__sprintf.h

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#pragma once
#if !defined(__XTD_CORE_INTERNAL__)
#error "Do not include this file: Internal use only"
#endif
 
#include "../types.h"
#include <cstdarg>
#include <string>
 
template <typename char_t>
inline std::basic_string<char_t> __sprintf(const char_t* fmt, ...) {return std::basic_string<char_t>();}
 
template <>
inline std::basic_string<char> __sprintf<char>(const char* fmt, ...) {
  va_list args;
  va_start(args, fmt);
  std::basic_string<char> formatted_string(vsnprintf(nullptr, 0, fmt, args), 0);
  va_end(args);
  va_start(args, fmt);
  vsnprintf(&formatted_string[0], formatted_string.size() + 1, fmt, args);
  va_end(args);
  if (formatted_string == "INF") formatted_string = {'i', 'n', 'f'};
  if (formatted_string == "-INF") formatted_string = {'-', 'i', 'n', 'f'};
  if (formatted_string == "NAN") formatted_string = {'n', 'a', 'n'};
  return formatted_string;
}
 
template <>
inline std::basic_string<xtd::wchar> __sprintf<xtd::wchar>(const xtd::wchar* fmt, ...) {
  va_list args;
  size_t size = 1024;
  int length = 0;
  std::basic_string<xtd::wchar> formatted_string;
  bool error = false;
  do {
    formatted_string = std::basic_string<xtd::wchar>(size, 0);
    va_start(args, fmt);
    length = vswprintf(&formatted_string[0], formatted_string.size() + 1, fmt, args);
    error = length < 0;
    va_end(args);
    size *= 2;
  } while (error);
  formatted_string.resize(length);
  if (formatted_string == L"INF") formatted_string = {'i', 'n', 'f'};
  if (formatted_string == L"-INF") formatted_string = {'-', 'i', 'n', 'f'};
  if (formatted_string == L"NAN") formatted_string = {'n', 'a', 'n'};
  return formatted_string;
}