Totally rework the math library, this time based on the MacOs X

math library (which is itself based on the math lib from FreeBSD).
 -Erik

1 files changed, 62 insertions, 0 deletions

diff --git a/libm/w_scalb.c b/libm/w_scalb.c
new file mode 100644
index 000000000..bde5f705a
--- /dev/null
+++ b/libm/w_scalb.c
@@ -0,0 +1,62 @@
+#if !defined(__ppc__)
+/* @(#)w_scalb.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice 
+ * is preserved.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: w_scalb.c,v 1.6 1995/05/10 20:49:48 jtc Exp $";
+#endif
+
+/*
+ * wrapper scalb(double x, double fn) is provide for
+ * passing various standard test suite. One 
+ * should use scalbn() instead.
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#include <errno.h>
+
+#ifdef __STDC__
+#ifdef _SCALB_INT
+	double scalb(double x, int fn)		/* wrapper scalb */
+#else
+	double scalb(double x, double fn)	/* wrapper scalb */
+#endif
+#else
+	double scalb(x,fn)			/* wrapper scalb */
+#ifdef _SCALB_INT
+	double x; int fn;
+#else
+	double x,fn;
+#endif
+#endif
+{
+#ifdef _IEEE_LIBM
+	return __ieee754_scalb(x,fn);
+#else
+	double z;
+	z = __ieee754_scalb(x,fn);
+	if(_LIB_VERSION == _IEEE_) return z;
+	if(!(finite(z)||isnan(z))&&finite(x)) {
+	    return __kernel_standard(x,(double)fn,32); /* scalb overflow */
+	}
+	if(z==0.0&&z!=x) {
+	    return __kernel_standard(x,(double)fn,33); /* scalb underflow */
+	} 
+#ifndef _SCALB_INT
+	if(!finite(fn)) errno = ERANGE;
+#endif
+	return z;
+#endif 
+}
+#endif /* !__ppc__ */