buffer: allow JSON indention

include/villas/buffer.hpp

@@ -48,7 +48,7 @@ public:
 
 	int parseJson(json_t **j);
 
-	int appendJson(json_t *j);
+	int appendJson(json_t *j, int flags = JSON_INDENT(4));
 };
 
 } /* namespace villas */

include/villas/json_buffer.hpp

@@ -39,7 +39,7 @@ protected:
 
 public:
 	/** Encode JSON document /p j and append it to the buffer */
-	int encode(json_t *j);
+	int encode(json_t *j, int flags = JSON_INDENT(4));
 
 	/** Decode JSON document from the beginning of the buffer */
 	json_t * decode();

lib/buffer.cpp

@@ -75,11 +75,11 @@ int Buffer::parseJson(json_t **j)
 	return 0;
 }
 
-int Buffer::appendJson(json_t *j)
+int Buffer::appendJson(json_t *j, int flags)
 {
 	size_t l;
 
-retry:	l = json_dumpb(j, buf + len, size - len, 0);
+retry:	l = json_dumpb(j, buf + len, size - len, flags);
 	if (size < len + l) {
 		buf = (char *) realloc(buf, len + l);
 		if (!buf)

lib/json_buffer.cpp

@@ -40,9 +40,9 @@ json_t * JsonBuffer::decode()
 	return j;
 }
 
-int JsonBuffer::encode(json_t *j)
+int JsonBuffer::encode(json_t *j, int flags)
 {
-	return json_dump_callback(j, callback, this, 0);
+	return json_dump_callback(j, callback, this, flags);
 }
 
 int JsonBuffer::callback(const char *data, size_t len, void *ctx)