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-rw-r--r--src/dict.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/src/dict.c b/src/dict.c
new file mode 100644
index 0000000..a225081
--- /dev/null
+++ b/src/dict.c
@@ -0,0 +1,127 @@
+#include <string.h>
+
+#include <import/eb32tree.h>
+#include <import/ebistree.h>
+#include <haproxy/dict.h>
+#include <haproxy/thread.h>
+
+struct dict *new_dict(const char *name)
+{
+ struct dict *dict;
+
+ dict = malloc(sizeof *dict);
+ if (!dict)
+ return NULL;
+
+ dict->name = name;
+ dict->values = EB_ROOT_UNIQUE;
+ HA_RWLOCK_INIT(&dict->rwlock);
+
+ return dict;
+}
+
+/*
+ * Allocate a new dictionary entry with <s> as string value which is strdup()'ed.
+ * Returns the new allocated entry if succeeded, NULL if not.
+ */
+static struct dict_entry *new_dict_entry(char *s)
+{
+ struct dict_entry *de;
+
+ de = calloc(1, sizeof *de);
+ if (!de)
+ return NULL;
+
+ de->value.key = strdup(s);
+ if (!de->value.key)
+ goto err;
+
+ de->len = strlen(s);
+ de->refcount = 1;
+
+ return de;
+
+ err:
+ ha_free(&de->value.key);
+ de->len = 0;
+ free(de);
+ return NULL;
+}
+
+/*
+ * Release the memory allocated for <de> dictionary entry.
+ */
+static void free_dict_entry(struct dict_entry *de)
+{
+ de->refcount = 0;
+ ha_free(&de->value.key);
+ free(de);
+}
+
+/*
+ * Simple function to lookup dictionary entries with <s> as value.
+ */
+static struct dict_entry *__dict_lookup(struct dict *d, const char *s)
+{
+ struct dict_entry *de;
+ struct ebpt_node *node;
+
+ de = NULL;
+ node = ebis_lookup(&d->values, s);
+ if (node)
+ de = container_of(node, struct dict_entry, value);
+
+ return de;
+}
+
+/*
+ * Insert an entry in <d> dictionary with <s> as value. *
+ */
+struct dict_entry *dict_insert(struct dict *d, char *s)
+{
+ struct dict_entry *de;
+ struct ebpt_node *n;
+
+ HA_RWLOCK_RDLOCK(DICT_LOCK, &d->rwlock);
+ de = __dict_lookup(d, s);
+ HA_RWLOCK_RDUNLOCK(DICT_LOCK, &d->rwlock);
+ if (de) {
+ HA_ATOMIC_INC(&de->refcount);
+ return de;
+ }
+
+ de = new_dict_entry(s);
+ if (!de)
+ return NULL;
+
+ HA_RWLOCK_WRLOCK(DICT_LOCK, &d->rwlock);
+ n = ebis_insert(&d->values, &de->value);
+ HA_RWLOCK_WRUNLOCK(DICT_LOCK, &d->rwlock);
+ if (n != &de->value) {
+ free_dict_entry(de);
+ de = container_of(n, struct dict_entry, value);
+ }
+
+ return de;
+}
+
+
+/*
+ * Unreference a dict entry previously acquired with <dict_insert>.
+ * If this is the last live reference to the entry, it is
+ * removed from the dictionary.
+ */
+void dict_entry_unref(struct dict *d, struct dict_entry *de)
+{
+ if (!de)
+ return;
+
+ if (HA_ATOMIC_SUB_FETCH(&de->refcount, 1) != 0)
+ return;
+
+ HA_RWLOCK_WRLOCK(DICT_LOCK, &d->rwlock);
+ ebpt_delete(&de->value);
+ HA_RWLOCK_WRUNLOCK(DICT_LOCK, &d->rwlock);
+
+ free_dict_entry(de);
+}