#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//  size_of_name(int)|name(str)|group(int)|size_of_faknum|fak_num(str)

void readFile(int *num_of_records, char ***name, int **group, char ***fak_num, FILE *fp){
    int size;
    int allocated_elements = 5;
    int counter=0;

    *name = (char**)malloc(sizeof(int)*allocated_elements);
    *group = (int*)malloc(sizeof(int)*allocated_elements);
    *fak_num = (char**)malloc(sizeof(int)*allocated_elements);

    while(1){
        if(counter>=allocated_elements){
            allocated_elements*=2;

            *name = (char**)realloc(*name, sizeof(int)*allocated_elements);
            *group = (int*)realloc(*group, sizeof(int)*allocated_elements);
            *fak_num = (char**)realloc(*fak_num, sizeof(int)*allocated_elements);
        }

        if(fread(&size, sizeof(int), 1, fp)<=0){
            break;
        }
        name[0][counter] = (char*)malloc(size+1);
        if(fread(name[0][counter], sizeof(char), size, fp)<=0){
            break;
        }
        name[0][counter][size]='\0';


        if(fread(&group[0][counter], sizeof(int), 1, fp)<=0){
            break;
        }

        if(fread(&size, sizeof(int), 1, fp)<=0){
            break;
        }
        fak_num[0][counter] = malloc(size+1);
        printf("%d %d\n\n", counter, size);
        if(fread(fak_num[0][counter], sizeof(char), size, fp)<=0){
            break;
        }
        fak_num[0][counter][size]='\0';

        counter++;
    }
}

void writeFile(FILE *fp){
    int i=5;
    char name[5] = "dadad";
    int group = 50;
    int j=6;
    char fak_num[6] = "123456";

    fwrite(&i, sizeof(int), 1, fp);
    fwrite(name, sizeof(char), 5, fp);
    fwrite(&group, sizeof(int), 1, fp);
    fwrite(&j, sizeof(int), 1, fp);
    fwrite(fak_num, sizeof(char), 6, fp);
}

int main(){
    int num_of_records;
    char **name;
    int *group;
    char **fak_num;

    FILE *fp;
    fp = fopen("file.bin", "rb");
    readFile(&num_of_records, &name, &group, &fak_num, fp);
    //fp = fopen("file.bin", "wb");
    //writeFile(fp);
    //writeFile(fp);
    //writeFile(fp);writeFile(fp);
    int i;
    for(i=0; i<4; i++){
        printf("%s %d %s\n", name[i], group[i], fak_num[i]);
    }

    return 0;
}