29 lines
837 B
Plaintext
29 lines
837 B
Plaintext
use std::fs::File;
|
|
use std::io::{self, Read, Write};
|
|
use std::path::Path;
|
|
use std::{env, fmt, process};
|
|
|
|
fn main() {
|
|
let files: Vec<_> = env::args_os().skip(1).take(2).collect();
|
|
|
|
if files.len() != 2 {
|
|
exit_err("Both an input file and output file are required", 1);
|
|
}
|
|
|
|
copy(&files[0], &files[1]).unwrap_or_else(|e| exit_err(&e, e.raw_os_error().unwrap_or(-1)));
|
|
}
|
|
|
|
fn copy<P: AsRef<Path>>(infile: P, outfile: P) -> io::Result<()> {
|
|
let mut vec = Vec::new();
|
|
|
|
Ok(try!(File::open(infile)
|
|
.and_then(|mut i| i.read_to_end(&mut vec))
|
|
.and_then(|_| File::create(outfile))
|
|
.and_then(|mut o| o.write_all(&vec))))
|
|
}
|
|
|
|
fn exit_err<T: fmt::Display>(msg: T, code: i32) -> ! {
|
|
writeln!(&mut io::stderr(), "ERROR: {}", msg).expect("Could not write to stdout");
|
|
process::exit(code);
|
|
}
|