/* Calcite, src/kernel/utility.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 "heap.h"

int strequ(const char *str1, const char *str2) {
  while (1) {
    if (!*str1 && !*str2)
      return 1;
    if (*str1 != *str2)
      return 0;
    ++str1;
    ++str2;
  }
}

uint32_t end_swap_u32(uint32_t value) {
  return
    (value >> 24) |
    (((value >> 16) & 0xff) << 8) |
    (((value >> 8) & 0xff) << 16) |
    ((value & 0xff) << 24);
}

void double_buffer_zero(void **buffer, int *length, uint64_t bytes_per_entry) {
  void *new_buffer = heap_alloc(2 * *length * bytes_per_entry);
  memcpy(new_buffer, *buffer, *length * bytes_per_entry);
  heap_dealloc(*buffer, *length * bytes_per_entry);
  memzero(new_buffer + *length * bytes_per_entry, *length * bytes_per_entry);
  *buffer = new_buffer;
  *length *= 2;
}