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