From e63b2f75607905fedf00cfd9fe644b26af715ffd Mon Sep 17 00:00:00 2001
From: Leo C
Date: Mon, 1 Dec 2014 23:25:55 +0100
Subject: switch to avr-libc 1.8.1 time library

---
 time/week_of_month.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 time/week_of_month.c

(limited to 'time/week_of_month.c')

diff --git a/time/week_of_month.c b/time/week_of_month.c
new file mode 100644
index 0000000..6eca94f
--- /dev/null
+++ b/time/week_of_month.c
@@ -0,0 +1,62 @@
+/*
+ * (c)2012 Michael Duane Rice All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer. 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. Neither the name of the copyright holders
+ * nor the names of contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER 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.
+ */
+
+/* $Id: week_of_month.c 2362 2013-04-26 22:22:46Z swfltek $ */
+
+/*
+	Return the week of month, where 'base' represents the starting day.
+	In the USA, the week is generally considered to start on Sunday (base = 0),
+	while in Europe it is generally considered to be Monday (base = 1).
+
+	Return value ranges from 0 to 5.
+*/
+
+#include <time.h>
+
+uint8_t
+week_of_month(const struct tm * timestruct, uint8_t base)
+{
+	int             first, n;
+
+	/* zero base the day of month */
+	n = timestruct->tm_mday - 1;
+
+	/* find the first base day of the month (start of week 1) */
+	first = 7 + n - timestruct->tm_wday + base;
+	first %= 7;
+
+	/* find days since the first week began */
+	n = n - first;
+
+	/* if negative, we are in week 0 */
+	if (n < 0)
+		return 0;
+
+	return n / 7 + 1;
+
+}
-- 
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