Пример #1
0
int
param_get(param_t param, void *val)
{
    int result = -1;

    const void *v = param_get_value_ptr(param);

    if (val != NULL) {
	memcpy(val, v, param_size(param));
	result = 0;
    }

    return result;
}
Пример #2
0
int
param_get(param_t param, void *val)
{
	int result = -1;

	param_lock();

	if (!handle_in_range(param)) {
		return result;
	}

	union param_value_u value;

	if (update_from_shmem(param, &value)) {
		set_called_from_get = 1;
		param_set_internal(param, &value, true, false, false);
		set_called_from_get = 0;
	}


	const void *v = param_get_value_ptr(param);

	if (val != NULL) {
		memcpy(val, v, param_size(param));
		result = 0;
	}

#ifdef ENABLE_SHMEM_DEBUG

	if (param_type(param) == PARAM_TYPE_INT32) {
		PX4_INFO("param_get for %s : %d\n", param_name(param), ((union param_value_u *)val)->i);
	}

	else if (param_type(param) == PARAM_TYPE_FLOAT) {
		PX4_INFO("param_get for %s : %f\n", param_name(param), (double)((union param_value_u *)val)->f);
	}

	else {
		PX4_INFO("Unknown param type for %s\n", param_name(param));
	}

#endif

	param_unlock();

	return result;
}
Пример #3
0
static void
do_show_print(void *arg, param_t param)
{
	int32_t i;
	float f;
	const char *search_string = (const char*)arg;

	/* print nothing if search string valid and not matching */
	if (arg != NULL && (strcmp(search_string, param_name(param) != 0)))
		return;

	printf("%c %s: ",
	       param_value_unsaved(param) ? '*' : (param_value_is_default(param) ? ' ' : '+'),
	       param_name(param));

	/*
	 * This case can be expanded to handle printing common structure types.
	 */

	switch (param_type(param)) {
	case PARAM_TYPE_INT32:
		if (!param_get(param, &i)) {
			printf("%d\n", i);
			return;
		}

		break;

	case PARAM_TYPE_FLOAT:
		if (!param_get(param, &f)) {
			printf("%4.4f\n", (double)f);
			return;
		}

		break;

	case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
		printf("<struct type %d size %u>\n", 0 + param_type(param), param_size(param));
		return;

	default:
		printf("<unknown type %d>\n", 0 + param_type(param));
		return;
	}

	printf("<error fetching parameter %d>\n", param);
}
Пример #4
0
int
param_get(param_t param, void *val)
{
	int result = -1;

	param_lock_reader();
	perf_begin(param_get_perf);

	const void *v = param_get_value_ptr(param);

	if (val && v) {
		memcpy(val, v, param_size(param));
		result = 0;
	}

	perf_end(param_get_perf);
	param_unlock_reader();

	return result;
}
Пример #5
0
int
param_export(int fd, bool only_unsaved)
{
	struct param_wbuf_s *s = NULL;
	struct bson_encoder_s encoder;
	int	result = -1;

	param_lock();

	bson_encoder_init_file(&encoder, fd);

	/* no modified parameters -> we are done */
	if (param_values == NULL) {
		result = 0;
		goto out;
	}

	while ((s = (struct param_wbuf_s *)utarray_next(param_values, s)) != NULL) {

		int32_t	i;
		float	f;

		/*
		 * If we are only saving values changed since last save, and this
		 * one hasn't, then skip it
		 */
		if (only_unsaved && !s->unsaved) {
			continue;
		}

		s->unsaved = false;

