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/* gweather-private.c - Overall weather server functions
*
* SPDX-FileCopyrightText: The GWeather authors
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include "gweather-private.h"
/* sign, 3 digits, separator, 4 decimals, nul-char */
#define DEGREES_STR_SIZE (1 + 3 + 1 + 4 + 1)
static GWeatherDb *world_db;
void
_gweather_location_reset_world (void)
{
gsize i;
g_return_if_fail (world_db != NULL);
/* At this point, we had a leak if the caches are not completely empty. */
for (i = 0; i < world_db->locations->len; i++) {
if (G_UNLIKELY (g_ptr_array_index (world_db->locations, i) != NULL)) {
g_warning ("Location with index %li and name %s is still referenced!",
i,
gweather_location_get_name (g_ptr_array_index (world_db->locations, i)));
g_assert_not_reached ();
}
}
for (i = 0; i < world_db->timezones->len; i++) {
if (G_UNLIKELY (g_ptr_array_index (world_db->timezones, i) != NULL)) {
g_warning ("Timezone with index %li and tzid %s is still referenced!",
i,
g_time_zone_get_identifier (g_ptr_array_index (world_db->timezones, i)));
g_assert_not_reached ();
}
}
}
static gpointer
ensure_world (gpointer dummy G_GNUC_UNUSED)
{
g_autoptr (GError) error = NULL;
g_autofree char *filename = NULL;
g_autoptr (GMappedFile) map;
const char *locations_path;
GWeatherDb *db = NULL;
locations_path = g_getenv ("LIBGWEATHER_LOCATIONS_PATH");
if (locations_path != NULL) {
filename = g_strdup (locations_path);
if (!g_file_test (filename, G_FILE_TEST_IS_REGULAR)) {
g_warning ("User specified database %s does not exist", filename);
g_clear_pointer (&filename, g_free);
}
}
if (filename == NULL) {
filename = g_build_filename (GWEATHER_BIN_LOCATION_DIR, "Locations.bin", NULL);
}
map = g_mapped_file_new (filename, FALSE, &error);
if (map == NULL) {
g_critical ("Failed to open database %s: %s", filename, error->message);
return NULL;
}
db = g_new0 (GWeatherDb, 1);
db->world = db_world_from_data (g_mapped_file_get_contents (map), g_mapped_file_get_length (map));
/* This is GWthDB01 */
if (db_world_get_magic (db->world) != 0x5747687442443130) {
g_free (db);
return NULL;
}
db->map = g_steal_pointer (&map);
db->locations_ref = db_world_get_locations (db->world);
db->timezones_ref = db_world_get_timezones (db->world);
db->locations = g_ptr_array_new ();
db->timezones = g_ptr_array_new ();
g_ptr_array_set_size (db->locations, db_arrayof_location_get_length (db->locations_ref));
g_ptr_array_set_size (db->timezones, db_world_timezones_get_length (db->timezones_ref));
world_db = db;
return db;
}
/*< private >
* gweather_location_ensure_world:
*
* Ensures that the locations database is available.
*/
void
gweather_location_ensure_world (void)
{
static GOnce ensure_world_once = G_ONCE_INIT;
g_once (&ensure_world_once, ensure_world, NULL);
}
/*< private >
* gweather_get_db:
*
* Retrieves a pointer to the locations database.
*
* Returns: (transfer none): the root of the locations database
*/
GWeatherDb *
gweather_get_db (void)
{
gweather_location_ensure_world ();
return world_db;
}
char *
_radians_to_degrees_str (gdouble radians)
{
char *str;
double degrees;
str = g_malloc0 (DEGREES_STR_SIZE);
/* Max 4 decimals */
degrees = (double) ((int) (RADIANS_TO_DEGREES (radians) * 10000)) / 10000;
/* Too many digits */
g_return_val_if_fail (degrees <= 1000 || degrees >= -1000, NULL);
return g_ascii_formatd (str, G_ASCII_DTOSTR_BUF_SIZE, "%g", degrees);
}
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