add initial timezone map implementation, borrowed from gnome-control-center

1 files changed, 350 insertions, 0 deletions

diff --git a/libmap/tz.c b/libmap/tz.c
new file mode 100644
index 0000000..3e6c8ae
--- /dev/null
+++ b/libmap/tz.c
@@ -0,0 +1,350 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/* Generic timezone utilities.
+ *
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ *
+ * Authors: Hans Petter Jansson <hpj@ximian.com>
+ * 
+ * Largely based on Michael Fulbright's work on Anaconda.
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+
+#include <glib.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <math.h>
+#include <string.h>
+#include "tz.h"
+
+
+/* Forward declarations for private functions */
+
+static float convert_pos (gchar *pos, int digits);
+static int compare_country_names (const void *a, const void *b);
+static void sort_locations_by_country (GPtrArray *locations);
+static gchar * tz_data_file_get (void);
+
+
+/* ---------------- *
+ * Public interface *
+ * ---------------- */
+TzDB *
+tz_load_db (void)
+{
+	gchar *tz_data_file;
+	TzDB *tz_db;
+	FILE *tzfile;
+	char buf[4096];
+
+	tz_data_file = tz_data_file_get ();
+	if (!tz_data_file) {
+		g_warning ("Could not get the TimeZone data file name");
+		return NULL;
+	}
+	tzfile = fopen (tz_data_file, "r");
+	if (!tzfile) {
+		g_warning ("Could not open *%s*\n", tz_data_file);
+		g_free (tz_data_file);
+		return NULL;
+	}
+
+	tz_db = g_new0 (TzDB, 1);
+	tz_db->locations = g_ptr_array_new ();
+
+	while (fgets (buf, sizeof(buf), tzfile))
+	{
+		gchar **tmpstrarr;
+		gchar *latstr, *lngstr, *p;
+		TzLocation *loc;
+
+		if (*buf == '#') continue;
+
+		g_strchomp(buf);
+		tmpstrarr = g_strsplit(buf,"\t", 6);
+		
+		latstr = g_strdup (tmpstrarr[1]);
+		p = latstr + 1;
+		while (*p != '-' && *p != '+') p++;
+		lngstr = g_strdup (p);
+		*p = '\0';
+		
+		loc = g_new0 (TzLocation, 1);
+		loc->country = g_strdup (tmpstrarr[0]);
+		loc->zone = g_strdup (tmpstrarr[2]);
+		loc->latitude  = convert_pos (latstr, 2);
+		loc->longitude = convert_pos (lngstr, 3);
+		
+#ifdef __sun
+		if (tmpstrarr[3] && *tmpstrarr[3] == '-' && tmpstrarr[4])
+			loc->comment = g_strdup (tmpstrarr[4]);
+
+		if (tmpstrarr[3] && *tmpstrarr[3] != '-' && !islower(loc->zone)) {
+			TzLocation *locgrp;
+
+			/* duplicate entry */
+			locgrp = g_new0 (TzLocation, 1);
+			locgrp->country = g_strdup (tmpstrarr[0]);
+			locgrp->zone = g_strdup (tmpstrarr[3]);
+			locgrp->latitude  = convert_pos (latstr, 2);
+			locgrp->longitude = convert_pos (lngstr, 3);
+			locgrp->comment = (tmpstrarr[4]) ? g_strdup (tmpstrarr[4]) : NULL;
+
+			g_ptr_array_add (tz_db->locations, (gpointer) locgrp);
+		}
+#else
+		loc->comment = (tmpstrarr[3]) ? g_strdup(tmpstrarr[3]) : NULL;
+#endif
+
+		g_ptr_array_add (tz_db->locations, (gpointer) loc);
+
+		g_free (latstr);
+		g_free (lngstr);
+		g_strfreev (tmpstrarr);
+	}
+	
+	fclose (tzfile);
+	
+	/* now sort by country */
+	sort_locations_by_country (tz_db->locations);
+	
+	g_free (tz_data_file);
+	
+	return tz_db;
+}    
+
+static void
+tz_location_free (TzLocation *loc)
+{
+	g_free (loc->country);
+	g_free (loc->zone);
+	g_free (loc->comment);
+
+	g_free (loc);
+}
+
+void
+tz_db_free (TzDB *db)
+{
+	g_ptr_array_foreach (db->locations, (GFunc) tz_location_free, NULL);
+	g_ptr_array_free (db->locations, TRUE);
+	g_free (db);
+}
+
+GPtrArray *
+tz_get_locations (TzDB *db)
+{
+	return db->locations;
+}
+
+
+gchar *
+tz_location_get_country (TzLocation *loc)
+{
+	return loc->country;
+}
+
+
+gchar *
+tz_location_get_zone (TzLocation *loc)
