dsdasdas

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

struct person
{
    char name[30];
    int age;
};

int hasonlit (const void *p1, const void*p2)
{
struct person pers_1 = *(const struct person *)p1;
struct person pers_2 = *(const struct person *)p2;
if (pers_1.age > pers_2.age)
    return -1;
if (pers_1.age < pers_2.age)
    return 1;

if (pers_1.age == pers_2.age)
    return strcmp(pers_1.name, pers_2.name);
}

struct person *foo(char *fajlnev, int kor)
{


FILE *f = fopen (fajlnev, "rb");
struct person pers;
struct person *tomb;
int db=0;

while (fread(&pers, sizeof(pers),1,f) == 1)
if ( pers.age <= kor )
    ++db;

tomb = malloc (db*sizeof(pers)+1);
rewind(f);
db=0;

while (fread(&pers, sizeof(pers),1,f) == 1)
if ( pers.age <= kor )
    tomb[db++] = pers;

qsort (tomb,db, sizeof(pers), hasonlit);
memset(tomb[db+1].name, 0, 30);

return tomb;
}