Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

12 files changed, 865 insertions, 0 deletions

diff --git a/vendor/errno/.cargo-checksum.json b/vendor/errno/.cargo-checksum.json
new file mode 100644
index 0000000..8e3161f
--- /dev/null
+++ b/vendor/errno/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"CHANGELOG.md":"b640a4e74c65505290775558e36ede1968ed26a551edaf7574f661891920ff48","Cargo.toml":"329c6992879c5c2ac32dd09263f4d9cad0da477ac9c44e50e6ae503fd9616467","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"8764a597675778ddfd4e25f81b08a05dbcf089ac05662df7613fe67f150e3aa2","README.md":"a1817eb8a0b2208d3f3989202b6af03c8261747b281039d4c7790649b587fd0b","clippy.toml":"6409bb805741d8bedfb1e58eb0ce4b63bd1d384ad5e29b7a3c0997a872f31206","src/hermit.rs":"ad03355bc4d79c180ab3210e1d3edd538eccaaea8d4f9a9b7eb8a0dc2d39b5df","src/lib.rs":"318f864b8cb9296c85f70f9dfb855c552303630b3a9390f147bb4b581b8d8b5c","src/unix.rs":"6ee5c13893fa1114fa1782239f2539f1b0a9554e5ed45cf0ee78729145882032","src/wasi.rs":"c83052e5c45c31e2a4630c00a4d0b92f39205774a4d419b4aa5c06dc5992280c","src/windows.rs":"7cbcdb8e74582f357fa945bb1c44c4d19c1a10bec958da1223305bf68ec35baf"},"package":"a258e46cdc063eb8519c00b9fc845fc47bcfca4130e2f08e88665ceda8474245"}
\ No newline at end of file
diff --git a/vendor/errno/CHANGELOG.md b/vendor/errno/CHANGELOG.md
new file mode 100644
index 0000000..e3add31
--- /dev/null
+++ b/vendor/errno/CHANGELOG.md
@@ -0,0 +1,96 @@
+# [Unreleased]
+
+# [0.3.8] - 2023-11-27
+
+- Update to windows-sys 0.52.
+  [#91](https://github.com/lambda-fairy/rust-errno/pull/91)
+
+- Update minimum Rust version to 1.56
+  [#91](https://github.com/lambda-fairy/rust-errno/pull/91)
+
+# [0.3.7] - 2023-11-15
+
+- Fix `to_string()` handling for unknown error codes
+  [#88](https://github.com/lambda-fairy/rust-errno/pull/88)
+
+# [0.3.6] - 2023-11-07
+
+- Add support for tvOS and watchOS
+  [#84](https://github.com/lambda-fairy/rust-errno/pull/84)
+
+- Added support for vita target
+  [#86](https://github.com/lambda-fairy/rust-errno/pull/86)
+
+# [0.3.5] - 2023-10-08
+
+- Use __errno_location on DragonFly BSD
+  [#82](https://github.com/lambda-fairy/rust-errno/pull/82)
+
+# [0.3.4] - 2023-10-01
+
+- Add GNU/Hurd support
+  [#80](https://github.com/lambda-fairy/rust-errno/pull/80)
+
+# [0.3.3] - 2023-08-28
+
+- Disable "libc/std" in no-std configurations.
