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dis-bench / src /php /php-src /ext /calendar /easter.c
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/*
+----------------------------------------------------------------------+
| Copyright (c) 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: |
| https://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: Shane Caraveo <shane@caraveo.com> |
| Colin Viebrock <colin@easydns.com> |
| Hartmut Holzgraefe <hholzgra@php.net> |
| Arne Perschke <a.perschke@hctec.net> |
+----------------------------------------------------------------------+
*/
#include "php.h"
#include "php_calendar.h"
#include "sdncal.h"
#include <time.h>
/**
* If `gm` is true this will return the timestamp at midnight on Easter of the given year. If it is false this
* will return the number of days Easter is after March 21st.
*/
static void _cal_easter(INTERNAL_FUNCTION_PARAMETERS, bool gm)
{
/* based on code by Simon Kershaw, <webmaster@ely.anglican.org> */
struct tm te;
zend_long year, golden, solar, lunar, pfm, dom, tmp, easter, result;
zend_long method = CAL_EASTER_DEFAULT;
const zend_long max_year = (zend_long)(ZEND_LONG_MAX / 5) * 4;
bool year_is_null = 1;
if (zend_parse_parameters(ZEND_NUM_ARGS(),
"|l!l", &year, &year_is_null, &method) == FAILURE) {
RETURN_THROWS();
}
/* Default to the current year if year parameter is not given */
if (year_is_null) {
time_t a;
struct tm b, *res;
time(&a);
res = php_localtime_r(&a, &b);
if (!res) {
year = 1900;
} else {
year = 1900 + b.tm_year;
}
}
if (year <= 0 || year > max_year) {
zend_argument_value_error(1, "must be between 1 and " ZEND_LONG_FMT, max_year);
RETURN_THROWS();
}
#ifdef ZEND_ENABLE_ZVAL_LONG64
/* Compiling for 64bit, allow years between 1970 and 2.000.000.000 */
if (gm && year < 1970) {
/* timestamps only start after 1970 */
zend_argument_value_error(1, "must be a year after 1970 (inclusive)");
RETURN_THROWS();
}
if (gm && year > 2000000000) {
/* timestamps only go up to the year 2.000.000.000 */
zend_argument_value_error(1, "must be a year before 2.000.000.000 (inclusive)");
RETURN_THROWS();
}
#else
/* Compiling for 32bit, allow years between 1970 and 2037 */
if (gm && (year < 1970 || year > 2037)) {
zend_argument_value_error(1, "must be between 1970 and 2037 (inclusive)");
RETURN_THROWS();
}
#endif
golden = (year % 19) + 1; /* the Golden number */
if ((year <= 1582 && method != CAL_EASTER_ALWAYS_GREGORIAN) ||
(year >= 1583 && year <= 1752 && method != CAL_EASTER_ROMAN && method != CAL_EASTER_ALWAYS_GREGORIAN) ||
method == CAL_EASTER_ALWAYS_JULIAN) { /* JULIAN CALENDAR */
dom = (year + (year/4) + 5) % 7; /* the "Dominical number" - finding a Sunday */
if (dom < 0) {
dom += 7;
}
pfm = (3 - (11*golden) - 7) % 30; /* uncorrected date of the Paschal full moon */
if (pfm < 0) {
pfm += 30;
}
} else { /* GREGORIAN CALENDAR */
dom = (year + (year/4) - (year/100) + (year/400)) % 7; /* the "Domincal number" */
if (dom < 0) {
dom += 7;
}
solar = (year-1600)/100 - (year-1600)/400; /* the solar and lunar corrections */
lunar = (((year-1400) / 100) * 8) / 25;
pfm = (3 - (11*golden) + solar - lunar) % 30; /* uncorrected date of the Paschal full moon */
if (pfm < 0) {
pfm += 30;
}
}
if ((pfm == 29) || (pfm == 28 && golden > 11)) { /* corrected date of the Paschal full moon */
pfm--; /* - days after 21st March */
}
tmp = (4-pfm-dom) % 7;
if (tmp < 0) {
tmp += 7;
}
easter = pfm + tmp + 1; /* Easter as the number of days after 21st March */
if (gm) { /* return a timestamp */
te.tm_isdst = -1;
te.tm_year = year-1900;
te.tm_sec = 0;
te.tm_min = 0;
te.tm_hour = 0;
if (easter < 11) {
te.tm_mon = 2; /* March */
te.tm_mday = easter+21;
} else {
te.tm_mon = 3; /* April */
te.tm_mday = easter-10;
}
result = mktime(&te);
} else { /* return the days after March 21 */
result = easter;
}
ZVAL_LONG(return_value, result);
}
/* {{{ Return the timestamp of midnight on Easter of a given year (defaults to current year) */
PHP_FUNCTION(easter_date)
{
_cal_easter(INTERNAL_FUNCTION_PARAM_PASSTHRU, true);
}
/* }}} */
/* {{{ Return the number of days after March 21 that Easter falls on for a given year (defaults to current year) */
PHP_FUNCTION(easter_days)
{
_cal_easter(INTERNAL_FUNCTION_PARAM_PASSTHRU, false);
}
/* }}} */