		/* append the appropriate BSON type object */

		switch (param_type(s->param)) {

		case PARAM_TYPE_INT32:
			param_get(s->param, &i);

			if (bson_encoder_append_int(&encoder, param_name(s->param), i)) {
				debug("BSON append failed for '%s'", param_name(s->param));
				goto out;
			}

			break;

		case PARAM_TYPE_FLOAT:
			param_get(s->param, &f);

			if (bson_encoder_append_double(&encoder, param_name(s->param), f)) {
				debug("BSON append failed for '%s'", param_name(s->param));
				goto out;
			}

			break;

		case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
			if (bson_encoder_append_binary(&encoder,
						       param_name(s->param),
						       BSON_BIN_BINARY,
						       param_size(s->param),
						       param_get_value_ptr(s->param))) {
				debug("BSON append failed for '%s'", param_name(s->param));
				goto out;
			}

			break;

		default:
			debug("unrecognized parameter type");
			goto out;
		}
	}

	result = 0;

out:
	param_unlock();

	if (result == 0) {
		result = bson_encoder_fini(&encoder);
	}

	return result;
}
Пример #6
0
static int
param_set_internal(param_t param, const void *val, bool mark_saved, bool notify_changes)
{
	int result = -1;
	bool params_changed = false;

	param_lock();

	if (param_values == NULL) {
		utarray_new(param_values, &param_icd);
	}

	if (param_values == NULL) {
		debug("failed to allocate modified values array");
		goto out;
	}

	if (handle_in_range(param)) {

		struct param_wbuf_s *s = param_find_changed(param);

		if (s == NULL) {

			/* construct a new parameter */
			struct param_wbuf_s buf = {
				.param = param,
				.val.p = NULL,
				.unsaved = false
			};

			/* add it to the array and sort */
			utarray_push_back(param_values, &buf);
			utarray_sort(param_values, param_compare_values);

			/* find it after sorting */
			s = param_find_changed(param);
		}

		/* update the changed value */
		switch (param_type(param)) {

		case PARAM_TYPE_INT32:
			s->val.i = *(int32_t *)val;
			break;

		case PARAM_TYPE_FLOAT:
			s->val.f = *(float *)val;
			break;

		case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
			if (s->val.p == NULL) {
				s->val.p = malloc(param_size(param));

				if (s->val.p == NULL) {
					debug("failed to allocate parameter storage");
					goto out;
				}
			}

			memcpy(s->val.p, val, param_size(param));
			break;

		default:
			goto out;
		}

		s->unsaved = !mark_saved;
		params_changed = true;
		result = 0;
	}

out:
	param_unlock();

	/*
	 * If we set something, now that we have unlocked, go ahead and advertise that
	 * a thing has been set.
	 */
	if (params_changed && notify_changes) {
		param_notify_changes();
	}

	return result;
}

int
param_set(param_t param, const void *val)
{
	return param_set_internal(param, val, false, true);
}

int
param_set_no_notification(param_t param, const void *val)
{
	return param_set_internal(param, val, false, false);
}

bool
param_used(param_t param)
{
	int param_index = param_get_index(param);

	if (param_index < 0) {
		return false;
	}

	return param_changed_storage[param_index / bits_per_allocation_unit] &
	       (1 << param_index % bits_per_allocation_unit);
}
Пример #7
0
static int
param_set_internal(param_t param, const void *val, bool mark_saved, bool notify_changes)
{
	int result = -1;
	bool params_changed = false;

	param_lock_writer();
	perf_begin(param_set_perf);

	if (param_values == NULL) {
		utarray_new(param_values, &param_icd);
	}

	if (param_values == NULL) {
		PX4_ERR("failed to allocate modified values array");
		goto out;
	}

	if (handle_in_range(param)) {

		struct param_wbuf_s *s = param_find_changed(param);

		if (s == NULL) {

			/* construct a new parameter */
			struct param_wbuf_s buf = {
				.param = param,
				.val.p = NULL,
				.unsaved = false
			};
			params_changed = true;

			/* add it to the array and sort */
			utarray_push_back(param_values, &buf);
			utarray_sort(param_values, param_compare_values);

