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166 lines
4.9 KiB
C
166 lines
4.9 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 5 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2014 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Derick Rethans <derick@derickrethans.nl> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#include "timelib.h"
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#include <math.h>
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timelib_rel_time *timelib_diff(timelib_time *one, timelib_time *two)
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{
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timelib_rel_time *rt;
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timelib_time *swp;
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timelib_sll dst_corr = 0 ,dst_h_corr = 0, dst_m_corr = 0;
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timelib_time one_backup, two_backup;
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rt = timelib_rel_time_ctor();
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rt->invert = 0;
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if (one->sse > two->sse) {
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swp = two;
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two = one;
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one = swp;
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rt->invert = 1;
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}
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/* Calculate correction for DST change over, but only if the TZ type is ID
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* and it's the same */
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if (one->zone_type == 3 && two->zone_type == 3
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&& (strcmp(one->tz_info->name, two->tz_info->name) == 0)
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&& (one->z != two->z))
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{
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dst_corr = two->z - one->z;
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dst_h_corr = dst_corr / 3600;
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dst_m_corr = (dst_corr % 3600) / 60;
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}
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/* Save old TZ info */
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memcpy(&one_backup, one, sizeof(one_backup));
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memcpy(&two_backup, two, sizeof(two_backup));
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timelib_apply_localtime(one, 0);
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timelib_apply_localtime(two, 0);
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rt->y = two->y - one->y;
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rt->m = two->m - one->m;
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rt->d = two->d - one->d;
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rt->h = two->h - one->h;
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rt->i = two->i - one->i;
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rt->s = two->s - one->s;
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if (one_backup.dst == 0 && two_backup.dst == 1 && two->sse >= one->sse + 86400 - dst_corr) {
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rt->h += dst_h_corr;
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rt->i += dst_m_corr;
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}
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rt->days = abs(floor((one->sse - two->sse - (dst_h_corr * 3600) - (dst_m_corr * 60)) / 86400));
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timelib_do_rel_normalize(rt->invert ? one : two, rt);
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/* We need to do this after normalisation otherwise we can't get "24H" */
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if (one_backup.dst == 1 && two_backup.dst == 0 && two->sse >= one->sse + 86400) {
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if (two->sse < one->sse + 86400 - dst_corr) {
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rt->d--;
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rt->h = 24;
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} else {
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rt->h += dst_h_corr;
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rt->i += dst_m_corr;
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}
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}
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/* Restore old TZ info */
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memcpy(one, &one_backup, sizeof(one_backup));
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memcpy(two, &two_backup, sizeof(two_backup));
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return rt;
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}
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timelib_time *timelib_add(timelib_time *old_time, timelib_rel_time *interval)
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{
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int bias = 1;
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timelib_time *t = timelib_time_clone(old_time);
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if (interval->have_weekday_relative || interval->have_special_relative) {
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memcpy(&t->relative, interval, sizeof(struct timelib_rel_time));
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} else {
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if (interval->invert) {
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bias = -1;
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}
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memset(&t->relative, 0, sizeof(struct timelib_rel_time));
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t->relative.y = interval->y * bias;
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t->relative.m = interval->m * bias;
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t->relative.d = interval->d * bias;
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t->relative.h = interval->h * bias;
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t->relative.i = interval->i * bias;
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t->relative.s = interval->s * bias;
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}
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t->have_relative = 1;
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t->sse_uptodate = 0;
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timelib_update_ts(t, NULL);
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// printf("%lld %lld %d\n", old_time->dst, t->dst, (t->sse - old_time->sse));
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/* Adjust for backwards DST changeover */
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if (old_time->dst == 1 && t->dst == 0 && !interval->y && !interval->m && !interval->d) {
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t->sse -= old_time->z;
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t->sse += t->z;
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}
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timelib_update_from_sse(t);
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t->have_relative = 0;
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return t;
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}
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timelib_time *timelib_sub(timelib_time *old_time, timelib_rel_time *interval)
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{
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int bias = 1;
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timelib_time *t = timelib_time_clone(old_time);
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if (interval->invert) {
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bias = -1;
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}
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memset(&t->relative, 0, sizeof(struct timelib_rel_time));
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t->relative.y = 0 - (interval->y * bias);
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t->relative.m = 0 - (interval->m * bias);
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t->relative.d = 0 - (interval->d * bias);
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t->relative.h = 0 - (interval->h * bias);
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t->relative.i = 0 - (interval->i * bias);
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t->relative.s = 0 - (interval->s * bias);
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t->have_relative = 1;
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t->sse_uptodate = 0;
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timelib_update_ts(t, NULL);
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/* Adjust for backwards DST changeover */
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if (old_time->dst == 1 && t->dst == 0 && !interval->y && !interval->m && !interval->d) {
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t->sse -= old_time->z;
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t->sse += t->z;
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}
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/* Adjust for forwards DST changeover */
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if (old_time->dst == 0 && t->dst == 1 && !interval->y && !interval->m && !interval->d ) {
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t->sse -= old_time->z;
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t->sse += t->z;
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}
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timelib_update_from_sse(t);
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t->have_relative = 0;
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return t;
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}
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