Add support for /etc/geolocation and guessing by timezone

Signed-off-by: Mattias Andrée <m@maandree.se>

1 files changed, 108 insertions, 0 deletions

diff --git a/src/location-timezone.c b/src/location-timezone.c
new file mode 100644
index 0000000..58bf0cf
--- /dev/null
+++ b/src/location-timezone.c
@@ -0,0 +1,108 @@
+/*-
+ * redshift-ng - Automatically adjust display colour temperature according the Sun
+ * 
+ * Copyright (c) 2009-2018        Jon Lund Steffensen <jonlst@gmail.com>
+ * Copyright (c) 2014-2016, 2025  Mattias Andrée <m@maandree.se>
+ * 
+ * redshift-ng 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.
+ * 
+ * redshift-ng 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 redshift-ng.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "common.h"
+
+
+struct location_state {
+	/**
+	 * The loaded location
+	 */
+	struct location location;
+};
+
+
+static int
+timezone_create(struct location_state **state_out)
+{
+	*state_out = emalloc(sizeof(**state_out));
+	return 0;
+}
+
+
+GCC_ONLY(__attribute__((__pure__)))
+static int
+timezone_start(struct location_state *state)
+{
+	struct libgeome_data data;
+	struct libgeome_context ctx;
+	int r;
+	libgeome_basic_context(&ctx, argv0);
+
+	data.requested_data = LIBGEOME_DATUM_LATITUDE | LIBGEOME_DATUM_LONGITUDE;
+	r = libgeome_get_from_timezone(&ctx, &data);
+	if (r) {
+		data.requested_data = LIBGEOME_DATUM_LATITUDE | LIBGEOME_DATUM_LONGITUDE;
+		r = libgeome_get_from_time(&ctx, &data);
+	}
+
+	if (r || !(data.requested_data & LIBGEOME_DATUM_LONGITUDE))
+		return -1;
+	if (data.requested_data & LIBGEOME_DATUM_LATITUDE)
+		state->location.latitude = data.latitude;
+	else
+		state->location.latitude = 0;
+	state->location.longitude = data.longitude;
+	return 0;
+}
+
+
+static void
+timezone_free(struct location_state *state)
+{
+	free(state);
+}
+
+
+static void
+timezone_print_help(void)
+{
+	printf(_("Get rough location from timezone.\n"));
+	printf("\n");
+}
+
+
+static int
+timezone_set_option(struct location_state *state, const char *key, const char *value)
+{
+	(void) state;
+	(void) value;
+	weprintf(_("Unknown provider parameter: `%s'."), key);
+	return -1;
+}
+
+
+static int
+timezone_get_fd(struct location_state *state)
+{
+	(void) state;
+	return -1;
+}
+
+
+static int
+timezone_fetch(struct location_state *state, struct location *location_out, int *available_out)
+{
+	*location_out = state->location;
+	*available_out = 1;
+	return 0;
+}
+
+
+const struct location_provider timezone_location_provider = LOCATION_PROVIDER_INIT("timezone", timezone);