#include<iostream>
#include<fstream>
#include<string.h>
#include<unistd.h>
#include<termios.h>
using namespace std;
int getch() {
    struct termios oldt, newt;
    int ch;
    tcgetattr(STDIN_FILENO, &oldt);
    newt = oldt;
    newt.c_lflag &= ~(ICANON | ECHO);
    tcsetattr(STDIN_FILENO, TCSANOW, &newt);
    ch = getchar();
    tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
    return ch;
}
class user{
    char uid[8];
    char pwd[8];
    int level;
public:
    void initUser(){
        cin.ignore();
        cout<<"username(7ch max): ";
        cin.getline(uid, 7);
        cout<<"password(7ch max): ";
        cin.getline(pwd, 7);
        level = 0;
    }
    int authenticate(char *u, char *p){
        if((!strcmp(u, uid)) && (!strcmp(p, pwd)))
            return 1;
        else if(!strcmp(u, uid))
            return 0;
        else
            return -1;
    }
    void _debug(){
        cout<<uid<<"|"<<pwd<<"|"<<level;
    }
    char* getData(int f){
        if(f)
            return uid;
        return pwd;
    }
}CURRENT;
void addUser(){
    user newUser;
    newUser.initUser();
    fstream userdb;
    userdb.open("users.ctc", ios::binary|ios::out|ios::app);
    userdb.write((char*)&newUser, sizeof(newUser));
    userdb.close();
}
void authUser(){
    char u[8],p[8],x;
    int i=0;
    cout<<"===========================\n";
    cout<<"|USERNAME : ";cin.getline(u, 7);
    cout<<"|PASSWORD : ";do{x=getch();p[i++]=x;if(x=='\n')break;cout<<"*";}while(i<8);
    cout<<"\n===========================";
    user t;
    fstream userdb;
    userdb.open("users.ctc", ios::binary|ios::in);
    while(!t.eof()){
        userdb.read((char*)&t, sizeof(t));
        if(!t.authenticate(u, p)
    userdb.close();
}
int main(){
    authUser();
}