blame: source/misc/embedded_libs/fmt-8.1.1/src/os.cc

// Formatting library for C++ - optional OS-specific functionality

//

// Copyright (c) 2012 - 2016, Victor Zverovich

// All rights reserved.

//

// For the license information refer to format.h.

// Disable bogus MSVC warnings.

#if !defined(_CRT_SECURE_NO_WARNINGS) && defined(_MSC_VER)

#  define _CRT_SECURE_NO_WARNINGS

#endif

#include "fmt/os.h"

#include <climits>

#if FMT_USE_FCNTL

#  include <sys/stat.h>

#  include <sys/types.h>

#  ifndef _WIN32

#    include <unistd.h>

#  else

#    ifndef WIN32_LEAN_AND_MEAN

#      define WIN32_LEAN_AND_MEAN

#    endif

#    include <io.h>

#    ifndef S_IRUSR

#      define S_IRUSR _S_IREAD

#    endif

#    ifndef S_IWUSR

#      define S_IWUSR _S_IWRITE

#    endif

#    ifndef S_IRGRP

#      define S_IRGRP 0

#    endif

#    ifndef S_IROTH

#      define S_IROTH 0

#    endif

#  endif  // _WIN32

#endif    // FMT_USE_FCNTL

#ifdef _WIN32

#  include <windows.h>

#endif

#ifdef fileno

#  undef fileno

#endif

namespace {

#ifdef _WIN32

// Return type of read and write functions.

using rwresult = int;

// On Windows the count argument to read and write is unsigned, so convert

// it from size_t preventing integer overflow.

inline unsigned convert_rwcount(std::size_t count) {

  return count <= UINT_MAX ? static_cast<unsigned>(count) : UINT_MAX;

}

#elif FMT_USE_FCNTL

// Return type of read and write functions.

using rwresult = ssize_t;

inline std::size_t convert_rwcount(std::size_t count) { return count; }

#endif

}  // namespace

FMT_BEGIN_NAMESPACE

#ifdef _WIN32

detail::utf16_to_utf8::utf16_to_utf8(basic_string_view<wchar_t> s) {

  if (int error_code = convert(s)) {

    FMT_THROW(windows_error(error_code,

                            "cannot convert string from UTF-16 to UTF-8"));

  }

}

int detail::utf16_to_utf8::convert(basic_string_view<wchar_t> s) {

  if (s.size() > INT_MAX) return ERROR_INVALID_PARAMETER;

  int s_size = static_cast<int>(s.size());

  if (s_size == 0) {

    // WideCharToMultiByte does not support zero length, handle separately.

    buffer_.resize(1);

    buffer_[0] = 0;

    return 0;

  }

  int length = WideCharToMultiByte(CP_UTF8, 0, s.data(), s_size, nullptr, 0,

                                   nullptr, nullptr);

  if (length == 0) return GetLastError();

  buffer_.resize(length + 1);

  length = WideCharToMultiByte(CP_UTF8, 0, s.data(), s_size, &buffer_[0],

                               length, nullptr, nullptr);

  if (length == 0) return GetLastError();

  buffer_[length] = 0;

  return 0;

}

namespace detail {

class system_message {

  system_message(const system_message&) = delete;

  void operator=(const system_message&) = delete;

  unsigned long result_;

  wchar_t* message_;

  static bool is_whitespace(wchar_t c) FMT_NOEXCEPT {

    return c == L' ' || c == L'\n' || c == L'\r' || c == L'\t' || c == L'\0';

  }

 public:

  explicit system_message(unsigned long error_code)

      : result_(0), message_(nullptr) {

    result_ = FormatMessageW(

        FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |

            FORMAT_MESSAGE_IGNORE_INSERTS,

        nullptr, error_code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

        reinterpret_cast<wchar_t*>(&message_), 0, nullptr);

    if (result_ != 0) {

      while (result_ != 0 && is_whitespace(message_[result_ - 1])) {

        --result_;

      }

    }

  }

  ~system_message() { LocalFree(message_); }

  explicit operator bool() const FMT_NOEXCEPT { return result_ != 0; }

  operator basic_string_view<wchar_t>() const FMT_NOEXCEPT {

    return basic_string_view<wchar_t>(message_, result_);