			/* find it after sorting */
			s = param_find_changed(param);
		}

		/* update the changed value */
		switch (param_type(param)) {

		case PARAM_TYPE_INT32:
			params_changed = params_changed || s->val.i != *(int32_t *)val;
			s->val.i = *(int32_t *)val;
			break;

		case PARAM_TYPE_FLOAT:
			params_changed = params_changed || fabsf(s->val.f - * (float *)val) > FLT_EPSILON;
			s->val.f = *(float *)val;
			break;

		case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
			if (s->val.p == NULL) {
				size_t psize = param_size(param);

				if (psize > 0) {
					s->val.p = malloc(psize);

				} else {
					s->val.p = NULL;
				}

				if (s->val.p == NULL) {
					PX4_ERR("failed to allocate parameter storage");
					goto out;
				}
			}

			memcpy(s->val.p, val, param_size(param));
			params_changed = true;
			break;

		default:
			goto out;
		}

		s->unsaved = !mark_saved;
		result = 0;

		if (!mark_saved) { // this is false when importing parameters
			param_autosave();
		}
	}

out:
	perf_end(param_set_perf);
	param_unlock_writer();

	/*
	 * If we set something, now that we have unlocked, go ahead and advertise that
	 * a thing has been set.
	 */
	if (params_changed && notify_changes) {
		_param_notify_changes();
	}

	return result;
}

#if defined(FLASH_BASED_PARAMS)
int param_set_external(param_t param, const void *val, bool mark_saved, bool notify_changes)
{
	return param_set_internal(param, val, mark_saved, notify_changes);
}

const void *param_get_value_ptr_external(param_t param)
{
	return param_get_value_ptr(param);
}
#endif

int
param_set(param_t param, const void *val)
{
	return param_set_internal(param, val, false, true);
}

int
param_set_no_notification(param_t param, const void *val)
{
	return param_set_internal(param, val, false, false);
}

bool
param_used(param_t param)
{
	int param_index = param_get_index(param);

	if (param_index < 0) {
		return false;
	}

	return param_changed_storage[param_index / bits_per_allocation_unit] &
	       (1 << param_index % bits_per_allocation_unit);
}
Пример #8
0
int
param_export(int fd, bool only_unsaved)
{
	perf_begin(param_export_perf);

	struct param_wbuf_s *s = NULL;
	int	result = -1;

	struct bson_encoder_s encoder;

	int shutdown_lock_ret = px4_shutdown_lock();

	if (shutdown_lock_ret) {
		PX4_ERR("px4_shutdown_lock() failed (%i)", shutdown_lock_ret);
	}

	// take the file lock
	do {} while (px4_sem_wait(&param_sem_save) != 0);

	param_lock_reader();

	uint8_t bson_buffer[256];
	bson_encoder_init_buf_file(&encoder, fd, &bson_buffer, sizeof(bson_buffer));

	/* no modified parameters -> we are done */
	if (param_values == NULL) {
		result = 0;
		goto out;
	}

	while ((s = (struct param_wbuf_s *)utarray_next(param_values, s)) != NULL) {
		/*
		 * If we are only saving values changed since last save, and this
		 * one hasn't, then skip it
		 */
		if (only_unsaved && !s->unsaved) {
			continue;
		}

		s->unsaved = false;

		const char *name = param_name(s->param);
		const size_t size = param_size(s->param);

		/* append the appropriate BSON type object */
		switch (param_type(s->param)) {

		case PARAM_TYPE_INT32: {
				const int32_t i = s->val.i;

				debug("exporting: %s (%d) size: %d val: %d", name, s->param, size, i);

				if (bson_encoder_append_int(&encoder, name, i)) {
					PX4_ERR("BSON append failed for '%s'", name);
					goto out;
				}
			}
			break;

		case PARAM_TYPE_FLOAT: {
				const float f = s->val.f;

				debug("exporting: %s (%d) size: %d val: %.3f", name, s->param, size, (double)f);

				if (bson_encoder_append_double(&encoder, name, f)) {
					PX4_ERR("BSON append failed for '%s'", name);
					goto out;
				}
			}
			break;

		case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX: {
				const void *value_ptr = param_get_value_ptr(s->param);

