forked from bonsai/harakit
48 lines
1023 B
Rust
48 lines
1023 B
Rust
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use std::{
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env::args,
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io::{ stdin, stdout, Error, ErrorKind, Read, Write },
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process::ExitCode,
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vec::Vec
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};
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extern crate sysexits;
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use sysexits::{ EX_OK, EX_OSERR };
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fn oserr(s: &str, e: Error) -> ExitCode {
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eprintln!("{}: {}", s, e);
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ExitCode::from(EX_OSERR as u8)
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}
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fn main() -> ExitCode {
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let argv = args().collect::<Vec<String>>();
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let mut buf: Vec<u8> = Vec::new();
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let mut input = stdin();
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let mut output = stdout().lock();
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let wordsize: usize = 2;
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let force = false;
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buf.resize(wordsize, 0);
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loop {
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match input.read(&mut buf) {
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Ok(0) => break ExitCode::from(EX_OK as u8),
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Ok(v) if v == wordsize => {
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let (left, right) = buf.split_at(v/2);
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if let Err(e) = output.write(&right)
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.and_then(|_| output.write(&left)) {
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break oserr(&argv[0], e)
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}
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},
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Ok(v) => {
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if let Err(e) = output.write(&buf[..v]) {
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break oserr(&argv[0], e)
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}
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},
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Err(e) if e.kind() == ErrorKind::Interrupted && force => continue,
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Err(e) => break oserr(&argv[0], e)
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}
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}
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}
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