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|
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2013 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;
}
|
