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//! 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.
#[cfg(feature = "std")]
use std::ptr;
use winapi::shared::minwindef::DWORD;
#[cfg(feature = "std")]
use winapi::shared::ntdef::WCHAR;
#[cfg(feature = "std")]
use winapi::um::winbase::{FORMAT_MESSAGE_FROM_SYSTEM, FORMAT_MESSAGE_IGNORE_INSERTS};
use Errno;
#[cfg(feature = "std")]
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 as DWORD;
let mut buf = [0 as WCHAR; 2048];
unsafe {
let res = ::winapi::um::winbase::FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
ptr::null_mut(),
err.0 as DWORD,
lang_id,
buf.as_mut_ptr(),
buf.len() as DWORD,
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 msg = String::from_utf16_lossy(&buf[..res as usize]);
// Trim trailing CRLF inserted by FormatMessageW
#[allow(deprecated)] // TODO: remove when MSRV >= 1.30
callback(Ok(msg.trim_right()))
}
}
#[cfg(feature = "std")]
pub const STRERROR_NAME: &'static str = "FormatMessageW";
pub fn errno() -> Errno {
unsafe {
Errno(::winapi::um::errhandlingapi::GetLastError() as i32)
}
}
pub fn set_errno(Errno(errno): Errno) {
unsafe {
::winapi::um::errhandlingapi::SetLastError(errno as DWORD)
}
}
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