105 lines
2.2 KiB
C++
105 lines
2.2 KiB
C++
/*
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* \brief Time information
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* \author Josef Soentgen
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* \date 2019-04-09
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*/
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/*
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* Copyright (C) 2019 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _NOUX__TIME_INFO_H_
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#define _NOUX__TIME_INFO_H_
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/* Genode includes */
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#include <util/string.h>
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#include <util/xml_node.h>
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#include <rtc_session/connection.h>
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/* Noux includes */
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#include <noux_session/sysio.h>
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namespace Noux {
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class Time_info;
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using namespace Genode;
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}
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class Noux::Time_info : Noncopyable
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{
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private:
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Constructible<Rtc::Connection> _rtc { };
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Genode::int64_t _initial_time { 0 };
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static bool _leap(unsigned year)
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{
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return ((year % 4) == 0
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&& ((year % 100) != 0 || (year % 400) == 0));
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}
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/**
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* Convert RTC timestamp to UNIX epoch (UTC)
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*/
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static Genode::int64_t _convert(Rtc::Timestamp const &ts)
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{
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if (ts.year < 1970) { return 0; }
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/*
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* Seconds per year lookup table
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*/
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static constexpr unsigned _secs_per_year[2] = {
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365 * 86400, 366 * 86400,
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};
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/*
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* Seconds per month lookup table
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*/
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static constexpr unsigned _sec_per_month[13] = {
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0 * 86400,
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31 * 86400, 28 * 86400, 31 * 86400, 30 * 86400,
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31 * 86400, 30 * 86400, 31 * 86400, 31 * 86400,
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30 * 86400, 31 * 86400, 30 * 86400, 31 * 86400
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};
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Genode::int64_t time = 0;
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for (unsigned i = 1970; i < ts.year; i++) {
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/* abuse bool conversion for seconds look up */
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time += _secs_per_year[(int)_leap(i)];
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}
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for (unsigned i = 1; i < ts.month; i++) {
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time += _sec_per_month[i];
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}
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time += _leap(ts.year) * 86400LL;
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time += 86400LL * (ts.day-1);
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time += 3600LL * ts.hour;
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time += 60LL * ts.minute;
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time += ts.second;
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return time;
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}
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public:
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Time_info(Env &env, Xml_node config)
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{
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/* only try to establish the connection on demand */
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bool const rtc = config.attribute_value("rtc", false);
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if (!rtc) { return; }
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_rtc.construct(env);
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_initial_time = _convert(_rtc->current_time());
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}
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Genode::int64_t initial_time() const { return _initial_time; }
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};
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#endif /* _NOUX__TIME_INFO_H_ */
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