mirror of
https://github.com/trapexit/mergerfs.git
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362 lines
11 KiB
C++
362 lines
11 KiB
C++
// Formatting library for C++ - optional OS-specific functionality
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//
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// Copyright (c) 2012 - 2016, Victor Zverovich
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// All rights reserved.
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//
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// For the license information refer to format.h.
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// Disable bogus MSVC warnings.
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#if !defined(_CRT_SECURE_NO_WARNINGS) && defined(_MSC_VER)
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# define _CRT_SECURE_NO_WARNINGS
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#endif
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#include "fmt/os.h"
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#include <climits>
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#if FMT_USE_FCNTL
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# include <sys/stat.h>
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# include <sys/types.h>
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# ifndef _WIN32
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# include <unistd.h>
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# else
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# ifndef WIN32_LEAN_AND_MEAN
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# define WIN32_LEAN_AND_MEAN
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# endif
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# include <io.h>
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# ifndef S_IRUSR
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# define S_IRUSR _S_IREAD
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# endif
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# ifndef S_IWUSR
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# define S_IWUSR _S_IWRITE
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# endif
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# ifndef S_IRGRP
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# define S_IRGRP 0
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# endif
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# ifndef S_IWGRP
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# define S_IWGRP 0
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# endif
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# ifndef S_IROTH
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# define S_IROTH 0
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# endif
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# ifndef S_IWOTH
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# define S_IWOTH 0
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# endif
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# endif // _WIN32
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#endif // FMT_USE_FCNTL
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#ifdef _WIN32
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# include <windows.h>
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#endif
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namespace {
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#ifdef _WIN32
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// Return type of read and write functions.
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using rwresult = int;
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// On Windows the count argument to read and write is unsigned, so convert
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// it from size_t preventing integer overflow.
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inline unsigned convert_rwcount(std::size_t count) {
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return count <= UINT_MAX ? static_cast<unsigned>(count) : UINT_MAX;
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}
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#elif FMT_USE_FCNTL
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// Return type of read and write functions.
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using rwresult = ssize_t;
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inline std::size_t convert_rwcount(std::size_t count) { return count; }
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#endif
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} // namespace
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FMT_BEGIN_NAMESPACE
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#ifdef _WIN32
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detail::utf16_to_utf8::utf16_to_utf8(basic_string_view<wchar_t> s) {
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if (int error_code = convert(s)) {
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FMT_THROW(windows_error(error_code,
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"cannot convert string from UTF-16 to UTF-8"));
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}
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}
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int detail::utf16_to_utf8::convert(basic_string_view<wchar_t> s) {
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if (s.size() > INT_MAX) return ERROR_INVALID_PARAMETER;
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int s_size = static_cast<int>(s.size());
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if (s_size == 0) {
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// WideCharToMultiByte does not support zero length, handle separately.
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buffer_.resize(1);
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buffer_[0] = 0;
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return 0;
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}
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int length = WideCharToMultiByte(CP_UTF8, 0, s.data(), s_size, nullptr, 0,
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nullptr, nullptr);
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if (length == 0) return GetLastError();
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buffer_.resize(length + 1);
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length = WideCharToMultiByte(CP_UTF8, 0, s.data(), s_size, &buffer_[0],
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length, nullptr, nullptr);
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if (length == 0) return GetLastError();
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buffer_[length] = 0;
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return 0;
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}
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namespace detail {
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class system_message {
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system_message(const system_message&) = delete;
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void operator=(const system_message&) = delete;
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unsigned long result_;
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wchar_t* message_;
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static bool is_whitespace(wchar_t c) noexcept {
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return c == L' ' || c == L'\n' || c == L'\r' || c == L'\t' || c == L'\0';
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}
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public:
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explicit system_message(unsigned long error_code)
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: result_(0), message_(nullptr) {
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result_ = FormatMessageW(
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FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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nullptr, error_code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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reinterpret_cast<wchar_t*>(&message_), 0, nullptr);
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if (result_ != 0) {
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while (result_ != 0 && is_whitespace(message_[result_ - 1])) {
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--result_;
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}
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}
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}
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~system_message() { LocalFree(message_); }
