lib: implement '%J' printf format

The `%J` format allows outputting values as valid JSON string.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/ast.h b/ast.h
index c6d5aeb..92e021e 100644
--- a/ast.h
+++ b/ast.h
@@ -27,6 +27,8 @@
 	#include <json-c/json.h>
 #endif
 
+#define JSON_C_TO_STRING_STRICT (1<<31)
+
 #define UT_ERRMSG_OOM "Runtime error: Memory allocation failure"
 
 enum ut_error_type {