Adding utils-json

This provides facilities for handling json.

Change-Id: I325d5685ded745721a1801267b9c53beb974385c
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

1 files changed, 101 insertions, 0 deletions

diff --git a/src/utils-json.c b/src/utils-json.c
new file mode 100644
index 0000000..b3bee36
--- /dev/null
+++ b/src/utils-json.c
@@ -0,0 +1,101 @@
+/*
+ Copyright 2015 IoT.bzh
+
+ author: José Bollo <jose.bollo@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 <errno.h>
+
+#include <json.h>
+
+#include "utils-json.h"
+
+int j_object(struct json_object *obj, const char *key, struct json_object **value)
+{
+	return json_object_object_get_ex(obj, key, value);
+}
+
+int j_string(struct json_object *obj, const char *key, const char **value)
+{
+	json_object *data;
+	return j_object(obj, key, &data)
+		&& json_object_get_type(data) == json_type_string
+		&& (*value = json_object_get_string(data)) != NULL;
+}
+
+int j_boolean(struct json_object *obj, const char *key, int *value)
+{
+	json_object *data;
+	return json_object_object_get_ex(obj, key, &data)
+		&& json_object_get_type(data) == json_type_boolean
+		&& ((*value = (int)json_object_get_boolean(data)), 1);
+}
+
+int j_integer(struct json_object *obj, const char *key, int *value)
+{
+	json_object *data;
+	return json_object_object_get_ex(obj, key, &data)
+		&& json_object_get_type(data) == json_type_int
+		&& ((*value = (int)json_object_get_int(data)), 1);
+}
+
+const char *j_get_string(struct json_object *obj, const char *key, const char *defval)
+{
+	struct json_object *o;
+	return json_object_object_get_ex(obj, key, &o)
+		&& json_object_get_type(o) == json_type_string
+			? json_object_get_string(o) : defval;
+}
+
+int j_get_boolean(struct json_object *obj, const char *key, int defval)
+{
+	struct json_object *o;
+	return json_object_object_get_ex(obj, key, &o)
+		&& json_object_get_type(o) == json_type_boolean
+			? json_object_get_boolean(o) : defval;
+}
+
+int j_get_integer(struct json_object *obj, const char *key, int defval)
+{
+	struct json_object *o;
+	return json_object_object_get_ex(obj, key, &o)
+		&& json_object_get_type(o) == json_type_int
+			? json_object_get_int(o) : defval;
+}
+
+int j_add(struct json_object *obj, const char *key, struct json_object *val)
+{
+	json_object_object_add(obj, key, val);
+	return 1;
+}
+
+int j_add_string(struct json_object *obj, const char *key, const char *val)
+{
+	struct json_object *str = json_object_new_string (val);
+	return str ? j_add(obj, key, str) : (errno = ENOMEM, 0);
+}
+
+int j_add_boolean(struct json_object *obj, const char *key, int val)
+{
+	struct json_object *str = json_object_new_boolean (val);
+	return str ? j_add(obj, key, str) : (errno = ENOMEM, 0);
+}
+
+int j_add_integer(struct json_object *obj, const char *key, int val)
+{
+	struct json_object *str = json_object_new_int (val);
+	return str ? j_add(obj, key, str) : (errno = ENOMEM, 0);
+}
+