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142 lines
4.3 KiB
C
142 lines
4.3 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 5 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2004 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.0 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_0.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: Shane Caraveo <shane@caraveo.com> |
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| Colin Viebrock <colin@easydns.com> |
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| Hartmut Holzgraefe <hholzgra@php.net> |
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+----------------------------------------------------------------------+
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*/
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/* $Id: */
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#include "php.h"
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#include "php_calendar.h"
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#include "sdncal.h"
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#include <time.h>
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static void _cal_easter(INTERNAL_FUNCTION_PARAMETERS, int gm)
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{
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/* based on code by Simon Kershaw, <webmaster@ely.anglican.org> */
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struct tm te;
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long year, golden, solar, lunar, pfm, dom, tmp, easter;
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long method = CAL_EASTER_DEFAULT;
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/* Default to the current year if year parameter is not given */
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{
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time_t a;
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struct tm b;
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time(&a);
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php_localtime_r(&a, &b);
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year = 1900 + b.tm_year;
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}
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if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC,
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"|ll", &year, &method) == FAILURE) {
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return;
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}
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if (gm && (year<1970 || year>2037)) { /* out of range for timestamps */
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php_error_docref(NULL TSRMLS_CC, E_WARNING, "This function is only valid for years between 1970 and 2037 inclusive");
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RETURN_FALSE;
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}
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golden = (year % 19) + 1; /* the Golden number */
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if ((year <= 1582 && method != CAL_EASTER_ALWAYS_GREGORIAN) ||
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(year >= 1583 && year <= 1752 && method != CAL_EASTER_ROMAN && method != CAL_EASTER_ALWAYS_GREGORIAN) ||
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method == CAL_EASTER_ALWAYS_JULIAN) { /* JULIAN CALENDAR */
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dom = (year + (year/4) + 5) % 7; /* the "Dominical number" - finding a Sunday */
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if (dom < 0) {
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dom += 7;
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}
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pfm = (3 - (11*golden) - 7) % 30; /* uncorrected date of the Paschal full moon */
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if (pfm < 0) {
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pfm += 30;
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}
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} else { /* GREGORIAN CALENDAR */
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dom = (year + (year/4) - (year/100) + (year/400)) % 7; /* the "Domincal number" */
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if (dom < 0) {
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dom += 7;
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}
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solar = (year-1600)/100 - (year-1600)/400; /* the solar and lunar corrections */
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lunar = (((year-1400) / 100) * 8) / 25;
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pfm = (3 - (11*golden) + solar - lunar) % 30; /* uncorrected date of the Paschal full moon */
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if (pfm < 0) {
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pfm += 30;
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}
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}
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if ((pfm == 29) || (pfm == 28 && golden > 11)) { /* corrected date of the Paschal full moon */
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pfm--; /* - days after 21st March */
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}
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tmp = (4-pfm-dom) % 7;
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if (tmp < 0) {
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tmp += 7;
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}
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easter = pfm + tmp + 1; /* Easter as the number of days after 21st March */
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if (gm) { /* return a timestamp */
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te.tm_isdst = -1;
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te.tm_year = year-1900;
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te.tm_sec = 0;
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te.tm_min = 0;
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te.tm_hour = 0;
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if (easter < 11) {
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te.tm_mon = 2; /* March */
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te.tm_mday = easter+21;
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} else {
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te.tm_mon = 3; /* April */
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te.tm_mday = easter-10;
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}
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Z_LVAL_P(return_value) = mktime(&te);
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} else { /* return the days after March 21 */
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Z_LVAL_P(return_value) = easter;
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}
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Z_TYPE_P(return_value) = IS_LONG;
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}
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/* {{{ proto int easter_date([int year])
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Return the timestamp of midnight on Easter of a given year (defaults to current year) */
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PHP_FUNCTION(easter_date)
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{
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_cal_easter(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
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}
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/* }}} */
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/* {{{ proto int easter_days([int year, [int method]])
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Return the number of days after March 21 that Easter falls on for a given year (defaults to current year) */
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PHP_FUNCTION(easter_days)
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{
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_cal_easter(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
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}
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/* }}} */
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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*/
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