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adds UUID implementation

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


int
main(int argc, char **argv)
{
	u_char buf[BUFSIZ], len=8;
	int i;
	uuid_t uuid;

	printf("Random long=%x\n", e_random());
	if (argc > 1)
		len = MIN(atoi(argv[1]), sizeof buf);
	printf("Random buf ret=%d 0x", e_randbuf(buf, len));
	for (i = 0; i < len; i++)
		printf("%02x", buf[i]);
	printf("\n");

	printf("UUID gen ret=%d 0x", uuid_gen(uuid));
	for (i = 0; i < sizeof uuid; i++)
		printf("%02x", uuid[i]);
	printf("\n");

	printf("UUID string ret=%d ", uuid_str(uuid, buf, sizeof buf));
	printf("%s\n", buf);

	return 0;
}