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dis-bench / src /php /php-src /ext /date /lib /interval.c
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/*
* The MIT License (MIT)
*
* Copyright (c) 2015-2019 Derick Rethans
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "timelib.h"
#include "timelib_private.h"
#include <math.h>
static void swap_times(timelib_time **one, timelib_time **two, timelib_rel_time *rt)
{
timelib_time *swp;
swp = *two;
*two = *one;
*one = swp;
rt->invert = 1;
}
static void sort_old_to_new(timelib_time **one, timelib_time **two, timelib_rel_time *rt)
{
/* Check whether date/times need to be inverted. If both times are
* TIMELIB_ZONETYPE_ID times with the same TZID, we use the y-s + us fields. */
if (
(*one)->zone_type == TIMELIB_ZONETYPE_ID &&
(*two)->zone_type == TIMELIB_ZONETYPE_ID &&
(strcmp((*one)->tz_info->name, (*two)->tz_info->name) == 0)
) {
if (
((*one)->y > (*two)->y) ||
((*one)->y == (*two)->y && (*one)->m > (*two)->m) ||
((*one)->y == (*two)->y && (*one)->m == (*two)->m && (*one)->d > (*two)->d) ||
((*one)->y == (*two)->y && (*one)->m == (*two)->m && (*one)->d == (*two)->d && (*one)->h > (*two)->h) ||
((*one)->y == (*two)->y && (*one)->m == (*two)->m && (*one)->d == (*two)->d && (*one)->h == (*two)->h && (*one)->i > (*two)->i) ||
((*one)->y == (*two)->y && (*one)->m == (*two)->m && (*one)->d == (*two)->d && (*one)->h == (*two)->h && (*one)->i == (*two)->i && (*one)->s > (*two)->s) ||
((*one)->y == (*two)->y && (*one)->m == (*two)->m && (*one)->d == (*two)->d && (*one)->h == (*two)->h && (*one)->i == (*two)->i && (*one)->s == (*two)->s && (*one)->us > (*two)->us)
) {
swap_times(one, two, rt);
}
return;
}
/* Fall back to using the SSE instead to rearrange */
if (
((*one)->sse > (*two)->sse) ||
((*one)->sse == (*two)->sse && (*one)->us > (*two)->us)
) {
swap_times(one, two, rt);
}
}
static timelib_rel_time *timelib_diff_with_tzid(timelib_time *one, timelib_time *two)
{
timelib_rel_time *rt;
timelib_sll dst_corr = 0, dst_h_corr = 0, dst_m_corr = 0;
int32_t trans_offset;
timelib_sll trans_transition_time;
rt = timelib_rel_time_ctor();
rt->invert = 0;
sort_old_to_new(&one, &two, rt);
/* Calculate correction for UTC offset changes between first and second SSE */
dst_corr = two->z - one->z;
dst_h_corr = dst_corr / 3600;
dst_m_corr = (dst_corr % 3600) / 60;
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;
rt->us = two->us - one->us;
rt->days = timelib_diff_days(one, two);
/* Fall Back: Cater for transition period, where rt->invert is 0, but there are negative numbers */
if (two->sse < one->sse) {
timelib_sll flipped = llabs((rt->i * 60) + (rt->s) - dst_corr);
rt->h = flipped / SECS_PER_HOUR;
rt->i = (flipped - rt->h * SECS_PER_HOUR) / 60;
rt->s = flipped % 60;
rt->invert = 1 - rt->invert;
}
timelib_do_rel_normalize(rt->invert ? one : two, rt);
if (one->dst == 1 && two->dst == 0) { /* Fall Back */
if (two->tz_info) {
if ((two->sse - one->sse + dst_corr) < SECS_PER_DAY) {
rt->h -= dst_h_corr;
rt->i -= dst_m_corr;
}
}
} else if (one->dst == 0 && two->dst == 1) { /* Spring Forward */
if (two->tz_info) {
int success = timelib_get_time_zone_offset_info(two->sse, two->tz_info, &trans_offset, &trans_transition_time, NULL);
if (
success &&
!((one->sse + SECS_PER_DAY > trans_transition_time) && (one->sse + SECS_PER_DAY <= (trans_transition_time + dst_corr))) &&
two->sse >= trans_transition_time &&
((two->sse - one->sse + dst_corr) % SECS_PER_DAY) > (two->sse - trans_transition_time)
) {
rt->h -= dst_h_corr;
rt->i -= dst_m_corr;
}
}
} else if (two->sse - one->sse >= SECS_PER_DAY) {
/* Check whether we're in the period to the next transition time */
if (timelib_get_time_zone_offset_info(two->sse - two->z, two->tz_info, &trans_offset, &trans_transition_time, NULL)) {
dst_corr = one->z - trans_offset;
if (two->sse >= trans_transition_time - dst_corr && two->sse < trans_transition_time) {
rt->d--;
rt->h = 24;
}
}
}
return rt;
}
timelib_rel_time *timelib_diff(timelib_time *one, timelib_time *two)
{
timelib_rel_time *rt;
if (one->zone_type == TIMELIB_ZONETYPE_ID && two->zone_type == TIMELIB_ZONETYPE_ID && strcmp(one->tz_info->name, two->tz_info->name) == 0) {
return timelib_diff_with_tzid(one, two);
}
rt = timelib_rel_time_ctor();
rt->invert = 0;
sort_old_to_new(&one, &two, rt);
rt->y = two->y - one->y;
rt->m = two->m - one->m;
rt->d = two->d - one->d;
rt->h = two->h - one->h;
if (one->zone_type != TIMELIB_ZONETYPE_ID) {
rt->h = rt->h + one->dst;
}
if (two->zone_type != TIMELIB_ZONETYPE_ID) {
