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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "android-base/errors.h"
#include <windows.h>
#include "android-base/stringprintf.h"
#include "android-base/strings.h"
#include "android-base/utf8.h"
// A Windows error code is a DWORD. It's simpler to use an int error code for
// both Unix and Windows if possible, but if this fails we'll need a different
// function signature for each.
static_assert(sizeof(int) >= sizeof(DWORD),
"Windows system error codes are too large to fit in an int.");
namespace android {
namespace base {
static constexpr DWORD kErrorMessageBufferSize = 256;
std::string SystemErrorCodeToString(int int_error_code) {
WCHAR msgbuf[kErrorMessageBufferSize];
DWORD error_code = int_error_code;
DWORD flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;
DWORD len = FormatMessageW(flags, nullptr, error_code, 0, msgbuf,
kErrorMessageBufferSize, nullptr);
if (len == 0) {
return android::base::StringPrintf(
"Error %lu while retrieving message for error %lu", GetLastError(),
error_code);
}
// Convert UTF-16 to UTF-8.
std::string msg;
if (!android::base::WideToUTF8(msgbuf, &msg)) {
return android::base::StringPrintf(
"Error %lu while converting message for error %lu from UTF-16 to UTF-8",
GetLastError(), error_code);
}
// Messages returned by the system end with line breaks.
msg = android::base::Trim(msg);
// There are many Windows error messages compared to POSIX, so include the
// numeric error code for easier, quicker, accurate identification. Use
// decimal instead of hex because there are decimal ranges like 10000-11999
// for Winsock.
android::base::StringAppendF(&msg, " (%lu)", error_code);
return msg;
}
} // namespace base
} // namespace android
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