				/* lock as short as possible */
				if (bson_encoder_append_binary(&encoder,
							       name,
							       BSON_BIN_BINARY,
							       size,
							       value_ptr)) {

					PX4_ERR("BSON append failed for '%s'", name);
					goto out;
				}
			}
			break;

		default:
			PX4_ERR("unrecognized parameter type");
			goto out;
		}
	}

	result = 0;

out:

	if (result == 0) {
		if (bson_encoder_fini(&encoder) != PX4_OK) {
			PX4_ERR("bson encoder finish failed");
		}
	}

	param_unlock_reader();

	px4_sem_post(&param_sem_save);

	if (shutdown_lock_ret == 0) {
		px4_shutdown_unlock();
	}

	perf_end(param_export_perf);

	return result;
}
Пример #9
0
static int
param_set_internal(param_t param, const void *val, bool mark_saved, bool notify_changes, bool is_saved)
{
	int result = -1;
	bool params_changed = false;

	PX4_DEBUG("param_set_internal params: param = %d, val = 0x%X, mark_saved: %d, notify_changes: %d",
		  param, val, (int)mark_saved, (int)notify_changes);

	param_lock();

	if (!handle_in_range(param)) {
		return result;
	}

	mark_saved = true; //mark all params as saved

	if (param_values == NULL) {
		utarray_new(param_values, &param_icd);
	}

	if (param_values == NULL) {
		debug("failed to allocate modified values array");
		goto out;
	}

	if (handle_in_range(param)) {

		struct param_wbuf_s *s = param_find_changed(param);

		if (s == NULL) {

			/* construct a new parameter */
			struct param_wbuf_s buf = {
				.param = param,
				.val.p = NULL,
				.unsaved = false
			};

			/* add it to the array and sort */
			utarray_push_back(param_values, &buf);
			utarray_sort(param_values, param_compare_values);

			/* find it after sorting */
			s = param_find_changed(param);
		}

		/* update the changed value */
		switch (param_type(param)) {

		case PARAM_TYPE_INT32:
			s->val.i = *(int32_t *)val;
			break;

		case PARAM_TYPE_FLOAT:
			s->val.f = *(float *)val;
			break;

		case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
			if (s->val.p == NULL) {
				s->val.p = malloc(param_size(param));

				if (s->val.p == NULL) {
					debug("failed to allocate parameter storage");
					goto out;
				}
			}

			memcpy(s->val.p, val, param_size(param));
			break;

		default:
			goto out;
		}

		s->unsaved = !mark_saved;
		params_changed = true;
		result = 0;
	}

out:
	param_unlock();

	/*
	 * If we set something, now that we have unlocked, go ahead and advertise that
	 * a thing has been set.
	 */

	if (!param_import_done) { notify_changes = 0; }

	if (params_changed && notify_changes) {
		param_notify_changes(is_saved);
	}

	if (result == 0 && !set_called_from_get) {
		update_to_shmem(param, *(union param_value_u *)val);
	}

#ifdef ENABLE_SHMEM_DEBUG

	if (param_type(param) == PARAM_TYPE_INT32) {
		PX4_INFO("param_set for %s : %d\n", param_name(param), ((union param_value_u *)val)->i);
	}

	else if (param_type(param) == PARAM_TYPE_FLOAT) {
		PX4_INFO("param_set for %s : %f\n", param_name(param), (double)((union param_value_u *)val)->f);
	}

	else {
		PX4_INFO("Unknown param type for %s\n", param_name(param));
	}

#endif

	return result;
}

int
param_set(param_t param, const void *val)
{
	return param_set_internal(param, val, false, true, false);
}

int
param_set_no_autosave(param_t param, const void *val)
{
	return param_set_internal(param, val, false, true, true);
}

int
param_set_no_notification(param_t param, const void *val)
{
	return param_set_internal(param, val, false, false, false);
}

bool
param_used(param_t param)
{
	// TODO FIXME: for now all params are used
	return true;

	int param_index = param_get_index(param);

