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#pragma once |
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#include |
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#include |
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#include |
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namespace panda { namespace time { |
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using std::string_view; |
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struct Timezone { |
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private: |
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mutable size_t refcnt; |
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public: |
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struct Transition { |
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ptime_t start; // time of transition |
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ptime_t local_start; // local time of transition (epoch+offset). |
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ptime_t local_end; // local time of transition's end (next transition epoch + MY offset). |
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ptime_t local_lower; // local_start or prev transition's local_end |
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ptime_t local_upper; // local_start or prev transition's local_end |
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int32_t offset; // offset from non-leap GMT |
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int32_t gmt_offset; // offset from leap GMT |
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int32_t delta; // offset minus previous transition's offset |
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int32_t isdst; // is DST in effect after this transition |
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int32_t leap_corr; // summary leap seconds correction at the moment |
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int32_t leap_delta; // delta leap seconds correction (0 if it's just a transition, != 0 if it's a leap correction) |
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ptime_t leap_end; // end of leap period (not including last second) = start + leap_delta |
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ptime_t leap_lend; // local_start + 2*leap_delta |
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union { |
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char abbrev[ZONE_ABBR_MAX+1]; // transition (zone) abbreviation |
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int64_t n_abbrev; // abbrev as int64_t |
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}; |
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}; |
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struct Rule { |
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// rule for future (beyond transition list) dates and for abstract timezones |
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// http://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html |
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// -------------------------------------------------------------------------------------------- |
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// 1 Jan OUTER ZONE OUTER END INNER ZONE INNER END OUTER ZONE 31 Dec |
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// -------------------------------------------------------------------------------------------- |
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struct Zone { |
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enum class Switch { DATE, JDAY, DAY }; |
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union { |
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char abbrev[ZONE_ABBR_MAX+1]; // zone abbreviation |
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int64_t n_abbrev; // abbrev as int64_t |
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}; |
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int32_t offset; // offset from non-leap GMT |
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int32_t gmt_offset; // offset from leap GMT |
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int32_t isdst; // true if zone represents DST time |
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Switch type; // type of 'end' field |
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datetime end; // dynamic date when this zone ends (only if hasdst=1) |
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}; |
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uint32_t hasdst; // does this rule have DST switching |
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Zone outer; // always present |
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Zone inner; // only present if hasdst=1 |
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int32_t max_offset; // max(outer.offset, inner.offset) |
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int32_t delta; // inner.offset - outer.offset |
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}; |
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struct Leap { |
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ptime_t time; |
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uint32_t correction; |
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}; |
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string name; |
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Transition* trans; |
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uint32_t trans_cnt; |
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Transition ltrans; // trans[trans_cnt-1] |
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Leap* leaps; |
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uint32_t leaps_cnt; |
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Rule future; |
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mutable bool is_local; // if timezone is set as local at the moment |
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Timezone () : refcnt(1) {} |
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void retain () const { refcnt++; } |
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void release () const { if (--refcnt <= 0) delete this; } |
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void clear () { |
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delete[] this->trans; |
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if (this->leaps_cnt > 0) delete[] this->leaps; |
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} |
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~Timezone () { clear(); } |
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}; |
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void tzset (const string_view& zonename); |
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void tzset (const Timezone* tz = NULL); |
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const Timezone* tzget (const string_view& zonename); |
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const Timezone* tzlocal (); |
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const string& tzdir (); |
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bool tzdir (const string&); |
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const string& tzsysdir (); |
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}} |