Linked list with bytes

offset-list2.c

#include <stdio.h>
#include <stdlib.h>

struct element {
  unsigned char next;
  unsigned char value;
};

void print_list(void* memory, unsigned char list_id) {
  while (list_id != (unsigned char)-1) {
    struct element* list = memory + list_id * sizeof(struct element);
    printf("%d", list->value);
    list_id = list->next;
    if (list_id != (unsigned char)-1) {
      printf(", ");
    }
  }
  printf("\n");
}

unsigned char init_element(void* memory, unsigned char new_head_id, unsigned char list_id, unsigned char value) {
  struct element* new_head = memory + new_head_id * sizeof(struct element);
  new_head->next = list_id;
  new_head->value = value;
  return new_head_id;
}

int main(int argc, char** argv) {
  void* memory = malloc(10 * sizeof(struct element));
  unsigned char list_id = init_element(memory, 0, (unsigned char)-1, 34);
  list_id = init_element(memory, 1, list_id, 21);
  list_id = init_element(memory, 2, list_id, 13);
  list_id = init_element(memory, 3, list_id, 8);
  list_id = init_element(memory, 4, list_id, 5);
  list_id = init_element(memory, 5, list_id, 3);
  list_id = init_element(memory, 6, list_id, 2);
  list_id = init_element(memory, 7, list_id, 1);
  list_id = init_element(memory, 8, list_id, 1);
  print_list(memory, list_id);
  return 0;
}