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111 lines
3.8 KiB
111 lines
3.8 KiB
#ifndef TZTIME_INCLUDED
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#define TZTIME_INCLUDED
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#include "my_config.h"
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/* Copyright (c) 2004, 2018, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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typedef long my_time_t;
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#if !defined(TESTTIME) && !defined(TZINFO2SQL)
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#include "my_inttypes.h"
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef _WIN32
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#include <winsock2.h>
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#endif
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#include "mysql_time.h" // MYSQL_TIME
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class String;
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class THD;
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/**
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This class represents abstract time zone and provides
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basic interface for MYSQL_TIME <-> my_time_t conversion.
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Actual time zones which are specified by DB, or via offset
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or use system functions are its descendants.
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*/
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class Time_zone {
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public:
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Time_zone() {} /* Remove gcc warning */
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/**
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Converts local time in broken down MYSQL_TIME representation to
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my_time_t (UTC seconds since Epoch) represenation.
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Returns 0 in case of error. Sets in_dst_time_gap to true if date provided
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falls into spring time-gap (or lefts it untouched otherwise).
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*/
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virtual my_time_t TIME_to_gmt_sec(const MYSQL_TIME *t,
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bool *in_dst_time_gap) const = 0;
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/**
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Converts time in my_time_t representation to local time in
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broken down MYSQL_TIME representation.
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*/
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virtual void gmt_sec_to_TIME(MYSQL_TIME *tmp, my_time_t t) const = 0;
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/**
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Comverts "struct timeval" to local time in
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broken down MYSQL_TIME represendation.
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*/
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void gmt_sec_to_TIME(MYSQL_TIME *tmp, struct timeval tv) {
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gmt_sec_to_TIME(tmp, (my_time_t)tv.tv_sec);
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tmp->second_part = tv.tv_usec;
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}
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/**
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Because of constness of String returned by get_name() time zone name
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have to be already zeroended to be able to use String::ptr() instead
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of c_ptr().
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*/
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virtual const String *get_name() const = 0;
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/**
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We need this only for surpressing warnings, objects of this type are
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allocated on MEM_ROOT and should not require destruction.
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*/
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virtual ~Time_zone() {}
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protected:
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static inline void adjust_leap_second(MYSQL_TIME *t);
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};
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extern Time_zone *my_tz_UTC;
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extern Time_zone *my_tz_SYSTEM;
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extern Time_zone *my_tz_OFFSET0;
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extern Time_zone *my_tz_find(THD *thd, const String *name);
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extern bool my_tz_init(THD *org_thd, const char *default_tzname,
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bool bootstrap);
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extern void my_tz_free();
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extern my_time_t sec_since_epoch_TIME(MYSQL_TIME *t);
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/**
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Number of elements in table list produced by my_tz_get_table_list()
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(this table list contains tables which are needed for dynamical loading
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of time zone descriptions). Actually it is imlementation detail that
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should not be used anywhere outside of tztime.h and tztime.cc.
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*/
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static const int MY_TZ_TABLES_COUNT = 4;
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#endif /* !defined(TESTTIME) && !defined(TZINFO2SQL) */
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#endif /* TZTIME_INCLUDED */
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