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68 lines
2.4 KiB
68 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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