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AK: Implement AK::Time's seconds_since_epoch_to_year without LibM

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In order for this method to be used within LibC itself, avoid using the
floor() method from LibM, which is not available from within LibC. This
header similarly avoids other standard headers as well.
This commit is contained in:
Timothy Flynn 2022-01-20 13:54:25 -05:00 committed by Linus Groh
parent e986ce961a
commit b873a222d7
1 changed files with 10 additions and 2 deletions
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12
AK/Time.h
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@ -10,7 +10,6 @@
#include <AK/Assertions.h>
#include <AK/Platform.h>
#include <AK/Types.h>
#include <math.h>
// Kernel and Userspace pull in the definitions from different places.
// Avoid trying to figure out which one.
@ -83,8 +82,17 @@ constexpr i64 seconds_since_epoch_to_year(i64 seconds)
{
constexpr double seconds_per_year = 60.0 * 60.0 * 24.0 * 365.2425;
// NOTE: We are not using floor() from <math.h> to avoid LibC / DynamicLoader dependency issues.
auto round_down = [](double value) -> i64 {
auto as_i64 = static_cast<i64>(value);
if ((value == as_i64) || (as_i64 >= 0))
return as_i64;
return as_i64 - 1;
};
auto years_since_epoch = static_cast<double>(seconds) / seconds_per_year;
return 1970 + static_cast<i64>(floor(years_since_epoch));
return 1970 + round_down(years_since_epoch);
}
/*