libc-extra 0.3.2

Additional bits and bobs found in libc libraries that either hasn't been submitted to Rust's official libc crate yet, or has been rejected or requires too much work to integrate
Documentation 
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// This file is part of libc-extra. It is subject to the license terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/libc-extra/master/COPYRIGHT. No part of libc-extra, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
// Copyright © 2016-2018 The developers of libc-extra. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/libc-extra/master/COPYRIGHT.


//noinspection SpellCheckingInspection
/// Used by `fopencookie`.
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub struct cookie_io_functions_t
{
	/// Read function pointer.
	pub read: cookie_read_function_t,
	
	/// Write function pointer.
	pub write: cookie_write_function_t,
	
	/// Seek function pointer.
	pub seek: cookie_seek_function_t,
	
	/// Close function pointer.
	pub close: cookie_close_function_t,
}

impl Default for cookie_io_functions_t
{
	#[inline(always)]
	fn default() -> Self
	{
		Self
		{
			read: Self::default_read,
			write: Self::default_write,
			seek: Self::default_seek,
			close: Self::default_close,
		}
	}
}

impl cookie_io_functions_t
{
	/// No-op cookie read function.
	pub unsafe extern "C" fn default_read(_cookier: *mut c_void, _buf: *mut c_char, _size: size_t) -> ssize_t
	{
		0
	}
	
	/// No-op cookie write function.
	pub unsafe extern "C" fn default_write(_cookier: *mut c_void, _buf: *const c_char, _size: size_t) -> ssize_t
	{
		0
	}
	
	/// No-op cookie seek function.
	pub unsafe extern "C" fn default_seek(_cookier: *mut c_void, _offset: *mut off_t, _whence: c_int) -> c_int
	{
		0
	}
	
	/// No-op cookie close function.
	pub unsafe extern "C" fn default_close(_cookier: *mut c_void) -> c_int
	{
		0
	}
}