82 lines
2.5 KiB
Rust
82 lines
2.5 KiB
Rust
//! Implementation of `errno` functionality for Windows.
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//!
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//! Adapted from `src/libstd/sys/windows/os.rs` in the Rust distribution.
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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use core::char::{self, REPLACEMENT_CHARACTER};
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use core::ptr;
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use core::str;
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use windows_sys::Win32::Foundation::{GetLastError, SetLastError, WIN32_ERROR};
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use windows_sys::Win32::System::Diagnostics::Debug::{
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FormatMessageW, FORMAT_MESSAGE_FROM_SYSTEM, FORMAT_MESSAGE_IGNORE_INSERTS,
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};
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use crate::Errno;
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fn from_utf16_lossy<'a>(input: &[u16], output: &'a mut [u8]) -> &'a str {
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let mut output_len = 0;
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for c in char::decode_utf16(input.iter().copied().take_while(|&x| x != 0))
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.map(|x| x.unwrap_or(REPLACEMENT_CHARACTER))
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{
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let c_len = c.len_utf8();
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if c_len > output.len() - output_len {
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break;
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}
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c.encode_utf8(&mut output[output_len..]);
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output_len += c_len;
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}
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unsafe { str::from_utf8_unchecked(&output[..output_len]) }
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}
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pub fn with_description<F, T>(err: Errno, callback: F) -> T
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where
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F: FnOnce(Result<&str, Errno>) -> T,
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{
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// This value is calculated from the macro
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// MAKELANGID(LANG_SYSTEM_DEFAULT, SUBLANG_SYS_DEFAULT)
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let lang_id = 0x0800_u32;
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let mut buf = [0u16; 2048];
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unsafe {
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let res = FormatMessageW(
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FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
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ptr::null_mut(),
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err.0 as u32,
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lang_id,
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buf.as_mut_ptr(),
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buf.len() as u32,
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ptr::null_mut(),
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);
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if res == 0 {
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// Sometimes FormatMessageW can fail e.g. system doesn't like lang_id
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let fm_err = errno();
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return callback(Err(fm_err));
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}
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let mut msg = [0u8; 2048];
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let msg = from_utf16_lossy(&buf[..res as usize], &mut msg[..]);
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// Trim trailing CRLF inserted by FormatMessageW
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callback(Ok(msg.trim_end()))
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}
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}
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pub const STRERROR_NAME: &str = "FormatMessageW";
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pub fn errno() -> Errno {
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unsafe { Errno(GetLastError() as i32) }
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}
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pub fn set_errno(Errno(errno): Errno) {
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unsafe { SetLastError(errno as WIN32_ERROR) }
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}
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