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dict: Add lif_dict_add_once()

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Add a function to add a key/value pair to the dict only if it doesn't exist
  within the dict already.

  As the dict is type agnostic this requires a comparator function to be given.

Signed-off-by: Maximilian Wilhelm <max@sdn.clinic>
This commit is contained in:
Maximilian Wilhelm 2020-07-28 22:44:22 +02:00
parent b1dfa609f9
commit f51c976b52
2 changed files with 26 additions and 0 deletions
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25
libifupdown/dict.c
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@ -50,6 +50,31 @@ lif_dict_add(struct lif_dict *dict, const char *key, void *data)
return entry;
}
struct lif_dict_entry *
lif_dict_add_once(struct lif_dict *dict, const char *key, void *data,
int (*compar)(const void *, const void *))
{
struct lif_list *existing = lif_dict_find_all(dict, key);
if (existing)
{
struct lif_node *iter;
LIF_LIST_FOREACH(iter, existing->head)
{
if (!compar(data, iter->data))
return NULL;
}
}
struct lif_dict_entry *entry = calloc(1, sizeof *entry);
entry->key = strdup(key);
entry->data = data;
lif_node_insert_tail(&entry->node, entry, &dict->list);
return entry;
}
struct lif_dict_entry *
lif_dict_find(struct lif_dict *dict, const char *key)
{

1
libifupdown/dict.h
View file

@ -38,6 +38,7 @@ struct lif_dict_entry {
extern void lif_dict_init(struct lif_dict *dict);
extern void lif_dict_fini(struct lif_dict *dict);
extern struct lif_dict_entry *lif_dict_add(struct lif_dict *dict, const char *key, void *data);
extern struct lif_dict_entry *lif_dict_add_once(struct lif_dict *dict, const char *key, void *data, int (*compar)(const void *, const void *));
extern struct lif_dict_entry *lif_dict_find(struct lif_dict *dict, const char *key);
extern struct lif_list *lif_dict_find_all(struct lif_dict *dict, const char *key);
extern void lif_dict_delete(struct lif_dict *dict, const char *key);