+  [#77](https://github.com/lambda-fairy/rust-errno/pull/77)
+
+- Bump errno-dragonfly to 0.1.2
+  [#75](https://github.com/lambda-fairy/rust-errno/pull/75)
+
+- Support for the ESP-IDF framework
+  [#74](https://github.com/lambda-fairy/rust-errno/pull/74)
+
+# [0.3.2] - 2023-07-30
+
+- Fix build on Hermit
+  [#73](https://github.com/lambda-fairy/rust-errno/pull/73)
+
+- Add support for QNX Neutrino
+  [#72](https://github.com/lambda-fairy/rust-errno/pull/72)
+
+# [0.3.1] - 2023-04-08
+
+- Correct link name on redox
+  [#69](https://github.com/lambda-fairy/rust-errno/pull/69)
+
+- Update windows-sys requirement from 0.45 to 0.48
+  [#70](https://github.com/lambda-fairy/rust-errno/pull/70)
+
+# [0.3.0] - 2023-02-12
+
+- Add haiku support
+  [#42](https://github.com/lambda-fairy/rust-errno/pull/42)
+
+- Add AIX support
+  [#54](https://github.com/lambda-fairy/rust-errno/pull/54)
+
+- Add formatting with `#![no_std]`
+  [#44](https://github.com/lambda-fairy/rust-errno/pull/44)
+
+- Switch from `winapi` to `windows-sys` [#55](https://github.com/lambda-fairy/rust-errno/pull/55)
+
+- Update minimum Rust version to 1.48
+  [#48](https://github.com/lambda-fairy/rust-errno/pull/48) [#55](https://github.com/lambda-fairy/rust-errno/pull/55)
+
+- Upgrade to Rust 2018 edition [#59](https://github.com/lambda-fairy/rust-errno/pull/59)
+
+- wasm32-wasi: Use `__errno_location` instead of `feature(thread_local)`. [#66](https://github.com/lambda-fairy/rust-errno/pull/66)
+
+# [0.2.8] - 2021-10-27
+
+- Optionally support no_std
+  [#31](https://github.com/lambda-fairy/rust-errno/pull/31)
+
+[Unreleased]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.8...HEAD
+[0.3.8]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.7...v0.3.8
+[0.3.7]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.6...v0.3.7
+[0.3.6]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.5...v0.3.6
+[0.3.5]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.4...v0.3.5
+[0.3.4]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.3...v0.3.4
+[0.3.3]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.2...v0.3.3
+[0.3.2]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.1...v0.3.2
+[0.3.1]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.0...v0.3.1
+[0.3.0]: https://github.com/lambda-fairy/rust-errno/compare/v0.2.8...v0.3.0
+[0.2.8]: https://github.com/lambda-fairy/rust-errno/compare/v0.2.7...v0.2.8
diff --git a/vendor/errno/Cargo.toml b/vendor/errno/Cargo.toml
new file mode 100644
index 0000000..e1d0bf5
--- /dev/null
+++ b/vendor/errno/Cargo.toml
@@ -0,0 +1,49 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+rust-version = "1.56"
+name = "errno"
+version = "0.3.8"
+authors = ["Chris Wong <lambda.fairy@gmail.com>"]
+description = "Cross-platform interface to the `errno` variable."
+documentation = "https://docs.rs/errno"
+readme = "README.md"
+categories = [
+    "no-std",
+    "os",
+]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/lambda-fairy/rust-errno"
+
+[features]
+default = ["std"]
+std = ["libc/std"]
+
+[target."cfg(target_os=\"hermit\")".dependencies.libc]
+version = "0.2"
+default-features = false
+
+[target."cfg(target_os=\"wasi\")".dependencies.libc]
+version = "0.2"
+default-features = false
+
+[target."cfg(unix)".dependencies.libc]
+version = "0.2"
+default-features = false
+
+[target."cfg(windows)".dependencies.windows-sys]
+version = "0.52"
+features = [
+    "Win32_Foundation",
+    "Win32_System_Diagnostics_Debug",
+]
diff --git a/vendor/errno/LICENSE-APACHE b/vendor/errno/LICENSE-APACHE
new file mode 100644
index 0000000..16fe87b
--- /dev/null
+++ b/vendor/errno/LICENSE-APACHE
@@ -0,0 +1,201 @@
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diff --git a/vendor/errno/LICENSE-MIT b/vendor/errno/LICENSE-MIT
new file mode 100644
index 0000000..66b6578
--- /dev/null
+++ b/vendor/errno/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2014 Chris Wong
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/vendor/errno/README.md b/vendor/errno/README.md
new file mode 100644
index 0000000..6a9a42c
--- /dev/null
+++ b/vendor/errno/README.md
@@ -0,0 +1,62 @@
+# errno [![CI](https://github.com/lambda-fairy/rust-errno/actions/workflows/main.yml/badge.svg)](https://github.com/lambda-fairy/rust-errno/actions/workflows/main.yml) [![Cargo](https://img.shields.io/crates/v/errno.svg)](https://crates.io/crates/errno)
+
+Cross-platform interface to the [`errno`][errno] variable. Works on Rust 1.56 or newer.
