/* cc -o list-extensions `pkg-config --libs --cflags xcb` list-extensions.c */

#include <xcb/xcb.h>
#include <xcb/xproto.h>
#include <stdio.h>

void
fixed_xcb_str_next(xcb_str_iterator_t* it)
{
  it->data = (void*) ((char*) it->data + it->data->name_len + 1);
  --it->rem;
}

int
main()
{
  xcb_connection_t* ctrl = xcb_connect(NULL, NULL);
  xcb_generic_error_t* error;
  xcb_list_extensions_cookie_t ext_cookie;
  xcb_list_extensions_reply_t* ext_reply;

  if ((!ctrl || xcb_connection_has_error(ctrl))) {
    fprintf(stderr, "Failed to connect to the display\n");
    return 1;
  }

  ext_cookie = xcb_list_extensions(ctrl);
  error = NULL;
  ext_reply = xcb_list_extensions_reply(ctrl, ext_cookie, &error);
  if (!ext_reply || error) {
    fprintf(stderr, "Failed to request list of extensions\n");
    return 1;
  }
  {
    xcb_str_iterator_t it = xcb_list_extensions_names_iterator(ext_reply);
    while (it.rem) {
      printf("%d bytes: ", xcb_str_name_length(it.data));
      fwrite(xcb_str_name(it.data), 1, xcb_str_name_length(it.data), stdout);
      printf("\n");
      xcb_str_next(&it);
    }
  }
}