ulib Time utilities, expose time() syscall

ulib/time/time.c

@@ -0,0 +1,31 @@
+#include <stdbool.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <sysdefs/time.h>
+
+bool time_isleap(uint32_t y) {
+  return ((y % 4 == 0) && (y % 100 != 0) || (y % 400 == 0));
+}
+
+const uint16_t days_before_month[12] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
+
+timeunix_t time_tounix(Time *time) {
+  uint64_t days = 0;
+  for (uint32_t y = 1970; y < time->year; y++) {
+    days += time_isleap(y) ? 366 : 365;
+  }
+
+  days += days_before_month[time->month - 1];
+
+  if (time->month > 2 && time_isleap(time->year)) {
+    days += 1;
+  }
+
+  days += time->day - 1;
+
+  uint64_t secs = days * 86400;
+  secs += time->hour * 3600;
+  secs += time->minute * 60;
+  secs += time->second;
+  return secs;
+}

ulib/time/time.h

@@ -0,0 +1,8 @@
+#ifndef ULIB_TIME_TIME_H_
+#define ULIB_TIME_TIME_H_
+
+#include <sysdefs/time.h>
+
+timeunix_t time_tounix(Time *time);
+
+#endif // ULIB_TIME_TIME_H_