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+/* $NetBSD: clog.c,v 1.1 2007/08/20 16:01:35 drochner Exp $ */
+
+/*-
+ * Copyright (c) 2007 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software written by Stephen L. Moshier.
+ * It is redistributed by the NetBSD Foundation by permission of the author.
+ *
+ * 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
+        <<clog>>, <<clogf>>---complex base-e logarithm
+
+INDEX
+        clog
+INDEX
+        clogf
+
+ANSI_SYNOPSIS
+       #include <complex.h>
+       double complex clog(double complex <[z]>);
+       float complex clogf(float complex <[z]>);
+
+
+DESCRIPTION
+        These functions compute the complex natural (base-<[e]>) logarithm 
+        of <[z]>, with a branch cut along the negative real axis. 
+
+        <<clogf>> is identical to <<clog>>, except that it performs
+        its calculations on <<floats complex>>.
+
+RETURNS
+        @ifnottex
+        The clog functions return the complex natural logarithm value, in 
+        the range of a strip mathematically unbounded along the real axis 
+        and in the interval [-i*pi , +i*pi] along the imaginary axis.
+        @end ifnottex
+        @tex
+        The clog functions return the complex natural logarithm value, in
+        the range of a strip mathematically unbounded along the real axis
+         and in the interval [$-i\pi$, $+i\pi$] along the imaginary axis.
+        @end tex
+
+PORTABILITY
+        <<clog>> and <<clogf>> are ISO C99
+
+QUICKREF
+        <<clog>> and <<clogf>> are ISO C99
+
+*/
+
+#include <complex.h>
+#include <math.h>
+
+double complex
+clog(double complex z)
+{
+	double complex w;
+	double p, rr;
+
+	rr = cabs(z);
+	p = log(rr);
+	rr = atan2(cimag(z), creal(z));
+	w = p + rr * I;
+	return w;
+}