added compat.c for adding compatibility with older library versions

include/villas/compat.h

@@ -0,0 +1,11 @@
+/** Compatability for different library versions.
+ *
+ * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
+ * @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
+ *********************************************************************************/
+
+#include <jansson.h>
+
+#if JANSSON_VERSION_HEX < 0x020A00
+size_t json_dumpb(const json_t *json, char *buffer, size_t size, size_t flags);
+#endif

lib/Makefile.inc

@@ -10,6 +10,7 @@ LIB_SRCS = $(addprefix lib/nodes/, file.c cbuilder.c) 		\
               log.c utils.c super_node.c hist.c timing.c pool.c	\
               list.c queue.c memory.c advio.c web.c api.c	\
               plugin.c node_type.c stats.c mapping.c sample_io.c\
+              compat.c						\
            )
 
 LIB_CFLAGS  = $(CFLAGS) -fPIC

lib/api.c

@@ -11,26 +11,6 @@
 #include "log.h"
 #include "config.h"
 
-#if JANSSON_VERSION_HEX < 0x020A00
-size_t json_dumpb(const json_t *json, char *buffer, size_t size, size_t flags)
-{
-	char *str;
-	size_t len;
-
-	str = json_dumps(json, flags);
-	if (!str)
-		return 0;
-	
-	len = strlen(str); // not \0 terminated
-	if (buffer && len <= size)
-		memcpy(buffer, str, len);
-
-	free(str);
-
-	return len;
-}
-#endif
-
 static int api_parse_request(struct api_buffer *b, json_t **req)
 {
 	json_error_t e;

lib/compat.c

@@ -0,0 +1,30 @@
+/** Compatability for different library versions.
+ *
+ * @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
+ * @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
+ *********************************************************************************/
+
+#include <string.h>
+#include <jansson.h>
+
+#include "compat.h"
+
+#if JANSSON_VERSION_HEX < 0x020A00
+size_t json_dumpb(const json_t *json, char *buffer, size_t size, size_t flags)
+{
+	char *str;
+	size_t len;
+
+	str = json_dumps(json, flags);
+	if (!str)
+		return 0;
+	
+	len = strlen(str); // not \0 terminated
+	if (buffer && len <= size)
+		memcpy(buffer, str, len);
+
+	free(str);
+
+	return len;
+}
+#endif