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-cmp.h"
  22 #include "avl.h"
  23
  24 struct kvlist {
  25         struct avl_tree avl;
  26
  27         int (*get_len)(struct kvlist *kv, const void *data);
  28 };
  29
  30 struct kvlist_node {
  31         struct avl_node avl;
  32
  33         char data[0] __attribute__((aligned(4)));
  34 };
  35
  36 #define KVLIST_INIT(_name, _get_len)                                            \
  37         {                                                                       \
  38                 .avl = AVL_TREE_INIT(_name.avl, avl_strcmp, false, NULL),       \
  39                 .get_len = _get_len                                             \
  40         }
  41
  42 #define KVLIST(_name, _get_len)                                                 \
  43         struct kvlist _name = KVLIST_INIT(_name, _get_len)
  44
  45 #define __ptr_to_kv(_ptr) container_of(((char *) (_ptr)), struct kvlist_node, data[0])
  46 #define __avl_list_to_kv(_l) container_of(_l, struct kvlist_node, avl.list)
  47
  48 #define kvlist_for_each(kv, name, value) \
  49         for (value = (void *) __avl_list_to_kv((kv)->avl.list_head.next)->data,                 \
  50              name = (const char *) __ptr_to_kv(value)->avl.key, (void) name;                    \
  51              &__ptr_to_kv(value)->avl.list != &(kv)->avl.list_head;                             \
  52              value = (void *) (__avl_list_to_kv(__ptr_to_kv(value)->avl.list.next))->data,      \
  53              name = (const char *) __ptr_to_kv(value)->avl.key)
  54
  55 void kvlist_init(struct kvlist *kv, int (*get_len)(struct kvlist *kv, const void *data));
  56 void kvlist_free(struct kvlist *kv);
  57 void *kvlist_get(struct kvlist *kv, const char *name);
  58 bool kvlist_set(struct kvlist *kv, const char *name, const void *data);
  59 bool kvlist_delete(struct kvlist *kv, const char *name);
  60
  61 int kvlist_strlen(struct kvlist *kv, const void *data);
  62 int kvlist_blob_len(struct kvlist *kv, const void *data);
  63
  64 #endif