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git.proxmox.com Git - mirror_ovs.git/blob - lib/shash.c
2 * Copyright (c) 2009 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
23 hash_name(const char *name
)
25 return hash_string(name
, 0);
29 shash_init(struct shash
*sh
)
35 shash_destroy(struct shash
*sh
)
39 hmap_destroy(&sh
->map
);
44 shash_clear(struct shash
*sh
)
46 struct shash_node
*node
, *next
;
48 SHASH_FOR_EACH_SAFE (node
, next
, sh
) {
49 hmap_remove(&sh
->map
, &node
->node
);
56 shash_is_empty(const struct shash
*shash
)
58 return hmap_is_empty(&shash
->map
);
61 /* It is the caller's responsibility to avoid duplicate names, if that is
64 shash_add(struct shash
*sh
, const char *name
, void *data
)
66 struct shash_node
*node
= xmalloc(sizeof *node
);
67 node
->name
= xstrdup(name
);
69 hmap_insert(&sh
->map
, &node
->node
, hash_name(name
));
74 shash_delete(struct shash
*sh
, struct shash_node
*node
)
76 hmap_remove(&sh
->map
, &node
->node
);
81 /* If there are duplicates, returns a random element. */
83 shash_find(const struct shash
*sh
, const char *name
)
85 struct shash_node
*node
;
87 HMAP_FOR_EACH_WITH_HASH (node
, struct shash_node
, node
,
88 hash_name(name
), &sh
->map
) {
89 if (!strcmp(node
->name
, name
)) {
97 shash_find_data(const struct shash
*sh
, const char *name
)
99 struct shash_node
*node
= shash_find(sh
, name
);
100 return node
? node
->data
: NULL
;
104 shash_first(const struct shash
*shash
)
106 struct hmap_node
*node
= hmap_first(&shash
->map
);
107 return node
? CONTAINER_OF(node
, struct shash_node
, node
) : NULL
;