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This allows us to make all comparision operators on the class constexpr without pulling in a bunch of boilerplate. We don't use the `<compare>` header because it doesn't compile in the main serenity cross-build due to the include paths to LibC being incompatible with how libc++ expects them to be for clang builds.
314 lines
9.4 KiB
C++
314 lines
9.4 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Checked.h>
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#include <AK/Time.h>
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// Make a reasonable guess as to which timespec/timeval definition to use.
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// It doesn't really matter, since both are identical.
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#ifdef KERNEL
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# include <Kernel/UnixTypes.h>
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#else
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# include <sys/time.h>
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# include <time.h>
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#endif
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namespace AK {
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int days_in_month(int year, unsigned month)
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{
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VERIFY(month >= 1 && month <= 12);
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if (month == 2)
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return is_leap_year(year) ? 29 : 28;
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bool is_long_month = (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12);
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return is_long_month ? 31 : 30;
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}
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unsigned day_of_week(int year, unsigned month, int day)
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{
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VERIFY(month >= 1 && month <= 12);
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constexpr Array seek_table = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 };
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if (month < 3)
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--year;
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return (year + year / 4 - year / 100 + year / 400 + seek_table[month - 1] + day) % 7;
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}
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Time Time::from_ticks(clock_t ticks, time_t ticks_per_second)
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{
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auto secs = ticks % ticks_per_second;
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i32 nsecs = 1'000'000'000 * (ticks - (ticks_per_second * secs)) / ticks_per_second;
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i32 extra_secs = sane_mod(nsecs, 1'000'000'000);
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return Time::from_half_sanitized(secs, extra_secs, nsecs);
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}
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Time Time::from_timespec(const struct timespec& ts)
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{
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i32 nsecs = ts.tv_nsec;
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i32 extra_secs = sane_mod(nsecs, 1'000'000'000);
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return Time::from_half_sanitized(ts.tv_sec, extra_secs, nsecs);
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}
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Time Time::from_timeval(const struct timeval& tv)
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{
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i32 usecs = tv.tv_usec;
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i32 extra_secs = sane_mod(usecs, 1'000'000);
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VERIFY(0 <= usecs && usecs < 1'000'000);
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return Time::from_half_sanitized(tv.tv_sec, extra_secs, usecs * 1'000);
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}
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i64 Time::to_truncated_seconds() const
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{
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VERIFY(m_nanoseconds < 1'000'000'000);
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if (m_seconds < 0 && m_nanoseconds) {
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// Since m_seconds is negative, adding 1 can't possibly overflow
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return m_seconds + 1;
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}
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return m_seconds;
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}
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i64 Time::to_truncated_milliseconds() const
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{
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VERIFY(m_nanoseconds < 1'000'000'000);
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Checked<i64> milliseconds((m_seconds < 0) ? m_seconds + 1 : m_seconds);
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milliseconds *= 1'000;
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milliseconds += m_nanoseconds / 1'000'000;
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if (m_seconds < 0) {
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if (m_nanoseconds % 1'000'000 != 0) {
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// Does not overflow: milliseconds <= 1'999.
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milliseconds++;
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}
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// We dropped one second previously, put it back in now that we have handled the rounding.
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milliseconds -= 1'000;
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}
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if (!milliseconds.has_overflow())
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return milliseconds.value();
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return m_seconds < 0 ? -0x8000'0000'0000'0000LL : 0x7fff'ffff'ffff'ffffLL;
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}
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i64 Time::to_truncated_microseconds() const
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{
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VERIFY(m_nanoseconds < 1'000'000'000);
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Checked<i64> microseconds((m_seconds < 0) ? m_seconds + 1 : m_seconds);
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microseconds *= 1'000'000;
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microseconds += m_nanoseconds / 1'000;
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if (m_seconds < 0) {
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if (m_nanoseconds % 1'000 != 0) {
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// Does not overflow: microseconds <= 1'999'999.
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microseconds++;
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}
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// We dropped one second previously, put it back in now that we have handled the rounding.
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microseconds -= 1'000'000;
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}
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if (!microseconds.has_overflow())
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return microseconds.value();
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return m_seconds < 0 ? -0x8000'0000'0000'0000LL : 0x7fff'ffff'ffff'ffffLL;
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}
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i64 Time::to_seconds() const
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{
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VERIFY(m_nanoseconds < 1'000'000'000);
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if (m_seconds >= 0 && m_nanoseconds) {
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Checked<i64> seconds(m_seconds);
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seconds++;
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return seconds.has_overflow() ? 0x7fff'ffff'ffff'ffffLL : seconds.value();
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}
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return m_seconds;
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}
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i64 Time::to_milliseconds() const
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{
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VERIFY(m_nanoseconds < 1'000'000'000);
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Checked<i64> milliseconds((m_seconds < 0) ? m_seconds + 1 : m_seconds);
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milliseconds *= 1'000;
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milliseconds += m_nanoseconds / 1'000'000;
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if (m_seconds >= 0 && m_nanoseconds % 1'000'000 != 0)
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milliseconds++;
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if (m_seconds < 0) {
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// We dropped one second previously, put it back in now that we have handled the rounding.
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milliseconds -= 1'000;
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}
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if (!milliseconds.has_overflow())
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return milliseconds.value();
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return m_seconds < 0 ? -0x8000'0000'0000'0000LL : 0x7fff'ffff'ffff'ffffLL;
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}
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i64 Time::to_microseconds() const
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{
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VERIFY(m_nanoseconds < 1'000'000'000);
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Checked<i64> microseconds((m_seconds < 0) ? m_seconds + 1 : m_seconds);
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microseconds *= 1'000'000;
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microseconds += m_nanoseconds / 1'000;
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if (m_seconds >= 0 && m_nanoseconds % 1'000 != 0)
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microseconds++;
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if (m_seconds < 0) {
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// We dropped one second previously, put it back in now that we have handled the rounding.
