14a2672e28
The timezone map tries to highlight regions of the world that keep the same time, approximating this by their non-daylight-savings UTC offset. There's no reasonable API for this, and it goes wrong in various cases, such as Irish Standard Time which is legally defined as the country's summer time with a negative DST offset in winter. Hardcoding this is unpleasant, but there doesn't seem to be a better solution, and in any case there's already similar hardcoding implied by the segmented map images in panels/datetime/data/timezone_*.png. I've tried to make it practical to fix other similar disagreements between the detected offset and the groupings implied by map images, though for now I've conservatively fixed only the case I'm familiar with. Fixes: #1341
90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
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/* Generic timezone utilities.
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*
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* Copyright (C) 2000-2001 Ximian, Inc.
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*
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* Authors: Hans Petter Jansson <hpj@ximian.com>
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*
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* Largely based on Michael Fulbright's work on Anaconda.
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*
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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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 for more details.
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*
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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, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <glib.h>
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G_BEGIN_DECLS
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#ifndef __sun
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# define TZ_DATA_FILE "/usr/share/zoneinfo/zone.tab"
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#else
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# define TZ_DATA_FILE "/usr/share/lib/zoneinfo/tab/zone_sun.tab"
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#endif
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typedef struct _TzDB TzDB;
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typedef struct _TzLocation TzLocation;
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typedef struct _TzInfo TzInfo;
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struct _TzDB
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{
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GPtrArray *locations;
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GHashTable *backward;
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};
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struct _TzLocation
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{
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gchar *country;
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gdouble latitude;
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gdouble longitude;
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gchar *zone;
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gchar *comment;
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gdouble dist; /* distance to clicked point for comparison */
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};
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/* see the glibc info page information on time zone information */
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/* tzname is the default name for the timezone */
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/* utc_offset is offset in seconds from utc */
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/* daylight if non-zero then location obeys daylight savings */
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struct _TzInfo
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{
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gchar *tzname;
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glong utc_offset;
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gint daylight;
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};
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TzDB *tz_load_db (void);
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void tz_db_free (TzDB *db);
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char * tz_info_get_clean_name (TzDB *tz_db,
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const char *tz);
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GPtrArray *tz_get_locations (TzDB *db);
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void tz_location_get_position (TzLocation *loc,
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double *longitude, double *latitude);
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char *tz_location_get_country (TzLocation *loc);
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gchar *tz_location_get_zone (TzLocation *loc);
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gchar *tz_location_get_comment (TzLocation *loc);
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glong tz_location_get_base_utc_offset (TzLocation *loc);
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gint tz_location_set_locally (TzLocation *loc);
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TzInfo *tz_info_from_location (TzLocation *loc);
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void tz_info_free (TzInfo *tz_info);
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G_DEFINE_AUTOPTR_CLEANUP_FUNC (TzDB, tz_db_free)
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G_DEFINE_AUTOPTR_CLEANUP_FUNC (TzInfo, tz_info_free)
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G_END_DECLS
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