rt->h = rt->h - two->dst;
}
rt->i = two->i - one->i;
rt->s = two->s - one->s - two->z + one->z;
rt->us = two->us - one->us;
rt->days = timelib_diff_days(one, two);
timelib_do_rel_normalize(rt->invert ? one : two, rt);
return rt;
}
int timelib_diff_days(timelib_time *one, timelib_time *two)
{
int days = 0;
if (timelib_same_timezone(one, two)) {
timelib_time *earliest, *latest;
double earliest_time, latest_time;
if (timelib_time_compare(one, two) < 0) {
earliest = one;
latest = two;
} else {
earliest = two;
latest = one;
}
timelib_hmsf_to_decimal_hour(earliest->h, earliest->i, earliest->s, earliest->us, &earliest_time);
timelib_hmsf_to_decimal_hour(latest->h, latest->i, latest->s, latest->us, &latest_time);
days = llabs(timelib_epoch_days_from_time(one) - timelib_epoch_days_from_time(two));
if (latest_time < earliest_time && days > 0) {
days--;
}
} else {
days = fabs(floor(one->sse - two->sse) / 86400);
}
return days;
}
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(timelib_rel_time));
} else {
if (interval->invert) {
bias = -1;
}
memset(&t->relative, 0, sizeof(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->relative.us = interval->us * bias;
}
t->have_relative = 1;
t->sse_uptodate = 0;
timelib_update_ts(t, NULL);
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(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->relative.us = 0 - (interval->us * bias);
t->have_relative = 1;
t->sse_uptodate = 0;
timelib_update_ts(t, NULL);
timelib_update_from_sse(t);
t->have_relative = 0;
return t;
}
static void do_range_limit(timelib_sll start, timelib_sll end, timelib_sll adj, timelib_sll *a, timelib_sll *b)
{
if (*a < start) {
*b -= (start - *a - 1) / adj + 1;
*a += adj * ((start - *a - 1) / adj + 1);
}
if (*a >= end) {
*b += *a / adj;
*a -= adj * (*a / adj);
}
}
timelib_time *timelib_add_wall(timelib_time *old_time, timelib_rel_time *interval)
{
int bias = 1;
timelib_time *t = timelib_time_clone(old_time);
t->have_relative = 1;
t->sse_uptodate = 0;
if (interval->have_weekday_relative || interval->have_special_relative) {
memcpy(&t->relative, interval, sizeof(timelib_rel_time));
timelib_update_ts(t, NULL);
timelib_update_from_sse(t);
} else {
if (interval->invert) {
bias = -1;
}
memset(&t->relative, 0, sizeof(timelib_rel_time));
t->relative.y = interval->y * bias;
t->relative.m = interval->m * bias;
t->relative.d = interval->d * bias;
if (t->relative.y || t->relative.m || t->relative.d) {
timelib_update_ts(t, NULL);
}
if (interval->us == 0) {
t->sse += bias * timelib_hms_to_seconds(interval->h, interval->i, interval->s);
timelib_update_from_sse(t);
} else {
timelib_rel_time *temp_interval = timelib_rel_time_clone(interval);
do_range_limit(0, 1000000, 1000000, &temp_interval->us, &temp_interval->s);
t->sse += bias * timelib_hms_to_seconds(temp_interval->h, temp_interval->i, temp_interval->s);
timelib_update_from_sse(t);
t->us += temp_interval->us * bias;
timelib_do_normalize(t);
timelib_update_ts(t, NULL);
timelib_rel_time_dtor(temp_interval);
}
timelib_do_normalize(t);
}
if (t->zone_type == TIMELIB_ZONETYPE_ID) {
timelib_set_timezone(t, t->tz_info);
}
t->have_relative = 0;
return t;
}
timelib_time *timelib_sub_wall(timelib_time *old_time, timelib_rel_time *interval)
{
int bias = 1;
timelib_time *t = timelib_time_clone(old_time);
t->have_relative = 1;
t->sse_uptodate = 0;
if (interval->have_weekday_relative || interval->have_special_relative) {
memcpy(&t->relative, interval, sizeof(timelib_rel_time));
timelib_update_ts(t, NULL);
timelib_update_from_sse(t);
} else {
if (interval->invert) {
bias = -1;
}
memset(&t->relative, 0, sizeof(timelib_rel_time));
t->relative.y = 0 - (interval->y * bias);
t->relative.m = 0 - (interval->m * bias);
t->relative.d = 0 - (interval->d * bias);
if (t->relative.y || t->relative.m || t->relative.d) {
timelib_update_ts(t, NULL);
}
if (interval->us == 0) {
t->sse -= bias * timelib_hms_to_seconds(interval->h, interval->i, interval->s);
timelib_update_from_sse(t);
} else {
timelib_rel_time *temp_interval = timelib_rel_time_clone(interval);
do_range_limit(0, 1000000, 1000000, &temp_interval->us, &temp_interval->s);
t->sse -= bias * timelib_hms_to_seconds(temp_interval->h, temp_interval->i, temp_interval->s);
timelib_update_from_sse(t);
t->us -= temp_interval->us * bias;
timelib_do_normalize(t);
timelib_update_ts(t, NULL);
timelib_rel_time_dtor(temp_interval);
}
timelib_do_normalize(t);
}
if (t->zone_type == TIMELIB_ZONETYPE_ID) {
timelib_set_timezone(t, t->tz_info);
}
t->have_relative = 0;
return t;
}