lib/smap.h

   1 /* Copyright (c) 2012, 2014, 2015 Nicira, Inc.
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.  */
  14
  15 #ifndef SMAP_H
  16 #define SMAP_H 1
  17
  18 #include "hmap.h"
  19
  20 struct json;
  21 struct uuid;
  22
  23 /* A map from string to string. */
  24 struct smap {
  25     struct hmap map;           /* Contains "struct smap_node"s. */
  26 };
  27
  28 struct smap_node {
  29     struct hmap_node node;     /* In struct smap's 'map' hmap. */
  30     char *key;
  31     char *value;
  32 };
  33
  34 #define SMAP_INITIALIZER(SMAP) { HMAP_INITIALIZER(&(SMAP)->map) }
  35
  36 #define SMAP_FOR_EACH(SMAP_NODE, SMAP) \
  37     HMAP_FOR_EACH (SMAP_NODE, node, &(SMAP)->map)
  38
  39 #define SMAP_FOR_EACH_SAFE(SMAP_NODE, NEXT, SMAP) \
  40     HMAP_FOR_EACH_SAFE (SMAP_NODE, NEXT, node, &(SMAP)->map)
  41
  42 /* Initializer for an immutable struct smap 'SMAP' that contains a single
  43  * 'KEY'-'VALUE' pair, e.g.
  44  *
  45  *     const struct smap smap = SMAP1_CONST1(&smap, "key", "value");
  46  *
  47  * An smap initialized this way must not be modified or destroyed.
  48  *
  49  * The 'KEY' argument is evaluated multiple times.
  50  */
  51 #define SMAP_CONST1(SMAP, KEY, VALUE) {                                 \
  52         HMAP_CONST1(&(SMAP)->map,                                       \
  53                    (&(struct smap_node) SMAP_NODE_INIT(KEY, VALUE).node)) \
  54             }
  55 #define SMAP_NODE_INIT(KEY, VALUE) {                \
  56         HMAP_NODE_INIT(hash_string(KEY, 0)),        \
  57                        CONST_CAST(char *, KEY),     \
  58                        CONST_CAST(char *, VALUE) }
  59
  60
  61 void smap_init(struct smap *);
  62 void smap_destroy(struct smap *);
  63
  64 struct smap_node *smap_add(struct smap *, const char *, const char *);
  65 struct smap_node *smap_add_nocopy(struct smap *, char *, char *);
  66 bool smap_add_once(struct smap *, const char *, const char *);
  67 void smap_add_format(struct smap *, const char *key, const char *, ...)
  68     OVS_PRINTF_FORMAT(3, 4);
  69 void smap_replace(struct smap *, const char *, const char *);
  70
  71 void smap_remove(struct smap *, const char *);
  72 void smap_remove_node(struct smap *, struct smap_node *);
  73 void smap_steal(struct smap *, struct smap_node *, char **keyp, char **valuep);
  74 void smap_clear(struct smap *);
  75
  76 const char *smap_get(const struct smap *, const char *);
  77 struct smap_node *smap_get_node(const struct smap *, const char *);
  78 bool smap_get_bool(const struct smap *smap, const char *key, bool def);
  79 int smap_get_int(const struct smap *smap, const char *key, int def);
  80 bool smap_get_uuid(const struct smap *, const char *key, struct uuid *);
  81
  82 bool smap_is_empty(const struct smap *);
  83 size_t smap_count(const struct smap *);
  84
  85 void smap_clone(struct smap *dst, const struct smap *src);
  86 const struct smap_node **smap_sort(const struct smap *);
  87
  88 void smap_from_json(struct smap *, const struct json *);
  89 struct json *smap_to_json(const struct smap *);
  90
  91 bool smap_equal(const struct smap *, const struct smap *);
  92
  93 #endif /* smap.h */