struct userInfo
{

    char* userName;
    char* password;

};

void signUp(const char* name, const char* password)
{

    userInfo* user = getNewUser(name, password);

    FILE* file = fopen("/home/john/userinfo", "wb");

    if (!file)

        fprintf(stderr, "Error! Could not read/write file!");

    else

        fwrite(user, sizeof(userInfo), 1, file);

    fclose(file);
}

bool validateLogin(const char* name, const char* password)
{

    FILE* file = fopen("/home/john/userinfo", "rb");

    if (!file)
    {
        fprintf(stderr, "Error! Could not read file.n");
        return false;
    }
    else
    {
        userInfo* user;

        while (fread(user, sizeof(userInfo), 1, file))
        {

            if ( (strcmp(name, user->userName) == 0) && (strcmp(password, user->password)== 0))
            {

                fclose(file);
                return true;
            }
        }
    }

    fclose(file);
    return false;

}

userInfo* getNewUser(const char* name, const char* password)
{

    userInfo* user = malloc(sizeof(userInfo));

    user->userName = strdup(name);
    user->password = strdup(password);

    return user;
}

int main()
{

    int choice = 0;
    bool quit = false;

    do
    {
        printf("Entern1. To login.n2. To sign up.nn");
        scanf("%1d", &choice);

        if (choice >= 1 && choice <= 2)
        {
            quit = true;

            if (choice == 1)
            {

                char userName[128];
                char password[128];

                flush();

                printf("nEnter username : ");
                fgets(userName, 128, stdin);


                printf("nEnter password : ");
                fgets(password, 128, stdin);

                bool isUser = validateLogin(userName, password);

                if (isUser)

                    printf("nnLogin successfull!");

                else
                    fprintf(stderr, "nError! Invalid username or password");

            }
            else if (choice == 2)
            {

                char userName[128];
                char password[128];

                flush();

                printf("nEnter your username : ");
                fgets(userName, 128, stdin);


                printf("Enter your password : ");
                fgets(password, 128, stdin);

                userName[strlen(userName)] = 0;
                password[strlen(password)] = 0;

                signUp(userName, password);


                printf("nnAccount created successfully!");

            }


        }
        else
        {
            fprintf(stderr, "nInvalid input! Try again.n");
        }

    }while (!quit);

    return 0;
}