Password
Hi :)
I have finally figured out how to make *password input. But, it's kinda working weird :/
If I do it like this:
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#include <termios.h>
#include <unistd.h>
#include <stdio.h>
#include <iostream>
#include <string>
using namespace std;
int getch() {
int ch;
struct termios t_old, t_new;
tcgetattr(STDIN_FILENO, &t_old);
t_new = t_old;
t_new.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &t_new);
ch = getchar();
tcsetattr(STDIN_FILENO, TCSANOW, &t_old);
return ch;
}
string getpass(const char *prompt, bool show_asterisk=true)
{
const char BACKSPACE=127;
const char RETURN=10;
string password;
unsigned char ch=0;
cout <<prompt<<endl;
while((ch=getch())!=RETURN)
{
if(ch==BACKSPACE)
{
if(password.length()!=0)
{
if(show_asterisk)
cout <<"\b \b";
password.resize(password.length()-1);
}
}
else
{
password+=ch;
if(show_asterisk)
cout <<'*';
}
}
cout <<endl;
return password;
}
int main()
{
string pass=getpass("Password: ",true);
}
return 0;
}
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It's working nice. BUT as I put it into a cycle, so I can check for right password, it's NOT waiting for me to enter the password:
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#include <termios.h>
#include <unistd.h>
#include <stdio.h>
#include <iostream>
#include <string>
using namespace std;
int getch() {
int ch;
struct termios t_old, t_new;
tcgetattr(STDIN_FILENO, &t_old);
t_new = t_old;
t_new.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &t_new);
ch = getchar();
tcsetattr(STDIN_FILENO, TCSANOW, &t_old);
return ch;
}
string getpass(const char *prompt, bool show_asterisk=true)
{
const char BACKSPACE=127;
const char RETURN=10;
string password;
unsigned char ch=0;
cout <<prompt<<endl;
while((ch=getch())!=RETURN)
{
if(ch==BACKSPACE)
{
if(password.length()!=0)
{
if(show_asterisk)
cout <<"\b \b";
password.resize(password.length()-1);
}
}
else
{
password+=ch;
if(show_asterisk)
cout <<'*';
}
}
cout <<endl;
return password;
}
int main()
{
string login;
int i=0;
while (i==0){
cout << "Login: ";
cin >> login;
string pass=getpass("Password: ",true);
//check user...
cout << "Logged in as "<<login<<"\n";
}
return 0;
}
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and the output is like:
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Login: john
Password:
Logged in as john
Login:
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No, the problem isn't cycle, it's the key "RETURN" that I enter after "login". So? How to avoid that?
Don't mix getch and company with cin. They don't work well together.
I've just figured it :)
cin.ignore(2048, '\n'); after Login and it works flawless^^
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