Solved

libc function?

Posted on 2002-05-25
2
305 Views
Last Modified: 2010-04-21
Hi everyone, i'm writing an application and at some point the program asks the user for a password. Now, i'd like to do this the same way that, say, GPG does: i type the password but the text doesn't show in the screen.

also i don't want (if possible) to use ncurses.

someone told me that there is a function for unechoed input in libc, any ideas?

thanks, any help will be really appreciated

uri
0
Comment
Question by:urif
2 Comments
 
LVL 1

Accepted Solution

by:
websolution earned 150 total points
ID: 7035059
I look for a "unechoed" and I couldn't find it neither in Posix nor Linux

using posix commands only:

#include <stdlib.h>
#include <stdio.h>

#include <termios.h>
#include <string.h>

static struct termios stored;

void echo_off(void)
{
    struct termios new;
    tcgetattr(0,&stored);
    memcpy(&new, &stored, sizeof(struct termios));
    new.c_lflag &= (~ECHO);
    tcsetattr(0,TCSANOW,&new);
    return;
}

void echo_on(void)
{
    tcsetattr(0,TCSANOW,&stored);
    return;
}

int main(int argc, char **argv)
{
    char passwd[256], login[256];
    printf("Enter your login: ");
    gets(login);
    printf("Enter your password: ");
    echo_off();
    gets(passwd);
    echo_on();
    printf("you entered: \n\tlogin: %s\n\tpassword: %s\n", login, passwd);
}

to compile it:  cc prog.c -o prog


using curses or ncurses
#include <curses.h>

main()
{
        char passwd[256], login[256];

        initscr();
        cbreak();
        echo();

        printw("enter your login: ");
        getstr(login);

        noecho();
        printw("enter your password: ");
        getstr(passwd);

        printw("you entered: \n\tlogin: %s\n\tpassword: %s\n", login, passwd);

        printw("Press a key to quit");
        getch();
        endwin();
}
to compile it:
cc -lcurses prog.c -o prog
or
cc -lncurses prog.c -o prog
0
 

Author Comment

by:urif
ID: 7035060
thx!
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
How do I delete this file in Linux 2 457
Problem to telnet 23 165
what does "puppet agent -t" do ? 2 263
Help with Ubuntu 14.04 LTS 10 137
Have you ever been frustrated by having to click seven times in order to retrieve a small bit of information from the web, always the same seven clicks, scrolling down and down until you reach your target? When you know the benefits of the command l…
The purpose of this article is to fix the unknown display problem in Linux Mint operating system. After installing the OS if you see Display monitor is not recognized then we can install "MESA" utilities to fix this problem or we can install additio…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question