#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <sys/stat.h>
#include <stdint.h>
#include <string.h>

struct Item
{
  int value;
  uint32_t next_pointer;
};

void find_items_layout(char* ptr) {
    struct Item *item = (struct Item*)ptr;
    printf("%d ", item->value);

    while (item->next_pointer != 0) {
        item = (struct Item*)(item->next_pointer + ptr);
        printf("%d ", item->value);
    }
}

int main(int argc, char* argv[]) {
    char *fname = argv[1];
    int fd = open(fname, O_RDONLY);

    if (fd == -1) {
        perror("failed to open file");
        return 2;
    }

    FILE * fp = fdopen(fd, "r");
    fseek(fp, 0, SEEK_END);
    int length = ftell(fp);

    char *ptr = mmap(NULL, length, PROT_READ, MAP_SHARED, fd, 0);
    if ((int64_t)ptr == -1) {
        perror("mmap failed");
        return 3;
    }

    find_items_layout(ptr);

    munmap(ptr, length);
    close(fd);
    return 0;
}