[newlib-cygwin] Importing cprojl.c from NetBSD.

[Corinna Vinschen <corinna at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=4c2556e9359fd50521cf69414ddfac0103985753

commit 4c2556e9359fd50521cf69414ddfac0103985753
Author: Aditya Upadhyay <aadit0402@gmail.com>
Date:   Thu Jun 29 01:31:22 2017 +0530

    Importing cprojl.c from NetBSD.

Diff:
---
 newlib/libm/complex/Makefile.am |  2 +-
 newlib/libm/complex/cprojl.c    | 64 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/newlib/libm/complex/Makefile.am b/newlib/libm/complex/Makefile.am
index 48b6d92..1f86709 100644
--- a/newlib/libm/complex/Makefile.am
+++ b/newlib/libm/complex/Makefile.am
@@ -11,7 +11,7 @@ src = cabs.c cacos.c cacosh.c carg.c casin.c casinh.c \
       csin.c csinh.c csqrt.c ctan.c ctanh.c
 
 lsrc = cabsl.c creall.c cimagl.c ccoshl.c cacoshl.c \
-       clogl.c csqrtl.c cargl.c
+       clogl.c csqrtl.c cargl.c cprojl.c
 
 fsrc =	cabsf.c casinf.c ccosf.c cimagf.c cprojf.c  \
         csqrtf.c cacosf.c casinhf.c ccoshf.c clogf.c clog10f.c \
diff --git a/newlib/libm/complex/cprojl.c b/newlib/libm/complex/cprojl.c
new file mode 100755
index 0000000..e71c773
--- /dev/null
+++ b/newlib/libm/complex/cprojl.c
@@ -0,0 +1,64 @@
+/*	$NetBSD: cprojl.c,v 1.7 2014/10/10 00:48:18 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.
+ */
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: cprojl.c,v 1.7 2014/10/10 00:48:18 christos Exp $");
+
+#include <complex.h>
+#include <math.h>
+
+#include "../common/fdlibm.h"
+
+/*
+ * cprojl(long 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))
+ */
+long double complex
+cprojl(long double complex z)
+{
+	long_double_complex w = { .z = z };
+
+	/*CONSTCOND*/
+	if (isinf(creall(z)) || isinf(cimagl(z))) {
+#ifdef __INFINITY
+		REAL_PART(w) = HUGE_VAL;
+#else
+		REAL_PART(w) = INFINITY;
+#endif
+		IMAG_PART(w) = copysignl(0.0L, cimagl(z));
+	}
+
+	return (w.z);
+}