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AK: Add Error::from_windows_error(void)

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Also slightly improve Error::from_windows_error(int)
This commit is contained in:
stasoid 2024-12-08 22:00:56 +05:00 • committed by Andrew Kaster
commit 870cce9d11
Notes: github-actions[bot] 2025-02-06 02:28:57 +00:00
5 changed files with 40 additions and 34 deletions
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50
AK/Error.cpp
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@ -1,7 +1,7 @@
/*
* Copyright (c) 2023, Liav A. <liavalb@hotmail.co.il>
* Copyright (c) 2023, Cameron Youell <cameronyouell@gmail.com>
* Copyright (c) 2024, stasoid <stasoid@yahoo.com>
* Copyright (c) 2024-2025, stasoid <stasoid@yahoo.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -11,6 +11,8 @@
# include <AK/ByteString.h>
# include <AK/HashMap.h>
# include <windows.h>
// Comment to prevent clang-format from including windows.h too late
# include <winbase.h>
#endif
namespace AK {
@ -21,31 +23,39 @@ Error Error::from_string_view_or_print_error_and_return_errno(StringView string_
}
#ifdef AK_OS_WINDOWS
Error Error::from_windows_error(DWORD code)
Error Error::from_windows_error(u64 code)
{
static HashMap<DWORD, ByteString> windows_errors;
thread_local HashMap<u64, ByteString> s_windows_errors;
auto string = windows_errors.get(code);
if (string.has_value()) {
auto string = s_windows_errors.get(code);
if (string.has_value())
return Error::from_string_view(string->view());
} else {
char* message = nullptr;
auto size = FormatMessageA(
FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr,
code,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPSTR)&message,
0,
nullptr);
if (size == 0)
return Error::from_string_view_or_print_error_and_return_errno("Unknown error"sv, code);
char* message = nullptr;
auto size = FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr,
static_cast<DWORD>(code),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
reinterpret_cast<LPSTR>(&message),
0,
nullptr);
windows_errors.set(code, { message, size });
LocalFree(message);
return from_windows_error(code);
if (size == 0) {
static char buffer[128];
(void)snprintf(buffer, _countof(buffer), "Error 0x%08lX while getting text of error 0x%08llX", GetLastError(), code);
return Error::from_string_view({ buffer, _countof(buffer) });
}
auto& string_in_map = s_windows_errors.ensure(code, [message, size] { return ByteString { message, size }; });
LocalFree(message);
return Error::from_string_view(string_in_map.view());
}
// This can be used both for generic Windows errors and for winsock errors because WSAGetLastError is forwarded to GetLastError.
Error Error::from_windows_error()
{
return from_windows_error(GetLastError());
}
#endif