datetime.cpp

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/*
**  ClanLib SDK
**  Copyright (c) 1997-2005 The ClanLib Team
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
**  Note: Some of the libraries ClanLib link to may have additional
**  requirements or restrictions.
**
**  File Author(s):
**
**    Magnus Norddahl
*/

#include "precomp.h"
#include "datetime.h"
#include "exception.h"
#include "string_help.h"

// CL_DateTime Construction:

CL_DateTime::CL_DateTime()
: unix_time(0), tm_local(0), tm_utc(0)
{
}

CL_DateTime::CL_DateTime(time_t unix_time)
: unix_time(unix_time), tm_local(0), tm_utc(0)
{
}

CL_DateTime::CL_DateTime(const CL_DateTime &other)
: unix_time(other.unix_time), tm_local(0), tm_utc(0)
{
}

CL_DateTime::~CL_DateTime()
{
        delete tm_local;
        delete tm_utc;
}

CL_DateTime CL_DateTime::get_system_time()
{
        return CL_DateTime(time(0));
}

// CL_DateTime Attributes:

time_t CL_DateTime::get_unix_time() const
{
        return unix_time;
}

int CL_DateTime::get_seconds_local() const
{
        load_local();
        return tm_local->tm_sec;
}

int CL_DateTime::get_seconds_utc() const
{
        load_utc();
        return tm_utc->tm_sec;
}

int CL_DateTime::get_minutes_local() const
{
        load_local();
        return tm_local->tm_min;
}

int CL_DateTime::get_minutes_utc() const
{
        load_utc();
        return tm_utc->tm_min;
}

int CL_DateTime::get_hours_local() const
{
        load_local();
        return tm_local->tm_hour;
}
        
int CL_DateTime::get_hours_utc() const
{
        load_utc();
        return tm_utc->tm_hour;
}
        
int CL_DateTime::get_month_day_local() const
{
        load_local();
        return tm_local->tm_mday;
}

int CL_DateTime::get_month_day_utc() const
{
        load_utc();
        return tm_utc->tm_mday;
}

int CL_DateTime::get_month_local() const
{
        load_local();
        return tm_local->tm_mon;
}
        
int CL_DateTime::get_month_utc() const
{
        load_utc();
        return tm_utc->tm_mon;
}
        
int CL_DateTime::get_year_local() const
{
        load_local();
        return tm_local->tm_year + 1900;
}
        
int CL_DateTime::get_year_utc() const
{
        load_utc();
        return tm_utc->tm_year + 1900;
}

int CL_DateTime::get_week_day_local() const
{
        load_local();
        return tm_local->tm_wday;
}

int CL_DateTime::get_week_day_utc() const
{
        load_utc();
        return tm_utc->tm_wday;
}

int CL_DateTime::get_year_day_local() const
{
        load_local();
        return tm_local->tm_yday;
}

int CL_DateTime::get_year_day_utc() const
{
        load_utc();
        return tm_utc->tm_yday;
}

int CL_DateTime::get_daylight_saving_time_local() const
{
        load_local();
        return tm_local->tm_isdst;
}

CL_String CL_DateTime::get_zone_abbreviation() const
{
        load_local();
#ifdef WIN32
        return CL_String();
#else
        return CL_StringHelp::local8_to_text(tm_local->tm_zone);
#endif
}

// CL_DateTime Operations:

void CL_DateTime::set_unix_time(time_t t)
{
        unix_time = t;
}

void CL_DateTime::set_seconds_local(int seconds)
{
        load_local();
        tm_local->tm_sec = seconds;
}
        
void CL_DateTime::set_minutes_local(int minutes)
{
        load_local();
        tm_local->tm_min = minutes;
}
        
void CL_DateTime::set_hours_local(int hours)
{
        load_local();
        tm_local->tm_hour = hours;
}
        
void CL_DateTime::set_month_day_local(int day)
{
        load_local();
        tm_local->tm_mday = day;
}

void CL_DateTime::set_month_local(int month)
{
        load_local();
        tm_local->tm_mon = month;
}
        
void CL_DateTime::set_year_local(int year)
{
        load_local();
        tm_local->tm_year = year-1900;
}

void CL_DateTime::save_local()
{
        delete tm_utc;
        tm_utc = 0;
        
        if (tm_local == 0)
                return;

        time_t result = mktime(tm_local);
        if (result == (time_t) -1)
        {
                delete tm_local;
                tm_local = 0;
                throw CL_Exception(TEXT("mktime failed"));
        }
        unix_time = result;
}
        
CL_DateTime &CL_DateTime::operator =(const CL_DateTime &other)
{
        delete tm_local;
        tm_local = 0;
        delete tm_utc;
        tm_utc = 0;
        unix_time = other.unix_time;
        return *this;
}

bool CL_DateTime::operator <(const CL_DateTime &other) const
{
        return unix_time < other.unix_time;
}

bool CL_DateTime::operator <=(const CL_DateTime &other) const
{
        return unix_time <= other.unix_time;
}
        
bool CL_DateTime::operator >(const CL_DateTime &other) const
{
        return unix_time > other.unix_time;
}

bool CL_DateTime::operator >=(const CL_DateTime &other) const
{
        return unix_time >= other.unix_time;
}
        
bool CL_DateTime::operator ==(const CL_DateTime &other) const
{
        return unix_time == other.unix_time;
}

bool CL_DateTime::operator !=(const CL_DateTime &other) const
{
        return unix_time != other.unix_time;
}

// CL_DateTime Implementation:

#ifdef WIN32
CL_Mutex CL_DateTime::mutex;
#endif

void CL_DateTime::load_local() const
{
        if (tm_local)
                return;

#ifdef WIN32
        CL_MutexSection mutexLock(&mutex);
        tm_local = new tm;
        memset(tm_local, 0, sizeof(tm));
        tm *result = localtime(&unix_time);
        if (result == 0)
        {
                delete tm_local;
                tm_local = 0;
                throw CL_Exception(TEXT("localtime_r failed"));
        }
        else
        {
                memcpy(tm_local, result, sizeof(tm));
        }
#else
        tm_local = new tm;
        memset(tm_local, 0, sizeof(tm));
        tm *result = localtime_r(&unix_time, tm_local);
        if (result == 0)
        {
                delete tm_local;
                tm_local = 0;
                throw CL_Exception(TEXT("localtime_r failed"));
        }
#endif
}

void CL_DateTime::load_utc() const
{
        if (tm_utc)
                return;

#ifdef WIN32
        CL_MutexSection mutexLock(&mutex);
        tm_utc = new tm;
        memset(tm_utc, 0, sizeof(tm));
        tm *result = gmtime(&unix_time);
        if (result == 0)
        {
                delete tm_utc;
                tm_utc = 0;
                throw CL_Exception(TEXT("gmtime_r failed"));
        }
        else
        {
                memcpy(tm_utc, result, sizeof(tm));
        }
#else
        tm_utc = new tm;
        memset(tm_utc, 0, sizeof(tm));
        tm *result = gmtime_r(&unix_time, tm_utc);
        if (result == 0)
        {
                delete tm_utc;
                tm_utc = 0;
                throw CL_Exception(TEXT("gmtime_r failed"));
        }
#endif
}

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