CODEWITHSUNDEEP
ctermios
Kurt
Kurt

Reputation: 75

Can't disable escape echoing even with the echoing turned off

I'm trying to make a more-like application where the user's inputs are recorded but not printed. So I've turned off echoing, and turned off canonical mode to process inputs immediately.

Here's the code for this:

        struct termios oflags, nflags;
    tcgetattr(fileno(stdin), &oflags);
    nflags = oflags;
    nflags.c_lflag &= ~ECHO;
    nflags.c_lflag |= ECHONL;
    nflags.c_lflag &= ~(ICANON);
    nflags.c_cc[VKILL] = 0;  /* <Nada> */

    if (tcsetattr(fileno(stdin), TCSANOW, &nflags) != 0) {
        exit(0);
    }

And then to read the input and do stuff:

while(1){
    c = getchar();

And then I process C as control basically.

So that works for the most part. Except whenever I press enter, while the processing works as expected, the input still gets submitted / flushed. And I get the little square brackets around the last line.

Any help would be appreciated. Thanks!

SOLUTION: Removing 'nflags.c_lflag |= ECHONL;' fixes it, I'd added that for another reason.

Upvotes: 2

Views: 68

Answers (1)

Kurt
Kurt

Reputation: 75

Removing 'nflags.c_lflag |= ECHONL;' fixes it, I'd added that for another reason but I can get around using it too.

Upvotes: 1

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