clicker.c

// clicker.c
// Count the times each key has been pressed
#include <stdio.h>
#include <unistd.h>
#include <termios.h>

// Yeah, I'm lazy, get over it
#define roe(_expr)  if((ret = (_expr)) < 0) return ret

// Make sure we read stdin one key at the time
// https://stackoverflow.com/questions/421860/capture-characters-from-standard-input-without-waiting-for-enter-to-be-pressed
static int
getch()
{
    int ret = 0;
    char buf = 0;
    struct termios t = {0};
 
    roe(tcgetattr(0, &t));

    t.c_lflag       &= ~ICANON;
    t.c_lflag       &= ~ECHO;
    t.c_cc[VMIN]    = 1;
    t.c_cc[VTIME]   = 0;

    roe(tcsetattr(0, TCSANOW, &t));
    roe(read(0, &buf, 1));

    t.c_lflag |= ICANON;
    t.c_lflag |= ECHO;
    roe(tcsetattr(0, TCSADRAIN, &t));

    return buf;
}

int
main()
{
    int ret = 0;
    unsigned long int counters[128] = {0};

    while(1)
    {
        roe(getch());
        switch(ret)
        {
        // If I pressed ESC...
        case 27:
            return 0;
        
        // Everything else
        default:
            printf("%c: %ld\n", ret, ++counters[ret > 127 ? 127 : ret]);
            break;
        }
    }
    return 0;
}