C program to click the mouse n times in X11

build.sh

#!/bin/bash
gcc -o click click.c -lX11 -lXtst -O2 -flto -march=native -mtune=native -DDELAY_SECONDS=0 -DDELAY_NSECONDS=35000000

click.c

#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <time.h>
#include <X11/Xlib.h>
#include <X11/extensions/XTest.h>

#ifndef DELAY_SECONDS
#define DELAY_SECONDS 0
#endif

#ifndef DELAY_NSECONDS
#define DELAY_NSECONDS 25000000;
#endif

int main(int argc, char ** argv) {
    if (argc != 2) {
        puts("Invalid arguments!");
        return 1;
    }

    long signed_clicks = atol(argv[1]);
    if (signed_clicks < 1) {
        puts("Invalid number of clicks!");
        return 1;
    }

    // 1st argument is number of clicks to perform
    unsigned long clicks = strtoul(argv[1], NULL, 10);

    // get X display
    Display *display = XOpenDisplay(NULL);

    // timespec struct to hold the time to sleep
    // between clicks
    struct timespec sleeptime;

    // time between clicks in seconds...
    sleeptime.tv_sec = DELAY_SECONDS;

    // ... and nanoseconds.
    sleeptime.tv_nsec = DELAY_NSECONDS;

    // click loop
    for (unsigned long i = 0; i < clicks; i++) {
        // click left mouse
        XTestFakeButtonEvent(display, 1, true, 0);
        XFlush(display);

        // release left mouse
        XTestFakeButtonEvent(display, 1, false, 0);
        XFlush(display);

        // sleep; super-fast clicking is usually not desirable
        nanosleep(&sleeptime, NULL);

        unsigned long ratio = 100 * i / clicks;

        // print a progress star for every 5 percent done
        printf("\r[%.*s", (ratio / 5), "********************");

        // print a space for every 5% missing
        printf("%.*s] ", (20 - ratio / 5), "                    ");

        // print percentage of total clicks
        printf("%3d%% ", ratio);

        // flush stdout so progress is actually shown in real time
        fflush(stdout);
    }

    // hard-coded 100%
    printf("\r[********************] 100%%!\n");

    // close the display
    XCloseDisplay(display);
    return 0;
}