  }

};

class utf8_system_category final : public std::error_category {

 public:

  const char* name() const FMT_NOEXCEPT override { return "system"; }

  std::string message(int error_code) const override {

    system_message msg(error_code);

    if (msg) {

      utf16_to_utf8 utf8_message;

      if (utf8_message.convert(msg) == ERROR_SUCCESS) {

        return utf8_message.str();

      }

    }

    return "unknown error";

  }

};

}  // namespace detail

FMT_API const std::error_category& system_category() FMT_NOEXCEPT {

  static const detail::utf8_system_category category;

  return category;

}

std::system_error vwindows_error(int err_code, string_view format_str,

                                 format_args args) {

  auto ec = std::error_code(err_code, system_category());

  return std::system_error(ec, vformat(format_str, args));

}

void detail::format_windows_error(detail::buffer<char>& out, int error_code,

                                  const char* message) FMT_NOEXCEPT {

  FMT_TRY {

    system_message msg(error_code);

    if (msg) {

      utf16_to_utf8 utf8_message;

      if (utf8_message.convert(msg) == ERROR_SUCCESS) {

        format_to(buffer_appender<char>(out), "{}: {}", message, utf8_message);

        return;

      }

    }

  }

  FMT_CATCH(...) {}

  format_error_code(out, error_code, message);

}

void report_windows_error(int error_code, const char* message) FMT_NOEXCEPT {

  report_error(detail::format_windows_error, error_code, message);

}

#endif  // _WIN32

buffered_file::~buffered_file() FMT_NOEXCEPT {

  if (file_ && FMT_SYSTEM(fclose(file_)) != 0)

    report_system_error(errno, "cannot close file");

}

buffered_file::buffered_file(cstring_view filename, cstring_view mode) {

  FMT_RETRY_VAL(file_, FMT_SYSTEM(fopen(filename.c_str(), mode.c_str())),

                nullptr);

  if (!file_)

    FMT_THROW(system_error(errno, "cannot open file {}", filename.c_str()));

}

void buffered_file::close() {

  if (!file_) return;

  int result = FMT_SYSTEM(fclose(file_));

  file_ = nullptr;

  if (result != 0) FMT_THROW(system_error(errno, "cannot close file"));

}

// A macro used to prevent expansion of fileno on broken versions of MinGW.

#define FMT_ARGS

int buffered_file::fileno() const {

  int fd = FMT_POSIX_CALL(fileno FMT_ARGS(file_));

  if (fd == -1) FMT_THROW(system_error(errno, "cannot get file descriptor"));

  return fd;

}

#if FMT_USE_FCNTL

file::file(cstring_view path, int oflag) {

#  ifdef _WIN32

  using mode_t = int;

#  endif

  mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;

#  if defined(_WIN32) && !defined(__MINGW32__)

  fd_ = -1;

  FMT_POSIX_CALL(sopen_s(&fd_, path.c_str(), oflag, _SH_DENYNO, mode));

#  else

  FMT_RETRY(fd_, FMT_POSIX_CALL(open(path.c_str(), oflag, mode)));

#  endif

  if (fd_ == -1)

    FMT_THROW(system_error(errno, "cannot open file {}", path.c_str()));

}

file::~file() FMT_NOEXCEPT {

  // Don't retry close in case of EINTR!

  // See http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-09/3000.html

  if (fd_ != -1 && FMT_POSIX_CALL(close(fd_)) != 0)

    report_system_error(errno, "cannot close file");

}

void file::close() {

  if (fd_ == -1) return;

  // Don't retry close in case of EINTR!

  // See http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-09/3000.html

  int result = FMT_POSIX_CALL(close(fd_));

  fd_ = -1;

  if (result != 0) FMT_THROW(system_error(errno, "cannot close file"));

}

long long file::size() const {

#  ifdef _WIN32

  // Use GetFileSize instead of GetFileSizeEx for the case when _WIN32_WINNT

  // is less than 0x0500 as is the case with some default MinGW builds.

  // Both functions support large file sizes.

