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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <cstdio>
#include "drizzled/tzfile.h"
#include "drizzled/tztime.h"
#include "drizzled/gettext.h"
#include "drizzled/session.h"
#include "drizzled/time_functions.h"
namespace drizzled
{
/**
* String with names of SYSTEM time zone.
*/
static const String tz_SYSTEM_name("SYSTEM", 6, &my_charset_utf8_general_ci);
/**
* Instance of this class represents local time zone used on this system
* (specified by TZ environment variable or via any other system mechanism).
* It uses system functions (localtime_r, my_system_gmt_sec) for conversion
* and is always available. Because of this it is used by default - if there
* were no explicit time zone specified. On the other hand because of this
* conversion methods provided by this class is significantly slower and
* possibly less multi-threaded-friendly than corresponding Time_zone_db
* methods so the latter should be preffered there it is possible.
*/
class Time_zone_system : public Time_zone
{
public:
Time_zone_system() {} /* Remove gcc warning */
virtual time_t TIME_to_gmt_sec(const DRIZZLE_TIME *t,
bool *in_dst_time_gap) const;
virtual void gmt_sec_to_TIME(DRIZZLE_TIME *tmp, time_t t) const;
virtual const String * get_name() const;
};
/**
* @brief
* Converts local time in system time zone in DRIZZLE_TIME representation
* to its time_t representation.
*
* @details
* This method uses system function (localtime_r()) for conversion
* local time in system time zone in DRIZZLE_TIME structure to its time_t
* representation. Unlike the same function for Time_zone_db class
* it it won't handle unnormalized input properly. Still it will
* return lowest possible time_t in case of ambiguity or if we
* provide time corresponding to the time-gap.
*
* You should call init_time() function before using this function.
*
* @param t pointer to DRIZZLE_TIME structure with local time in
* broken-down representation.
* @param in_dst_time_gap pointer to bool which is set to true if datetime
* value passed doesn't really exist (i.e. falls into
* spring time-gap) and is not touched otherwise.
*
* @return
* Corresponding time_t value or 0 in case of error
*/
time_t
Time_zone_system::TIME_to_gmt_sec(const DRIZZLE_TIME *t, bool *in_dst_time_gap) const
{
long not_used;
return my_system_gmt_sec(t, ¬_used, in_dst_time_gap);
}
/**
* @brief
* Converts time from UTC seconds since Epoch (time_t) representation
* to system local time zone broken-down representation.
*
* @param tmp pointer to DRIZZLE_TIME structure to fill-in
* @param t time_t value to be converted
*
* Note: We assume that value passed to this function will fit into time_t range
* supported by localtime_r. This conversion is putting restriction on
* TIMESTAMP range in MySQL. If we can get rid of SYSTEM time zone at least
* for interaction with client then we can extend TIMESTAMP range down to
* the 1902 easily.
*/
void
Time_zone_system::gmt_sec_to_TIME(DRIZZLE_TIME *tmp, time_t t) const
{
struct tm tmp_tm;
time_t tmp_t= (time_t)t;
localtime_r(&tmp_t, &tmp_tm);
localtime_to_TIME(tmp, &tmp_tm);
tmp->time_type= DRIZZLE_TIMESTAMP_DATETIME;
}
/**
* @brief
* Get name of time zone
*
* @return
* Name of time zone as String
*/
const String *
Time_zone_system::get_name() const
{
return &tz_SYSTEM_name;
}
static Time_zone_system tz_SYSTEM;
Time_zone *my_tz_SYSTEM= &tz_SYSTEM;
/**
* @brief
* Initialize time zone support infrastructure.
*
* @details
* This function will init memory structures needed for time zone support,
* it will register mandatory SYSTEM time zone in them. It will try to open
* mysql.time_zone* tables and load information about default time zone and
* information which further will be shared among all time zones loaded.
* If system tables with time zone descriptions don't exist it won't fail
* (unless default_tzname is time zone from tables). If bootstrap parameter
* is true then this routine assumes that we are in bootstrap mode and won't
* load time zone descriptions unless someone specifies default time zone
* which is supposedly stored in those tables.
* It'll also set default time zone if it is specified.
*
* @param session current thread object
* @param default_tzname default time zone or 0 if none.
* @param bootstrap indicates whenever we are in bootstrap mode
*
* @return
* 0 - ok
* 1 - Error
*/
bool
my_tz_init(Session *session, const char *default_tzname)
{
if (default_tzname)
{
String tmp_tzname2(default_tzname, &my_charset_utf8_general_ci);
/*
Time zone tables may be open here, and my_tz_find() may open
most of them once more, but this is OK for system tables open
for READ.
*/
if (!(global_system_variables.time_zone= my_tz_find(session, &tmp_tzname2)))
{
errmsg_printf(ERRMSG_LVL_ERROR,
_("Fatal error: Illegal or unknown default time zone '%s'"),
default_tzname);
return true;
}
}
return false;
}
/**
* @brief
* Get Time_zone object for specified time zone.
*
* @todo
* Not implemented yet. This needs to hook into some sort of OS system call.
*/
Time_zone *
my_tz_find(Session *,
const String *)
{
return NULL;
}
} /* namespace drizzled */
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