0 +1,3 @@
+töttörööt
+second
+third line
-- 
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