+
+Documentation is available at <https://docs.rs/errno>.
+
+[errno]: https://en.wikipedia.org/wiki/Errno.h
+
+
+## Dependency
+
+Add to your `Cargo.toml`:
+
+```toml
+[dependencies]
+errno = "*"
+```
+
+
+## Comparison with `std::io::Error`
+
+The standard library provides [`Error::last_os_error`][last_os_error] which fetches `errno` in the same way.
+
+This crate provides these extra features:
+
+- No heap allocations
+- Optional `#![no_std]` support
+- A `set_errno` function
+
+[last_os_error]: https://doc.rust-lang.org/std/io/struct.Error.html#method.last_os_error
+
+
+## Examples
+
+```rust
+extern crate errno;
+use errno::{Errno, errno, set_errno};
+
+// Get the current value of errno
+let e = errno();
+
+// Set the current value of errno
+set_errno(e);
+
+// Extract the error code as an i32
+let code = e.0;
+
+// Display a human-friendly error message
+println!("Error {}: {}", code, e);
+```
+
+
+## `#![no_std]`
+
+Enable `#![no_std]` support by disabling the default `std` feature:
+
+```toml
+[dependencies]
+errno = { version = "*", default-features = false }
+```
+
+The `Error` impl will be unavailable.
diff --git a/vendor/errno/clippy.toml b/vendor/errno/clippy.toml
new file mode 100644
index 0000000..62ca742
--- /dev/null
+++ b/vendor/errno/clippy.toml
@@ -0,0 +1 @@
+msrv = "1.56"
diff --git a/vendor/errno/src/hermit.rs b/vendor/errno/src/hermit.rs
new file mode 100644
index 0000000..331b6b1
--- /dev/null
+++ b/vendor/errno/src/hermit.rs
@@ -0,0 +1,32 @@
+//! Implementation of `errno` functionality for RustyHermit.
+//!
+//! Currently, the error handling in RustyHermit isn't clearly
+//! defined. At the current stage of RustyHermit, only a placeholder
+//! is provided to be compatible to the classical errno interface.
+
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use crate::Errno;
+
+pub fn with_description<F, T>(_err: Errno, callback: F) -> T
+where
+    F: FnOnce(Result<&str, Errno>) -> T,
+{
+    callback(Ok("unknown error"))
+}
+
+pub const STRERROR_NAME: &str = "strerror_r";
+
+pub fn errno() -> Errno {
+    Errno(0)
+}
+
+pub fn set_errno(_: Errno) {}
diff --git a/vendor/errno/src/lib.rs b/vendor/errno/src/lib.rs
new file mode 100644
index 0000000..20875b5
--- /dev/null
+++ b/vendor/errno/src/lib.rs
@@ -0,0 +1,156 @@
+//! Cross-platform interface to the `errno` variable.
+//!
+//! # Examples
+//! ```
+//! use errno::{Errno, errno, set_errno};
+//!
+//! // Get the current value of errno
+//! let e = errno();
+//!
+//! // Set the current value of errno
+//! set_errno(e);
+//!
+//! // Extract the error code as an i32
+//! let code = e.0;
+//!
