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    use ffi;
    use foreign_types::ForeignTypeRef;
    use libc::{c_char, c_void};
    use std::convert::AsRef;
    use std::ffi::CStr;
    use std::fmt;
    use std::ops::Deref;
    use std::str;

    use stack::Stackable;

    foreign_type_and_impl_send_sync! {
        type CType = c_char;
        fn drop = free;

        pub struct OpensslString;
        pub struct OpensslStringRef;
    }

    impl fmt::Display for OpensslString {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            fmt::Display::fmt(&**self, f)
        }
    }

    impl fmt::Debug for OpensslString {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            fmt::Debug::fmt(&**self, f)
        }
    }

    impl Stackable for OpensslString {
        type StackType = ffi::stack_st_OPENSSL_STRING;
    }

    impl AsRef<str> for OpensslString {
        fn as_ref(&self) -> &str {
            &**self
        }
    }

    impl AsRef<[u8]> for OpensslString {
        fn as_ref(&self) -> &[u8] {
            self.as_bytes()
        }
    }

    impl Deref for OpensslStringRef {
        type Target = str;

        fn deref(&self) -> &str {
            unsafe {
                let slice = CStr::from_ptr(self.as_ptr()).to_bytes();
                str::from_utf8_unchecked(slice)
            }
        }
    }

    impl AsRef<str> for OpensslStringRef {
        fn as_ref(&self) -> &str {
            &*self
        }
    }

    impl AsRef<[u8]> for OpensslStringRef {
        fn as_ref(&self) -> &[u8] {
            self.as_bytes()
        }
    }

    impl fmt::Display for OpensslStringRef {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            fmt::Display::fmt(&**self, f)
        }
    }

    impl fmt::Debug for OpensslStringRef {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            fmt::Debug::fmt(&**self, f)
        }
    }

    #[cfg(not(ossl110))]
    unsafe fn free(buf: *mut c_char) {
        ::ffi::CRYPTO_free(buf as *mut c_void);
    }

    #[cfg(ossl110)]
    unsafe fn free(buf: *mut c_char) {
        ::ffi::CRYPTO_free(
            buf as *mut c_void,
            concat!(file!(), "\0").as_ptr() as *const c_char,
            line!() as ::libc::c_int,
        );
    }