1 // Copyright (c) 2007, Google Inc.
2 // All rights reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
6 // met:
7 //
8 // * Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // * Redistributions in binary form must reproduce the above
11 // copyright notice, this list of conditions and the following disclaimer
12 // in the documentation and/or other materials provided with the
13 // distribution.
14 // * Neither the name of Google Inc. nor the names of its
15 // contributors may be used to endorse or promote products derived from
16 // this software without specific prior written permission.
17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30 // Author: Alfred Peng
31
32 #include <cassert>
33 #include <ctime>
34
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <unistd.h>
38
39 #include "common/solaris/guid_creator.h"
40
41 //
42 // GUIDGenerator
43 //
44 // This class is used to generate random GUID.
45 // Currently use random number to generate a GUID. This should be OK since
46 // we don't expect crash to happen very offen.
47 //
48 class GUIDGenerator {
49 public:
GUIDGenerator()50 GUIDGenerator() {
51 srandom(time(NULL));
52 }
53
CreateGUID(GUID * guid) const54 bool CreateGUID(GUID *guid) const {
55 guid->data1 = random();
56 guid->data2 = (uint16_t)(random());
57 guid->data3 = (uint16_t)(random());
58 *reinterpret_cast<uint32_t*>(&guid->data4[0]) = random();
59 *reinterpret_cast<uint32_t*>(&guid->data4[4]) = random();
60 return true;
61 }
62 };
63
64 // Guid generator.
65 const GUIDGenerator kGuidGenerator;
66
CreateGUID(GUID * guid)67 bool CreateGUID(GUID *guid) {
68 return kGuidGenerator.CreateGUID(guid);
69 }
70
71 // Parse guid to string.
GUIDToString(const GUID * guid,char * buf,int buf_len)72 bool GUIDToString(const GUID *guid, char *buf, int buf_len) {
73 // Should allow more space the the max length of GUID.
74 assert(buf_len > kGUIDStringLength);
75 int num = snprintf(buf, buf_len, kGUIDFormatString,
76 guid->data1, guid->data2, guid->data3,
77 *reinterpret_cast<const uint32_t *>(&(guid->data4[0])),
78 *reinterpret_cast<const uint32_t *>(&(guid->data4[4])));
79 if (num != kGUIDStringLength)
80 return false;
81
82 buf[num] = '\0';
83 return true;
84 }
85