+//! // Display a human-friendly error message
+//! println!("Error {}: {}", code, e);
+//! ```
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg_attr(unix, path = "unix.rs")]
+#[cfg_attr(windows, path = "windows.rs")]
+#[cfg_attr(target_os = "wasi", path = "wasi.rs")]
+#[cfg_attr(target_os = "hermit", path = "hermit.rs")]
+mod sys;
+
+use core::fmt;
+#[cfg(feature = "std")]
+use std::error::Error;
+#[cfg(feature = "std")]
+use std::io;
+
+/// Wraps a platform-specific error code.
+///
+/// The `Display` instance maps the code to a human-readable string. It
+/// calls [`strerror_r`][1] under POSIX, and [`FormatMessageW`][2] on
+/// Windows.
+///
+/// [1]: http://pubs.opengroup.org/onlinepubs/009695399/functions/strerror.html
+/// [2]: https://msdn.microsoft.com/en-us/library/windows/desktop/ms679351%28v=vs.85%29.aspx
+#[derive(Copy, Clone, Eq, Ord, PartialEq, PartialOrd, Hash)]
+pub struct Errno(pub i32);
+
+impl fmt::Debug for Errno {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        sys::with_description(*self, |desc| {
+            fmt.debug_struct("Errno")
+                .field("code", &self.0)
+                .field("description", &desc.ok())
+                .finish()
+        })
+    }
+}
+
+impl fmt::Display for Errno {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        sys::with_description(*self, |desc| match desc {
+            Ok(desc) => fmt.write_str(desc),
+            Err(fm_err) => write!(
+                fmt,
+                "OS error {} ({} returned error {})",
+                self.0,
+                sys::STRERROR_NAME,
+                fm_err.0
+            ),
+        })
+    }
+}
+
+impl From<Errno> for i32 {
+    fn from(e: Errno) -> Self {
+        e.0
+    }
+}
+
+#[cfg(feature = "std")]
+impl Error for Errno {
+    // TODO: Remove when MSRV >= 1.27
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "system error"
+    }
+}
+
+#[cfg(feature = "std")]
+impl From<Errno> for io::Error {
+    fn from(errno: Errno) -> Self {
+        io::Error::from_raw_os_error(errno.0)
+    }
+}
+
+/// Returns the platform-specific value of `errno`.
+pub fn errno() -> Errno {
+    sys::errno()
+}
+
+/// Sets the platform-specific value of `errno`.
+pub fn set_errno(err: Errno) {
+    sys::set_errno(err)
+}
+
+#[test]
+fn it_works() {
+    let x = errno();
+    set_errno(x);
+}
+
+#[cfg(feature = "std")]
+#[test]
+fn it_works_with_to_string() {
+    let x = errno();
+    let _ = x.to_string();
+}
+
+#[cfg(feature = "std")]
+#[test]
+fn check_description() {
+    let expect = if cfg!(windows) {
+        "Incorrect function."
+    } else if cfg!(target_os = "illumos") {
+        "Not owner"
+    } else if cfg!(target_os = "wasi") {
+        "Argument list too long"
+    } else if cfg!(target_os = "haiku") {
+        "Operation not allowed"
+    } else {
+        "Operation not permitted"
+    };
+
+    let errno_code = if cfg!(target_os = "haiku") {
+        -2147483633
+    } else {
+        1
+    };
+    set_errno(Errno(errno_code));
+
+    assert_eq!(errno().to_string(), expect);
+    assert_eq!(
+        format!("{:?}", errno()),
+        format!(
+            "Errno {{ code: {}, description: Some({:?}) }}",
+            errno_code, expect
+        )
+    );
+}
+
+#[cfg(feature = "std")]
+#[test]
+fn check_error_into_errno() {
+    const ERROR_CODE: i32 = 1;
+
+    let error = io::Error::from_raw_os_error(ERROR_CODE);
+    let new_error: io::Error = Errno(ERROR_CODE).into();
+    assert_eq!(error.kind(), new_error.kind());
+}
diff --git a/vendor/errno/src/unix.rs b/vendor/errno/src/unix.rs
new file mode 100644
index 0000000..18951e4
--- /dev/null
+++ b/vendor/errno/src/unix.rs
@@ -0,0 +1,101 @@
+//! Implementation of `errno` functionality for Unix systems.
