GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/o_time.c Lines: 38 44 86.4 %
Date: 2017-11-07 Branches: 4 8 50.0 %

Line Branch Exec Source
1
/* $OpenBSD: o_time.c,v 1.15 2014/06/12 15:49:27 deraadt Exp $ */
2
/* Written by Richard Levitte (richard@levitte.org) for the OpenSSL
3
 * project 2001.
4
 */
5
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
6
 * project 2008.
7
 */
8
/* ====================================================================
9
 * Copyright (c) 2001 The OpenSSL Project.  All rights reserved.
10
 *
11
 * Redistribution and use in source and binary forms, with or without
12
 * modification, are permitted provided that the following conditions
13
 * are met:
14
 *
15
 * 1. Redistributions of source code must retain the above copyright
16
 *    notice, this list of conditions and the following disclaimer.
17
 *
18
 * 2. Redistributions in binary form must reproduce the above copyright
19
 *    notice, this list of conditions and the following disclaimer in
20
 *    the documentation and/or other materials provided with the
21
 *    distribution.
22
 *
23
 * 3. All advertising materials mentioning features or use of this
24
 *    software must display the following acknowledgment:
25
 *    "This product includes software developed by the OpenSSL Project
26
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
27
 *
28
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
29
 *    endorse or promote products derived from this software without
30
 *    prior written permission. For written permission, please contact
31
 *    licensing@OpenSSL.org.
32
 *
33
 * 5. Products derived from this software may not be called "OpenSSL"
34
 *    nor may "OpenSSL" appear in their names without prior written
35
 *    permission of the OpenSSL Project.
36
 *
37
 * 6. Redistributions of any form whatsoever must retain the following
38
 *    acknowledgment:
39
 *    "This product includes software developed by the OpenSSL Project
40
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
41
 *
42
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
43
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
44
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
45
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
46
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
47
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
48
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
49
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
51
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
52
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
53
 * OF THE POSSIBILITY OF SUCH DAMAGE.
54
 * ====================================================================
55
 *
56
 * This product includes cryptographic software written by Eric Young
57
 * (eay@cryptsoft.com).  This product includes software written by Tim
58
 * Hudson (tjh@cryptsoft.com).
59
 *
60
 */
61
62
#include <string.h>
63
64
#include "o_time.h"
65
66
/* Take a tm structure and add an offset to it. This avoids any OS issues
67
 * with restricted date types and overflows which cause the year 2038
68
 * problem.
69
 */
70
71
#define SECS_PER_DAY (24 * 60 * 60)
72
73
static long date_to_julian(int y, int m, int d);
74
static void julian_to_date(long jd, int *y, int *m, int *d);
75
76
int
77
OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
78
{
79
	int offset_hms, offset_day;
80
	long time_jd;
81
104
	int time_year, time_month, time_day;
82
	/* split offset into days and day seconds */
83
52
	offset_day = offset_sec / SECS_PER_DAY;
84
	/* Avoid sign issues with % operator */
85
52
	offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
86
52
	offset_day += off_day;
87
	/* Add current time seconds to offset */
88
52
	offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
89
	/* Adjust day seconds if overflow */
90
52
	if (offset_hms >= SECS_PER_DAY) {
91
		offset_day++;
92
		offset_hms -= SECS_PER_DAY;
93
52
	} else if (offset_hms < 0) {
94
		offset_day--;
95
		offset_hms += SECS_PER_DAY;
96
	}
97
98
	/* Convert date of time structure into a Julian day number.
99
	 */
100
101
52
	time_year = tm->tm_year + 1900;
102
52
	time_month = tm->tm_mon + 1;
103
52
	time_day = tm->tm_mday;
104
105
52
	time_jd = date_to_julian(time_year, time_month, time_day);
106
107
	/* Work out Julian day of new date */
108
52
	time_jd += offset_day;
109
110
52
	if (time_jd < 0)
111
		return 0;
112
113
	/* Convert Julian day back to date */
114
115
52
	julian_to_date(time_jd, &time_year, &time_month, &time_day);
116
117
52
	if (time_year < 1900 || time_year > 9999)
118
		return 0;
119
120
	/* Update tm structure */
121
122
52
	tm->tm_year = time_year - 1900;
123
52
	tm->tm_mon = time_month - 1;
124
52
	tm->tm_mday = time_day;
125
126
52
	tm->tm_hour = offset_hms / 3600;
127
52
	tm->tm_min = (offset_hms / 60) % 60;
128
52
	tm->tm_sec = offset_hms % 60;
129
130
52
	return 1;
131
132
52
}
133
134
/* Convert date to and from julian day
135
 * Uses Fliegel & Van Flandern algorithm
136
 */
137
static long
138
date_to_julian(int y, int m, int d)
139
{
140
208
	return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
141
104
	    (367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
142
104
	    (3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 +
143
52
	    d - 32075;
144
}
145
146
static void
147
julian_to_date(long jd, int *y, int *m, int *d)
148
{
149
104
	long  L = jd + 68569;
150
52
	long  n = (4 * L) / 146097;
151
	long  i, j;
152
153
52
	L = L - (146097 * n + 3) / 4;
154
52
	i = (4000 * (L + 1)) / 1461001;
155
52
	L = L - (1461 * i) / 4 + 31;
156
52
	j = (80 * L) / 2447;
157
52
	*d = L - (2447 * j) / 80;
158
52
	L = j / 11;
159
52
	*m = j + 2 - (12 * L);
160
52
	*y = 100 * (n - 49) + i + L;
161
52
}