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// Copyright 2018 Developers of the Rand project.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
extern crate std;

use crate::{error::UNKNOWN_IO_ERROR, Error};
use core::convert::From;
use core::num::NonZeroU32;
use std::io;

impl From<io::Error> for Error {
    fn from(err: io::Error) -> Self {
        if let Some(errno) = err.raw_os_error() {
            if let Some(code) = NonZeroU32::new(errno as u32) {
                return Error::from(code);
            }
        }
        UNKNOWN_IO_ERROR
    }
}

impl From<Error> for io::Error {
    fn from(err: Error) -> Self {
        match err.raw_os_error() {
            Some(errno) => io::Error::from_raw_os_error(errno),
            None => io::Error::new(io::ErrorKind::Other, err),
        }
    }
}

impl std::error::Error for Error {}