Pixelflut client Scaffold in C using libim2

pixelflut-client-scaffold.c

/*
 * PixelFlut client scaffold using Imlib2
 * Install:
 *  debian/ubuntu: apt install libimlib2
 *  arch: pacman -S imlib2
 *  fedora: dnf install imlib2
 * Compile: `gcc -o pc file.c -Wall -Wextra -lImlib2`
 * Usage: ./pc <hostip> <port> <file_path> <x> <y> <repeat>
 *        hostip: IP address of the server
 *        port: port of the server (should be 1337)
 *        file_path: path to the image file
 *        x, y: coordinates of the image on the server
 *        repeat: how many times to send the image (0 for infinite)
 * (c) 2023-2025 Péter Bohner
 * License: MIT
 */

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <Imlib2.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <sys/types.h>

uint32_t *get_pixelbuf(char *file_path, int *width, int *height) {
  Imlib_Image image = imlib_load_image(file_path);
  if (!image) {
    printf("Error: cannot load image\n");
    exit(1);
  }
  imlib_context_set_image(image);
  *width = imlib_image_get_width();
  *height = imlib_image_get_height();

  uint32_t *argbbuf = imlib_image_get_data_for_reading_only();
  if (!argbbuf) {
    printf("Error: cannot get image data\n");
    exit(1);
  }
  return argbbuf;
}

int connect_to_server(char *host, int port) {
  // TODO: connect to server, return fd
  (void)host;
  (void)port;
  return 0;
}

void flood(int fd, uint32_t const *argbbuf, int w, int h, int x, int y) {
  // TODO: send pixels to server
  //       The (w * h) image should appear at (x, y) on the server
  //       argbbuf contains the loaded image in ARGB format (layed out
  //       row-by-row). For example, pixel (x=0, y=1) is at argbbuf[width].
  //       If it were pure green, argbbuf[width] would be 0x__00ff00,
  //       If it were violet, argbbuf[width] would be 0x__ff00ff,
  //       where __ is the alpha channel, which can be ignored.
  (void)fd;
  (void)argbbuf;
  (void)w;
  (void)h;
  (void)x;
  (void)y;
}

int main(int argc, char *argv[]) {
  if (argc != 7) {
    printf("Usage: %s <hostip> <port> <image_file_path> <origin-x> <origin-y> "
           "<repeat count>\n",
           argv[0]);
    return 1;
  }
  char *host = argv[1];
  int port = atoi(argv[2]);
  char *file_path = argv[3];
  int x = atoi(argv[4]);
  int y = atoi(argv[5]);
  int repeat = atoi(argv[6]);

  int width, height;
  uint32_t *argbbuf = get_pixelbuf(file_path, &width, &height);
  int fd = connect_to_server(host, port);
  if (fd < 0) {
    return 1;
  }

  for (int i = 0; i < repeat || repeat == 0; i++) {
    flood(fd, argbbuf, width, height, x, y);
  }
  return 0;
}