kvlist: add a simply key/value store implementation

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

1 files changed, 96 insertions, 0 deletions

diff --git a/kvlist.c b/kvlist.c
new file mode 100644
index 0000000..4f56a38
--- /dev/null
+++ b/kvlist.c
@@ -0,0 +1,96 @@
+/*
+ * kvlist - simple key/value store
+ *
+ * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#include <stdlib.h>
+#include <string.h>
+
+#include "utils.h"
+#include "avl-cmp.h"
+#include "blob.h"
+
+#include "kvlist.h"
+
+int kvlist_strlen(struct kvlist *kv, void *data)
+{
+	return strlen(data) + 1;
+}
+
+int kvlist_blob_len(struct kvlist *kv, void *data)
+{
+	return blob_pad_len(data);
+}
+
+void kvlist_init(struct kvlist *kv, int (*get_len)(struct kvlist *kv, void *data))
+{
+	avl_init(&kv->avl, avl_strcmp, false, NULL);
+	kv->get_len = get_len;
+}
+
+static struct kvlist_node *__kvlist_get(struct kvlist *kv, const char *name)
+{
+	struct kvlist_node *node;
+
+	return avl_find_element(&kv->avl, name, node, avl);
+}
+
+void *kvlist_get(struct kvlist *kv, const char *name)
+{
+	struct kvlist_node *node;
+
+	node = __kvlist_get(kv, name);
+	if (!node)
+		return NULL;
+
+	return node->data;
+}
+
+bool kvlist_delete(struct kvlist *kv, const char *name)
+{
+	struct kvlist_node *node;
+
+	node = __kvlist_get(kv, name);
+	if (node) {
+		avl_delete(&kv->avl, &node->avl);
+		free(node);
+	}
+
+	return !!node;
+}
+
+void kvlist_set(struct kvlist *kv, const char *name, void *data)
+{
+	struct kvlist_node *node;
+	char *name_buf;
+	int len = kv->get_len(kv, data);
+
+	kvlist_delete(kv, name);
+
+	node = calloc_a(sizeof(struct kvlist_node) + len,
+		&name_buf, strlen(name) + 1);
+	memcpy(node->data, data, len);
+
+	node->avl.key = strcpy(name_buf, name);
+	avl_insert(&kv->avl, &node->avl);
+}
+
+void kvlist_free(struct kvlist *kv)
+{
+	struct kvlist_node *node, *tmp;
+
+	avl_remove_all_elements(&kv->avl, node, avl, tmp)
+		free(node);
+}