mirror of
https://github.com/RGBCube/serenity
synced 2025-07-27 03:57:44 +00:00
LibC: Implement tzset with time zone awareness in accordance with POSIX
This commit is contained in:
parent
6095500263
commit
b1ea585149
2 changed files with 100 additions and 5 deletions
|
@ -11,7 +11,9 @@
|
|||
#include <LibTimeZone/TimeZone.h>
|
||||
#include <assert.h>
|
||||
#include <errno.h>
|
||||
#include <limits.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <sys/time.h>
|
||||
#include <sys/times.h>
|
||||
|
@ -358,15 +360,44 @@ long altzone;
|
|||
char* tzname[2];
|
||||
int daylight;
|
||||
|
||||
static char __tzname_standard[TZNAME_MAX];
|
||||
static char __tzname_daylight[TZNAME_MAX];
|
||||
constexpr const char* __utc = "UTC";
|
||||
|
||||
void tzset()
|
||||
{
|
||||
// FIXME: Here we pretend we are in UTC+0.
|
||||
timezone = 0;
|
||||
daylight = 0;
|
||||
tzname[0] = const_cast<char*>(__utc);
|
||||
tzname[1] = const_cast<char*>(__utc);
|
||||
// FIXME: Actually parse the TZ environment variable, described here:
|
||||
// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08
|
||||
StringView time_zone;
|
||||
|
||||
if (char* tz = getenv("TZ"); tz != nullptr)
|
||||
time_zone = tz;
|
||||
else
|
||||
time_zone = TimeZone::current_time_zone();
|
||||
|
||||
auto set_default_values = []() {
|
||||
timezone = 0;
|
||||
altzone = 0;
|
||||
daylight = 0;
|
||||
tzname[0] = const_cast<char*>(__utc);
|
||||
tzname[1] = const_cast<char*>(__utc);
|
||||
};
|
||||
|
||||
if (auto offsets = TimeZone::get_named_time_zone_offsets(time_zone, AK::Time::now_realtime()); offsets.has_value()) {
|
||||
if (!offsets->at(0).name.copy_characters_to_buffer(__tzname_standard, TZNAME_MAX))
|
||||
return set_default_values();
|
||||
if (!offsets->at(1).name.copy_characters_to_buffer(__tzname_daylight, TZNAME_MAX))
|
||||
return set_default_values();
|
||||
|
||||
// timezone and altzone are seconds west of UTC, i.e. the offsets are negated.
|
||||
timezone = -offsets->at(0).seconds;
|
||||
altzone = -offsets->at(1).seconds;
|
||||
daylight = timezone != altzone;
|
||||
tzname[0] = __tzname_standard;
|
||||
tzname[1] = __tzname_daylight;
|
||||
} else {
|
||||
set_default_values();
|
||||
}
|
||||
}
|
||||
|
||||
clock_t clock()
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue