PR#331: for Visual Studio, use a snprintf/vsnprintf wrapper that ensures the string is terminated.

json_object.c

@@ -31,13 +31,7 @@
 #include "json_util.h"
 #include "math_compat.h"
 #include "strdup_compat.h"
-
-#if !defined(HAVE_SNPRINTF) && defined(_MSC_VER)
-  /* MSC has the version as _snprintf */
-# define snprintf _snprintf
-#elif !defined(HAVE_SNPRINTF)
-# error You do not have snprintf on your system.
-#endif /* HAVE_SNPRINTF */
+#include "snprintf_compat.h"
 
 // Don't define this.  It's not thread-safe.
 /* #define REFCOUNT_DEBUG 1 */