+//!
+//! Adapted from `src/libstd/sys/unix/os.rs` in the Rust distribution.
+
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use core::str;
+use libc::{self, c_int, size_t, strerror_r, strlen};
+
+use crate::Errno;
+
+fn from_utf8_lossy(input: &[u8]) -> &str {
+    match str::from_utf8(input) {
+        Ok(valid) => valid,
+        Err(error) => unsafe { str::from_utf8_unchecked(&input[..error.valid_up_to()]) },
+    }
+}
+
+pub fn with_description<F, T>(err: Errno, callback: F) -> T
+where
+    F: FnOnce(Result<&str, Errno>) -> T,
+{
+    let mut buf = [0u8; 1024];
+    let c_str = unsafe {
+        let rc = strerror_r(err.0, buf.as_mut_ptr() as *mut _, buf.len() as size_t);
+        if rc != 0 {
+            // Handle negative return codes for compatibility with glibc < 2.13
+            let fm_err = match rc < 0 {
+                true => errno(),
+                false => Errno(rc),
+            };
+            if fm_err != Errno(libc::ERANGE) {
+                return callback(Err(fm_err));
+            }
+        }
+        let c_str_len = strlen(buf.as_ptr() as *const _);
+        &buf[..c_str_len]
+    };
+    callback(Ok(from_utf8_lossy(c_str)))
+}
+
+pub const STRERROR_NAME: &str = "strerror_r";
+
+pub fn errno() -> Errno {
+    unsafe { Errno(*errno_location()) }
+}
+
+pub fn set_errno(Errno(errno): Errno) {
+    unsafe {
+        *errno_location() = errno;
+    }
+}
+
+extern "C" {
+    #[cfg_attr(
+        any(
+            target_os = "macos",
+            target_os = "ios",
+            target_os = "tvos",
+            target_os = "watchos",
+            target_os = "freebsd"
+        ),
+        link_name = "__error"
+    )]
+    #[cfg_attr(
+        any(
+            target_os = "openbsd",
+            target_os = "netbsd",
+            target_os = "bitrig",
+            target_os = "android",
+            target_os = "espidf",
+            target_env = "newlib"
+        ),
+        link_name = "__errno"
+    )]
+    #[cfg_attr(
+        any(target_os = "solaris", target_os = "illumos"),
+        link_name = "___errno"
+    )]
+    #[cfg_attr(target_os = "haiku", link_name = "_errnop")]
+    #[cfg_attr(
+        any(
+            target_os = "linux",
+            target_os = "hurd",
+            target_os = "redox",
+            target_os = "dragonfly"
+        ),
+        link_name = "__errno_location"
+    )]
+    #[cfg_attr(target_os = "aix", link_name = "_Errno")]
+    #[cfg_attr(target_os = "nto", link_name = "__get_errno_ptr")]
+    fn errno_location() -> *mut c_int;
+}
diff --git a/vendor/errno/src/wasi.rs b/vendor/errno/src/wasi.rs
new file mode 100644
index 0000000..404d7d5
--- /dev/null
+++ b/vendor/errno/src/wasi.rs
@@ -0,0 +1,60 @@
+//! Implementation of `errno` functionality for WASI.
+//!
+//! Adapted from `unix.rs`.
