add pkgconfig support for json-c

this includes a fallback for legacy support

CMakeLists.txt

@@ -12,6 +12,13 @@ IF(APPLE)
   LINK_DIRECTORIES(/opt/local/lib)
 ENDIF()
 
+INCLUDE(FindPkgConfig)
+PKG_CHECK_MODULES(JSONC json)
+IF(JSONC_FOUND)
+  ADD_DEFINITIONS(-DJSONC)
+  INCLUDE_DIRECTORIES(${JSONC_INCLUDE_DIRS})
+ENDIF()
+
 SET(SOURCES avl.c avl-cmp.c blob.c blobmsg.c uloop.c usock.c ustream.c ustream-fd.c vlist.c utils.c)
 
 ADD_LIBRARY(ubox SHARED ${SOURCES})

blobmsg_json.h

@@ -16,7 +16,12 @@
 #ifndef __BLOBMSG_JSON_H
 #define __BLOBMSG_JSON_H
 
+#ifdef JSONC
+	#include <json.h>
+#else
 	#include <json/json.h>
+#endif
+
 #include <stdbool.h>
 #include "blobmsg.h"
 

jshn.c

@@ -13,7 +13,12 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
+#ifdef JSONC
+        #include <json.h>
+#else
         #include <json/json.h>
+#endif
+
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>