rppal 0.11.1

// Copyright (c) 2017-2019 Rene van der Meer
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

macro_rules! parse_retval {
    ($retval:expr) => {{
        let retval = $retval;

        if retval == -1 {
            Err(std::io::Error::last_os_error())
        } else {
            Ok(retval)
        }
    }};
}

// Initialize an array with a type that doesn't implement Copy
macro_rules! init_array {
    ($val:expr, $len:expr) => {{
        let mut array: [_; $len] = unsafe { std::mem::uninitialized() };
        for elem in array.iter_mut() {
            unsafe {
                std::ptr::write(elem, $val);
            }
        }
        array
    }};
}