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
162
163
164
165
|
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2015 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Derick Rethans <derick@derickrethans.nl> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "timelib.h"
#include <math.h>
timelib_rel_time *timelib_diff(timelib_time *one, timelib_time *two)
{
timelib_rel_time *rt;
timelib_time *swp;
timelib_sll dst_corr = 0 ,dst_h_corr = 0, dst_m_corr = 0;
timelib_time one_backup, two_backup;
rt = timelib_rel_time_ctor();
rt->invert = 0;
if (one->sse > two->sse) {
swp = two;
two = one;
one = swp;
rt->invert = 1;
}
/* Calculate correction for DST change over, but only if the TZ type is ID
* and it's the same */
if (one->zone_type == 3 && two->zone_type == 3
&& (strcmp(one->tz_info->name, two->tz_info->name) == 0)
&& (one->z != two->z))
{
dst_corr = two->z - one->z;
dst_h_corr = dst_corr / 3600;
dst_m_corr = (dst_corr % 3600) / 60;
}
/* Save old TZ info */
memcpy(&one_backup, one, sizeof(one_backup));
memcpy(&two_backup, two, sizeof(two_backup));
timelib_apply_localtime(one, 0);
timelib_apply_localtime(two, 0);
rt->y = two->y - one->y;
rt->m = two->m - one->m;
rt->d = two->d - one->d;
rt->h = two->h - one->h;
rt->i = two->i - one->i;
rt->s = two->s - one->s;
if (one_backup.dst == 0 && two_backup.dst == 1 && two->sse >= one->sse + 86400 - dst_corr) {
rt->h += dst_h_corr;
rt->i += dst_m_corr;
}
rt->days = abs(floor((one->sse - two->sse - (dst_h_corr * 3600) - (dst_m_corr * 60)) / 86400));
timelib_do_rel_normalize(rt->invert ? one : two, rt);
/* We need to do this after normalisation otherwise we can't get "24H" */
if (one_backup.dst == 1 && two_backup.dst == 0 && two->sse >= one->sse + 86400) {
if (two->sse < one->sse + 86400 - dst_corr) {
rt->d--;
rt->h = 24;
} else {
rt->h += dst_h_corr;
rt->i += dst_m_corr;
}
}
/* Restore old TZ info */
memcpy(one, &one_backup, sizeof(one_backup));
memcpy(two, &two_backup, sizeof(two_backup));
return rt;
}
timelib_time *timelib_add(timelib_time *old_time, timelib_rel_time *interval)
{
int bias = 1;
timelib_time *t = timelib_time_clone(old_time);
if (interval->have_weekday_relative || interval->have_special_relative) {
memcpy(&t->relative, interval, sizeof(struct timelib_rel_time));
} else {
if (interval->invert) {
bias = -1;
}
memset(&t->relative, 0, sizeof(struct timelib_rel_time));
t->relative.y = interval->y * bias;
t->relative.m = interval->m * bias;
t->relative.d = interval->d * bias;
t->relative.h = interval->h * bias;
t->relative.i = interval->i * bias;
t->relative.s = interval->s * bias;
}
t->have_relative = 1;
t->sse_uptodate = 0;
timelib_update_ts(t, NULL);
// printf("%lld %lld %d\n", old_time->dst, t->dst, (t->sse - old_time->sse));
/* Adjust for backwards DST changeover */
if (old_time->dst == 1 && t->dst == 0 && !interval->y && !interval->m && !interval->d) {
t->sse -= old_time->z;
t->sse += t->z;
}
timelib_update_from_sse(t);
t->have_relative = 0;
return t;
}
timelib_time *timelib_sub(timelib_time *old_time, timelib_rel_time *interval)
{
int bias = 1;
timelib_time *t = timelib_time_clone(old_time);
if (interval->invert) {
bias = -1;
}
memset(&t->relative, 0, sizeof(struct timelib_rel_time));
t->relative.y = 0 - (interval->y * bias);
t->relative.m = 0 - (interval->m * bias);
t->relative.d = 0 - (interval->d * bias);
t->relative.h = 0 - (interval->h * bias);
t->relative.i = 0 - (interval->i * bias);
t->relative.s = 0 - (interval->s * bias);
t->have_relative = 1;
t->sse_uptodate = 0;
timelib_update_ts(t, NULL);
/* Adjust for backwards DST changeover */
if (old_time->dst == 1 && t->dst == 0 && !interval->y && !interval->m && !interval->d) {
t->sse -= old_time->z;
t->sse += t->z;
}
/* Adjust for forwards DST changeover */
if (old_time->dst == 0 && t->dst == 1 && !interval->y && !interval->m && !interval->d ) {
t->sse -= old_time->z;
t->sse += t->z;
}
timelib_update_from_sse(t);
t->have_relative = 0;
return t;
}
|