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explicit operator bool() const noexcept { return result_ != 0; }
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operator basic_string_view<wchar_t>() const noexcept {
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return basic_string_view<wchar_t>(message_, result_);
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}
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};
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class utf8_system_category final : public std::error_category {
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public:
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const char* name() const noexcept override { return "system"; }
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std::string message(int error_code) const override {
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system_message msg(error_code);
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if (msg) {
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utf16_to_utf8 utf8_message;
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if (utf8_message.convert(msg) == ERROR_SUCCESS) {
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return utf8_message.str();
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}
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}
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return "unknown error";
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}
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};
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} // namespace detail
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FMT_API const std::error_category& system_category() noexcept {
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static const detail::utf8_system_category category;
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return category;
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}
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std::system_error vwindows_error(int err_code, string_view format_str,
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format_args args) {
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auto ec = std::error_code(err_code, system_category());
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return std::system_error(ec, vformat(format_str, args));
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}
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void detail::format_windows_error(detail::buffer<char>& out, int error_code,
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const char* message) noexcept {
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FMT_TRY {
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system_message msg(error_code);
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if (msg) {
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utf16_to_utf8 utf8_message;
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if (utf8_message.convert(msg) == ERROR_SUCCESS) {
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fmt::format_to(buffer_appender<char>(out), "{}: {}", message, utf8_message);
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return;
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}
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}
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}
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FMT_CATCH(...) {}
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format_error_code(out, error_code, message);
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}
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void report_windows_error(int error_code, const char* message) noexcept {
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report_error(detail::format_windows_error, error_code, message);
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}
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#endif // _WIN32
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buffered_file::~buffered_file() noexcept {
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if (file_ && FMT_SYSTEM(fclose(file_)) != 0)
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report_system_error(errno, "cannot close file");
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}
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buffered_file::buffered_file(cstring_view filename, cstring_view mode) {
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FMT_RETRY_VAL(file_, FMT_SYSTEM(fopen(filename.c_str(), mode.c_str())),
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nullptr);
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if (!file_)
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FMT_THROW(system_error(errno, "cannot open file {}", filename.c_str()));
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}
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void buffered_file::close() {
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if (!file_) return;
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int result = FMT_SYSTEM(fclose(file_));
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file_ = nullptr;
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if (result != 0) FMT_THROW(system_error(errno, "cannot close file"));
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}
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int buffered_file::descriptor() const {
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int fd = FMT_POSIX_CALL(fileno(file_));
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if (fd == -1) FMT_THROW(system_error(errno, "cannot get file descriptor"));
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return fd;
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}
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#if FMT_USE_FCNTL
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file::file(cstring_view path, int oflag) {
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# ifdef _WIN32
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using mode_t = int;
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# endif
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constexpr mode_t mode =
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S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
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# if defined(_WIN32) && !defined(__MINGW32__)
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fd_ = -1;
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FMT_POSIX_CALL(sopen_s(&fd_, path.c_str(), oflag, _SH_DENYNO, mode));
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# else
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FMT_RETRY(fd_, FMT_POSIX_CALL(open(path.c_str(), oflag, mode)));
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# endif
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if (fd_ == -1)
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FMT_THROW(system_error(errno, "cannot open file {}", path.c_str()));
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}
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file::~file() noexcept {
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// Don't retry close in case of EINTR!
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// See http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-09/3000.html
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if (fd_ != -1 && FMT_POSIX_CALL(close(fd_)) != 0)
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report_system_error(errno, "cannot close file");
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}
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void file::close() {
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if (fd_ == -1) return;
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// Don't retry close in case of EINTR!
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// See http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-09/3000.html
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int result = FMT_POSIX_CALL(close(fd_));
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fd_ = -1;
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if (result != 0) FMT_THROW(system_error(errno, "cannot close file"));
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}
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long long file::size() const {
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# ifdef _WIN32
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// Use GetFileSize instead of GetFileSizeEx for the case when _WIN32_WINNT
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// is less than 0x0500 as is the case with some default MinGW builds.
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// Both functions support large file sizes.
