#include <locale.h>	/* setlocale */
#include <stdio.h>	/* wprintf */
#include <stdlib.h>	/* calloc, free, qsort, EXIT_* */
#include <string.h>	/* mbstowcs */
#include <wchar.h>	/* wcscoll */

static int my_collate(const void *p1, const void *p2)
{
	return wcscoll(*(const wchar_t **)p1, *(const wchar_t **)p2);
}

int main(void)
{
	char *loc;
	const char *stuff[5] = { "bug", "Amy", "Tom", "Gaz", "cat" };
	wchar_t *strs[5];
	setlocale(LC_ALL, "en_US.UTF-8");
	loc = setlocale(LC_ALL, NULL);
	if(loc == NULL || strcmp(loc, "en_US.UTF-8") != 0)
	{
		perror("setlocale");
		return EXIT_FAILURE;
	}

	for(int i = 0; i < 5; i++)
	{
		strs[i] = calloc(sizeof(wchar_t), 4);
		mbstowcs(strs[i], stuff[i], 3);
	}

	qsort(&strs, 5, sizeof(wchar_t *), my_collate);

	for(int i = 0; i < 5; i++)
	{
		wprintf(L"%ls\n", strs[i]);
		free(strs[i]);
	}
	return EXIT_SUCCESS;
}