int __cdecl fseek(FILE *File, __int32 Offset, int Origin)
{
  char v3; // ST14_1@2
  int result; // eax@8

  if ( !File )
  {
    if ( _CrtDbgReport(2, (int)"fseek.c", 146, 0, "str != NULL", v3) == 1 )
      __asm { int     3               ; Trap to Debugger }
  }
  if ( File->_flag & 0x83 && (!Origin || Origin == 1 || Origin == 2) )
  {
    File->_flag &= 0xFFFFFFEFu;
    if ( Origin == 1 )
    {
      Offset += ftell(File);
      Origin = 0;
    }
    _flush(File);
    if ( File->_flag & 0x80 )
    {
      File->_flag &= 0xFFFFFFFCu;
    }
    else
    {
      if ( File->_flag & 1 )
      {
        if ( File->_flag & 8 )
        {
          if ( !(File->_flag & 0x400) )
            File->_bufsiz = 512;
        }
      }
    }
    result = (_lseek(File->_file, Offset, Origin) != -1) - 1;
  }
  else
  {
    dword_4DA378 = 22;
    result = -1;
  }
  return result;
}