Using getchar to immediately retrieve keystrokes

Question

I'm trying to use getchar() to retrieve 1 keystroke at a time from the keyboard. Though it does this, the problem I'm having is doesn't send it immediately, it waits for the enter key to be pressed and then it reads 1 char at a time from the buffer.

int main(){
    char c = getchar();
    putchar(c);

return 0;
}

How do I immediately read each keystroke as it's pressed from the keyboard? Thanks

Answer 1

You have to pass in raw mode. I paste you code from:

http://c.developpez.com/faq/?page=clavier_ecran

#include <termios.h>
#include <unistd.h>

void mode_raw(int activer)
{
static struct termios cooked;
static int raw_actif = 0;

if (raw_actif == activer)
    return;

if (activer)
{
    struct termios raw;

    tcgetattr(STDIN_FILENO, &cooked);

    raw = cooked;
    cfmakeraw(&raw);
    tcsetattr(STDIN_FILENO, TCSANOW, &raw);
}
else
    tcsetattr(STDIN_FILENO, TCSANOW, &cooked);

raw_actif = activer;

}

After that, you don't need to tap Enter key.

EDIT: Like Emmet says, it's the Unix version, it's depend of the environment.