mango/obj/set.c

#include <socks/object.h>

struct set {
	struct queue s_list;
	char s_name[OBJECT_NAME_MAX];
};

static kern_status_t set_query_name(struct object *obj, char out[OBJECT_NAME_MAX])
{
	struct set *set = object_data(obj);
	strncpy(out, set->s_name, OBJECT_NAME_MAX - 1);
	out[OBJECT_NAME_MAX - 1] = 0;
	
	return KERN_OK;
}

static kern_status_t set_get_child_at(struct object *obj, size_t at, struct object **out)
{
	struct set *set = object_data(obj);
	size_t i = 0;
	queue_foreach(struct object, child, &set->s_list, ob_list) {
		if (i == at) {
			*out = object_ref(child);
			return KERN_OK;
		}

		i++;
	}
	
	return KERN_NO_ENTRY;
}

static kern_status_t set_get_child_named(struct object *obj, const char *name, struct object **out)
{
	struct set *set = object_data(obj);
	char child_name[OBJECT_NAME_MAX];
	
	queue_foreach(struct object, child, &set->s_list, ob_list) {
		kern_status_t status = object_query_name(child, child_name);
		if (status != KERN_OK) {
			continue;
		}

		if (!strcmp(child_name, name)) {
			*out = object_ref(child);
			return KERN_OK;
		}
	}
	
	return KERN_NO_ENTRY;
}

static struct object_type set_type = {
	.ob_name = "set",
	.ob_size = sizeof(struct set),
	.ob_ops = {
		.query_name = set_query_name,
		.get_named = set_get_child_named,
		.get_at = set_get_child_at,
	},
};

void init_set_objects(void)
{
	object_type_register(&set_type);
}

struct object *set_create(const char *name)
{
	struct object *set_obj = object_create(&set_type);
	if (!set_obj) {
		return NULL;
	}

	struct set *set = object_data(set_obj);
	set->s_list = QUEUE_INIT;
	strncpy(set->s_name, name, sizeof set->s_name - 1);
	set->s_name[sizeof set->s_name - 1] = 0;

	return set_obj;
}

kern_status_t set_add_object(struct object *set_obj, struct object *obj)
{
	if (!object_is_set(set_obj)) {
		return KERN_INVALID_ARGUMENT;
	}
	
	struct set *set = object_data(set_obj);

	char child_name[OBJECT_NAME_MAX];
	char obj_name[OBJECT_NAME_MAX];
	
	kern_status_t status = object_query_name(obj, obj_name);
	if (status != KERN_OK) {
		return status;
	}

	queue_foreach (struct object, child, &set->s_list, ob_list) {
		object_query_name(child, child_name);

		if (!strcmp(child_name, obj_name)) {
			return KERN_NAME_EXISTS;
		}
	}

	object_ref(obj);
	queue_push_back(&set->s_list, &obj->ob_list);
	return KERN_OK;
}

kern_status_t set_remove_object(struct object *set_obj, struct object *obj)
{
	if (!object_is_set(set_obj)) {
		return KERN_INVALID_ARGUMENT;
	}
	
	struct set *set = object_data(set_obj);
	queue_delete(&set->s_list, &obj->ob_list);
	object_deref(obj);

	return KERN_OK;
}

bool object_is_set(struct object *obj)
{
	return obj->ob_type == &set_type;
}