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

    #![stable(feature = "rust1", since = "1.0.0")]

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

    /// Unix-specific extensions to [`OsString`].
    ///
    /// [`OsString`]: ../../../../std/ffi/struct.OsString.html
    #[stable(feature = "rust1", since = "1.0.0")]
    pub trait OsStringExt {
        /// Creates an [`OsString`] from a byte vector.
        ///
        /// # Examples
        ///
        /// ```
        /// use std::ffi::OsString;
        /// use std::os::unix::ffi::OsStringExt;
        ///
        /// let bytes = b"foo".to_vec();
        /// let os_string = OsString::from_vec(bytes);
        /// assert_eq!(os_string.to_str(), Some("foo"));
        /// ```
        ///
        /// [`OsString`]: ../../../ffi/struct.OsString.html
        #[stable(feature = "rust1", since = "1.0.0")]
        fn from_vec(vec: Vec<u8>) -> Self;

        /// Yields the underlying byte vector of this [`OsString`].
        ///
        /// # Examples
        ///
        /// ```
        /// use std::ffi::OsString;
        /// use std::os::unix::ffi::OsStringExt;
        ///
        /// let mut os_string = OsString::new();
        /// os_string.push("foo");
        /// let bytes = os_string.into_vec();
        /// assert_eq!(bytes, b"foo");
        /// ```
        ///
        /// [`OsString`]: ../../../ffi/struct.OsString.html
        #[stable(feature = "rust1", since = "1.0.0")]
        fn into_vec(self) -> Vec<u8>;
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    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`].
    ///
    /// [`OsStr`]: ../../../../std/ffi/struct.OsStr.html
    #[stable(feature = "rust1", since = "1.0.0")]
    pub trait OsStrExt {
        #[stable(feature = "rust1", since = "1.0.0")]
        /// Creates an [`OsStr`] from a byte slice.
        ///
        /// # Examples
        ///
        /// ```
        /// use std::ffi::OsStr;
        /// use std::os::unix::ffi::OsStrExt;
        ///
        /// let bytes = b"foo";
        /// let os_str = OsStr::from_bytes(bytes);
        /// assert_eq!(os_str.to_str(), Some("foo"));
        /// ```
        ///
        /// [`OsStr`]: ../../../ffi/struct.OsStr.html
        fn from_bytes(slice: &[u8]) -> &Self;

        /// Gets the underlying byte view of the [`OsStr`] slice.
        ///
        /// # Examples
        ///
        /// ```
        /// use std::ffi::OsStr;
        /// use std::os::unix::ffi::OsStrExt;
        ///
        /// let mut os_str = OsStr::new("foo");
        /// let bytes = os_str.as_bytes();
        /// assert_eq!(bytes, b"foo");
        /// ```
        ///
        /// [`OsStr`]: ../../../ffi/struct.OsStr.html
        #[stable(feature = "rust1", since = "1.0.0")]
        fn as_bytes(&self) -> &[u8];
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    impl OsStrExt for OsStr {
        fn from_bytes(slice: &[u8]) -> &OsStr {
            unsafe { mem::transmute(slice) }
        }
        fn as_bytes(&self) -> &[u8] {
            &self.as_inner().inner
        }
    }

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