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libc function?

Posted on 2002-05-25
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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
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Question by:urif
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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
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Author Comment

by:urif
ID: 7035060
thx!
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