1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
/* $OpenBSD: o_time.c,v 1.15 2014/06/12 15:49:27 deraadt Exp $ */
/* Written by Richard Levitte (richard@levitte.org) for the OpenSSL
* project 2001.
*/
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2008.
*/
/* ====================================================================
* Copyright (c) 2001 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <string.h>
#include "o_time.h"
/* Take a tm structure and add an offset to it. This avoids any OS issues
* with restricted date types and overflows which cause the year 2038
* problem.
*/
#define SECS_PER_DAY (24 * 60 * 60)
static long date_to_julian(int y, int m, int d);
static void julian_to_date(long jd, int *y, int *m, int *d);
int
OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
{
int offset_hms, offset_day;
long time_jd;
int time_year, time_month, time_day;
/* split offset into days and day seconds */
offset_day = offset_sec / SECS_PER_DAY;
/* Avoid sign issues with % operator */
offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
offset_day += off_day;
/* Add current time seconds to offset */
offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
/* Adjust day seconds if overflow */
if (offset_hms >= SECS_PER_DAY) {
offset_day++;
offset_hms -= SECS_PER_DAY;
} else if (offset_hms < 0) {
offset_day--;
offset_hms += SECS_PER_DAY;
}
/* Convert date of time structure into a Julian day number.
*/
time_year = tm->tm_year + 1900;
time_month = tm->tm_mon + 1;
time_day = tm->tm_mday;
time_jd = date_to_julian(time_year, time_month, time_day);
/* Work out Julian day of new date */
time_jd += offset_day;
if (time_jd < 0)
return 0;
/* Convert Julian day back to date */
julian_to_date(time_jd, &time_year, &time_month, &time_day);
if (time_year < 1900 || time_year > 9999)
return 0;
/* Update tm structure */
tm->tm_year = time_year - 1900;
tm->tm_mon = time_month - 1;
tm->tm_mday = time_day;
tm->tm_hour = offset_hms / 3600;
tm->tm_min = (offset_hms / 60) % 60;
tm->tm_sec = offset_hms % 60;
return 1;
}
/* Convert date to and from julian day
* Uses Fliegel & Van Flandern algorithm
*/
static long
date_to_julian(int y, int m, int d)
{
return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
(367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
(3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 +
d - 32075;
}
static void
julian_to_date(long jd, int *y, int *m, int *d)
{
long L = jd + 68569;
long n = (4 * L) / 146097;
long i, j;
L = L - (146097 * n + 3) / 4;
i = (4000 * (L + 1)) / 1461001;
L = L - (1461 * i) / 4 + 31;
j = (80 * L) / 2447;
*d = L - (2447 * j) / 80;
L = j / 11;
*m = j + 2 - (12 * L);
*y = 100 * (n - 49) + i + L;
}
|
