1 files changed, 93 insertions, 0 deletions
diff --git a/misc_cmds/calendar/paskha.c b/misc_cmds/calendar/paskha.c
new file mode 100644
index 0000000..8193fb3
--- /dev/null
+++ b/misc_cmds/calendar/paskha.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 1993-1996 by Andrey A. Chernov, Moscow, Russia.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/usr.bin/calendar/paskha.c,v 1.8 2007/05/07 11:18:30 dwmalone Exp $");
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include "calendar.h"
+
+#define PASKHA "paskha"
+#define PASKHALEN (sizeof(PASKHA) - 1)
+
+static int paskha (int);
+
+/* return year day for Orthodox Easter using Gauss formula */
+/* (old style result) */
+
+static int
+paskha(int R) /*year*/
+{
+	int a, b, c, d, e;
+	static int x = 15;
+	static int y = 6;
+
+	a = R % 19;
+	b = R % 4;
+	c = R % 7;
+	d = (19*a + x) % 30;
+	e = (2*b + 4*c + 6*d + y) % 7;
+	return (((cumdays[3] + 1) + 22) + (d + e));
+}
+
+/* return year day for Orthodox Easter depending days */
+
+int
+getpaskha(char *s, int year)
+{
+	int offset;
+
+	if (strncasecmp(s, PASKHA, PASKHALEN) == 0)
+	    s += PASKHALEN;
+	else if (   npaskha.name != NULL
+		 && strncasecmp(s, npaskha.name, npaskha.len) == 0
+		)
+	    s += npaskha.len;
+	else
+	    return 0;
+
+
+	/* Paskha+1  or Paskha-2
+	 *       ^            ^   */
+
+	switch(*s) {
+
+	case '-':
+	case '+':
+	    offset = atoi(s);
+	    break;
+
+	default:
+	    offset = 0;
+	    break;
+	}
+	    
+	return (paskha(year) + offset + 13/* new style */);
+}