1 files changed, 70 insertions, 0 deletions
diff --git a/usr/src/lib/libm/common/complex/cacosh.c b/usr/src/lib/libm/common/complex/cacosh.c
new file mode 100644
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+++ b/usr/src/lib/libm/common/complex/cacosh.c
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+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
+ */
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma weak cacosh = __cacosh
+
+/* INDENT OFF */
+/*
+ * dcomplex cacosh(dcomplex z);
+ *	cacosh z = +-i cacos z .
+ * In order to make conj(cacosh(z))=cacosh(conj(z)),
+ * we define
+ *	cacosh z = sign(Im(z))*i cacos z .
+ *
+ */
+/* INDENT ON */
+
+#include "libm.h"	/* fabs/isnan/isinf/signbit */
+#include "complex_wrapper.h"
+
+/* need to work on special cases according to spec */
+
+dcomplex
+cacosh(dcomplex z) {
+	dcomplex w, ans;
+	double x, y;
+
+	w = cacos(z);
+	x = D_RE(z);
+	y = D_IM(z);
+	if (isnan(y)) {
+		D_IM(ans) = y + y;
+		if (isinf(x))
+			D_RE(ans) = fabs(x);
+		else
+			D_RE(ans) = y;
+	} else if (signbit(y) == 0) {
+		D_RE(ans) = -D_IM(w);
+		D_IM(ans) = D_RE(w);
+	} else {
+		D_RE(ans) = D_IM(w);
+		D_IM(ans) = -D_RE(w);
+	}
+	return (ans);
+}