1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002 Marcel Moolenaar
5 * Copyright (c) 2002 Hiten Mahesh Pandya
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32 #include <stdio.h>
33 #include <string.h>
34 #include <uuid.h>
35
36 /*
37 * uuid_from_string() - convert a string representation of an UUID into
38 * a binary representation.
39 * See also:
40 * http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm
41 *
42 * NOTE: The sequence field is in big-endian, while the time fields are in
43 * native byte order.
44 */
45 void
uuid_from_string(const char * s,uuid_t * u,uint32_t * status)46 uuid_from_string(const char *s, uuid_t *u, uint32_t *status)
47 {
48 int n;
49
50 /* Short-circuit 2 special cases: NULL pointer and empty string. */
51 if (s == NULL || *s == '\0') {
52 uuid_create_nil(u, status);
53 return;
54 }
55
56 /* Assume the worst. */
57 if (status != NULL)
58 *status = uuid_s_invalid_string_uuid;
59
60 /* The UUID string representation has a fixed length. */
61 if (strlen(s) != 36)
62 return;
63
64 /*
65 * We only work with "new" UUIDs. New UUIDs have the form:
66 * 01234567-89ab-cdef-0123-456789abcdef
67 * The so called "old" UUIDs, which we don't support, have the form:
68 * 0123456789ab.cd.ef.01.23.45.67.89.ab
69 */
70 if (s[8] != '-')
71 return;
72
73 n = sscanf(s,
74 "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx",
75 &u->time_low, &u->time_mid, &u->time_hi_and_version,
76 &u->clock_seq_hi_and_reserved, &u->clock_seq_low, &u->node[0],
77 &u->node[1], &u->node[2], &u->node[3], &u->node[4], &u->node[5]);
78
79 /* Make sure we have all conversions. */
80 if (n != 11)
81 return;
82
83 /* We have a successful scan. Check semantics... */
84 n = u->clock_seq_hi_and_reserved;
85 if ((n & 0x80) != 0x00 && /* variant 0? */
86 (n & 0xc0) != 0x80 && /* variant 1? */
87 (n & 0xe0) != 0xc0) { /* variant 2? */
88 if (status != NULL)
89 *status = uuid_s_bad_version;
90 } else {
91 if (status != NULL)
92 *status = uuid_s_ok;
93 }
94 }
95