X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Frtc%2Frtc-lib.c;fp=drivers%2Frtc%2Frtc-lib.c;h=9812120f3a7c825c783a7c15635279740ced383d;hb=16c70f8c1b54b61c3b951b6fb220df250fe09b32;hp=cfedc1d28ee1ab80529a86afff78c3a171d3a357;hpb=4e76c8a9fa413ccc09d3f7f664183dcce3555d57;p=linux-2.6.git

diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c
index cfedc1d28..9812120f3 100644
--- a/drivers/rtc/rtc-lib.c
+++ b/drivers/rtc/rtc-lib.c
@@ -18,15 +18,34 @@ static const unsigned char rtc_days_in_month[] = {
 	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
 };
 
+static const unsigned short rtc_ydays[2][13] = {
+	/* Normal years */
+	{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
+	/* Leap years */
+	{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
+};
+
 #define LEAPS_THRU_END_OF(y) ((y)/4 - (y)/100 + (y)/400)
 #define LEAP_YEAR(year) ((!(year % 4) && (year % 100)) || !(year % 400))
 
+/*
+ * The number of days in the month.
+ */
 int rtc_month_days(unsigned int month, unsigned int year)
 {
 	return rtc_days_in_month[month] + (LEAP_YEAR(year) && month == 1);
 }
 EXPORT_SYMBOL(rtc_month_days);
 
+/*
+ * The number of days since January 1. (0 to 365)
+ */
+int rtc_year_days(unsigned int day, unsigned int month, unsigned int year)
+{
+	return rtc_ydays[LEAP_YEAR(year)][month] + day-1;
+}
+EXPORT_SYMBOL(rtc_year_days);
+
 /*
  * Convert seconds since 01-01-1970 00:00:00 to Gregorian date.
  */