	if (param_index < 0) {
		return false;
	}

	return param_changed_storage[param_index / bits_per_allocation_unit] &
	       (1 << param_index % bits_per_allocation_unit);
}

void param_set_used_internal(param_t param)
{
	int param_index = param_get_index(param);

	if (param_index < 0) {
		return;
	}

	param_changed_storage[param_index / bits_per_allocation_unit] |=
		(1 << param_index % bits_per_allocation_unit);
}
Пример #10
0
static void
do_show_print(void *arg, param_t param)
{
	int32_t i;
	float f;
	const char *search_string = (const char*)arg;
	const char *p_name = (const char*)param_name(param);

	/* print nothing if search string is invalid and not matching */
	if (!(arg == NULL)) {

		/* start search */
		char *ss = search_string;
		char *pp = p_name;
		bool mismatch = false;

		/* XXX this comparison is only ok for trailing wildcards */
		while (*ss != '\0' && *pp != '\0') {

			if (*ss == *pp) {
				ss++;
				pp++;
			} else if (*ss == '*') {
				if (*(ss + 1) != '\0') {
					warnx("* symbol only allowed at end of search string.");
					exit(1);
				}

				pp++;
			} else {
				/* param not found */
				return;
			}
		}

		/* the search string must have been consumed */
		if (!(*ss == '\0' || *ss == '*'))
			return;
	}

	printf("%c %s: ",
	       param_value_unsaved(param) ? '*' : (param_value_is_default(param) ? ' ' : '+'),
	       param_name(param));

	/*
	 * This case can be expanded to handle printing common structure types.
	 */

	switch (param_type(param)) {
	case PARAM_TYPE_INT32:
		if (!param_get(param, &i)) {
			printf("%d\n", i);
			return;
		}

		break;

	case PARAM_TYPE_FLOAT:
		if (!param_get(param, &f)) {
			printf("%4.4f\n", (double)f);
			return;
		}

		break;

	case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
		printf("<struct type %d size %u>\n", 0 + param_type(param), param_size(param));
		return;

	default:
		printf("<unknown type %d>\n", 0 + param_type(param));
		return;
	}

	printf("<error fetching parameter %d>\n", param);
}
Пример #11
0
static void
do_show_print(void *arg, param_t param)
{
	int32_t i;
	float f;
	const char *search_string = (const char *)arg;
	const char *p_name = (const char *)param_name(param);

	/* print nothing if search string is invalid and not matching */
	if (!(arg == NULL)) {

		/* start search */
		const char *ss = search_string;
		const char *pp = p_name;

		/* XXX this comparison is only ok for trailing wildcards */
		while (*ss != '\0' && *pp != '\0') {

			// case insensitive comparison (param_name is always upper case)
			if (toupper(*ss) == *pp) {
				ss++;
				pp++;

			} else if (*ss == '*') {
				if (*(ss + 1) != '\0') {
					PX4_WARN("* symbol only allowed at end of search string");
					// FIXME - should exit
					return;
				}

				pp++;

			} else {
				/* param not found */
				return;
			}
		}

		/* the search string must have been consumed */
		if (!(*ss == '\0' || *ss == '*') || *pp != '\0') {
			return;
		}
	}

	PARAM_PRINT("%c %c %s [%d,%d] : ", (param_used(param) ? 'x' : ' '),
		    param_value_unsaved(param) ? '*' : (param_value_is_default(param) ? ' ' : '+'),
		    param_name(param), param_get_used_index(param), param_get_index(param));

	/*
	 * This case can be expanded to handle printing common structure types.
	 */

	switch (param_type(param)) {
	case PARAM_TYPE_INT32:
		if (!param_get(param, &i)) {
			PARAM_PRINT("%ld\n", (long)i);
			return;
		}

		break;

	case PARAM_TYPE_FLOAT:
		if (!param_get(param, &f)) {
			PARAM_PRINT("%4.4f\n", (double)f);
			return;
		}

		break;

	case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
		PARAM_PRINT("<struct type %d size %zu>\n", 0 + param_type(param), param_size(param));
		return;

	default:
		PARAM_PRINT("<unknown type %d>\n", 0 + param_type(param));
		return;
	}

