1 /*
2 Copyright (c) 2007 The NetBSD Foundation, Inc.
3 All rights reserved.
4
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
7 are met:
8 1. Redistributions of source code must retain the above copyright
9 notice, this list of conditions and the following disclaimer.
10 2. Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
13
14 THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
15 AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
16 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
18 BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 POSSIBILITY OF SUCH DAMAGE.
25 */
26 /* $NetBSD: creal.c,v 1.2 2010/09/15 16:11:29 christos Exp $ */
27
28 /*
29 * Written by Matthias Drochner <drochner@NetBSD.org>.
30 * Public domain.
31 *
32 * imported and modified include for newlib 2010/10/03
33 * Marco Atzeri <marco_atzeri@yahoo.it>
34 */
35
36 /*
37 FUNCTION
38 <<creal>>, <<crealf>>, <<creall>>---real part
39
40 INDEX
41 creal
42 INDEX
43 crealf
44 INDEX
45 creall
46
47 SYNOPSIS
48 #include <complex.h>
49 double creal(double complex <[z]>);
50 float crealf(float complex <[z]>);
51 double long creall(long double complex <[z]>);
52
53
54 DESCRIPTION
55 These functions compute the real part of <[z]>.
56
57 <<crealf>> is identical to <<creal>>, except that it performs
58 its calculations on <<float complex>>.
59
60 <<creall>> is identical to <<creal>>, except that it performs
61 its calculations on <<long double complex>>.
62
63 RETURNS
64 The creal* functions return the real part value.
65
66 PORTABILITY
67 <<creal>>, <<crealf>> and <<creall>> are ISO C99
68
69 QUICKREF
70 <<creal>>, <<crealf>> and <<creall>> are ISO C99
71
72 */
73
74
75 #include <complex.h>
76 #include "../common/fdlibm.h"
77
78 double
creal(double complex z)79 creal(double complex z)
80 {
81 double_complex w = { .z = z };
82
83 return (REAL_PART(w));
84 }
85
