Add simple chained management lib

Change-Id: I9aa2e5c4da375a124a6be43d5738414b80e0567e
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

3 files changed, 135 insertions, 0 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index c83a11b..7c8c2b4 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -27,6 +27,7 @@ PROJECT_TARGET_ADD(harvester)
 		plugins/influxdb.c
 		plugins/influxdb-writer.c
 		plugins/influxdb-reader.c
+		utils/list.c
 	)
 
 	set(OPENAPI_DEF "harvester-apidef" CACHE STRING "name and path to the JSON API definition without extension")
diff --git a/src/utils/list.c b/src/utils/list.c
new file mode 100644
index 0000000..da97e42
--- /dev/null
+++ b/src/utils/list.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2018 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *	 http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "list.h"
+#include "string.h"
+
+void destroy_list(struct list *l)
+{
+	struct list *save;
+	while(l != NULL) {
+		save = l->next;
+		free(l);
+		l = save;
+	}
+}
+
+void add_elt(struct list *l, const char *key, json_object *value)
+{
+	struct list *new_elt = malloc(sizeof(struct list));
+	new_elt->key = key;
+	new_elt->value = value;
+	new_elt->next = NULL;
+
+	if(l) {
+		while(l->next != NULL) {
+			l = l->next;
+		}
+		l->next = new_elt;
+	}
+	else {
+		l = new_elt;
+	}
+}
+
+void add_key(struct list *l, const char *key)
+{
+	struct list *new_elt = malloc(sizeof(struct list));
+	new_elt->key = key;
+	new_elt->value = NULL;
+	new_elt->next = NULL;
+
+	if(l) {
+		while(l->next != NULL) {
+			l = l->next;
+		}
+		l->next = new_elt;
+	}
+	else {
+		l = new_elt;
+	}
+}
+
+struct list *get_elt(struct list *l, int index)
+{
+	int i;
+
+	for (i = 0; i < index; i++) {
+		l = l->next;
+		if ( l == NULL )
+			return NULL;
+	}
+
+	return l;
+}
+
+struct list *find_elt_from_key(struct list *l, const char *key)
+{
+	while(l != NULL) {
+		if(strcasecmp(l->key, key) == 0)
+			return l;
+		l = l->next;
+	}
+	return NULL;
+}
+
+json_object *find_key_value(struct list *l, const char *key)
+{
+	while(l != NULL) {
+		if(strcasecmp(l->key, key) == 0)
+			return l->value;
+		l = l->next;
+	}
+	return NULL;
+}
diff --git a/src/utils/list.h b/src/utils/list.h
new file mode 100644
index 0000000..dcb01bd
--- /dev/null
+++ b/src/utils/list.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2018 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *	 http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef _LIST_H_
+#define _LIST_H_
+
+#include <stdlib.h>
+#include <json-c/json.h>
+
+struct list {
+	const char *key;
+	json_object *value;
+	struct list *next;
+};
+
+void destroy_list(struct list *l);
+void add_elt(struct list *l, const char *key, json_object *value);
+void add_key(struct list *l, const char *key);
+struct list *get_elt(struct list *l, int index);
+struct list *find_elt_from_key(struct list *l, const char *key);
+json_object *find_key_value(struct list *l, const char *key);
+
+#endif