From 4a077a88b3c8290935e05283caa861e253278582 Mon Sep 17 00:00:00 2001 From: Lars Wirzenius Date: Sat, 12 May 2018 08:12:53 +0000 Subject: Add: initial commit --- src/main.rs | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 src/main.rs (limited to 'src') 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 = 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(); +} -- cgit v1.2.1