1.1.0
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NotRin7
248
src/fs.cpp
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248
src/fs.cpp
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// Copyright (c) 2017-2019 The Palladium Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <fs.h>
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#ifndef WIN32
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#include <fcntl.h>
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#include <string>
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#include <sys/file.h>
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#include <sys/utsname.h>
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#else
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#ifndef NOMINMAX
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#define NOMINMAX
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#endif
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#include <codecvt>
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#include <windows.h>
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#endif
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namespace fsbridge {
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FILE *fopen(const fs::path& p, const char *mode)
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{
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#ifndef WIN32
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return ::fopen(p.string().c_str(), mode);
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#else
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std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>,wchar_t> utf8_cvt;
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return ::_wfopen(p.wstring().c_str(), utf8_cvt.from_bytes(mode).c_str());
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#endif
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}
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#ifndef WIN32
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static std::string GetErrorReason() {
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return std::strerror(errno);
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}
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FileLock::FileLock(const fs::path& file)
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{
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fd = open(file.string().c_str(), O_RDWR);
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if (fd == -1) {
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reason = GetErrorReason();
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}
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}
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FileLock::~FileLock()
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{
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if (fd != -1) {
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close(fd);
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}
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}
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static bool IsWSL()
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{
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struct utsname uname_data;
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return uname(&uname_data) == 0 && std::string(uname_data.version).find("Microsoft") != std::string::npos;
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}
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bool FileLock::TryLock()
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{
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if (fd == -1) {
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return false;
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}
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// Exclusive file locking is broken on WSL using fcntl (issue #18622)
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// This workaround can be removed once the bug on WSL is fixed
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static const bool is_wsl = IsWSL();
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if (is_wsl) {
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if (flock(fd, LOCK_EX | LOCK_NB) == -1) {
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reason = GetErrorReason();
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return false;
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}
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} else {
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struct flock lock;
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lock.l_type = F_WRLCK;
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lock.l_whence = SEEK_SET;
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lock.l_start = 0;
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lock.l_len = 0;
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if (fcntl(fd, F_SETLK, &lock) == -1) {
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reason = GetErrorReason();
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return false;
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}
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}
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return true;
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}
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#else
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static std::string GetErrorReason() {
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wchar_t* err;
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FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
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nullptr, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), reinterpret_cast<WCHAR*>(&err), 0, nullptr);
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std::wstring err_str(err);
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LocalFree(err);
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return std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>>().to_bytes(err_str);
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}
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FileLock::FileLock(const fs::path& file)
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{
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hFile = CreateFileW(file.wstring().c_str(), GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
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nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
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if (hFile == INVALID_HANDLE_VALUE) {
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reason = GetErrorReason();
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}
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}
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FileLock::~FileLock()
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{
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if (hFile != INVALID_HANDLE_VALUE) {
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CloseHandle(hFile);
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}
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}
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bool FileLock::TryLock()
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{
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if (hFile == INVALID_HANDLE_VALUE) {
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return false;
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}
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_OVERLAPPED overlapped = {0};
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if (!LockFileEx(hFile, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, 0, std::numeric_limits<DWORD>::max(), std::numeric_limits<DWORD>::max(), &overlapped)) {
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reason = GetErrorReason();
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return false;
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}
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return true;
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}
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#endif
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std::string get_filesystem_error_message(const fs::filesystem_error& e)
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{
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#ifndef WIN32
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return e.what();
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#else
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// Convert from Multi Byte to utf-16
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std::string mb_string(e.what());
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int size = MultiByteToWideChar(CP_ACP, 0, mb_string.data(), mb_string.size(), nullptr, 0);
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std::wstring utf16_string(size, L'\0');
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MultiByteToWideChar(CP_ACP, 0, mb_string.data(), mb_string.size(), &*utf16_string.begin(), size);
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// Convert from utf-16 to utf-8
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return std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>, wchar_t>().to_bytes(utf16_string);
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#endif
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}
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#ifdef WIN32
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#ifdef __GLIBCXX__
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// reference: https://github.com/gcc-mirror/gcc/blob/gcc-7_3_0-release/libstdc%2B%2B-v3/include/std/fstream#L270
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static std::string openmodeToStr(std::ios_base::openmode mode)
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{
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switch (mode & ~std::ios_base::ate) {
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case std::ios_base::out:
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case std::ios_base::out | std::ios_base::trunc:
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return "w";
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case std::ios_base::out | std::ios_base::app:
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case std::ios_base::app:
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return "a";
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case std::ios_base::in:
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return "r";
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case std::ios_base::in | std::ios_base::out:
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return "r+";
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case std::ios_base::in | std::ios_base::out | std::ios_base::trunc:
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return "w+";
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case std::ios_base::in | std::ios_base::out | std::ios_base::app:
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case std::ios_base::in | std::ios_base::app:
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return "a+";
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case std::ios_base::out | std::ios_base::binary:
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case std::ios_base::out | std::ios_base::trunc | std::ios_base::binary:
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return "wb";
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case std::ios_base::out | std::ios_base::app | std::ios_base::binary:
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case std::ios_base::app | std::ios_base::binary:
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return "ab";
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case std::ios_base::in | std::ios_base::binary:
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return "rb";
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case std::ios_base::in | std::ios_base::out | std::ios_base::binary:
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return "r+b";
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case std::ios_base::in | std::ios_base::out | std::ios_base::trunc | std::ios_base::binary:
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return "w+b";
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case std::ios_base::in | std::ios_base::out | std::ios_base::app | std::ios_base::binary:
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case std::ios_base::in | std::ios_base::app | std::ios_base::binary:
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return "a+b";
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default:
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return std::string();
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}
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}
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void ifstream::open(const fs::path& p, std::ios_base::openmode mode)
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{
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close();
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mode |= std::ios_base::in;
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m_file = fsbridge::fopen(p, openmodeToStr(mode).c_str());
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if (m_file == nullptr) {
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return;
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}
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m_filebuf = __gnu_cxx::stdio_filebuf<char>(m_file, mode);
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rdbuf(&m_filebuf);
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if (mode & std::ios_base::ate) {
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seekg(0, std::ios_base::end);
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}
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}
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void ifstream::close()
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{
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if (m_file != nullptr) {
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m_filebuf.close();
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fclose(m_file);
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}
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m_file = nullptr;
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}
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void ofstream::open(const fs::path& p, std::ios_base::openmode mode)
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{
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close();
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mode |= std::ios_base::out;
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m_file = fsbridge::fopen(p, openmodeToStr(mode).c_str());
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if (m_file == nullptr) {
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return;
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}
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m_filebuf = __gnu_cxx::stdio_filebuf<char>(m_file, mode);
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rdbuf(&m_filebuf);
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if (mode & std::ios_base::ate) {
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seekp(0, std::ios_base::end);
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}
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}
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void ofstream::close()
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{
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if (m_file != nullptr) {
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m_filebuf.close();
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fclose(m_file);
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}
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m_file = nullptr;
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}
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#else // __GLIBCXX__
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static_assert(sizeof(*fs::path().BOOST_FILESYSTEM_C_STR) == sizeof(wchar_t),
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"Warning: This build is using boost::filesystem ofstream and ifstream "
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"implementations which will fail to open paths containing multibyte "
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"characters. You should delete this static_assert to ignore this warning, "
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"or switch to a different C++ standard library like the Microsoft C++ "
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"Standard Library (where boost uses non-standard extensions to construct "
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"stream objects with wide filenames), or the GNU libstdc++ library (where "
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"a more complicated workaround has been implemented above).");
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#endif // __GLIBCXX__
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#endif // WIN32
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} // fsbridge
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