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use super::*;
use std::os::raw::c_int;
use std::{
fmt, error
};
macro_rules! opaque {
($obj:expr => $msg:literal $(, $args:expr)*) => {
{
#[derive(Debug)]
struct Opaque<'a, T: ?Sized + ::std::fmt::Debug>(::std::fmt::FormatArgs<'a>, T);
impl<'a, T: ?Sized + ::std::fmt::Debug> ::std::fmt::Display for Opaque<T>
{
#[inline]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
{
use ::std::fmt::Write;
write!(f, "{}: {:?}", self.0, &self.1)
}
}
impl<'a, T: ?Sized + ::std::fmt::Debug> error::Error for Opaque<'a, T>{}
Opaque(::std::format_args!($msg, $(, $args)*), $obj)
}
};
}
pub(crate) use opaque;
macro_rules! os_error {
($fmt:literal $(, $args:expr)*) => {
{
#[derive(Debug)]
struct AdHoc<'a>(::std::fmt::Arguments<'a>);
impl<'a> ::std::fmt::Display for AdHoc<'a>
{
#[inline]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
{
write!(f, "{}", self.0)
}
}
$crate::err::WrappedOSError::last_os_error(AdHoc(::std::format_args!($fmt $(, $args)*)))
}
};
($(#[$outer:meta])* $vis:vis struct $name:ident => $fmt:literal $(; $($rest:tt)*)?) => {
$(#[$outer])*
#[derive(Debug)]
#[repr(transparent)]
$vis struct $name($crate::err::WrappedOSError<&'static str>);
impl ::std::fmt::Display for $name
{
#[inline]
fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> fmt::Result
{
f.write_str($fmt)
}
}
impl ::std::error::Error for $name {
#[inline]
fn source(&self) -> Option<&(dyn ::std::error::Error + 'static)>
{
self.0.source()
}
}
#[allow(unused)]
impl $name {
#[inline(always)]
fn new() -> Self
{
Self($crate::err::WrappedOSError::last_os_error($fmt))
}
#[inline(always)]
fn into_inner(self) -> $crate::err::WrappedOSError<&'static str>
{
self.0
}
}
impl ::std::ops::Deref for $name {
type Target = $crate::err::WrappedOSError<&'static str>;
#[inline]
fn deref(&self) -> &Self::Target
{
&self.0
}
}
impl ::std::ops::DerefMut for $name {
#[inline]
fn deref_mut(&mut self) -> &mut Self::Target
{
&mut self.0
}
}
$(
$crate::os_error! {
$($rest)*
}
)?
};
() => {};
}
pub(crate) use os_error;
const _: () = {
os_error!(struct Test => "Test error");
const fn t<E: ?Sized + error::Error>() {}
fn r<E: ?Sized + error::Error>(_: &E) {}
fn test() {
r(&os_error!("Some error message"));
}
t::<Test>()
};
pub struct WrappedOSError<E: ?Sized>(io::Error, E);
impl<E: fmt::Debug> WrappedOSError<E>
{
pub(crate) fn last_os_error(ctx: E) -> Self
{
Self(io::Error::last_os_error(), ctx)
}
pub(crate) fn from_os_error(raw: c_int, ctx: E) -> Self
{
Self(io::Error::from_raw_os_error(raw), ctx)
}
}
impl<E: ?Sized> WrappedOSError<E>
{
#[inline]
pub fn error(&self) -> &io::Error
{
&self.0
}
#[inline]
pub fn raw_error(&self) -> c_int
{
self.0.raw_os_error().unwrap()
}
#[inline]
pub fn context(&self) -> &E
{
&self.1
}
}
impl<E> From<WrappedOSError<E>> for io::Error
{
#[inline]
fn from(from: WrappedOSError<E>) -> Self
{
from.0
}
}
impl<E: ?Sized> error::Error for WrappedOSError<E>
where WrappedOSError<E>: fmt::Display + fmt::Debug
{
#[inline]
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
Some(&self.0)
}
}
impl<E: ?Sized> fmt::Display for WrappedOSError<E>
where E: fmt::Debug
{
#[inline]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
{
write!(f, "{:?}", &self.1)
}
}
impl<E: ?Sized> fmt::Debug for WrappedOSError<E>
where E: fmt::Display
{
#[inline]
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
{
write!(f, "{}", &self.1)
}
}