add tag v1_8_5_91v1_8_5_91

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_8_5_91@13046 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 65 insertions, 0 deletions

diff --git a/ruby_1_8_5/missing/isinf.c b/ruby_1_8_5/missing/isinf.c
new file mode 100644
index 0000000000..e44ef6c3c1
--- /dev/null
+++ b/ruby_1_8_5/missing/isinf.c
@@ -0,0 +1,65 @@
+/* public domain rewrite of isinf(3) */
+
+#ifdef __osf__
+
+#define _IEEE 1
+#include <nan.h>
+
+int
+isinf(n)
+    double n;
+{
+    if (IsNANorINF(n) && IsINF(n)) {
+	return 1;
+    }
+    else {
+	return 0;
+    }
+}
+
+#else
+
+#include "config.h"
+
+#if defined(HAVE_FINITE) && defined(HAVE_ISNAN)
+
+#include <math.h>
+#ifdef HAVE_IEEEFP_H
+#include <ieeefp.h>
+#endif
+
+int
+isinf(n)
+    double n;
+{
+    return (!finite(n) && !isnan(n));
+}
+
+#else
+
+#ifdef HAVE_STRING_H
+# include <string.h>
+#else
+# include <strings.h>
+#endif
+
+static double zero()	{ return 0.0; }
+static double one()	{ return 1.0; }
+static double inf()	{ return one() / zero(); }
+
+int
+isinf(n)
+    double n;
+{
+    static double pinf = 0.0;
+    static double ninf = 0.0;
+
+    if (pinf == 0.0) {
+	pinf = inf();
+	ninf = -pinf;
+    }
+    return memcmp(&n, &pinf, sizeof n) == 0
+	|| memcmp(&n, &ninf, sizeof n) == 0;
+}
+#endif
+#endif