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DWORD size_upper = 0;
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HANDLE handle = reinterpret_cast<HANDLE>(_get_osfhandle(fd_));
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DWORD size_lower = FMT_SYSTEM(GetFileSize(handle, &size_upper));
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if (size_lower == INVALID_FILE_SIZE) {
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DWORD error = GetLastError();
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if (error != NO_ERROR)
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FMT_THROW(windows_error(GetLastError(), "cannot get file size"));
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}
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unsigned long long long_size = size_upper;
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return (long_size << sizeof(DWORD) * CHAR_BIT) | size_lower;
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# else
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using Stat = struct stat;
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Stat file_stat = Stat();
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if (FMT_POSIX_CALL(fstat(fd_, &file_stat)) == -1)
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FMT_THROW(system_error(errno, "cannot get file attributes"));
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static_assert(sizeof(long long) >= sizeof(file_stat.st_size),
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"return type of file::size is not large enough");
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return file_stat.st_size;
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# endif
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}
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std::size_t file::read(void* buffer, std::size_t count) {
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rwresult result = 0;
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FMT_RETRY(result, FMT_POSIX_CALL(read(fd_, buffer, convert_rwcount(count))));
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if (result < 0) FMT_THROW(system_error(errno, "cannot read from file"));
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return detail::to_unsigned(result);
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}
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std::size_t file::write(const void* buffer, std::size_t count) {
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rwresult result = 0;
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FMT_RETRY(result, FMT_POSIX_CALL(write(fd_, buffer, convert_rwcount(count))));
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if (result < 0) FMT_THROW(system_error(errno, "cannot write to file"));
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return detail::to_unsigned(result);
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}
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file file::dup(int fd) {
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// Don't retry as dup doesn't return EINTR.
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// http://pubs.opengroup.org/onlinepubs/009695399/functions/dup.html
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int new_fd = FMT_POSIX_CALL(dup(fd));
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if (new_fd == -1)
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FMT_THROW(system_error(errno, "cannot duplicate file descriptor {}", fd));
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return file(new_fd);
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}
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void file::dup2(int fd) {
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int result = 0;
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FMT_RETRY(result, FMT_POSIX_CALL(dup2(fd_, fd)));
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if (result == -1) {
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FMT_THROW(system_error(errno, "cannot duplicate file descriptor {} to {}",
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fd_, fd));
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}
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}
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void file::dup2(int fd, std::error_code& ec) noexcept {
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int result = 0;
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FMT_RETRY(result, FMT_POSIX_CALL(dup2(fd_, fd)));
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if (result == -1) ec = std::error_code(errno, std::generic_category());
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}
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void file::pipe(file& read_end, file& write_end) {
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// Close the descriptors first to make sure that assignments don't throw
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// and there are no leaks.
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read_end.close();
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write_end.close();
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int fds[2] = {};
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# ifdef _WIN32
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// Make the default pipe capacity same as on Linux 2.6.11+.
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enum { DEFAULT_CAPACITY = 65536 };
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int result = FMT_POSIX_CALL(pipe(fds, DEFAULT_CAPACITY, _O_BINARY));
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# else
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// Don't retry as the pipe function doesn't return EINTR.
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// http://pubs.opengroup.org/onlinepubs/009696799/functions/pipe.html
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int result = FMT_POSIX_CALL(pipe(fds));
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# endif
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if (result != 0) FMT_THROW(system_error(errno, "cannot create pipe"));
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// The following assignments don't throw because read_fd and write_fd
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// are closed.
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read_end = file(fds[0]);
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write_end = file(fds[1]);
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}
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buffered_file file::fdopen(const char* mode) {
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// Don't retry as fdopen doesn't return EINTR.
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# if defined(__MINGW32__) && defined(_POSIX_)
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FILE* f = ::fdopen(fd_, mode);
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# else
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FILE* f = FMT_POSIX_CALL(fdopen(fd_, mode));
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# endif
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if (!f)
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FMT_THROW(
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system_error(errno, "cannot associate stream with file descriptor"));
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buffered_file bf(f);
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fd_ = -1;
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return bf;
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}
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long getpagesize() {
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# ifdef _WIN32
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SYSTEM_INFO si;
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GetSystemInfo(&si);
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return si.dwPageSize;
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# else
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long size = FMT_POSIX_CALL(sysconf(_SC_PAGESIZE));
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if (size < 0) FMT_THROW(system_error(errno, "cannot get memory page size"));
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return size;
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# endif
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}
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FMT_API void ostream::grow(size_t) {
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if (this->size() == this->capacity()) flush();
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}
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#endif // FMT_USE_FCNTL
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FMT_END_NAMESPACE
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