#include <glib.h>
#include <glib/gprintf.h>

typedef struct Person Person;
struct Person
{
   const gchar *fn, *ln;
};

Person *
person_new (const gchar *fn, const gchar *ln)
{
   Person *this = g_new0(Person, 1);
   this->fn = fn;
   this->ln = ln;
   return this;
}

gint 
person_sort (gconstpointer a, gconstpointer b)
{
   gint ret = g_ascii_strcasecmp(((Person *)a)->ln, ((Person *)b)->ln);
   if(ret == 0)
      ret = g_ascii_strcasecmp(((Person *)a)->fn, ((Person *)b)->fn);

   return ret;
}

void 
person_print (gpointer data, gpointer user_data)
{
   g_printf("   %s, %s\n", ((Person *)data)->ln, ((Person *)data)->fn);
}

int 
main (int argc, char **argv)
{
   GSList *people = NULL;

#define APPEND(FN, LN) people = g_slist_append(people, person_new(FN, LN));
   APPEND("John", "Doe");
   APPEND("Bob", "Dole");
   APPEND("John", "Smith");
   APPEND("Jane", "Doe");
   APPEND("Foo", "Bar");

   g_printf("Original list:\n");
   g_slist_foreach(people, person_print, NULL);

   people = g_slist_sort(people, person_sort);

   g_printf("\nSorted list:\n");
   g_slist_foreach(people, person_print, NULL);

   return 0;
}