247caac7a8
If the tzname is unknown, fall back to UTC for now. Unknown time zones are most likely due to not parsing RULE entries yet, but at the very least, it only makes sense for current_time_zone to return a time zone that LibTimeZone actually knows about.
83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
/*
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* Copyright (c) 2022, Tim Flynn <trflynn89@pm.me>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTimeZone/TimeZone.h>
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#include <time.h>
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namespace TimeZone {
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// NOTE: Without ENABLE_TIME_ZONE_DATA LibTimeZone operates in a UTC-only mode and only recognizes
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// the 'UTC' time zone, which is slightly more useful than a bunch of dummy functions that
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// can't do anything. When we build with time zone data, these weakly linked functions are
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// replaced with their proper counterparts.
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#if !ENABLE_TIME_ZONE_DATA
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enum class TimeZone : u16 {
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UTC,
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};
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#endif
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StringView current_time_zone()
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{
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static bool initialized_time_zone = false;
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if (!initialized_time_zone) {
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initialized_time_zone = true;
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tzset();
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}
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return canonicalize_time_zone(tzname[0]).value_or("UTC"sv);
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}
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Optional<TimeZone> __attribute__((weak)) time_zone_from_string([[maybe_unused]] StringView time_zone)
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{
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#if !ENABLE_TIME_ZONE_DATA
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if (time_zone.equals_ignoring_case("UTC"sv))
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return TimeZone::UTC;
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#endif
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return {};
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}
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StringView __attribute__((weak)) time_zone_to_string([[maybe_unused]] TimeZone time_zone)
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{
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#if !ENABLE_TIME_ZONE_DATA
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VERIFY(time_zone == TimeZone::UTC);
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return "UTC"sv;
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#else
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return {};
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#endif
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}
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Optional<StringView> canonicalize_time_zone(StringView time_zone)
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{
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auto maybe_time_zone = time_zone_from_string(time_zone);
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if (!maybe_time_zone.has_value())
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return {};
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auto canonical_time_zone = time_zone_to_string(*maybe_time_zone);
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if (canonical_time_zone.is_one_of("Etc/UTC"sv, "Etc/GMT"sv))
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return "UTC"sv;
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return canonical_time_zone;
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}
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Optional<i64> __attribute__((weak)) get_time_zone_offset([[maybe_unused]] TimeZone time_zone, AK::Time)
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{
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#if !ENABLE_TIME_ZONE_DATA
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VERIFY(time_zone == TimeZone::UTC);
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return 0;
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#else
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return {};
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#endif
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}
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Optional<i64> get_time_zone_offset(StringView time_zone, AK::Time time)
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{
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if (auto maybe_time_zone = time_zone_from_string(time_zone); maybe_time_zone.has_value())
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return get_time_zone_offset(*maybe_time_zone, time);
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return {};
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}
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}
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