Add time synchronization to the example application

examples/Makefile.am

@@ -17,6 +17,7 @@ dctool_SOURCES = \
 	dctool_parse.c \
 	dctool_read.c \
 	dctool_write.c \
+	dctool_timesync.c \
 	dctool_fwupdate.c \
 	output.h \
 	output-private.h \

examples/dctool.c

@@ -63,6 +63,7 @@ static const dctool_command_t *g_commands[] = {
 	&dctool_parse,
 	&dctool_read,
 	&dctool_write,
+	&dctool_timesync,
 	&dctool_fwupdate,
 	NULL
 };

examples/dctool.h

@@ -50,6 +50,7 @@ extern const dctool_command_t dctool_dump;
 extern const dctool_command_t dctool_parse;
 extern const dctool_command_t dctool_read;
 extern const dctool_command_t dctool_write;
+extern const dctool_command_t dctool_timesync;
 extern const dctool_command_t dctool_fwupdate;
 
 const dctool_command_t *

examples/dctool_timesync.c

@@ -0,0 +1,162 @@
+/*
+ * libdivecomputer
+ *
+ * Copyright (C) 2017 Jef Driesen
+ *
+ * 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 Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#endif
+
+#include <libdivecomputer/context.h>
+#include <libdivecomputer/descriptor.h>
+#include <libdivecomputer/device.h>
+
+#include "dctool.h"
+#include "common.h"
+#include "utils.h"
+
+static dc_status_t
+do_timesync (dc_context_t *context, dc_descriptor_t *descriptor, const char *devname, const dc_datetime_t *datetime)
+{
+	dc_status_t rc = DC_STATUS_SUCCESS;
+	dc_device_t *device = NULL;
+
+	// Open the device.
+	message ("Opening the device (%s %s, %s).\n",
+		dc_descriptor_get_vendor (descriptor),
+		dc_descriptor_get_product (descriptor),
+		devname ? devname : "null");
+	rc = dc_device_open (&device, context, descriptor, devname);
+	if (rc != DC_STATUS_SUCCESS) {
+		ERROR ("Error opening the device.");
+		goto cleanup;
+	}
+
+	// Register the event handler.
+	message ("Registering the event handler.\n");
+	int events = DC_EVENT_WAITING | DC_EVENT_PROGRESS | DC_EVENT_DEVINFO | DC_EVENT_CLOCK | DC_EVENT_VENDOR;
+	rc = dc_device_set_events (device, events, dctool_event_cb, NULL);
+	if (rc != DC_STATUS_SUCCESS) {
+		ERROR ("Error registering the event handler.");
+		goto cleanup;
+	}
+
+	// Register the cancellation handler.
+	message ("Registering the cancellation handler.\n");
+	rc = dc_device_set_cancel (device, dctool_cancel_cb, NULL);
+	if (rc != DC_STATUS_SUCCESS) {
+		ERROR ("Error registering the cancellation handler.");
+		goto cleanup;
+	}
+
+	// Syncronize the device clock.
+	message ("Syncronize the device clock.\n");
+	rc = dc_device_timesync (device, datetime);
+	if (rc != DC_STATUS_SUCCESS) {
+		ERROR ("Error syncronizing the device clock.");
+		goto cleanup;
+	}
+
+cleanup:
+	dc_device_close (device);
+	return rc;
+}
+
+static int
+dctool_timesync_run (int argc, char *argv[], dc_context_t *context, dc_descriptor_t *descriptor)
+{
+	int exitcode = EXIT_SUCCESS;
+	dc_status_t status = DC_STATUS_SUCCESS;
+
+	// Default option values.
+	unsigned int help = 0;
+
+	// Parse the command-line options.
+	int opt = 0;
+	const char *optstring = "h";
+#ifdef HAVE_GETOPT_LONG
+	struct option options[] = {
+		{"help",        no_argument,       0, 'h'},
+		{0,             0,                 0,  0 }
+	};
+	while ((opt = getopt_long (argc, argv, optstring, options, NULL)) != -1) {
+#else
+	while ((opt = getopt (argc, argv, optstring)) != -1) {
+#endif
+		switch (opt) {
+		case 'h':
+			help = 1;
+			break;
+		default:
+			return EXIT_FAILURE;
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	// Show help message.
+	if (help) {
+		dctool_command_showhelp (&dctool_timesync);
+		return EXIT_SUCCESS;
+	}
+
+	// Get the system time.
+	dc_datetime_t datetime = {0};
+	dc_ticks_t now = dc_datetime_now ();
+	if (!dc_datetime_localtime(&datetime, now)) {
+		message ("ERROR: Failed to get the system time.\n");
+		exitcode = EXIT_FAILURE;
+		goto cleanup;
+	}
+
+	// Synchronize the device clock.
+	status = do_timesync (context, descriptor, argv[0], &datetime);
+	if (status != DC_STATUS_SUCCESS) {
+		message ("ERROR: %s\n", dctool_errmsg (status));
+		exitcode = EXIT_FAILURE;
+		goto cleanup;
+	}
+
+cleanup:
+	return exitcode;
+}
+
+const dctool_command_t dctool_timesync = {
+	dctool_timesync_run,
+	DCTOOL_CONFIG_DESCRIPTOR,
+	"timesync",
+	"Synchronize the device clock",
+	"Usage:\n"
+	"   dctool timesync [options]\n"
+	"\n"
+	"Options:\n"
+#ifdef HAVE_GETOPT_LONG
+	"   -h, --help   Show help message\n"
+#else
+	"   -h   Show help message\n"
+#endif
+};