dadas

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

struct person
{
    char name[25];
    int year, month, day;
};

int hasonlit (const void *p1, const void*p2)
{
struct person f1 = *(const struct person *)p1;
struct person f2 = *(const struct person *)p2;
    if (f1.month > f2.month)
    {
        return -1;
    }
    if (f1.month < f2.month)
    {
        return 1;
    }
    if (f1.month == f2.month)
    {
        if (f1.day > f2.day)
        {
            return -1;
        }
        if (f1.day < f2.day)
        {
            return 1;
        }
        if (f1.day == f2.day)
        {
            return strcmp(f1.name,f2.name);
        }
    }
    return 0;
}

struct person *foo(char *fajlnev, int evszam)
{
    FILE *f = fopen(fajlnev, "rb");
    struct person pers;
    struct person *tomb;
    int db = 0;
    while (fread(&pers, sizeof(pers),1,f) == 1)
    {
        if (pers.year == evszam)
        {
            db++;
        }
    }
    tomb = malloc( db * sizeof(pers) + 1);

    db = 0;
    rewind(f);
    while (fread(&pers, sizeof(pers),1,f) == 1)
    {
        if (pers.year == evszam)
        {
            tomb[db++] = pers;
        }
    }
    qsort (tomb,db, sizeof(pers), hasonlit);
    tomb[db+1].year = -1000;
    return tomb;
}