David Pursell | 3222083 | 2016-01-27 08:52:53 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "android-base/errors.h" |
| 18 | |
| 19 | #include <windows.h> |
| 20 | |
| 21 | #include "android-base/stringprintf.h" |
| 22 | #include "android-base/strings.h" |
| 23 | #include "android-base/utf8.h" |
| 24 | |
| 25 | // A Windows error code is a DWORD. It's simpler to use an int error code for |
| 26 | // both Unix and Windows if possible, but if this fails we'll need a different |
| 27 | // function signature for each. |
| 28 | static_assert(sizeof(int) >= sizeof(DWORD), |
| 29 | "Windows system error codes are too large to fit in an int."); |
| 30 | |
| 31 | namespace android { |
| 32 | namespace base { |
| 33 | |
| 34 | static constexpr DWORD kErrorMessageBufferSize = 256; |
| 35 | |
| 36 | std::string SystemErrorCodeToString(int int_error_code) { |
| 37 | WCHAR msgbuf[kErrorMessageBufferSize]; |
| 38 | DWORD error_code = int_error_code; |
| 39 | DWORD flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS; |
| 40 | DWORD len = FormatMessageW(flags, nullptr, error_code, 0, msgbuf, |
| 41 | kErrorMessageBufferSize, nullptr); |
| 42 | if (len == 0) { |
| 43 | return android::base::StringPrintf( |
| 44 | "Error %lu while retrieving message for error %lu", GetLastError(), |
| 45 | error_code); |
| 46 | } |
| 47 | |
| 48 | // Convert UTF-16 to UTF-8. |
| 49 | std::string msg; |
| 50 | if (!android::base::WideToUTF8(msgbuf, &msg)) { |
| 51 | return android::base::StringPrintf( |
| 52 | "Error %lu while converting message for error %lu from UTF-16 to UTF-8", |
| 53 | GetLastError(), error_code); |
| 54 | } |
| 55 | |
| 56 | // Messages returned by the system end with line breaks. |
| 57 | msg = android::base::Trim(msg); |
| 58 | |
| 59 | // There are many Windows error messages compared to POSIX, so include the |
| 60 | // numeric error code for easier, quicker, accurate identification. Use |
| 61 | // decimal instead of hex because there are decimal ranges like 10000-11999 |
| 62 | // for Winsock. |
| 63 | android::base::StringAppendF(&msg, " (%lu)", error_code); |
| 64 | return msg; |
| 65 | } |
| 66 | |
| 67 | } // namespace base |
| 68 | } // namespace android |