From e8f06b238898a9028d9d70e062e07f3746aae0de Mon Sep 17 00:00:00 2001
From: Stefan `Sec` Zehl <sec@42.org>
Date: Sat, 30 Jul 2011 15:25:14 +0200
Subject: [PATCH] Some time related functionality

---
 firmware/basic/Makefile     |  1 +
 firmware/basic/basic.h      |  4 ++++
 firmware/basic/simpletime.c | 46 +++++++++++++++++++++++++++++++++++++
 firmware/basic/simpletime.h | 16 +++++++++++++
 4 files changed, 67 insertions(+)
 create mode 100644 firmware/basic/simpletime.c
 create mode 100644 firmware/basic/simpletime.h

diff --git a/firmware/basic/Makefile b/firmware/basic/Makefile
index eb3b501..b5dcf51 100644
--- a/firmware/basic/Makefile
+++ b/firmware/basic/Makefile
@@ -20,6 +20,7 @@ OBJS += random.o
 OBJS += idle.o
 OBJS += config.o
 OBJS += itoa.o
+OBJS += simpletime.o
 
 LIBNAME=basic
 
diff --git a/firmware/basic/basic.h b/firmware/basic/basic.h
index d218cd6..aba4491 100644
--- a/firmware/basic/basic.h
+++ b/firmware/basic/basic.h
@@ -206,4 +206,8 @@ int applyConfig(void);
 // itoa.c
 const char* IntToStrX(unsigned int num, unsigned int mxlen);
 
+// simpletime.c
+
+#include "basic/simpletime.h"
+
 #endif
diff --git a/firmware/basic/simpletime.c b/firmware/basic/simpletime.c
new file mode 100644
index 0000000..a43d683
--- /dev/null
+++ b/firmware/basic/simpletime.c
@@ -0,0 +1,46 @@
+#include <sysinit.h>
+#include "simpletime.h"
+#include "basic/basic.h"
+
+time_t _timet=0;
+
+int _ytab[2][12] = {
+    { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
+    { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
+};
+
+struct tm * mygmtime(register const time_t time) {
+        static struct tm br_time;
+        register struct tm *timep = &br_time;
+        register unsigned long dayclock, dayno;
+        int year = EPOCH_YR;
+
+        dayclock = (unsigned long)time % SECS_DAY;
+        dayno = (unsigned long)time / SECS_DAY;
+
+        timep->tm_sec = dayclock % 60;
+        timep->tm_min = (dayclock % 3600) / 60;
+        timep->tm_hour = dayclock / 3600;
+        timep->tm_wday = (dayno + 4) % 7;       /* day 0 was a thursday */
+        while (dayno >= YEARSIZE(year)) {
+                dayno -= YEARSIZE(year);
+                year++;
+        }
+        timep->tm_year = year - YEAR0;
+        timep->tm_yday = dayno;
+        timep->tm_mon = 0;
+        while (dayno >= _ytab[LEAPYEAR(year)][timep->tm_mon]) {
+                dayno -= _ytab[LEAPYEAR(year)][timep->tm_mon];
+                timep->tm_mon++;
+        }
+        timep->tm_mday = dayno + 1;
+        timep->tm_isdst = 0;
+
+        return timep;
+}
+
+// Timezones suck. Currently we only do it all in localtime.
+// I know it's broken. Sorry
+time_t getSeconds(void){
+    return _timet+(getTimer()*SYSTICKSPEED/1000);
+};
diff --git a/firmware/basic/simpletime.h b/firmware/basic/simpletime.h
new file mode 100644
index 0000000..7efafe5
--- /dev/null
+++ b/firmware/basic/simpletime.h
@@ -0,0 +1,16 @@
+#ifndef __SIMPLETIME_H_
+#define __SIMPLETIME_H_
+
+#include <time.h>
+
+#define YEAR0           1900                    /* the first year */
+#define EPOCH_YR        1970            /* EPOCH = Jan 1 1970 00:00:00 */
+#define SECS_DAY        (24L * 60L * 60L)
+#define LEAPYEAR(year)  (!((year) % 4) && (((year) % 100) || !((year) % 400)))
+#define YEARSIZE(year)  (LEAPYEAR(year) ? 366 : 365)
+
+extern time_t _timet;
+struct tm * mygmtime(register const time_t time);
+time_t getSeconds(void);
+
+#endif