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Rollup merge of #114983 - crlf0710:formatmsg, r=ChrisDenton

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Usage zero as language id for `FormatMessageW()`

This switches the language selection from using system language (note that this might be different than application language, typically stored as thread ui language) to use `FormatMessageW` default search strategy, which is `neutral` first, then `thread ui lang`, then `user language`, then `system language`, then `English`. (See https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-formatmessagew)

This allows the Rust program to take more control of `std::io::Error`'s message field, by setting up thread ui language themselves before hand (which many programs already do).
This commit is contained in:
Matthias Krüger 2023-08-20 00:28:32 +02:00 committed by GitHub
commit d761a5fe11
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1 changed files with 2 additions and 6 deletions
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8
library/std/src/sys/windows/os.rs
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@ -25,10 +25,6 @@ pub fn errno() -> i32 {
/// Gets a detailed string description for the given error number.
pub fn error_string(mut errnum: i32) -> String {
// This value is calculated from the macro
// MAKELANGID(LANG_SYSTEM_DEFAULT, SUBLANG_SYS_DEFAULT)
let langId = 0x0800 as c::DWORD;
let mut buf = [0 as c::WCHAR; 2048];
unsafe {
@ -56,13 +52,13 @@ pub fn error_string(mut errnum: i32) -> String {
flags | c::FORMAT_MESSAGE_FROM_SYSTEM | c::FORMAT_MESSAGE_IGNORE_INSERTS,
module,
errnum as c::DWORD,
langId,
0,
buf.as_mut_ptr(),
buf.len() as c::DWORD,
ptr::null(),
) as usize;
if res == 0 {
// Sometimes FormatMessageW can fail e.g., system doesn't like langId,
// Sometimes FormatMessageW can fail e.g., system doesn't like 0 as langId,
let fm_err = errno();
return format!("OS Error {errnum} (FormatMessageW() returned error {fm_err})");
}