#include<sys/mman.h>
#include<stdio.h>
#include<fcntl.h>
#include<unistd.h>
#include<string.h>

struct dessert {
	char name[16];
	int calories;
	int rating;
};

int main(){
	int fd = open("desserts.dst", O_RDWR | O_CREAT | O_TRUNC, 0644);
	lseek(fd, 1024, SEEK_SET);
	write(fd, " ", 1);
	void *file_region = mmap(0, 1024, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);

	
	struct dessert d = {"Cupcake", 150, 3};
	memcpy(file_region, &d, sizeof(d));

	// More direct
	struct dessert *dessert_list = file_region;
	for(int i = 1; i < 4; i++){
		printf("Enter the name:  ");
		scanf("%s", &(dessert_list[i].name) );
		printf("Enter the number of calories:  ");
		scanf("%d", &(dessert_list[i].calories));
		printf("Enter a rating:  ");
		scanf("%d", &(dessert_list[i].rating));
	}

	munmap(file_region, 1024);
	close(fd);
	return 0;
}