Add: initial commit

1 files changed, 37 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..b2ee6f0
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,37 @@
+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();
+}