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/*
* Copyright (c) 2002-2019 Balabit
* Copyright (c) 1998-2019 Balázs Scheidler
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "timeutils/conv.h"
#include "timeutils/cache.h"
#include "timeutils/misc.h"
void
convert_wall_clock_time_to_unix_time(const WallClockTime *src, UnixTime *dst)
{
WallClockTime work_wct = *src;
convert_and_normalize_wall_clock_time_to_unix_time(&work_wct, dst);
}
void
convert_wall_clock_time_to_unix_time_with_tz_hint(const WallClockTime *src, UnixTime *dst, long gmtoff_hint)
{
WallClockTime work_wct = *src;
convert_and_normalize_wall_clock_time_to_unix_time_with_tz_hint(&work_wct, dst, gmtoff_hint);
}
void
convert_and_normalize_wall_clock_time_to_unix_time(WallClockTime *src, UnixTime *dst)
{
convert_and_normalize_wall_clock_time_to_unix_time_with_tz_hint(src, dst, -1);
}
/* hint the timezone value if it is not present in the wct struct, e.g. the
* timestamp takes precedence, but as an additional information the caller
* can supply its best idea. this maps nicely to the source-side
* time-zone() value, which is only used in case an incoming timestamp does
* not have the timestamp value. */
void
convert_and_normalize_wall_clock_time_to_unix_time_with_tz_hint(WallClockTime *src, UnixTime *dst, long gmtoff_hint)
{
/* usec is just copied over, doesn't change timezone or anything */
dst->ut_usec = src->wct_usec;
/* determine target gmtoff if it's coming from the timestamp or from the hint */
gint target_gmtoff = src->wct_gmtoff;
if (target_gmtoff == -1)
target_gmtoff = gmtoff_hint;
/* FIRST: We convert the timestamp as it was in our local time zone. */
gint unnormalized_hour = src->wct_hour;
src->wct_isdst = -1;
dst->ut_sec = cached_mktime_wct(src);
gint normalized_hour = src->wct_hour;
/* SECOND: adjust ut_sec as if we converted it according to our timezone. */
gint local_gmtoff = get_local_timezone_ofs(dst->ut_sec);
if (target_gmtoff == -1)
{
target_gmtoff = local_gmtoff;
}
dst->ut_sec = dst->ut_sec
+ local_gmtoff
- (normalized_hour - unnormalized_hour) * 3600
- target_gmtoff;
dst->ut_gmtoff = target_gmtoff;
src->wct_gmtoff = dst->ut_gmtoff;
src->wct_hour = unnormalized_hour;
}
void
convert_unix_time_to_wall_clock_time(const UnixTime *src, WallClockTime *dst)
{
convert_unix_time_to_wall_clock_time_with_tz_override(src, dst, -1);
}
/* the timezone information overrides what is present in the timestamp, e.g.
* it will _convert_ the timestamp to a destination timezone */
void
convert_unix_time_to_wall_clock_time_with_tz_override(const UnixTime *src, WallClockTime *dst, gint gmtoff_override)
{
gint gmtoff = gmtoff_override;
if (gmtoff == -1)
gmtoff = src->ut_gmtoff;
if (gmtoff == -1)
gmtoff = get_local_timezone_ofs(src->ut_sec);
time_t t = src->ut_sec + gmtoff;
cached_gmtime_wct(&t, dst);
dst->wct_gmtoff = gmtoff;
dst->wct_zone = NULL;
dst->wct_usec = src->ut_usec;
}
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