1
2/*
3 * Copyright (c) 1998, 2001, Oracle and/or its affiliates. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.  Oracle designates this
9 * particular file as subject to the "Classpath" exception as provided
10 * by Oracle in the LICENSE file that accompanied this code.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
23 * or visit www.oracle.com if you need additional information or have any
24 * questions.
25 */
26/*
27 * wrapper atanh(x)
28 */
29
30#include "fdlibm.h"
31
32
33#ifdef __STDC__
34        double atanh(double x)          /* wrapper atanh */
35#else
36        double atanh(x)                 /* wrapper atanh */
37        double x;
38#endif
39{
40#ifdef _IEEE_LIBM
41        return __ieee754_atanh(x);
42#else
43        double z,y;
44        z = __ieee754_atanh(x);
45        if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
46        y = fabs(x);
47        if(y>=1.0) {
48            if(y>1.0)
49                return __kernel_standard(x,x,30); /* atanh(|x|>1) */
50            else
51                return __kernel_standard(x,x,31); /* atanh(|x|==1) */
52        } else
53            return z;
54#endif
55}
56