libubox/kvlist.h

/*
 * kvlist - simple key/value store
 *
 * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#ifndef __LIBUBOX_KVLIST_H
#define __LIBUBOX_KVLIST_H

#include "avl-cmp.h"
#include "avl.h"

struct kvlist {
	struct avl_tree avl;

	int (*get_len)(struct kvlist *kv, const void *data);
};

struct kvlist_node {
	struct avl_node avl;

	char data[0] __attribute__((aligned(4)));
};

#define KVLIST_INIT(_name, _get_len)						\
	{									\
		.avl = AVL_TREE_INIT(_name.avl, avl_strcmp, false, NULL),	\
		.get_len = _get_len						\
	}

#define KVLIST(_name, _get_len)							\
	struct kvlist _name = KVLIST_INIT(_name, _get_len)

#define __ptr_to_kv(_ptr) container_of(((char *) (_ptr)), struct kvlist_node, data[0])
#define __avl_list_to_kv(_l) container_of(_l, struct kvlist_node, avl.list)

#define kvlist_for_each(kv, name, value) \
	for (value = (void *) __avl_list_to_kv((kv)->avl.list_head.next)->data,			\
	     name = (const char *) __ptr_to_kv(value)->avl.key, (void) name;			\
	     &__ptr_to_kv(value)->avl.list != &(kv)->avl.list_head;				\
	     value = (void *) (__avl_list_to_kv(__ptr_to_kv(value)->avl.list.next))->data,	\
	     name = (const char *) __ptr_to_kv(value)->avl.key)

void kvlist_init(struct kvlist *kv, int (*get_len)(struct kvlist *kv, const void *data));
void kvlist_free(struct kvlist *kv);
void *kvlist_get(struct kvlist *kv, const char *name);
bool kvlist_set(struct kvlist *kv, const char *name, const void *data);
bool kvlist_delete(struct kvlist *kv, const char *name);

int kvlist_strlen(struct kvlist *kv, const void *data);
int kvlist_blob_len(struct kvlist *kv, const void *data);

#endif