mirror of
https://github.com/uutils/coreutils
synced 2024-10-04 14:59:20 +00:00
commit
2065b31f8b
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@ -132,7 +132,6 @@ To do
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- stat
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- stdbuf
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- stty (in progress)
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- sum
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- sync
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- tac-pipe
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- tail
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129
sum/sum.rs
Normal file
129
sum/sum.rs
Normal file
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@ -0,0 +1,129 @@
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#![crate_id(name="sum", vers="1.0.0", author="T. Jameson Little")]
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#![feature(macro_rules)]
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/*
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* This file is part of the uutils coreutils package.
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*
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* (c) T. Jameson Little <t.jameson.little@gmail.com>
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*
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* For the full copyright and license information, please view the LICENSE file
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* that was distributed with this source code.
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*/
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extern crate getopts;
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extern crate libc;
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use std::os;
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use std::io::{File, IoResult, print};
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use std::io::stdio::{stdin_raw};
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#[path="../common/util.rs"]
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mod util;
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static VERSION: &'static str = "1.0.0";
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static NAME: &'static str = "sum";
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fn bsd_sum(mut reader: Box<Reader>) -> (uint, u16) {
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let mut buf = ~[0, .. 1024];
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let mut blocks_read = 0;
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let mut checksum: u16 = 0;
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loop {
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match reader.read(buf) {
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Ok(n) if n != 0 => {
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blocks_read += 1;
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for &byte in buf.slice_to(n).iter() {
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checksum = (checksum >> 1) + ((checksum & 1) << 15);
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checksum += byte as u16;
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}
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},
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_ => break,
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}
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}
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(blocks_read, checksum)
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}
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fn sysv_sum(mut reader: Box<Reader>) -> (uint, u16) {
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let mut buf = ~[0, .. 512];
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let mut blocks_read = 0;
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let mut ret = 0;
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loop {
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match reader.read(buf) {
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Ok(n) if n != 0 => {
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blocks_read += 1;
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for &byte in buf.slice_to(n).iter() {
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ret += byte as u32;
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}
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},
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_ => break,
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}
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}
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ret = (ret & 0xffff) + (ret >> 16);
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ret = (ret & 0xffff) + (ret >> 16);
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(blocks_read, ret as u16)
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}
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fn open(name: &str) -> IoResult<Box<Reader>> {
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match name {
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"-" => Ok(box stdin_raw() as Box<Reader>),
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_ => {
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let f = try!(File::open(&Path::new(name)));
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Ok(box f as Box<Reader>)
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}
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}
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}
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fn main() {
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let args = os::args();
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let program = args.get(0).as_slice();
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let opts = [
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getopts::optflag("r", "", "use the BSD compatible algorithm (default)"),
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getopts::optflag("s", "sysv", "use System V compatible algorithm"),
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getopts::optflag("h", "help", "show this help message"),
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getopts::optflag("v", "version", "print the version and exit"),
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];
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let matches = match getopts::getopts(args.tail(), opts) {
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Ok(m) => m,
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Err(f) => crash!(1, "Invalid options\n{}", f.to_err_msg())
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};
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if matches.opt_present("help") {
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println!("{} {}", program, VERSION);
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println!("");
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println!("Usage:");
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println!(" {0:s} [OPTION]... [FILE]...", program);
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println!("");
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print(getopts::usage("checksum and count the blocks in a file", opts).as_slice());
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println!("");
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println!("With no FILE, or when FILE is -, read standard input.");
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return;
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}
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if matches.opt_present("version") {
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println!("{} {}", program, VERSION);
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return;
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}
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let sysv = matches.opt_present("sysv");
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let file = if matches.free.is_empty() {
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"-"
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} else {
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matches.free.get(0).as_slice()
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};
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let reader = match open(file) {
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Ok(f) => f,
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_ => crash!(1, "unable to open file")
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};
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let (blocks, sum) = if sysv {
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sysv_sum(reader)
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} else {
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bsd_sum(reader)
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};
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println!("{} {}", sum, blocks);
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}
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