rtc fixes, time command

1 files changed, 57 insertions, 0 deletions

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