From ed73a3274ca4bb3dec0cf067732bcdf4fe1a7d62 Mon Sep 17 00:00:00 2001
From: Frank Gevaerts <frank@gevaerts.be>
Date: Tue, 11 Aug 2009 17:54:47 +0000
Subject: Add support for setting the clock using a special SCSI command. This
 is the same method that itunes uses, and there are host-side tools for it
 (e.g. libgpod)

Flyspray: FS#10514
Author: Laurent Papier and myself



git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22255 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/common/timefuncs.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

(limited to 'firmware/common/timefuncs.c')

diff --git a/firmware/common/timefuncs.c b/firmware/common/timefuncs.c
index 6fdc0b7240..f5097c8e52 100644
--- a/firmware/common/timefuncs.c
+++ b/firmware/common/timefuncs.c
@@ -193,3 +193,42 @@ time_t mktime(struct tm *t)
     return(result);
 }
 #endif
+
+int day_of_week(int m, int d, int y)
+{
+        char mo[12] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 };
+
+        if(m == 0 || m == 1) y--;
+        return (d + mo[m] + y + y/4 - y/100 + y/400) % 7;
+}
+
+void yearday_to_daymonth(int yd, int y, int *d, int *m)
+{
+    short t[12] = { 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
+    int i;
+
+    if((y%4 == 0 && y%100 != 0) || y%400 == 0)
+    {
+        for(i=1;i<12;i++)
+            t[i]++;
+    }
+
+    yd++;
+    if(yd <= 31)
+    {
+        *d = yd;
+        *m = 0;
+    }
+    else
+    {
+        for(i=1;i<12;i++)
+        {
+            if(yd <= t[i])
+            {
+                *d = yd - t[i-1];
+                *m = i;
+                break;
+            }
+        }
+    }
+}
-- 
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