From 363b0bddde815a459f04e1d167d56bd1f498275c Mon Sep 17 00:00:00 2001
From: usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 19 Jun 2008 07:51:46 +0000
Subject: 	* missing/acosh.c (atanh): should set ERANGE to errno if
 parameter 	  is the boundary case. fixed [ruby-dev:35155]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@17425 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 missing/acosh.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'missing')

diff --git a/missing/acosh.c b/missing/acosh.c
index 41add2e4b6..c6695b599e 100644
--- a/missing/acosh.c
+++ b/missing/acosh.c
@@ -12,6 +12,7 @@
 #include <errno.h>
 #include <float.h>
 #include <math.h>
+#include "ruby.h"
 
 /* DBL_MANT_DIG must be less than 4 times of bits of int */
 #ifndef DBL_MANT_DIG
@@ -79,6 +80,14 @@ atanh(double x)
     if (z < SMALL_CRITERIA) return x;
     z = log(z > 1 ? -1 : (1 + z) / (1 - z)) / 2;
     if (neg) z = -z;
+    if (isinf(z))
+#if defined(ERANGE)
+	errno = ERANGE;
+#elif defined(EDOM)
+	errno = EDOM;
+#else
+	;
+#endif
     return z;
 }
 #endif
-- 
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