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// Copyright (C) 2017-2018 Baidu, Inc. All Rights Reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//  * Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//  * Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in
//    the documentation and/or other materials provided with the
//    distribution.
//  * Neither the name of Baidu, Inc., nor the names of its
//    contributors may be used to endorse or promote products derived
//    from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//! Unix-specific extension to the primitives in the `std::ffi` module

use core::mem;
use ffi::{OsStr, OsString};
use sys::os_str::Buf;
use sys_common::{FromInner, IntoInner, AsInner};

/// Unix-specific extensions to `OsString`.
pub trait OsStringExt {
    /// Creates an [`OsString`] from a byte vector.
    ///
    fn from_vec(vec: Vec<u8>) -> Self;

    /// Yields the underlying byte vector of this [`OsString`].
    ///
    fn into_vec(self) -> Vec<u8>;
}

impl OsStringExt for OsString {
    fn from_vec(vec: Vec<u8>) -> OsString {
        FromInner::from_inner(Buf { inner: vec })
    }
    fn into_vec(self) -> Vec<u8> {
        self.into_inner().inner
    }
}

/// Unix-specific extensions to `OsStr`.
pub trait OsStrExt {
    /// Creates an [`OsStr`] from a byte slice.
    ///
    fn from_bytes(slice: &[u8]) -> &Self;

    /// Gets the underlying byte view of the [`OsStr`] slice.
    ///
    fn as_bytes(&self) -> &[u8];
}

impl OsStrExt for OsStr {
    fn from_bytes(slice: &[u8]) -> &OsStr {
        unsafe { mem::transmute(slice) }
    }
    fn as_bytes(&self) -> &[u8] {
        &self.as_inner().inner
    }
}