1 /* $NetBSD: uuid_from_string.c,v 1.1 2004/09/13 21:44:54 thorpej Exp $ */
2
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: src/lib/libc/uuid/uuid_from_string.c,v 1.2 2003/08/08 19:18:43 marcel Exp $
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 __RCSID("$NetBSD: uuid_from_string.c,v 1.1 2004/09/13 21:44:54 thorpej Exp $");
35 #endif
36
37 #include "namespace.h"
38
39 #include <stdio.h>
40 #include <string.h>
41 #include <uuid.h>
42
43 /*
44 * uuid_from_string() - convert a string representation of an UUID into
45 * a binary representation.
46 * See also:
47 * http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm
48 *
49 * NOTE: The sequence field is in big-endian, while the time fields are in
50 * native byte order.
51 */
52 void
uuid_from_string(const char * s,uuid_t * u,uint32_t * status)53 uuid_from_string(const char *s, uuid_t *u, uint32_t *status)
54 {
55 int n;
56
57 /* Short-circuit 2 special cases: NULL pointer and empty string. */
58 if (s == NULL || *s == '\0') {
59 uuid_create_nil(u, status);
60 return;
61 }
62
63 /* Assume the worst. */
64 if (status != NULL)
65 *status = uuid_s_invalid_string_uuid;
66
67 /* The UUID string representation has a fixed length. */
68 if (strlen(s) != 36)
69 return;
70
71 /*
72 * We only work with "new" UUIDs. New UUIDs have the form:
73 * 01234567-89ab-cdef-0123-456789abcdef
74 * The so called "old" UUIDs, which we don't support, have the form:
75 * 0123456789ab.cd.ef.01.23.45.67.89.ab
76 */
77 if (s[8] != '-')
78 return;
79
80 n = sscanf(s,
81 "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx",
82 &u->time_low, &u->time_mid, &u->time_hi_and_version,
83 &u->clock_seq_hi_and_reserved, &u->clock_seq_low, &u->node[0],
84 &u->node[1], &u->node[2], &u->node[3], &u->node[4], &u->node[5]);
85
86 /* Make sure we have all conversions. */
87 if (n != 11)
88 return;
89
90 /* We have a successful scan. Check semantics... */
91 n = u->clock_seq_hi_and_reserved;
92 if ((n & 0x80) != 0x00 && /* variant 0? */
93 (n & 0xc0) != 0x80 && /* variant 1? */
94 (n & 0xe0) != 0xc0) { /* variant 2? */
95 if (status != NULL)
96 *status = uuid_s_bad_version;
97 } else {
98 if (status != NULL)
99 *status = uuid_s_ok;
100 }
101 }
102