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microseconds -= 1'000'000;
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}
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if (!microseconds.has_overflow())
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return microseconds.value();
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return m_seconds < 0 ? -0x8000'0000'0000'0000LL : 0x7fff'ffff'ffff'ffffLL;
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}
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i64 Time::to_nanoseconds() const
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{
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VERIFY(m_nanoseconds < 1'000'000'000);
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Checked<i64> nanoseconds((m_seconds < 0) ? m_seconds + 1 : m_seconds);
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nanoseconds *= 1'000'000'000;
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nanoseconds += m_nanoseconds;
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if (m_seconds < 0) {
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// We dropped one second previously, put it back in now that we have handled the rounding.
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nanoseconds -= 1'000'000'000;
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}
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if (!nanoseconds.has_overflow())
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return nanoseconds.value();
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return m_seconds < 0 ? -0x8000'0000'0000'0000LL : 0x7fff'ffff'ffff'ffffLL;
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}
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timespec Time::to_timespec() const
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{
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VERIFY(m_nanoseconds < 1'000'000'000);
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return { static_cast<time_t>(m_seconds), static_cast<long>(m_nanoseconds) };
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}
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timeval Time::to_timeval() const
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{
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VERIFY(m_nanoseconds < 1'000'000'000);
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// This is done because winsock defines tv_sec and tv_usec as long, and Linux64 as long int.
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using sec_type = decltype(declval<timeval>().tv_sec);
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using usec_type = decltype(declval<timeval>().tv_usec);
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return { static_cast<sec_type>(m_seconds), static_cast<usec_type>(m_nanoseconds) / 1000 };
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}
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Time Time::operator+(Time const& other) const
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{
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VERIFY(m_nanoseconds < 1'000'000'000);
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VERIFY(other.m_nanoseconds < 1'000'000'000);
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u32 new_nsecs = m_nanoseconds + other.m_nanoseconds;
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u32 extra_secs = new_nsecs / 1'000'000'000;
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new_nsecs %= 1'000'000'000;
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i64 this_secs = m_seconds;
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i64 other_secs = other.m_seconds;
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// We would like to just add "this_secs + other_secs + extra_secs".
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// However, computing this naively may overflow even though the result is in-bounds.
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// Example in 8-bit: (-127) + (-2) + (+1) = (-128), which fits in an i8.
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// Example in 8-bit, the other way around: (-2) + (127) + (+1) = 126.
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// So we do something more sophisticated:
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if (extra_secs) {
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VERIFY(extra_secs == 1);
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if (this_secs != 0x7fff'ffff'ffff'ffff) {
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this_secs += 1;
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} else if (other_secs != 0x7fff'ffff'ffff'ffff) {
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other_secs += 1;
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} else {
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/* If *both* are INT64_MAX, then adding them will overflow in any case. */
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return Time::max();
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}
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}
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Checked<i64> new_secs { this_secs };
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new_secs += other_secs;
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if (new_secs.has_overflow()) {
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if (other_secs > 0)
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return Time::max();
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else
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return Time::min();
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}
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return Time { new_secs.value(), new_nsecs };
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}
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Time& Time::operator+=(Time const& other)
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{
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*this = *this + other;
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return *this;
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}
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Time Time::operator-(Time const& other) const
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{
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VERIFY(m_nanoseconds < 1'000'000'000);
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VERIFY(other.m_nanoseconds < 1'000'000'000);
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if (other.m_nanoseconds)
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return *this + Time((i64) ~(u64)other.m_seconds, 1'000'000'000 - other.m_nanoseconds);
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if (other.m_seconds != (i64)-0x8000'0000'0000'0000)
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return *this + Time(-other.m_seconds, 0);
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// Only remaining case: We want to subtract -0x8000'0000'0000'0000 seconds,
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// i.e. add a very large number.
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if (m_seconds >= 0)
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return Time::max();
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return Time { (m_seconds + 0x4000'0000'0000'0000) + 0x4000'0000'0000'0000, m_nanoseconds };
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}
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Time& Time::operator-=(Time const& other)
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{
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*this = *this - other;
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return *this;
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}
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Time Time::from_half_sanitized(i64 seconds, i32 extra_seconds, u32 nanoseconds)
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{
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VERIFY(nanoseconds < 1'000'000'000);
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if ((seconds <= 0 && extra_seconds > 0) || (seconds >= 0 && extra_seconds < 0)) {
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// Opposite signs mean that we can definitely add them together without fear of overflowing i64:
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seconds += extra_seconds;
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extra_seconds = 0;
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}
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// Now the only possible way to become invalid is overflowing i64 towards positive infinity:
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if (Checked<i64>::addition_would_overflow<i64, i64>(seconds, extra_seconds)) {
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if (seconds < 0) {
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return Time::min();
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} else {
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return Time::max();
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}
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}
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return Time { seconds + extra_seconds, nanoseconds };
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}
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#ifndef KERNEL
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namespace {
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static Time now_time_from_clock(clockid_t clock_id)
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{
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timespec now_spec {};
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::clock_gettime(clock_id, &now_spec);
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return Time::from_timespec(now_spec);
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}
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}
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Time Time::now_realtime()
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{
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return now_time_from_clock(CLOCK_REALTIME);
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}
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Time Time::now_realtime_coarse()
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{
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return now_time_from_clock(CLOCK_REALTIME_COARSE);
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}
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Time Time::now_monotonic()
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{
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return now_time_from_clock(CLOCK_MONOTONIC);
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}
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Time Time::now_monotonic_coarse()
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{
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return now_time_from_clock(CLOCK_MONOTONIC_COARSE);
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}
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#endif
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}
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