From 6f1b50a4cc6c232ee505a543f006abb1c6cd33cf Mon Sep 17 00:00:00 2001
From: Benji Dial <benji6283@gmail.com>
Date: Fri, 19 Feb 2021 23:41:56 -0500
Subject: rtc fixes, time command

---
 src/user/include/knob/time.h | 13 ++++++++++
 src/user/knob/time.c         | 57 ++++++++++++++++++++++++++++++++++++++++++++
 src/user/time/time.c         | 24 +++++++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 src/user/include/knob/time.h
 create mode 100644 src/user/knob/time.c
 create mode 100644 src/user/time/time.c

(limited to 'src/user')

diff --git a/src/user/include/knob/time.h b/src/user/include/knob/time.h
new file mode 100644
index 0000000..4b84697
--- /dev/null
+++ b/src/user/include/knob/time.h
@@ -0,0 +1,13 @@
+#include <stdint.h>
+
+struct time {
+  uint16_t year;//ad
+  uint8_t month;//jan = 1
+  uint8_t day;
+  uint8_t hour;//24-hour, midnight = 0
+  uint8_t minute;
+  uint8_t second;
+  uint32_t timestamp;
+};
+
+struct time get_time();
\ No newline at end of file
diff --git a/src/user/knob/time.c b/src/user/knob/time.c
new file mode 100644
index 0000000..e3bbb08
--- /dev/null
+++ b/src/user/knob/time.c
@@ -0,0 +1,57 @@
+#include <pland/syscall.h>
+#include <knob/time.h>
+#include <stdint.h>
+
+uint8_t days_in_months[] = {
+  31,  0, 31, 30,
+  31, 30, 31, 31,
+  30, 31, 30, 31
+};
+
+struct time get_time() {
+  struct time t;
+
+  const uint32_t ts = _get_timestamp();
+  t.timestamp = ts;
+
+  const uint32_t time_part = ts % 86400;
+  t.hour = time_part / 3600;
+  t.minute = (time_part / 60) % 60;
+  t.second = time_part % 60;
+
+  uint32_t days = ts / 86400;
+
+  uint32_t year = 2000;
+  while (days >= 1461) {
+    year += 4;
+    days -= 1461;
+  }
+
+  days_in_months[1] = 28;
+  if (days >= 1096) {
+    t.year = year += 3;
+    days -= 1096;
+  }
+  else if (days >= 731) {
+    t.year = year += 2;
+    days -= 731;
+  }
+  else if (days >= 366) {
+    t.year = ++year;
+    days -= 366;
+  }
+  else {
+    t.year = year;
+    days_in_months[1] = 29;
+  }
+
+  uint8_t m = 0;
+  while (days >= days_in_months[m]) {
+    days -= days_in_months[m];
+    ++m;
+  }
+
+  t.month = m + 1;
+  t.day = days + 1;
+  return t;
+}
\ No newline at end of file
diff --git a/src/user/time/time.c b/src/user/time/time.c
new file mode 100644
index 0000000..49f6cf5
--- /dev/null
+++ b/src/user/time/time.c
@@ -0,0 +1,24 @@
+#include <libterm/terminal.h>
+#include <knob/time.h>
+
+static const char *const month_names[] = {
+  "January",
+  "February",
+  "March",
+  "April",
+  "May",
+  "June",
+  "July",
+  "August",
+  "September",
+  "October",
+  "November",
+  "December"
+};
+
+void main() {
+  const struct time t = get_time();
+  term_addf("TS: 0x%8h\n", t.timestamp);
+  term_addf("Date: %s %u, %u\n", month_names[t.month - 1], t.day, t.year);
+  term_addf("Time: %u:%2u:%2u\n", t.hour, t.minute, t.second);
+}
\ No newline at end of file
-- 
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