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

#define INITIAL_SIZE 3

int main()
{
    FILE *fp;
    int size = INITIAL_SIZE;
    int length,i, count =0;
    char **brand=NULL;
    char **model=NULL;
    int *year=NULL;

    brand = (char**)malloc(size*sizeof(char*));
    model = (char**) malloc(size*sizeof(char*));
    year = (int*) malloc(size*sizeof(int));

    for(i=0;i<size;i++)
    {
        brand[i] = (char*) malloc(40);
        model[i] = (char*) malloc(40);
    }

    if((fp=fopen("cars.bin", "rb")) == NULL)
    {
        printf("couldnt open file");
        exit(1);
    }

    while(1)
    {
        if(fread(&length, sizeof(int), 1, fp) != 1)
        {
            printf("1st length read end\n");
            break;
        }

        if(fread(brand[count], 1, length, fp) != length)
        {
            printf("brand read end\n");
            break;
        }
        if(fread(&length, sizeof(int), 1, fp) != 1)
        {
            printf("2nd length read end\n");
            break;
        }
        if(fread(model[count], 1, length, fp) != length)
        {
            printf("model read end\n");
            break;
        }
        if(fread(&year[count], sizeof(int),1, fp) != 1)
        {
            printf("year read end\n");
            break;
        }
        count++;

        if(count==size)
        {
            brand = realloc(brand, size*2*sizeof(char*));
            model = realloc(model, size*2*sizeof(char*));
            year = realloc(year, size*2*sizeof(int));
            if(model == NULL)
            {
                printf("model reallocate error\n");
                break;
            }
            if(brand == NULL)
            {
                printf("brand reallocate error\n");
                break;
            }
            if(year == NULL)
            {
                printf("year reallocate error\n");
                break;
            }

            for(i=size;i<2*size;i++)
            {
                brand[i] = (char*) malloc(40);
                 model[i] = (char*) malloc(40);
            }
             size*=2;

        }

    }

    fclose(fp);


    for(i=0;i<count;i++)
    {
        printf("%s\n", brand[i]);
        printf("%s\n", model[i]);
        printf("%d\n", year[i]);
    }


    for(i=0;i<size;i++)
    {
       free(brand[i])   ;
       free(model[i]);
    }

    free(brand);
    free(model);
    free(year);
    return 0;
}