+{
+	return loc->zone;
+}
+
+
+gchar *
+tz_location_get_comment (TzLocation *loc)
+{
+	return loc->comment;
+}
+
+
+void
+tz_location_get_position (TzLocation *loc, double *longitude, double *latitude)
+{
+	*longitude = loc->longitude;
+	*latitude = loc->latitude;
+}
+
+glong
+tz_location_get_utc_offset (TzLocation *loc)
+{
+	TzInfo *tz_info;
+	glong offset;
+
+	tz_info = tz_info_from_location (loc);
+	offset = tz_info->utc_offset;
+	tz_info_free (tz_info);
+	return offset;
+}
+
+gint
+tz_location_set_locally (TzLocation *loc)
+{
+	time_t curtime;
+	struct tm *curzone;
+	gboolean is_dst = FALSE;
+	gint correction = 0;
+
+	g_return_val_if_fail (loc != NULL, 0);
+	g_return_val_if_fail (loc->zone != NULL, 0);
+	
+	curtime = time (NULL);
+	curzone = localtime (&curtime);
+	is_dst = curzone->tm_isdst;
+
+	setenv ("TZ", loc->zone, 1);
+#if 0
+	curtime = time (NULL);
+	curzone = localtime (&curtime);
+
+	if (!is_dst && curzone->tm_isdst) {
+		correction = (60 * 60);
+	}
+	else if (is_dst && !curzone->tm_isdst) {
+		correction = 0;
+	}
+#endif
+
+	return correction;
+}
+
+TzInfo *
+tz_info_from_location (TzLocation *loc)
+{
+	TzInfo *tzinfo;
+	time_t curtime;
+	struct tm *curzone;
+	
+	g_return_val_if_fail (loc != NULL, NULL);
+	g_return_val_if_fail (loc->zone != NULL, NULL);
+	
+	setenv ("TZ", loc->zone, 1);
+	
+#if 0
+	tzset ();
+#endif
+	tzinfo = g_new0 (TzInfo, 1);
+
+	curtime = time (NULL);
+	curzone = localtime (&curtime);
+
+#ifndef __sun
+	/* Currently this solution doesnt seem to work - I get that */
+	/* America/Phoenix uses daylight savings, which is wrong    */
+	tzinfo->tzname_normal = g_strdup (curzone->tm_zone);
+	if (curzone->tm_isdst) 
+		tzinfo->tzname_daylight =
+			g_strdup (&curzone->tm_zone[curzone->tm_isdst]);
+	else
+		tzinfo->tzname_daylight = NULL;
+
+	tzinfo->utc_offset = curzone->tm_gmtoff;
+#else
+	tzinfo->tzname_normal = NULL;
+	tzinfo->tzname_daylight = NULL;
+	tzinfo->utc_offset = 0;
+#endif
+
+	tzinfo->daylight = curzone->tm_isdst;
+	
+	return tzinfo;
+}
+
+
+void
+tz_info_free (TzInfo *tzinfo)
+{
+	g_return_if_fail (tzinfo != NULL);
+	
+	if (tzinfo->tzname_normal) g_free (tzinfo->tzname_normal);
+	if (tzinfo->tzname_daylight) g_free (tzinfo->tzname_daylight);
+	g_free (tzinfo);
+}
+
+/* ----------------- *
+ * Private functions *
+ * ----------------- */
+
+static gchar *
+tz_data_file_get (void)
+{
+	gchar *file;
+
+	file = g_strdup (TZ_DATA_FILE);
+
+	return file;
+}
+
+static float
+convert_pos (gchar *pos, int digits)
+{
+	gchar whole[10];
+	gchar *fraction;
+	gint i;
+	float t1, t2;
+	
+	if (!pos || strlen(pos) < 4 || digits > 9) return 0.0;
+	
+	for (i = 0; i < digits + 1; i++) whole[i] = pos[i];
+	whole[i] = '\0';
+	fraction = pos + digits + 1;
+
+	t1 = g_strtod (whole, NULL);
+	t2 = g_strtod (fraction, NULL);
+
+	if (t1 >= 0.0) return t1 + t2/pow (10.0, strlen(fraction));
+	else return t1 - t2/pow (10.0, strlen(fraction));
+}
+
+
+#if 0
+
+/* Currently not working */
+static void
+free_tzdata (TzLocation *tz)
+{
+	
+	if (tz->country)
+	  g_free(tz->country);
+	if (tz->zone)
+	  g_free(tz->zone);
+	if (tz->comment)
+	  g_free(tz->comment);
+	
+	g_free(tz);
+}
+#endif
+
+
+static int
+compare_country_names (const void *a, const void *b)
+{
+	const TzLocation *tza = * (TzLocation **) a;
+	const TzLocation *tzb = * (TzLocation **) b;
+	
+	return strcmp (tza->zone, tzb->zone);
+}
+
+
+static void
+sort_locations_by_country (GPtrArray *locations)
+{
+	qsort (locations->pdata, locations->len, sizeof (gpointer),
+	       compare_country_names);
+}