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Annotation of embedaddon/php/ext/date/lib/interval.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:    +----------------------------------------------------------------------+
                      3:    | PHP Version 5                                                        |
                      4:    +----------------------------------------------------------------------+
                      5:    | Copyright (c) 1997-2010 The PHP Group                                |
                      6:    +----------------------------------------------------------------------+
                      7:    | This source file is subject to version 3.01 of the PHP license,      |
                      8:    | that is bundled with this package in the file LICENSE, and is        |
                      9:    | available through the world-wide-web at the following url:           |
                     10:    | http://www.php.net/license/3_01.txt                                  |
                     11:    | If you did not receive a copy of the PHP license and are unable to   |
                     12:    | obtain it through the world-wide-web, please send a note to          |
                     13:    | license@php.net so we can mail you a copy immediately.               |
                     14:    +----------------------------------------------------------------------+
                     15:    | Authors: Derick Rethans <derick@derickrethans.nl>                    |
                     16:    +----------------------------------------------------------------------+
                     17:  */
                     18: 
                     19: /* $Id: interval.c 320563 2011-12-07 08:39:43Z pajoye $ */
                     20: 
                     21: #include "timelib.h"
                     22: #include <math.h>
                     23: 
                     24: timelib_rel_time *timelib_diff(timelib_time *one, timelib_time *two)
                     25: {
                     26:        timelib_rel_time *rt;
                     27:        timelib_time *swp;
                     28:        timelib_sll dst_h_corr = 0, dst_m_corr = 0;
                     29:        timelib_time one_backup, two_backup;
                     30: 
                     31:        rt = timelib_rel_time_ctor();
                     32:        rt->invert = 0;
                     33:        if (one->sse > two->sse) {
                     34:                swp = two;
                     35:                two = one;
                     36:                one = swp;
                     37:                rt->invert = 1;
                     38:        }
                     39: 
                     40:        /* Calculate correction for DST change over, but only if the TZ type is ID
                     41:         * and it's the same */
                     42:        if (one->zone_type == 3 && two->zone_type == 3
                     43:                && (strcmp(one->tz_info->name, two->tz_info->name) == 0)
                     44:                && (one->z != two->z))
                     45:        {
                     46:                dst_h_corr = (two->z - one->z) / 3600;
                     47:                dst_m_corr = ((two->z - one->z) % 3600) / 60;
                     48:        }
                     49: 
                     50:        /* Save old TZ info */
                     51:        memcpy(&one_backup, one, sizeof(one_backup));
                     52:        memcpy(&two_backup, two, sizeof(two_backup));
                     53: 
                     54:     timelib_apply_localtime(one, 0);
                     55:     timelib_apply_localtime(two, 0);
                     56: 
                     57:        rt->y = two->y - one->y;
                     58:        rt->m = two->m - one->m;
                     59:        rt->d = two->d - one->d;
                     60:        rt->h = two->h - one->h + dst_h_corr;
                     61:        rt->i = two->i - one->i + dst_m_corr;
                     62:        rt->s = two->s - one->s;
                     63:        rt->days = abs(floor((one->sse - two->sse - (dst_h_corr * 3600) - (dst_m_corr * 60)) / 86400));
                     64: 
                     65:        timelib_do_rel_normalize(rt->invert ? one : two, rt);
                     66: 
                     67:        /* Restore old TZ info */
                     68:        memcpy(one, &one_backup, sizeof(one_backup));
                     69:        memcpy(two, &two_backup, sizeof(two_backup));
                     70: 
                     71:        return rt;
                     72: }