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authorBertrik Sikken <bertrik@sikken.nl>2012-03-08 21:21:31 +0100
committerRafaël Carré <rafael.carre@gmail.com>2012-03-11 22:10:54 +0100
commit727e8aa6817be8816bc32184f2e2eb36b90b4a9e (patch)
treea5e8f7c50ba68bdd4a6ca60c2bdfdbde6a6d6bfd /firmware/libc
parent3448f5b6ad25f59e01ece347cb06e09652915e30 (diff)
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Introduce gmtime.c and use it in the AS3514 RTC driver
Change-Id: I00a09ae28a68f8153fb8fa854fea741ddfb0bf09 Reviewed-on: http://gerrit.rockbox.org/175 Tested-by: Bertrik Sikken <bertrik@sikken.nl> Reviewed-by: Michael Sevakis <jethead71@rockbox.org> Reviewed-by: Rafaël Carré <rafael.carre@gmail.com>
Diffstat (limited to 'firmware/libc')
-rw-r--r--firmware/libc/gmtime.c112
-rw-r--r--firmware/libc/include/time.h2
2 files changed, 114 insertions, 0 deletions
diff --git a/firmware/libc/gmtime.c b/firmware/libc/gmtime.c
new file mode 100644
index 0000000000..23b9c7b247
--- /dev/null
+++ b/firmware/libc/gmtime.c
@@ -0,0 +1,112 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2012 by Bertrik Sikken
+ *
+ * Based on code from: rtc_as3514.c
+ * Copyright (C) 2007 by Barry Wardell
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <stdbool.h>
+#include "time.h"
+
+#define MINUTE_SECONDS 60
+#define HOUR_SECONDS 3600
+#define DAY_SECONDS 86400
+#define WEEK_SECONDS 604800
+#define YEAR_SECONDS 31536000
+#define LEAP_YEAR_SECONDS 31622400
+
+/* Days in each month */
+static int days_in_month[] =
+ {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+static inline bool is_leapyear(int year)
+{
+ return (((year%4)==0) && (((year%100)!=0) || ((year%400)==0)));
+}
+
+struct tm *gmtime(const time_t *timep)
+{
+ static struct tm time;
+ return gmtime_r(timep, &time);
+}
+
+struct tm *gmtime_r(const time_t *timep, struct tm *tm)
+{
+ time_t seconds = *timep;
+ int year, i, mday, hour, min;
+
+ /* weekday */
+ tm->tm_wday = ((seconds % WEEK_SECONDS) / DAY_SECONDS + 4) % 7;
+
+ /* Year */
+ year = 1970;
+ while (seconds >= LEAP_YEAR_SECONDS)
+ {
+ if (is_leapyear(year)){
+ seconds -= LEAP_YEAR_SECONDS;
+ } else {
+ seconds -= YEAR_SECONDS;
+ }
+
+ year++;
+ }
+
+ if (is_leapyear(year)) {
+ days_in_month[1] = 29;
+ } else {
+ days_in_month[1] = 28;
+ if(seconds>YEAR_SECONDS){
+ year++;
+ seconds -= YEAR_SECONDS;
+ }
+ }
+ tm->tm_year = year%100 + 100;
+
+ /* Month */
+ for (i = 0; i < 12; i++)
+ {
+ if (seconds < days_in_month[i]*DAY_SECONDS){
+ tm->tm_mon = i;
+ break;
+ }
+
+ seconds -= days_in_month[i]*DAY_SECONDS;
+ }
+
+ /* Month Day */
+ mday = seconds/DAY_SECONDS;
+ seconds -= mday*DAY_SECONDS;
+ tm->tm_mday = mday + 1; /* 1 ... 31 */
+
+ /* Hour */
+ hour = seconds/HOUR_SECONDS;
+ seconds -= hour*HOUR_SECONDS;
+ tm->tm_hour = hour;
+
+ /* Minute */
+ min = seconds/MINUTE_SECONDS;
+ seconds -= min*MINUTE_SECONDS;
+ tm->tm_min = min;
+
+ /* Second */
+ tm->tm_sec = seconds;
+
+ return tm;
+}
+
diff --git a/firmware/libc/include/time.h b/firmware/libc/include/time.h
index 912fafe7ca..4796b8b083 100644
--- a/firmware/libc/include/time.h
+++ b/firmware/libc/include/time.h
@@ -34,6 +34,8 @@ typedef long time_t;
#define _TIME_T_DECLARED
time_t time(time_t *t);
struct tm *localtime(const time_t *timep);
+struct tm *gmtime(const time_t *timep);
+struct tm *gmtime_r(const time_t *timep, struct tm *result);
time_t mktime(struct tm *t);
#endif /* SIMULATOR */