Quick and dirty `xcb_list_fonts` demo

list_fonts.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <xcb/xcb.h>

static void list_fonts(xcb_connection_t *c)
{
    // On my mac there are 10,000+ fonts!
    uint16_t max_names = 20000;
    const char *pattern = "*";
    uint16_t pattern_length = strlen(pattern);
    xcb_list_fonts_cookie_t fonts_cookie = xcb_list_fonts(c, max_names, pattern_length, pattern);
    xcb_generic_error_t *error = NULL;
    xcb_list_fonts_reply_t *fonts_reply = xcb_list_fonts_reply(c, fonts_cookie, &error);
    // Should error check here.
    int nfonts = xcb_list_fonts_names_length(fonts_reply);
    printf("Got %d fonts\n", nfonts);
    
    for (xcb_str_iterator_t names_iterator = xcb_list_fonts_names_iterator(fonts_reply);
         names_iterator.rem != 0; xcb_str_next(&names_iterator))
    {
        // WARNING: Not null-terminated!
        const char *name = xcb_str_name(names_iterator.data);
        int name_length = xcb_str_name_length(names_iterator.data);
        printf("%.*s\n", name_length, name);
        ;
    }
}