From 04be8e84db1cf4f8b2a7bc7679eda4336da75d43 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 27 Aug 2021 10:52:02 +0900
Subject: Use C99-defined macros to classify a floating-point number

---
 sprintf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'sprintf.c')

diff --git a/sprintf.c b/sprintf.c
index 5237b8d2c8..f4aa7f6d1d 100644
--- a/sprintf.c
+++ b/sprintf.c
@@ -875,7 +875,7 @@ rb_str_format(int argc, const VALUE *argv, VALUE fmt)
 		double fval;
 
 		fval = RFLOAT_VALUE(rb_Float(val));
-		if (isnan(fval) || isinf(fval)) {
+		if (!isfinite(fval)) {
 		    const char *expr;
 		    int need;
 		    int elen;
-- 
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