* math.c (domain_check): check errno first.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26335 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Sun Jan 17 19:24:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* math.c (domain_check): check errno first.
+
 Sun Jan 17 14:24:35 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/iconv/iconv.c (rb_str_derive): use long.

math.c

@@ -27,10 +27,10 @@ extern VALUE rb_to_float(VALUE val);
 static void
 domain_check(double x, double y, const char *msg)
 {
-    if (!isnan(y)) return;
-    else if (isnan(x)) return;
-    else {
-	if (!errno) {
+    if (!errno) {
+	if (!isnan(y)) return;
+	else if (isnan(x)) return;
+	else {
 #if defined(EDOM)
 	    errno = EDOM;
 #else