+
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use core::str;
+use libc::{self, c_int, size_t, strerror_r, strlen};
+
+use crate::Errno;
+
+fn from_utf8_lossy(input: &[u8]) -> &str {
+    match str::from_utf8(input) {
+        Ok(valid) => valid,
+        Err(error) => unsafe { str::from_utf8_unchecked(&input[..error.valid_up_to()]) },
+    }
+}
+
+pub fn with_description<F, T>(err: Errno, callback: F) -> T
+where
+    F: FnOnce(Result<&str, Errno>) -> T,
+{
+    let mut buf = [0u8; 1024];
+    let c_str = unsafe {
+        let rc = strerror_r(err.0, buf.as_mut_ptr() as *mut _, buf.len() as size_t);
+        if rc != 0 {
+            let fm_err = Errno(rc);
+            if fm_err != Errno(libc::ERANGE) {
+                return callback(Err(fm_err));
+            }
+        }
+        let c_str_len = strlen(buf.as_ptr() as *const _);
+        &buf[..c_str_len]
+    };
+    callback(Ok(from_utf8_lossy(c_str)))
+}
+
+pub const STRERROR_NAME: &str = "strerror_r";
+
+pub fn errno() -> Errno {
+    unsafe { Errno(*__errno_location()) }
+}
+
+pub fn set_errno(Errno(new_errno): Errno) {
+    unsafe {
+        *__errno_location() = new_errno;
+    }
+}
+
+extern "C" {
+    fn __errno_location() -> *mut c_int;
+}
diff --git a/vendor/errno/src/windows.rs b/vendor/errno/src/windows.rs
new file mode 100644
index 0000000..9c7c0e4
--- /dev/null
+++ b/vendor/errno/src/windows.rs
@@ -0,0 +1,81 @@
+//! Implementation of `errno` functionality for Windows.
+//!
+//! Adapted from `src/libstd/sys/windows/os.rs` in the Rust distribution.
+
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use core::char::{self, REPLACEMENT_CHARACTER};
+use core::ptr;
+use core::str;
+use windows_sys::Win32::Foundation::{GetLastError, SetLastError, WIN32_ERROR};
+use windows_sys::Win32::System::Diagnostics::Debug::{
+    FormatMessageW, FORMAT_MESSAGE_FROM_SYSTEM, FORMAT_MESSAGE_IGNORE_INSERTS,
+};
+
+use crate::Errno;
+
+fn from_utf16_lossy<'a>(input: &[u16], output: &'a mut [u8]) -> &'a str {
+    let mut output_len = 0;
+    for c in char::decode_utf16(input.iter().copied().take_while(|&x| x != 0))
+        .map(|x| x.unwrap_or(REPLACEMENT_CHARACTER))
+    {
+        let c_len = c.len_utf8();
+        if c_len > output.len() - output_len {
+            break;
+        }
+        c.encode_utf8(&mut output[output_len..]);
+        output_len += c_len;
+    }
+    unsafe { str::from_utf8_unchecked(&output[..output_len]) }
+}
+
+pub fn with_description<F, T>(err: Errno, callback: F) -> T
+where
+    F: FnOnce(Result<&str, Errno>) -> T,
+{
+    // This value is calculated from the macro
+    // MAKELANGID(LANG_SYSTEM_DEFAULT, SUBLANG_SYS_DEFAULT)
+    let lang_id = 0x0800_u32;
+
+    let mut buf = [0u16; 2048];
+
+    unsafe {
+        let res = FormatMessageW(
+            FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+            ptr::null_mut(),
+            err.0 as u32,
+            lang_id,
+            buf.as_mut_ptr(),
+            buf.len() as u32,
+            ptr::null_mut(),
+        );
+        if res == 0 {
+            // Sometimes FormatMessageW can fail e.g. system doesn't like lang_id
+            let fm_err = errno();
+            return callback(Err(fm_err));
+        }
+
+        let mut msg = [0u8; 2048];
+        let msg = from_utf16_lossy(&buf[..res as usize], &mut msg[..]);
+        // Trim trailing CRLF inserted by FormatMessageW
+        callback(Ok(msg.trim_end()))
+    }
+}
+
+pub const STRERROR_NAME: &str = "FormatMessageW";
+
+pub fn errno() -> Errno {
+    unsafe { Errno(GetLastError() as i32) }
+}
+
+pub fn set_errno(Errno(errno): Errno) {
+    unsafe { SetLastError(errno as WIN32_ERROR) }
+}