ext/json: backward compatibilities

* ext/json/fbuffer/fbuffer.h, ext/json/generator/generator.c: add
  macros for backward compatibilities.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44615 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 11 insertions, 2 deletions

diff --git a/ext/json/fbuffer/fbuffer.h b/ext/json/fbuffer/fbuffer.h
index af74187566..1e860eb790 100644
--- a/ext/json/fbuffer/fbuffer.h
+++ b/ext/json/fbuffer/fbuffer.h
@@ -25,6 +25,15 @@
 #define RSTRING_LEN(string) RSTRING(string)->len
 #endif
 
+#ifdef PRIsVALUE
+# define RB_OBJ_CLASSNAME(obj) rb_obj_class(obj)
+# define RB_OBJ_STRING(obj) (obj)
+#else
+# define PRIsVALUE "s"
+# define RB_OBJ_CLASSNAME(obj) rb_obj_classname(obj)
+# define RB_OBJ_STRING(obj) StringValueCStr(obj)
+#endif
+
 #ifdef HAVE_RUBY_ENCODING_H
 #include "ruby/encoding.h"
 #define FORCE_UTF8(obj) rb_enc_associate((obj), rb_utf8_encoding())
diff --git a/ext/json/generator/generator.c b/ext/json/generator/generator.c
index ed7bb82887..06509ca93f 100644
--- a/ext/json/generator/generator.c
+++ b/ext/json/generator/generator.c
@@ -812,10 +812,10 @@ static void generate_json_float(FBuffer *buffer, VALUE Vstate, JSON_Generator_St
     if (!allow_nan) {
         if (isinf(value)) {
             fbuffer_free(buffer);
-            rb_raise(eGeneratorError, "%u: %s not allowed in JSON", __LINE__, StringValueCStr(tmp));
+            rb_raise(eGeneratorError, "%u: %"PRIsVALUE" not allowed in JSON", __LINE__, RB_OBJ_STRING(tmp));
         } else if (isnan(value)) {
             fbuffer_free(buffer);
-            rb_raise(eGeneratorError, "%u: %s not allowed in JSON", __LINE__, StringValueCStr(tmp));
+            rb_raise(eGeneratorError, "%u: %"PRIsVALUE" not allowed in JSON", __LINE__, RB_OBJ_STRING(tmp));
         }
     }
     fbuffer_append_str(buffer, tmp);