FMT_BEGIN_NAMESPACE Namespace Reference

Typedefs
typedef void(*	FormatFunc) (internal::buffer &, int, string_view)

Functions
int	safe_strerror (int error_code, char *&buffer, std::size_t buffer_size) FMT_NOEXCEPT
void	format_error_code (internal::buffer &out, int error_code, string_view message) FMT_NOEXCEPT
void	report_error (FormatFunc func, int error_code, string_view message) FMT_NOEXCEPT

Typedef Documentation

typedef void(* FMT_BEGIN_NAMESPACE::FormatFunc) (internal::buffer &, int, string_view)

Definition at line 88 of file format-inl.h.

Function Documentation

void FMT_BEGIN_NAMESPACE::format_error_code	(	internal::buffer &	out,
		int	error_code,
		string_view	message
	)

Definition at line 159 of file format-inl.h.

                                                         {
  // Report error code making sure that the output fits into
  // inline_buffer_size to avoid dynamic memory allocation and potential
  // bad_alloc.
  out.resize(0);
  static const char SEP[] = ": ";
  static const char ERROR_STR[] = "error ";
  // Subtract 2 to account for terminating null characters in SEP and ERROR_STR.
  std::size_t error_code_size = sizeof(SEP) + sizeof(ERROR_STR) - 2;
  typedef internal::int_traits<int>::main_type main_type;
  main_type abs_value = static_cast<main_type>(error_code);
  if (internal::is_negative(error_code)) {
    abs_value = 0 - abs_value;
    ++error_code_size;
  }
  error_code_size += internal::to_unsigned(internal::count_digits(abs_value));
  writer w(out);
  if (message.size() <= inline_buffer_size - error_code_size) {
    w.write(message);
    w.write(SEP);
  }
  w.write(ERROR_STR);
  w.write(error_code);
  assert(out.size() <= inline_buffer_size);
}

void FMT_BEGIN_NAMESPACE::report_error	(	FormatFunc	func,
		int	error_code,
		string_view	message
	)

Definition at line 186 of file format-inl.h.

                                                    {
  memory_buffer full_message;
  func(full_message, error_code, message);
  // Use Writer::data instead of Writer::c_str to avoid potential memory
  // allocation.
  std::fwrite(full_message.data(), full_message.size(), 1, stderr);
  std::fputc('\n', stderr);
}

int FMT_BEGIN_NAMESPACE::safe_strerror	(	int	error_code,
		char *&	buffer,
		std::size_t	buffer_size
	)

Definition at line 99 of file format-inl.h.

                                                                       {
  FMT_ASSERT(buffer != FMT_NULL && buffer_size != 0, "invalid buffer");

  class dispatcher {
   private:
    int error_code_;
    char *&buffer_;
    std::size_t buffer_size_;

    // A noop assignment operator to avoid bogus warnings.
    void operator=(const dispatcher &) {}

    // Handle the result of XSI-compliant version of strerror_r.
    int handle(int result) {
      // glibc versions before 2.13 return result in errno.
      return result == -1 ? errno : result;
    }

    // Handle the result of GNU-specific version of strerror_r.
    int handle(char *message) {
      // If the buffer is full then the message is probably truncated.
      if (message == buffer_ && strlen(buffer_) == buffer_size_ - 1)
        return ERANGE;
      buffer_ = message;
      return 0;
    }

    // Handle the case when strerror_r is not available.
    int handle(internal::null<>) {
      return fallback(strerror_s(buffer_, buffer_size_, error_code_));
    }

    // Fallback to strerror_s when strerror_r is not available.
    int fallback(int result) {
      // If the buffer is full then the message is probably truncated.
      return result == 0 && strlen(buffer_) == buffer_size_ - 1 ?
            ERANGE : result;
    }

#if !FMT_MSC_VER
    // Fallback to strerror if strerror_r and strerror_s are not available.
    int fallback(internal::null<>) {
      errno = 0;
      buffer_ = strerror(error_code_);
      return errno;
    }
#endif

   public:
    dispatcher(int err_code, char *&buf, std::size_t buf_size)
      : error_code_(err_code), buffer_(buf), buffer_size_(buf_size) {}

    int run() {
      return handle(strerror_r(error_code_, buffer_, buffer_size_));
    }
  };
  return dispatcher(error_code, buffer, buffer_size).run();
}