vendor/memmap2/examples/cat.rs

   1 extern crate memmap2;
   2
   3 use std::env;
   4 use std::fs::File;
   5 use std::io::{self, Write};
   6
   7 use memmap2::Mmap;
   8
   9 /// Output a file's contents to stdout. The file path must be provided as the first process
  10 /// argument.
  11 fn main() {
  12     let path = env::args()
  13         .nth(1)
  14         .expect("supply a single path as the program argument");
  15
  16     let file = File::open(path).expect("failed to open the file");
  17
  18     let mmap = unsafe { Mmap::map(&file).expect("failed to map the file") };
  19
  20     io::stdout()
  21         .write_all(&mmap[..])
  22         .expect("failed to output the file contents");
  23 }