RTC: Add exported function rtc_year_days() to calculate the tm_yday
value.
Signed-off-by: Andrew Victor <[email protected]>
Signed-off-by: Alessandro Zummo <[email protected]>
diff -urN -x CVS linux-2.6.17-rc6/drivers/rtc/rtc-lib.c linux-2.6.17-rc/drivers/rtc/rtc-lib.c
--- linux-2.6.17-rc6/drivers/rtc/rtc-lib.c Tue Jun 6 10:28:05 2006
+++ linux-2.6.17-rc/drivers/rtc/rtc-lib.c Wed Jun 7 11:27:49 2006
@@ -18,15 +18,34 @@
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.
*/
diff -urN -x CVS linux-2.6.17-rc6/include/linux/rtc.h linux-2.6.17-rc/include/linux/rtc.h
--- linux-2.6.17-rc6/include/linux/rtc.h Tue Jun 6 10:28:30 2006
+++ linux-2.6.17-rc/include/linux/rtc.h Wed Jun 7 11:24:45 2006
@@ -102,6 +102,7 @@
#include <linux/interrupt.h>
extern int rtc_month_days(unsigned int month, unsigned int year);
+extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
extern int rtc_valid_tm(struct rtc_time *tm);
extern int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time);
extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm);
-
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