[C언어]파일 입출력 - 사용자 추가, 수정, 검색, 출력하기

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
typedef struct person {
    char name[100];
    char address[200];
    char mobilePhone[40];
    char desc[200];
    struct person* link;
}Person;
 
void init_record(Person* p) {
    sprintf(p->name, "null");
    sprintf(p->address, "null");
    sprintf(p->mobilePhone, "null");
    sprintf(p->desc, "null");
    p->link = NULL;
}
 
void loadFile(FILE* fp,Person* hp) {
    Person* temp;
    Person* last;
    temp = (Person*)malloc(sizeof(Person));
    fread(temp, sizeof(Person), 1, fp);
    if (feof(fp) == 0){
        printf("---------------------------------\n");
        printf("Name : %s", temp->name);
        printf("Address : %s", temp->address);
        printf("Mobile Phone : %s", temp->mobilePhone);
        printf("Description : %s", temp->desc);
        hp->link = temp;
        last = temp;
    }
    else free(temp);
 
    temp = (Person*)malloc(sizeof(Person));
    fread(temp, sizeof(Person), 1, fp);
    if (feof(fp) == 0) {
        printf("---------------------------------\n");
        printf("Name : %s", temp->name);
        printf("Address : %s", temp->address);
        printf("Mobile Phone : %s", temp->mobilePhone);
        printf("Description : %s", temp->desc);
        last->link = temp;
        last = temp;
    }
    else free(temp);
 
    while (1){
        temp = (Person*)malloc(sizeof(Person));
        fread(temp, sizeof(Person), 1, fp);
        if (feof(fp) == 0) {
            printf("--------------------------------\n");
            printf("Name : %s", temp->name);
            printf("Address : %s", temp->address);
            printf("Mobile Phone : %s", temp->mobilePhone);
            printf("Description : %s", temp->desc);
            last->link = temp;
            last = temp;
        }
        else {
            free(temp);
            break;
        }
    }
    printf("--------------------------------\n");
}
 
void add_record(FILE* fp, Person* hp) {
    fp = fopen("info.dat", "a+b");
    if (fp == NULL) {
        printf("open error\n");
        return;
    }
 
    Person* instPerson = (Person*)malloc(sizeof(Person));
    init_record(instPerson);
    Person* temp = hp;
    while (temp->link != NULL) {
        temp = temp->link;
    }
    getchar();
    printf("input name:");
    fgets(instPerson->name, sizeof(instPerson->name), stdin);
    printf("input address:");
    fgets(instPerson->address, sizeof(instPerson->address), stdin);
    printf("input mobilePhone:");
    fgets(instPerson->mobilePhone, sizeof(instPerson->mobilePhone), stdin);
    printf("input desc:");
    fgets(instPerson->desc, sizeof(instPerson->desc), stdin);
 
    temp->link = instPerson;
 
    fwrite(instPerson, sizeof(Person), 1, fp);
 
    fclose(fp);
}
 
void search_record(Person* hp) {
    char name[100];
    printf("input name : ");
    getchar();
    fgets(name, sizeof(name), stdin);
    //name[strlen(name) - 1] = '\0';
    Person* temp = hp->link;
    while (temp != NULL) {
        if (strcmp(temp->name, name) == 0) {
            printf("---------------------------------\n");
            printf("Name : %s", temp->name);
            printf("Address : %s", temp->address);
            printf("Mobile Phone : %s", temp->mobilePhone);
            printf("Description : %s", temp->desc);
            printf("---------------------------------\n");
            break;
        }
        temp = temp->link;
    }
}
 
void update_record(Person* hp) {
    char name[100];
    printf("input name : ");
    getchar();
    fgets(name, sizeof(name), stdin);
    Person* temp = hp->link;
    FILE* fpw = fopen("info_temp.dat", "wb");
    if (fpw == NULL) {
        printf("open error\n");
        return;
    }
    while (temp != NULL) {
        if (strcmp(temp->name, name) == 0) {
            printf("input address:");
            fgets(temp->address, sizeof(temp->address), stdin);
            printf("input mobilePhone:");
            fgets(temp->mobilePhone, sizeof(temp->mobilePhone), stdin);
            printf("input desc:");
            fgets(temp->desc, sizeof(temp->desc), stdin);
        }
        fwrite(temp, sizeof(Person), 1, fpw);
        temp = temp->link;
    }
    fclose(fpw);
    remove("info.dat");
    rename("info_temp.dat", "info.dat");
}
 
void printAll(Person* hp) {
    Person* temp = hp->link;
    while (temp != NULL) {
        printf("---------------------------------\n");
        printf("Name : %s", temp->name);
        printf("Address : %s", temp->address);
        printf("Mobile Phone : %s", temp->mobilePhone);
        printf("Description : %s", temp->desc);
        temp = temp->link;
    }
    printf("---------------------------------\n");
}
 
void main() {
    int num = 0;
 
    Person* hp = (Person*)malloc(sizeof(Person));
    init_record(hp);
 
    FILE* fp;
    fp = fopen("info.dat", "rb");
    if (fp != NULL) {
        loadFile(fp, hp);
        fclose(fp);
    }
 
    while (true) {
        printf("------------------------------\n");
        printf("1. Add\n");
        printf("2. Modify\n");
        printf("3. Search\n");
        printf("4. Delete\n");
        printf("5. Print All The Members\n");
        printf("6. Quit\n");
        printf("------------------------------\n");
 
        scanf("%d", &num);
        if (num == 6)
            break;
        
        switch (num) {
        case 1:
            add_record(fp, hp);
            break;
        case 2:
            update_record(hp);
            break;
        case 3:
            search_record(hp);
            break;
        case 4:
            break;
        case 5:
            printAll(hp);
            break;
        default:
            break;
        }
 
    }
    
 
    {
        Person* temp = hp;
        Person* temp2;
        while(temp!=NULL)
        {
            temp2 = temp->link;
            free(temp);
            temp = temp2;
        } 
    }
}

C언어 파일입출력 및 연결리스트를 활용한 사용자 관리 프로그램 입니다.