uuid_from_string.c revision 118670 
1148459Spjd/*-
2148459Spjd * Copyright (c) 2002 Marcel Moolenaar
3148459Spjd * Copyright (c) 2002 Hiten Mahesh Pandya
4148459Spjd * All rights reserved.
5148459Spjd *
6148459Spjd * Redistribution and use in source and binary forms, with or without
7148459Spjd * modification, are permitted provided that the following conditions
8148459Spjd * are met:
9148459Spjd * 1. Redistributions of source code must retain the above copyright
10148459Spjd *    notice, this list of conditions and the following disclaimer.
11148459Spjd * 2. Redistributions in binary form must reproduce the above copyright
12148459Spjd *    notice, this list of conditions and the following disclaimer in the
13148459Spjd *    documentation and/or other materials provided with the distribution.
14182452Spjd *
15148459Spjd * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16148459Spjd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17148459Spjd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18148459Spjd * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19148459Spjd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20148459Spjd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21148459Spjd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22148459Spjd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23148459Spjd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24148459Spjd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25148459Spjd * SUCH DAMAGE.
26148459Spjd *
27148459Spjd * $FreeBSD: head/lib/libc/uuid/uuid_from_string.c 118670 2003-08-08 19:18:43Z marcel $
28148459Spjd */
29148459Spjd
30148459Spjd#include <stdio.h>
31148459Spjd#include <string.h>
32148459Spjd#include <uuid.h>
33148459Spjd
34148459Spjd/*
35148459Spjd * uuid_from_string() - convert a string representation of an UUID into
36148459Spjd *			a binary representation.
37148459Spjd * See also:
38148459Spjd *	http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm
39148459Spjd *
40148459Spjd * NOTE: The sequence field is in big-endian, while the time fields are in
41148459Spjd *	 native byte order.
42148459Spjd */
43148459Spjdvoid
44148459Spjduuid_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