kvlist.h

   1 /*
   2  * kvlist - simple key/value store
   3  *
   4  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #ifndef __LIBUBOX_KVLIST_H
  19 #define __LIBUBOX_KVLIST_H
  20
  21 #include "avl.h"
  22
  23 struct kvlist {
  24         struct avl_tree avl;
  25
  26         int (*get_len)(struct kvlist *kv, void *data);
  27 };
  28
  29 struct kvlist_node {
  30         struct avl_node avl;
  31
  32         char data[0] __attribute__((aligned(4)));
  33 };
  34
  35 #define __ptr_to_kv(_ptr) container_of(((char *) (_ptr)), struct kvlist_node, data[0])
  36 #define __avl_list_to_kv(_l) container_of(_l, struct kvlist_node, avl.list)
  37
  38 #define kvlist_for_each(kv, name, value) \
  39         for (value = (void *) __avl_list_to_kv((kv)->avl.list_head.next)->data,                 \
  40              name = (const char *) __ptr_to_kv(value)->avl.key, (void) name;                    \
  41              &__ptr_to_kv(value)->avl.list != &(kv)->avl.list_head;                             \
  42              value = (void *) (__avl_list_to_kv(__ptr_to_kv(value)->avl.list.next))->data,      \
  43              name = (const char *) __ptr_to_kv(value)->avl.key)
  44
  45 void kvlist_init(struct kvlist *kv, int (*get_len)(struct kvlist *kv, void *data));
  46 void kvlist_free(struct kvlist *kv);
  47 void *kvlist_get(struct kvlist *kv, const char *name);
  48 void kvlist_set(struct kvlist *kv, const char *name, void *data);
  49 bool kvlist_delete(struct kvlist *kv, const char *name);
  50
  51 int kvlist_strlen(struct kvlist *kv, void *data);
  52 int kvlist_blob_len(struct kvlist *kv, void *data);
  53
  54 #endif