timezone.cpp

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/*
**  Command & Conquer Generals Zero Hour(tm)
**  Copyright 2025 Electronic Arts Inc.
**
**  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, either version 3 of the License, or
**  (at your option) any later version.
**
**  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, see <http://www.gnu.org/licenses/>.
*/
 
#include "wlib/xtime.h"
#include "timezone.h"
 
void GetTimezoneInfo(const char * &timezone_str, int &timezone_offset) {
    timezone_str = "Unknown Timezone";
    timezone_offset = 0;
#ifdef _WINDOWS
    struct _timeb    wintime;
    _ftime(&wintime);
 
    if (wintime.dstflag) {
        // Daylight savings time
        if (_daylight) {
            timezone_str = _tzname[1];
        }
    } else {
        timezone_str = _tzname[0];
    }
    timezone_offset = wintime.timezone * 60; // its in minutes...
 
#endif
#ifndef _WINDOWS
    struct timeval   unixtime;
    struct timezone  unixtzone;
    gettimeofday(&unixtime,&unixtzone);
 
    struct tm unixtm;
    localtime_r(&unixtime.tv_sec, &unixtm);
 
    if (unixtm.tm_isdst) {
        // Daylight savings time
        if (daylight) timezone_str = tzname[1];
        timezone_offset = altzone;
    } else {
        timezone_str = tzname[0];
        timezone_offset = timezone;
    }
#endif
}
 
const char * TimezoneString(void) {
    const char *timezone_str;
    int timezone_offset;
    GetTimezoneInfo(timezone_str, timezone_offset);
    return timezone_str;
}
 
int TimezoneOffset(void) {
    const char *timezone_str;
    int timezone_offset;
    GetTimezoneInfo(timezone_str, timezone_offset);
    return timezone_offset;
}