1 files changed, 84 insertions, 0 deletions
diff --git a/src/devtools/getref.c b/src/devtools/getref.c
new file mode 100644
index 00000000..9e829dd5
--- /dev/null
+++ b/src/devtools/getref.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2016, 2017, 2018 "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.
+ */
+/*
+ * This simple program expands the object { "$ref": "#/path/to/a/target" }
+ *
+ * For example:
+ *
+ *  {
+ *    "type":{
+ *      "a": "int",
+ *      "b": { "$ref": "#/type/a" }
+ *    }
+ *  }
+ *
+ * will be exapanded to
+ *
+ *  {
+ *    "type":{
+ *      "a": "int",
+ *      "b": "int"
+ *    }
+ *  }
+ *
+ * Invocation:   program  [file|-]...
+ *
+ * without arguments, it reads the input.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <string.h>
+
+#include <json-c/json.h>
+
+#include "getref.h"
+
+/**
+ * Search for a reference of type "#/a/b/c" int the
+ * parsed JSON root object
+ */
+int search$ref(struct json_object *root, const char *ref, struct json_object **result)
+{
+	char *d;
+	struct json_object *i;
+
+	/* does it match #/ at the beginning? */
+	if (ref[0] != '#' || (ref[0] && ref[1] != '/')) {
+		fprintf(stderr, "$ref invalid. Was: %s", ref);
+		return 0;
+	}
+
+	/* search from root to target */
+	i = root;
+	d = strdupa(ref+2);
+	d = strtok(d, "/");
+	while(i && d) {
+		if (!json_object_object_get_ex(i, d, &i))
+			return 0;
+		d = strtok(NULL, "/");
+	}
+	if (result)
+		*result = i;
+	return 1;
+}
+
+struct json_object *get$ref(struct json_object *root, const char *ref)
+{
+	struct json_object *result;
+	return search$ref(root, ref, &result) ? result : NULL;
+}