From f834c77e7d1dce645220bce307ad7ca19ac5cf69 Mon Sep 17 00:00:00 2001
From: Aditya Upadhyay <aadit0402@gmail.com>
Date: Thu, 29 Jun 2017 01:42:07 +0530
Subject: [PATCH] Importing ctanl.c from NetBSD.

---
 newlib/libm/complex/Makefile.am |  2 +-
 newlib/libm/complex/ctanl.c     | 56 +++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100755 newlib/libm/complex/ctanl.c

diff --git a/newlib/libm/complex/Makefile.am b/newlib/libm/complex/Makefile.am
index 95066dba9..f8e493b41 100644
--- a/newlib/libm/complex/Makefile.am
+++ b/newlib/libm/complex/Makefile.am
@@ -13,7 +13,7 @@ src = cabs.c cacos.c cacosh.c carg.c casin.c casinh.c \
 lsrc = cabsl.c creall.c cimagl.c ccoshl.c cacoshl.c \
        clogl.c csqrtl.c cargl.c cprojl.c cexpl.c \
        cephes_subrl.c cacosl.c ccosl.c casinl.c \
-       catanhl.c conjl.c cpowl.c ctanhl.c
+       catanhl.c conjl.c cpowl.c ctanhl.c ctanl.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/ctanl.c b/newlib/libm/complex/ctanl.c
new file mode 100755
index 000000000..9255bdb07
--- /dev/null
+++ b/newlib/libm/complex/ctanl.c
@@ -0,0 +1,56 @@
+/* $NetBSD: ctanl.c,v 1.1 2014/10/10 00:48:18 christos 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.
+ */
+
+
+#include <complex.h>
+#include <math.h>
+#include "cephes_subrl.h"
+
+long double complex
+ctanl(long double complex z)
+{
+	long double complex w;
+	long double d;
+
+	d = cosl(2.0L * creall(z)) + coshl(2.0L * cimagl(z));
+
+	if (fabsl(d) < 0.25L)
+		d = _ctansl(z);
+
+	if (d == 0.0L) {
+		/* mtherr ("ctan", OVERFLOW); */
+		w = HUGE_VALF + HUGE_VALF * I;
+		return w;
+	}
+
+	w = sinl(2.0L * creall(z)) / d + (sinhl(2.0L * cimagl(z)) / d) * I;
+	return w;
+}