	PARAM_PRINT("<error fetching parameter %lu>\n", (unsigned long)param);
}
Пример #12
0
int
param_export(int fd, bool only_unsaved)
{
	struct param_wbuf_s *s = NULL;
	struct bson_encoder_s encoder;
	int	result = -1;

	param_lock();

	param_bus_lock(true);
	bson_encoder_init_file(&encoder, fd);
	param_bus_lock(false);

	/* no modified parameters -> we are done */
	if (param_values == NULL) {
		result = 0;
		goto out;
	}

	while ((s = (struct param_wbuf_s *)utarray_next(param_values, s)) != NULL) {

		int32_t	i;
		float	f;

		/*
		 * If we are only saving values changed since last save, and this
		 * one hasn't, then skip it
		 */
		if (only_unsaved && !s->unsaved) {
			continue;
		}

		s->unsaved = false;

		/* append the appropriate BSON type object */


		switch (param_type(s->param)) {

		case PARAM_TYPE_INT32: {
				param_get(s->param, &i);
				const char *name = param_name(s->param);

				/* lock as short as possible */
				param_bus_lock(true);

				if (bson_encoder_append_int(&encoder, name, i)) {
					param_bus_lock(false);
					debug("BSON append failed for '%s'", name);
					goto out;
				}
			}
			break;

		case PARAM_TYPE_FLOAT: {

				param_get(s->param, &f);
				const char *name = param_name(s->param);

				/* lock as short as possible */
				param_bus_lock(true);

				if (bson_encoder_append_double(&encoder, name, f)) {
					param_bus_lock(false);
					debug("BSON append failed for '%s'", name);
					goto out;
				}
			}
			break;

		case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX: {

				const char *name = param_name(s->param);
				const size_t size = param_size(s->param);
				const void *value_ptr = param_get_value_ptr(s->param);

				/* lock as short as possible */
				param_bus_lock(true);

				if (bson_encoder_append_binary(&encoder,
							       name,
							       BSON_BIN_BINARY,
							       size,
							       value_ptr)) {
					param_bus_lock(false);
					debug("BSON append failed for '%s'", name);
					goto out;
				}
			}
			break;

		default:
			debug("unrecognized parameter type");
			goto out;
		}

		param_bus_lock(false);

		/* allow this process to be interrupted by another process / thread */
		usleep(5);
	}

	result = 0;

out:
	param_unlock();

	if (result == 0) {
		result = bson_encoder_fini(&encoder);
	}

	return result;
}
Пример #13
0
static int
param_set_internal(param_t param, const void *val, bool mark_saved)
{
	int result = -1;
	bool params_changed = false;

	param_lock();

	if (param_values == NULL)
		utarray_new(param_values, &param_icd);

	if (param_values == NULL) {
		debug("failed to allocate modified values array");
		goto out;
	}

	if (handle_in_range(param)) {

		struct param_wbuf_s *s = param_find_changed(param);

		if (s == NULL) {

			/* construct a new parameter */
			struct param_wbuf_s buf = {
				.param = param,
				.val.p = NULL,
				.unsaved = false
			};

			/* add it to the array and sort */
			utarray_push_back(param_values, &buf);
			utarray_sort(param_values, param_compare_values);

			/* find it after sorting */
			s = param_find_changed(param);
		}

		/* update the changed value */
		switch (param_type(param)) {
		case PARAM_TYPE_INT32:
			s->val.i = *(int32_t *)val;
			break;

		case PARAM_TYPE_FLOAT:
			s->val.f = *(float *)val;
			break;

		case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
			if (s->val.p == NULL) {
				s->val.p = malloc(param_size(param));

				if (s->val.p == NULL) {
					debug("failed to allocate parameter storage");
					goto out;
				}
			}

			memcpy(s->val.p, val, param_size(param));
			break;

		default:
			goto out;
		}

		s->unsaved = !mark_saved;
		params_changed = true;
		result = 0;
	}

out:
	param_unlock();

