SD Card Core IP with Nios II - SD Card Detect Issue

Or better yet, can someone explain what this code is saying...? This is the C code in the HAL src folder

bool alt_up_sd_card_is_Present(void)

// Check if there is an SD Card insterted into the SD Card socket.

{

bool result = false;

if ((device_pointer != NULL) && ((IORD_16DIRECT(aux_status_register,0) & 0x02) != 0))

{

result = true;

}

else if (initialized == true)

{

int index;

initialized = false;

search_data.valid = false;

is_sd_card_formated_as_FAT16 = false;

for(index = 0; index < MAX_FILES_OPENED; index++)

{

active_files[index].in_use = false;

active_files[index].modified = false;

}

}

return result;

}

Thanks!