easter.c

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/*
   +----------------------------------------------------------------------+
   | PHP HTML Embedded Scripting Language Version 3.0                     |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-9 PHP Development Team (See Credits file)         |
   +----------------------------------------------------------------------+
   | This program is free software; you can redistribute it and/or modify |
   | it under the terms of one of the following licenses:                 |
   |                                                                      |
   |  A) the GNU General Public License as published by the Free Software |
   |     Foundation; either version 2 of the License, or (at your option) |
   |     any later version.                                               |
   |                                                                      |
   |  B) the PHP License as published by the PHP Development Team and     |
   |     included in the distribution in the file: LICENSE                |
   |                                                                      |
   | This program is distributed in the hope that it will be useful,      |
   | but WITHOUT ANY WARRANTY; without even the implied warranty of       |
   | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        |
   | GNU General Public License for more details.                         |
   |                                                                      |
   | You should have received a copy of both licenses referred to here.   |
   | If you did not, or have any questions about PHP licensing, please    |
   | contact [e-mail].                                                |
   +----------------------------------------------------------------------+
   | Authors: Colin Viebrock <[e-mail]>                            |
   +----------------------------------------------------------------------+
 */

#include "sdncal.h"
#include <time.h>

static void _cal_easter(INTERNAL_FUNCTION_PARAMETERS, int gm)
{

	/* based on code by Simon Kershaw, <[e-mail]> */

	pval *year_arg;
	struct tm *ta, te;
	time_t the_time;
	int year, golden, solar, lunar, pfm, dom, tmp, easter;

	switch(ARG_COUNT(ht)) {
	case 0:
		the_time = time(NULL);
		ta = localtime(&the_time);
		year = ta->tm_year + 1900;
		break;
	case 1:
		if (getParameters(ht, 1, &year_arg) == FAILURE) {
			WRONG_PARAM_COUNT;
		}
		convert_to_long(year_arg);
		year = year_arg->value.lval;
		break;
	default:
		WRONG_PARAM_COUNT;
	}

	if (gm && (year<1970 || year>2037)) {				/* out of range for timestamps */
		php3_error(E_WARNING, "easter_date() is only valid for years between 1970 and 2037 inclusive");
		RETURN_FALSE;
	}

	golden = (year % 19) + 1;					/* the Golden number */

	if ( year <= 1752 ) {						/* 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;
		}

	        return_value->value.lval = mktime(&te);
	} else {							/* return the days after March 21 */	
	        return_value->value.lval = easter;
	}

        return_value->type = IS_LONG;

}

/* {{{ proto int easter_date([int year])
   Return the timestamp of midnight on Easter of a given year (defaults to current year) */
void cal_easter_date(INTERNAL_FUNCTION_PARAMETERS)
{
	_cal_easter(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */

/* {{{ proto int easter_days([int year])
   Return the number of days after March 21 that Easter falls on for a given year (defaults to current year) */
void cal_easter_days(INTERNAL_FUNCTION_PARAMETERS)
{
	_cal_easter(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 */