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LibJS: Protect [TimeValue]FromTime from non-finite times

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Includes HourFromTime, MinFromTime, SecFromTime, msFromTime.
This commit is contained in:
Timothy Flynn 2022-01-16 01:15:46 -05:00 committed by Andreas Kling
parent 4848f587cd
commit efda1724e8
Notes: sideshowbarker 2024-07-17 20:47:27 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/efda1724e89
Pull-request: https://github.com/SerenityOS/serenity/pull/11930
Reviewed-by: https://github.com/linusg ✅
1 changed files with 15 additions and 0 deletions
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15
Userland/Libraries/LibJS/Runtime/Date.cpp
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@ -222,6 +222,9 @@ u8 month_from_time(double t)
// HourFromTime(t), https://tc39.es/ecma262/#eqn-HourFromTime
u8 hour_from_time(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 𝔽(floor(ℝ(t / msPerHour)) modulo HoursPerDay)
return static_cast<u8>(modulo(floor(t / Date::ms_per_hour), Date::hours_per_day));
}
@ -229,6 +232,9 @@ u8 hour_from_time(double t)
// MinFromTime(t), https://tc39.es/ecma262/#eqn-MinFromTime
u8 min_from_time(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 𝔽(floor(ℝ(t / msPerMinute)) modulo MinutesPerHour)
return static_cast<u8>(modulo(floor(t / Date::ms_per_minute), Date::minutes_per_hour));
}
@ -236,6 +242,9 @@ u8 min_from_time(double t)
// SecFromTime(t), https://tc39.es/ecma262/#eqn-SecFromTime
u8 sec_from_time(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 𝔽(floor(ℝ(t / msPerSecond)) modulo SecondsPerMinute)
return static_cast<u8>(modulo(floor(t / Date::ms_per_second), Date::seconds_per_minute));
}
@ -243,6 +252,9 @@ u8 sec_from_time(double t)
// msFromTime(t), https://tc39.es/ecma262/#eqn-msFromTime
u16 ms_from_time(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 𝔽(ℝ(t) modulo msPerSecond)
return static_cast<u16>(modulo(t, Date::ms_per_second));
}
@ -250,6 +262,9 @@ u16 ms_from_time(double t)
// 21.4.1.6 Week Day, https://tc39.es/ecma262/#sec-week-day
u8 week_day(double t)
{
if (!Value(t).is_finite_number())
return 0;
// 𝔽(ℝ(Day(t) + 4𝔽) modulo 7)
return static_cast<u8>(modulo(day(t) + 4, 7));
}