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+/*	$NetBSD: cproj.c,v 1.3 2010/09/20 17:51:38 christos Exp $	*/
+
+/*-
+ * Copyright (c) 2010 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * imported and modified include for newlib 2010/10/03 
+ * Marco Atzeri <marco_atzeri@yahoo.it>
+ */
+
+/*
+FUNCTION
+        <<cproj>>, <<cprojf>>--- Riemann sphere projection
+ 
+INDEX
+        cproj
+INDEX
+        cprojf
+
+ANSI_SYNOPSIS
+       #include <complex.h>
+       double complex cproj(double complex <[z]>);
+       float complex cprojf(float complex <[z]>);
+
+
+DESCRIPTION
+        These functions compute a projection of <[z]> onto the Riemann 
+        sphere: <[z]> projects to <[z]> except that all complex infinities 
+        (even those with one infinite part and one NaN part) project 
+        to positive infinity on the real axis. If <[z]> has an infinite part,
+        then <<cproj>>(<[z]>) is equivalent to
+
+                 INFINITY + I * copysign(0.0, cimag(z))
+
+        <<cprojf>> is identical to <<cproj>>, except that it performs
+        its calculations on <<floats complex>>.
+
+RETURNS
+        The cproj functions return the value of the projection onto 
+        the Riemann sphere.
+
+PORTABILITY
+        <<cproj>> and <<cprojf>> are ISO C99
+
+QUICKREF
+        <<cproj>> and <<cprojf>> are ISO C99
+
+*/
+
+/*__RCSID("$NetBSD: cproj.c,v 1.3 2010/09/20 17:51:38 christos Exp $"); */
+
+#include <complex.h>
+#include <math.h>
+
+#include "fdlibm.h"
+
+/*
+ * cproj(double complex z)
+ *
+ * These functions return the value of the projection (not stereographic!)
+ * onto the Riemann sphere.
+ *
+ * z projects to z, except that all complex infinities (even those with one
+ * infinite part and one NaN part) project to positive infinity on the real axis.
+ * If z has an infinite part, then cproj(z) shall be equivalent to:
+ *
+ * INFINITY + I * copysign(0.0, cimag(z))
+ */
+double complex
+cproj(double complex z)
+{
+	double_complex w = { .z = z };
+
+	if (isinf(creal(z)) || isinf(cimag(z))) {
+#ifdef __INFINITY
+		REAL_PART(w) = __INFINITY;
+#else
+		REAL_PART(w) = INFINITY;
+#endif
+		IMAG_PART(w) = copysign(0.0, cimag(z));
+	}
+
+	return (w.z);
+}