sample.txt

// VNC Hooks
static void goneClient(rfbClientPtr client) {
  client->clientData = NULL;
  connectedClients--;
}
static enum rfbNewClientAction newClient(rfbClientPtr client) {
  client->clientGoneHook = goneClient;
  connectedClients++;
  return RFB_CLIENT_ACCEPT;
}

// Count card entries
int countEntries() {
  int entries = 0;

  // Regular expression for /dev/dri/cardX
  regex_t regExp;
  regcomp(&regExp, "^card[0-9]*$", REG_NOSUB);

  // Scan through /dev/dri to find card entries
  DIR *dir = opendir("/dev/dri");
  if(dir != NULL) {
    struct dirent *dirEntry;
    while ((dirEntry = readdir(dir))) {
      if(!regexec(&regExp, dirEntry->d_name, 0, NULL, 0)) {
        entries++;
      }
    }
  } else {
    printf("Couldn't open /dev/dri\n");
  }

  return entries++;
}

char * allocateVNCFramebuffer(rfbScreenInfoPtr screen) {
  return buffer.buffer;
}

// Find available node
int findAvailableNode() {
  int availableNode = -1;

  do {
    int cardEntries = countEntries();
    
    for(int i = 0; i < cardEntries; i++) {
      if (evdi_check_device(i) == AVAILABLE) {
        availableNode = i;
        goto end;
      }
    }

    if(!evdi_add_device()) {
      printf("Couldn't create evdi node. Check if evdi module is loaded.\n");
      break;
    }
  } while(availableNode == -1);
  end: ;

  return availableNode;
}

// Open node
evdi_handle openNode() {
  int entryNumber = findAvailableNode();

  if(entryNumber == -1) {
    return EVDI_INVALID_HANDLE;
  }

  return evdi_open(entryNumber);
}