uuid_to_string.c revision 331722 
1/*-
2 * Copyright (c) 2002,2005 Marcel Moolenaar
3 * Copyright (c) 2002 Hiten Mahesh Pandya
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: stable/11/lib/libc/uuid/uuid_to_string.c 331722 2018-03-29 02:50:57Z eadler $
28 */
29
30#include <stdio.h>
31#include <string.h>
32#include <uuid.h>
33
34/*
35 * uuid_to_string() - Convert a binary UUID into a string representation.
36 * See also:
37 *	http://www.opengroup.org/onlinepubs/009629399/uuid_to_string.htm
38 *
39 * NOTE: The references given above do not have a status code for when
40 *	 the string could not be allocated. The status code has been
41 *	 taken from the Hewlett-Packard implementation.
42 */
43void
44uuid_to_string(const uuid_t *u, char **s, uint32_t *status)
45{
46	uuid_t nil;
47
48	if (status != NULL)
49		*status = uuid_s_ok;
50
51	/* Why allow a NULL-pointer here? */
52	if (s == NULL)
53		return;
54
55	if (u == NULL) {
56		u = &nil;
57		uuid_create_nil(&nil, NULL);
58	}
59
60	asprintf(s, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
61	    u->time_low, u->time_mid, u->time_hi_and_version,
62	    u->clock_seq_hi_and_reserved, u->clock_seq_low, u->node[0],
63	    u->node[1], u->node[2], u->node[3], u->node[4], u->node[5]);
64
65	if (*s == NULL && status != NULL)
66		*status = uuid_s_no_memory;
67}
68