#define _POSIX_SOURCE 1
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <signal.h>
#include <sys/types.h>

#define len 8

struct termios old, new;

void sig_handle (int signo)
{
    tcsetattr(STDIN_FILENO,TCSANOW,&old);
    fprintf(stderr, "Abbruch durch Signal : %d\n", signo);
    exit (0);
}

int setRawMode ()
{
    signal (SIGINT, sig_handle);
    signal (SIGQUIT, sig_handle);

    if(tcgetattr(STDIN_FILENO, &old) != 0)
    {
        return -1;
    }
    new=old;
    new.c_lflag &= ~ICANON;
    new.c_lflag &= ~ECHO;
    new.c_cc[VMIN] = 1;
    new.c_cc[VTIME] = 0;

    return (tcsetattr(STDIN_FILENO, TCSANOW, &new));


}

int restoreNormalMode()
{
    return (tcsetattr(STDIN_FILENO, TCSANOW, &old));
}



int getpasswd(char *s, int n)
{
    if(setRawMode() != 0)
    {
        printf("\n\nRawMode konnte nicht gesetzt werden!\n\n");
        return EXIT_FAILURE;
    }

    printf("Passwort: ");

    int i = 0,a;

    do
    {
       a=getchar();
       if(33<=a && a!=127) //127 Backspace, drueber Laenderspeziefisch
       {
            s[i] = a;
            printf("*");
            i++;
       }

       if(a == '\n' || i >= n)
       {
           break;
       }

    }
    while(1);



    restoreNormalMode();

    return i;

}


int main(int argc, char *argv[])
{

    char *s = malloc((len + 1) * sizeof(char));
    int i,n = len;
    i = getpasswd(s, n);

    printf("\n\nPasswort: %s", s );
    printf("\nPasswortlaenge: %d\n\n", i );

 return 0;
}