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Windows, protoc: create io_win32.{h,cc}
Create dedicated files for the long-path-aware Windows implementations of open/access/mkdir. This commit updates many BUT NOT ALL usages of <io.h> functions in protobuf's code base. Reason being is that there are no Bazel build rules for the unittest files that include <io.h>, so I decided to leave those alone. Thanks to this commit I can now build Bazel with MSVC without needing a short --output_user_base. Fixes #2634 See #2107 See protocolbuffers/protobuf#2891 Change-Id: I374726452300854a36e4628bb22cb7bbb12f3bad
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third_party/protobuf/3.0.0/src/google/protobuf/io/io_win32.cc
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| // Protocol Buffers - Google's data interchange format | ||
| // Copyright 2008 Google Inc. All rights reserved. | ||
| // https://developers.google.com/protocol-buffers/ | ||
| // | ||
| // Redistribution and use in source and binary forms, with or without | ||
| // modification, are permitted provided that the following conditions are | ||
| // met: | ||
| // | ||
| // * Redistributions of source code must retain the above copyright | ||
| // notice, this list of conditions and the following disclaimer. | ||
| // * Redistributions in binary form must reproduce the above | ||
| // copyright notice, this list of conditions and the following disclaimer | ||
| // in the documentation and/or other materials provided with the | ||
| // distribution. | ||
| // * Neither the name of Google Inc. nor the names of its | ||
| // contributors may be used to endorse or promote products derived from | ||
| // this software without specific prior written permission. | ||
| // | ||
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
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| // Author: laszlocsomor@google.com (Laszlo Csomor) | ||
| // | ||
| // Implementation for long-path-aware open/mkdir/access on Windows. | ||
| // | ||
| // These functions convert the input path to an absolute Windows path | ||
| // with UNC prefix if necessary, then pass that to | ||
| // _wopen/_wmkdir/_waccess (declared in <io.h>) respectively. This | ||
| // allows working with files/directories whose paths is longer than | ||
| // MAX_PATH (260 chars). | ||
| // | ||
| // This file is only used on Windows, it's empty on other platforms. | ||
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| #if defined(_WIN32) | ||
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| #include <Windows.h> | ||
| #include <sys/types.h> | ||
| #include <sys/stat.h> | ||
| #include <fcntl.h> | ||
| #include <io.h> | ||
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| #include <string> | ||
| #include <memory> | ||
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| #include <google/protobuf/io/io_win32.h> | ||
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| namespace google { | ||
| namespace protobuf { | ||
| namespace io { | ||
| namespace win32 { | ||
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| template <typename char_type> | ||
| static bool has_unc_prefix(const std::basic_string<char_type>& path) { | ||
| return path.size() > 4 && path[0] == '\\' && path[1] == '\\' && | ||
| path[2] == '?' && path[3] == '\\'; | ||
| } | ||
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| template <typename char_type> | ||
| static bool is_path_absolute(const std::basic_string<char_type>& path) { | ||
| return (path.size() > 2 && path[1] == ':') || has_unc_prefix(path); | ||
| } | ||
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| template <typename char_type> | ||
| static bool is_separator(char_type c) { | ||
| return c == '/' || c == '\\'; | ||
| } | ||
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| static void replace_directory_separators(WCHAR* p) { | ||
| for (; *p != L'\0'; ++p) { | ||
| if (*p == L'/') { | ||
| *p = L'\\'; | ||
| } | ||
| } | ||
| } | ||
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| static std::wstring get_cwd() { | ||
| DWORD result = ::GetCurrentDirectoryW(0, NULL); | ||
| std::unique_ptr<WCHAR[]> cwd(new WCHAR[result]); | ||
| ::GetCurrentDirectoryW(result, cwd.get()); | ||
| cwd.get()[result - 1] = 0; | ||
| replace_directory_separators(cwd.get()); | ||
| return std::move(std::wstring(cwd.get())); | ||
| } | ||
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| static std::wstring join_paths(const std::wstring& path1, | ||
| const std::wstring& path2) { | ||
| if (path1.empty() || is_path_absolute(path2)) { | ||
| return path2; | ||
| } | ||
| if (path2.empty()) { | ||
| return path1; | ||
| } | ||
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| if (is_separator(path1.back())) { | ||
| return is_separator(path2.front()) | ||
| ? (path1 + path2.substr(1)) | ||
| : (path1 + path2); | ||
| } else { | ||
| return is_separator(path2.front()) | ||
| ? (path1 + path2) | ||
| : (path1 + L'\\' + path2); | ||
| } | ||
| } | ||
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| static std::wstring as_wchar_path(const std::string& path) { | ||
| int len = ::MultiByteToWideChar(CP_UTF8, 0, path.c_str(), path.size(), | ||
| NULL, 0); | ||
| std::unique_ptr<WCHAR[]> wbuf(new WCHAR[len + 1]); | ||
| ::MultiByteToWideChar(CP_UTF8, 0, path.c_str(), path.size(), | ||
| wbuf.get(), len + 1); | ||
| wbuf.get()[len] = 0; | ||
| replace_directory_separators(wbuf.get()); | ||
| return std::move(std::wstring(wbuf.get())); | ||
| } | ||
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| static std::wstring as_windows_path(const std::string& path, | ||
| size_t max_path) { | ||
| std::wstring wpath(as_wchar_path(path)); | ||
| if (!is_path_absolute(path)) { | ||
| wpath = join_paths(get_cwd(), wpath); | ||
| } | ||
| if (wpath.size() >= max_path && !has_unc_prefix(wpath)) { | ||
| wpath = std::wstring(L"\\\\?\\") + wpath; | ||
| } | ||
| return wpath; | ||
| } | ||
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| int open(const char* path, int flags, int mode) { | ||
| return ::_wopen(as_windows_path(path, MAX_PATH).c_str(), flags, mode); | ||
| } | ||
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| int mkdir(const char* name, int _mode) { | ||
| // CreateDirectoryA's limit is 248 chars, see MSDN. | ||
| // https://msdn.microsoft.com/en-us/library/windows/desktop/aa363855(v=vs.85).aspx | ||
| // This limit presumably includes the null-terminator, because other | ||
| // functions that have the MAX_PATH limit, such as CreateFileA, | ||
| // actually include it. | ||
| return ::_wmkdir(as_windows_path(name, 248).c_str()); | ||
| } | ||
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| int access(const char* pathname, int mode) { | ||
| return ::_waccess(as_windows_path(pathname, MAX_PATH).c_str(), mode); | ||
| } | ||
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| } // namespace win32 | ||
| } // namespace io | ||
| } // namespace protobuf | ||
| } // namespace google | ||
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| #endif // defined(_WIN32) |
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