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AK: Implement C++ 'Time' type for easier time-calculations

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This adds a bunch of code in the hope that other, wrong code can be deleted.

Related to #5315.
This commit is contained in:
Ben Wiederhake 2021-02-14 18:01:12 +01:00 • committed by Andreas Kling
parent b374dd03bd
commit bd6be910e5
4 changed files with 386 additions and 0 deletions
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47
AK/Time.h
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@ -27,6 +27,12 @@
#pragma once
#include <AK/Platform.h>
#include <AK/Types.h>
// Kernel and Userspace pull in the definitions from different places.
// Avoid trying to figure out which one.
struct timeval;
struct timespec;
namespace AK {
@ -66,6 +72,46 @@ inline int years_to_days_since_epoch(int year)
return days;
}
/*
* Represents a time amount in a "safe" way.
* Minimum: 0 seconds, 0 nanoseconds
* Maximum: 2**63-1 seconds, 999'999'999 nanoseconds
* If any operation (e.g. 'from_timeval' or operator-) would over- or underflow, the closest legal value is returned instead.
* Inputs (e.g. to 'from_timespec') are allowed to be in non-normal form (e.g. "1 second, 2'012'345'678 nanoseconds" or "1 second, -2 microseconds").
* Outputs (e.g. from 'to_timeval') are always in normal form.
*/
class Time {
public:
Time(const Time&) = default;
static Time from_seconds(i64 seconds) { return Time(seconds, 0); };
static Time from_timespec(const struct timespec&);
static Time from_timeval(const struct timeval&);
static Time min() { return Time(-0x8000'0000'0000'0000LL, 0); };
static Time zero() { return Time(0, 0); };
static Time max() { return Time(0x7fff'ffff'ffff'ffffLL, 999'999'999); };
timespec to_timespec() const;
timeval to_timeval() const;
bool operator==(const Time& other) const { return this->m_seconds == other.m_seconds && this->m_nanoseconds == other.m_nanoseconds; }
bool operator!=(const Time& other) const { return !(*this == other); }
Time operator+(const Time& other) const;
Time operator-(const Time& other) const;
private:
explicit Time(i64 seconds, u32 nanoseconds)
: m_seconds(seconds)
, m_nanoseconds(nanoseconds)
{
}
static Time from_half_sanitized(i64 seconds, i32 extra_seconds, u32 nanoseconds);
i64 m_seconds;
u32 m_nanoseconds; // Always less than 1'000'000'000
};
template<typename TimevalType>
inline void timeval_sub(const TimevalType& a, const TimevalType& b, TimevalType& result)
{
@ -178,6 +224,7 @@ using AK::day_of_year;
using AK::days_in_month;
using AK::days_in_year;
using AK::is_leap_year;
using AK::Time;
using AK::timespec_add;
using AK::timespec_add_timeval;
using AK::timespec_sub;