1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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
30 #include <stdio.h>
31 #include <string.h>
32 #include <uuid.h>
33
34 /*
35 * uuid_from_string() - convert a string representation of an UUID into
36 * a binary representation.
37 * See also:
38 * http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm
39 *
40 * NOTE: The sequence field is in big-endian, while the time fields are in
41 * native byte order.
42 */
43 void
uuid_from_string(const char * s,uuid_t * u,uint32_t * status)44 uuid_from_string(const char *s, uuid_t *u, uint32_t *status)
45 {
46 int n;
47
48 /* Short-circuit 2 special cases: NULL pointer and empty string. */
49 if (s == NULL || *s == '\0') {
50 uuid_create_nil(u, status);
51 return;
52 }
53
54 /* Assume the worst. */
55 if (status != NULL)
56 *status = uuid_s_invalid_string_uuid;
57
58 /* The UUID string representation has a fixed length. */
59 if (strlen(s) != 36)
60 return;
61
62 /*
63 * We only work with "new" UUIDs. New UUIDs have the form:
64 * 01234567-89ab-cdef-0123-456789abcdef
65 * The so called "old" UUIDs, which we don't support, have the form:
66 * 0123456789ab.cd.ef.01.23.45.67.89.ab
67 */
68 if (s[8] != '-')
69 return;
70
71 n = sscanf(s,
72 "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx",
73 &u->time_low, &u->time_mid, &u->time_hi_and_version,
74 &u->clock_seq_hi_and_reserved, &u->clock_seq_low, &u->node[0],
75 &u->node[1], &u->node[2], &u->node[3], &u->node[4], &u->node[5]);
76
77 /* Make sure we have all conversions. */
78 if (n != 11)
79 return;
80
81 /* We have a successful scan. Check semantics... */
82 n = u->clock_seq_hi_and_reserved;
83 if ((n & 0x80) != 0x00 && /* variant 0? */
84 (n & 0xc0) != 0x80 && /* variant 1? */
85 (n & 0xe0) != 0xc0) { /* variant 2? */
86 if (status != NULL)
87 *status = uuid_s_bad_version;
88 } else {
89 if (status != NULL)
90 *status = uuid_s_ok;
91 }
92 }
93