	/*
	 * If we set something, now that we have unlocked, go ahead and advertise that
	 * a thing has been set.
	 */
	if (params_changed)
		param_notify_changes();

	return result;
}

int
param_set(param_t param, const void *val)
{
	return param_set_internal(param, val, false);
}

void
param_reset(param_t param)
{
	struct param_wbuf_s *s = NULL;

	param_lock();

	if (handle_in_range(param)) {

		/* look for a saved value */
		s = param_find_changed(param);

		/* if we found one, erase it */
		if (s != NULL) {
			int pos = utarray_eltidx(param_values, s);
			utarray_erase(param_values, pos, 1);
		}
	}

	param_unlock();

	if (s != NULL)
		param_notify_changes();
}

void
param_reset_all(void)
{
	param_lock();

	if (param_values != NULL) {
		utarray_free(param_values);
	}

	/* mark as reset / deleted */
	param_values = NULL;

	param_unlock();

	param_notify_changes();
}
Пример #14
0
static int
param_export_internal(bool only_unsaved)
{
	struct param_wbuf_s *s = NULL;
	struct bson_encoder_s encoder;
	int     result = -1;

	param_lock();

	/* Use realloc */

	bson_encoder_init_buf(&encoder, NULL, 0);

	/* no modified parameters -> we are done */
	if (param_values == NULL) {
		result = 0;
		goto out;
	}

	while ((s = (struct param_wbuf_s *)utarray_next(param_values, s)) != NULL) {

		int32_t i;
		float   f;

		/*
		 * If we are only saving values changed since last save, and this
		 * one hasn't, then skip it
		 */
		if (only_unsaved && !s->unsaved) {
			continue;
		}

		s->unsaved = false;

		/* append the appropriate BSON type object */

		switch (param_type(s->param)) {

		case PARAM_TYPE_INT32:
			param_get(s->param, &i);

			if (bson_encoder_append_int(&encoder, param_name(s->param), i)) {
				debug("BSON append failed for '%s'", param_name(s->param));
				goto out;
			}

			break;

		case PARAM_TYPE_FLOAT:
			param_get(s->param, &f);

			if (bson_encoder_append_double(&encoder, param_name(s->param), f)) {
				debug("BSON append failed for '%s'", param_name(s->param));
				goto out;
			}

			break;

		case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
			if (bson_encoder_append_binary(&encoder,
						       param_name(s->param),
						       BSON_BIN_BINARY,
						       param_size(s->param),
						       param_get_value_ptr_external(s->param))) {
				debug("BSON append failed for '%s'", param_name(s->param));
				goto out;
			}

			break;

		default:
			debug("unrecognized parameter type");
			goto out;
		}
	}

	result = 0;

out:
	param_unlock();

	if (result == 0) {

		/* Finalize the bison encoding*/

		bson_encoder_fini(&encoder);

		/* Get requiered space */

		size_t buf_size = bson_encoder_buf_size(&encoder);

		/* Get a buffer from the flash driver with enough space */

		uint8_t *buffer;
		result = parameter_flashfs_alloc(parameters_token, &buffer, &buf_size);

		if (result == OK) {

			/* Check for a write that has no changes */

			uint8_t *was_buffer;
			size_t was_buf_size;
			int was_result = parameter_flashfs_read(parameters_token, &was_buffer, &was_buf_size);

			void *enc_buff = bson_encoder_buf_data(&encoder);

			bool commit = was_result < OK || was_buf_size != buf_size || 0 != memcmp(was_buffer, enc_buff, was_buf_size);

			if (commit) {

				memcpy(buffer, enc_buff, buf_size);
				result = parameter_flashfs_write(parameters_token, buffer, buf_size);
				result = result == buf_size ? OK : -EFBIG;

			}

			free(enc_buff);
		}
	}

	return result;
}