  DWORD size_upper = 0;

  HANDLE handle = reinterpret_cast<HANDLE>(_get_osfhandle(fd_));

  DWORD size_lower = FMT_SYSTEM(GetFileSize(handle, &size_upper));

  if (size_lower == INVALID_FILE_SIZE) {

    DWORD error = GetLastError();

    if (error != NO_ERROR)

      FMT_THROW(windows_error(GetLastError(), "cannot get file size"));

  }

  unsigned long long long_size = size_upper;

  return (long_size << sizeof(DWORD) * CHAR_BIT) | size_lower;

#  else

  using Stat = struct stat;

  Stat file_stat = Stat();

  if (FMT_POSIX_CALL(fstat(fd_, &file_stat)) == -1)

    FMT_THROW(system_error(errno, "cannot get file attributes"));

  static_assert(sizeof(long long) >= sizeof(file_stat.st_size),

                "return type of file::size is not large enough");

  return file_stat.st_size;

#  endif

}

std::size_t file::read(void* buffer, std::size_t count) {

  rwresult result = 0;

  FMT_RETRY(result, FMT_POSIX_CALL(read(fd_, buffer, convert_rwcount(count))));

  if (result < 0) FMT_THROW(system_error(errno, "cannot read from file"));

  return detail::to_unsigned(result);

}

std::size_t file::write(const void* buffer, std::size_t count) {

  rwresult result = 0;

  FMT_RETRY(result, FMT_POSIX_CALL(write(fd_, buffer, convert_rwcount(count))));

  if (result < 0) FMT_THROW(system_error(errno, "cannot write to file"));

  return detail::to_unsigned(result);

}

file file::dup(int fd) {

  // Don't retry as dup doesn't return EINTR.

  // http://pubs.opengroup.org/onlinepubs/009695399/functions/dup.html

  int new_fd = FMT_POSIX_CALL(dup(fd));

  if (new_fd == -1)

    FMT_THROW(system_error(errno, "cannot duplicate file descriptor {}", fd));

  return file(new_fd);

}

void file::dup2(int fd) {

  int result = 0;

  FMT_RETRY(result, FMT_POSIX_CALL(dup2(fd_, fd)));

  if (result == -1) {

    FMT_THROW(system_error(errno, "cannot duplicate file descriptor {} to {}",

                           fd_, fd));

  }

}

void file::dup2(int fd, std::error_code& ec) FMT_NOEXCEPT {

  int result = 0;

  FMT_RETRY(result, FMT_POSIX_CALL(dup2(fd_, fd)));

  if (result == -1) ec = std::error_code(errno, std::generic_category());

}

void file::pipe(file& read_end, file& write_end) {

  // Close the descriptors first to make sure that assignments don't throw

  // and there are no leaks.

  read_end.close();

  write_end.close();

  int fds[2] = {};

#  ifdef _WIN32

  // Make the default pipe capacity same as on Linux 2.6.11+.

  enum { DEFAULT_CAPACITY = 65536 };

  int result = FMT_POSIX_CALL(pipe(fds, DEFAULT_CAPACITY, _O_BINARY));

#  else

  // Don't retry as the pipe function doesn't return EINTR.

  // http://pubs.opengroup.org/onlinepubs/009696799/functions/pipe.html

  int result = FMT_POSIX_CALL(pipe(fds));

#  endif

  if (result != 0) FMT_THROW(system_error(errno, "cannot create pipe"));

  // The following assignments don't throw because read_fd and write_fd

  // are closed.

  read_end = file(fds[0]);

  write_end = file(fds[1]);

}

buffered_file file::fdopen(const char* mode) {

// Don't retry as fdopen doesn't return EINTR.

#  if defined(__MINGW32__) && defined(_POSIX_)

  FILE* f = ::fdopen(fd_, mode);

#  else

  FILE* f = FMT_POSIX_CALL(fdopen(fd_, mode));

#  endif

  if (!f)

    FMT_THROW(

        system_error(errno, "cannot associate stream with file descriptor"));

  buffered_file bf(f);

  fd_ = -1;

  return bf;

}

long getpagesize() {

#  ifdef _WIN32

  SYSTEM_INFO si;

  GetSystemInfo(&si);

  return si.dwPageSize;

#  else

  long size = FMT_POSIX_CALL(sysconf(_SC_PAGESIZE));

  if (size < 0) FMT_THROW(system_error(errno, "cannot get memory page size"));

  return size;

#  endif

}

FMT_API void ostream::grow(size_t) {

  if (this->size() == this->capacity()) flush();

}

#endif  // FMT_USE_FCNTL

FMT_END_NAMESPACE