1 /*-
2 * Copyright (c) 2015 M. Warner Losh <imp@FreeBSD.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26
27 /*
28 * Note: some comments taken from lib/libc/uuid/uuid_to_string.c
29 * Copyright (c) 2002,2005 Marcel Moolenaar
30 * Copyright (c) 2002 Hiten Mahesh Pandya
31 */
32
33 #include <stand.h>
34 #include <uuid.h>
35
36 /*
37 * Dump len characters into *buf from val as hex and update *buf
38 */
39 static void
tohex(char ** buf,int len,uint32_t val)40 tohex(char **buf, int len, uint32_t val)
41 {
42 static const char *hexstr = "0123456789abcdef";
43 char *walker = *buf;
44 int i;
45
46 for (i = len - 1; i >= 0; i--) {
47 walker[i] = hexstr[val & 0xf];
48 val >>= 4;
49 }
50 *buf = walker + len;
51 }
52
53 /*
54 * uuid_to_string() - Convert a binary UUID into a string representation.
55 * See also:
56 * http://www.opengroup.org/onlinepubs/009629399/uuid_to_string.htm
57 *
58 * NOTE: The references given above do not have a status code for when
59 * the string could not be allocated. The status code has been
60 * taken from the Hewlett-Packard implementation.
61 *
62 * NOTE: we don't support u == NULL for a nil UUID, sorry.
63 *
64 * NOTE: The sequence field is in big-endian, while the time fields are in
65 * native byte order.
66 *
67 * hhhhhhhh-hhhh-hhhh-bbbb-bbbbbbbbbbbb
68 * 01234567-89ab-cdef-0123-456789abcdef
69 */
70 void
uuid_to_string(const uuid_t * u,char ** s,uint32_t * status)71 uuid_to_string(const uuid_t *u, char **s, uint32_t *status)
72 {
73 uuid_t nil;
74 char *w;
75
76 if (status != NULL)
77 *status = uuid_s_ok;
78 if (s == NULL) /* Regular version does this odd-ball behavior too */
79 return;
80 w = *s = malloc(37);
81 if (*s == NULL) {
82 if (status != NULL)
83 *status = uuid_s_no_memory;
84 return;
85 }
86 if (u == NULL) {
87 u = &nil;
88 uuid_create_nil(&nil, NULL);
89 }
90 /* native */
91 tohex(&w, 8, u->time_low);
92 *w++ = '-';
93 tohex(&w, 4, u->time_mid);
94 *w++ = '-';
95 tohex(&w, 4, u->time_hi_and_version);
96 *w++ = '-';
97 /* Big endian, so do a byte at a time */
98 tohex(&w, 2, u->clock_seq_hi_and_reserved);
99 tohex(&w, 2, u->clock_seq_low);
100 *w++ = '-';
101 tohex(&w, 2, u->node[0]);
102 tohex(&w, 2, u->node[1]);
103 tohex(&w, 2, u->node[2]);
104 tohex(&w, 2, u->node[3]);
105 tohex(&w, 2, u->node[4]);
106 tohex(&w, 2, u->node[5]);
107 *w++ = '\0';
108 }
109