Cde çalışan fonksiyon nasıl durdurulur

Arkadaşlar basit bir telefon defteri uygulaması yazıyorum. İki fonksiyonu tamamladım ancak küçük bir problemim var.


İkinci fonksiyonun sonunda görüldüğü gibi bir if-else deyimi var.
ve dosya içinden okuduğu verilerden eğer isim, soyisim ya da numara'dan herhangi birisi boş ise "dosyada hiç kayıt yok" diye kullanıcıya bir mesaj verip o fonksiyondan çıkmak istiyorum.
Ancak bunun için return; komutu işe yaramıyor ve program devam ederek else yapısının içine atlayarak ekranda anlamsız şeyler gösteriyor. Bu nasıl çözülebilir?

#include <stdio.h>
#include <stdlib.h>      // "stdlib" library contains of exit() function
#include <malloc.h>     // "malloc" library contains of malloc() function
#include <Windows.h>   // "Windows" library contains of Sleep() function which waits the system as you want
#include <io.h>       // "io" library contains of filelength() function

struct personKnowledge
{
	char name[32];
	char surname[32];
	char number[32];
};

FILE *ptrFILE, *ptrFILE1;
long int recordLength, totalRecordLength, location;
int number, totalRecordNumber;
static int counter = 0;

void newRecord();
void display();
void deletE();
void add();
void update();

int main()
{
	int choice;
	do
	{
		printf("\n\t\t --- Phone Book Program ---");
		printf("\n\n\t\t 1) New record");   // The options are being presented to user
		printf("\n\n\t\t 2) Display person knowledge");
		printf("\n\n\t\t 3) Delete someone");
		printf("\n\n\t\t 4) Add person to list");
		printf("\n\n\t\t 5) Update person knowledge");
		printf("\n\n\t\t 6) Exit");
		printf("\n\n\nEnter your choice: ");
		scanf("%d", &choice);
		switch (choice)
		{
		case 1:
		{
			newRecord();
			break;
		}
		case 2:
		{
			display();
			break;
		}
		case 3:
		{
			break;
		}
		case 4:
		{
			break;
		}
		case 5:
		{
			break;
		}
		case 6:
		{
			printf("\nWorking has been completed.\n");
			return 0;
		}
		default:
		{
			printf("\nWrong entry! The program has been terminated.\n");
			break;
		}
		}
	} while (choice >= 1 && choice <= 6);
	return 0;
}

void newRecord()
{
	if (counter > 0)
	{
		printf("You have already entered '1' and opened a file. To add a person please enter '4'\n");
		return;
	}
	else
	{
		if ((ptrFILE = fopen("Phone Book.dat", "wb")) == NULL)
		{
			printf("The file couldn't open\n");
			exit(0);
		}
		system("cls");   // Screen is being cleaned
		struct personKnowledge *p;   // p means person
		p = (struct personKnowledge *)malloc(sizeof(struct personKnowledge));   // Memory is being allocated
		fflush(stdin);
		recordLength = sizeof(*p);   // size of p
		printf("\n\Express person name: ");   // User is entering the person's knowledge and they are being saved in file
		gets(p->name);
		printf("Express %s's surname: ", p->name);
		gets(p->surname);
		printf("Express %s's number: ", p->name);
		gets(p->number);
		fwrite(&(*p), recordLength, 1, ptrFILE);
		printf("\nPlease wait, information is saving to file..\n");
		Sleep(750);
		printf("*-* Saving operation has been completed succesfully. *-*\n");
		free(p);
	}
	fclose(ptrFILE);
	counter++;
}

void display()
{
	if ((ptrFILE = fopen("Phone Book.dat", "rb")) == NULL)
	{
		printf("The file couldn't open\n");
		exit(0);
	}
	system("cls");   // Screen is being cleaned
	struct personKnowledge *s;   // s means searching
	s = (struct personKnowledge *)malloc(sizeof(struct personKnowledge));
	fflush(stdin);
	recordLength = sizeof(*s);
	totalRecordLength = filelength(fileno(ptrFILE));
	totalRecordNumber = totalRecordLength / recordLength;
	printf("\n\nExpress person record number which you search: ");
	scanf("%d", &number);
	location = (number - 1)*(recordLength);
	fseek(ptrFILE, location, SEEK_SET);
	fread(&(*s), recordLength, 1, ptrFILE);
	printf("\n*-* Person knowledge which you search *-*\n");
	Sleep(750);
	if (s->name == NULL || s->surname == NULL || s->number == NULL)
	{
		printf("There is no record like this.\n");
		return;
	}
	else
	{
		printf("Name: %s\n", s->name);
		printf("Surname: %s\n", s->surname);
		printf("Number: %s\n", s->number);
	}
	free(s);
	fclose(ptrFILE);
}

 

görüntüleme fonksiyonunu aşağıdaki şekilde güncellerseniz problem çözülür.
file oef kontrolü yapmanız gerekiyor.

saygılarımla,

void display()
{
	if ((ptrFILE = fopen("Phone Book.dat", "rb")) == NULL)
	{
		printf("The file couldn't open\n");
		exit(0);
	}
	system("cls");   // Screen is being cleaned
	struct personKnowledge *s;   // s means searching
	s = (struct personKnowledge *)malloc(sizeof(struct personKnowledge));
	fflush(stdin);
	recordLength = sizeof(*s);
	totalRecordLength = filelength(fileno(ptrFILE));
	totalRecordNumber = totalRecordLength / recordLength;
	printf("\n\nExpress person record number which you search: ");
	scanf("%d", &number);
	location = (number - 1)*(recordLength);
	fseek(ptrFILE, location, SEEK_SET);
	
	while (fread(&(*s), recordLength, 1, ptrFILE)==1)
	{
	
	printf("\n*-* Person knowledge which you search *-*\n");
	Sleep(750);
	if (s->name == NULL || s->surname == NULL || s->number == NULL)
	{
		printf("There is no record like this.\n");
		return;
	}
	else
	{
		printf("Name: %s\n", s->name);
		printf("Surname: %s\n", s->surname);
		printf("Number: %s\n", s->number);
	}
         break;
	}
	free(s);
	fclose(ptrFILE);
}