//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2021
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/Status.h"

#if TD_PORT_WINDOWS
#include "td/utils/port/wstring_convert.h"
#endif

#if TD_PORT_POSIX
#include "td/utils/port/thread_local.h"

#include <string.h>

#include <cstring>
#endif

namespace td {

#if TD_PORT_POSIX
CSlice strerror_safe(int code) {
  const size_t size = 1000;

  static TD_THREAD_LOCAL char *buf;
  init_thread_local<char[]>(buf, size);

#if !defined(__GLIBC__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE)
  strerror_r(code, buf, size);
  return CSlice(buf, buf + std::strlen(buf));
#else
  return CSlice(strerror_r(code, buf, size));
#endif
}
#endif

#if TD_PORT_WINDOWS
string winerror_to_string(int code) {
  const size_t size = 1000;
  wchar_t wbuf[size];
  auto res_size = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, code, 0, wbuf, size - 1, nullptr);
  if (res_size == 0) {
    return "Unknown Windows error";
  }
  while (res_size != 0 && (wbuf[res_size - 1] == '\n' || wbuf[res_size - 1] == '\r')) {
    res_size--;
  }
  auto error_message = from_wstring(wbuf, res_size);
  if (error_message.is_error()) {
    return "Invalid Windows error";
  }
  return error_message.move_as_ok();
}
#endif

}  // namespace td
