From e6e364088ac5c980e3fb99300ba74cc26296000b Mon Sep 17 00:00:00 2001
From: "Marc G. Fournier" <scrappy@hub.org>
Date: Mon, 2 Feb 1998 00:04:08 +0000
Subject: Move all the isinf() stuff from float.c to isinf.c, and build it
 according to configure vs port specific #ifdef's...

---
 src/backend/port/isinf.c | 60 +++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 54 insertions(+), 6 deletions(-)

(limited to 'src/backend/port/isinf.c')

diff --git a/src/backend/port/isinf.c b/src/backend/port/isinf.c
index ca5d22bfe5e..6e9d83e600b 100644
--- a/src/backend/port/isinf.c
+++ b/src/backend/port/isinf.c
@@ -1,15 +1,63 @@
-/* $Id: isinf.c,v 1.1 1998/01/15 20:54:37 scrappy Exp $ */
+/* $Id: isinf.c,v 1.2 1998/02/02 00:03:46 scrappy Exp $ */
 
-#include <ieeefp.h>
 #include <math.h>  
-
 #include "config.h"
 
+#if HAVE_FPCLASS
+#  if HAVE_IEEEFP_H
+#    include <ieeefp.h>
+#  endif
+int
+isinf(double d)
+{
+	fpclass_t       type = fpclass(d);
+
+	switch (type)
+	{
+		case FP_SNAN:
+		case FP_QNAN:
+		case FP_NINF:
+		case FP_PINF:
+			return (1);
+		default:
+			break;
+	}
+	return (0);
+}
+#endif
 
+#if defined(HAVE_FP_CLASS) || defined(HAVE_FP_CLASS_D)
+#  if HAVE_FP_CLASS_H
+#    include <fp_class.h>
+#  endif
+int      
+isinf(x)         
+double          x;
+{               
+#if HAVE_FP_CLASS
+	int	fpclass = fp_class(x);
+#else
+	int	fpclass = fp_class_d(x);
+#endif
+ 
+	if (fpclass == FP_POS_INF)   
+		return (1); 
+	if (fpclass == FP_NEG_INF)
+		return (-1);
+	return (0);
+}
+#endif
+
+#if defined(HAVE_CLASS)
 int
 isinf(double x)
 {
-	if((fpclass(x) == FP_PINF) || (fpclass(x) == FP_NINF)) return 1;
-	else return 0;
-}
+	int	fpclass = class(x);
 
+	if (fpclass == FP_PLUS_INF)
+		return (1);
+	if (fpclass == FP_MINUS_INF)
+		return (-1);
+	return (0);
+}
+#endif
-- 
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