/* Calcite, src/kernel/drives.c
 * Copyright 2025 Benji Dial
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <https://www.gnu.org/licenses/>.
 */

#include "utility.h"
#include "drives.h"
#include "heap.h"

struct drive_info *drive_list;
int drive_list_buffer_length = 0;
int drive_list_count = 0;

#define DRIVE_LIST_INITIAL_LENGTH 16

struct drive_info *add_drive() {

  if (drive_list_buffer_length == 0) {
    drive_list = heap_alloc(DRIVE_LIST_INITIAL_LENGTH * sizeof(struct drive_info));
    drive_list_buffer_length = DRIVE_LIST_INITIAL_LENGTH;
  }

  else if (drive_list_count == drive_list_buffer_length) {
    struct drive_info *new_drive_list =
      heap_alloc(2 * drive_list_buffer_length * sizeof(struct drive_info));
    memcpy(new_drive_list, drive_list, drive_list_count * sizeof(struct drive_info));
    heap_dealloc(drive_list, drive_list_count * sizeof(struct drive_info));
    drive_list = new_drive_list;
    drive_list_buffer_length *= 2;
  }

  struct drive_info *to_return = &drive_list[drive_list_count];
  ++drive_list_count;
  return to_return;

}