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: cabs.c,v 1.1 2007/08/20 16:01:30 drochner 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         <<cabs>>, <<cabsf>>, <<cabsl>>---complex absolute-value
39 
40 INDEX
41         cabs
42 INDEX
43         cabsf
44 INDEX
45         cabsl
46 
47 SYNOPSIS
48        #include <complex.h>
49        double cabs(double complex <[z]>);
50        float cabsf(float complex <[z]>);
51        long double cabsl(long double complex <[z]>);
52 
53 
54 DESCRIPTION
55         These functions compute compute the complex absolute value
56         (also called norm, modulus, or magnitude) of <[z]>.
57 
58         <<cabsf>> is identical to <<cabs>>, except that it performs
59         its calculations on <<float complex>>.
60 
61         <<cabsl>> is identical to <<cabs>>, except that it performs
62         its calculations on <<long double complex>>.
63 
64 RETURNS
65         The cabs* functions return the complex absolute value.
66 
67 PORTABILITY
68         <<cabs>>, <<cabsf>> and <<cabsl>> are ISO C99
69 
70 QUICKREF
71         <<cabs>>, <<cabsf>> and <<cabsl>> are ISO C99
72 
73 */
74 
75 
76 #include <complex.h>
77 #include <math.h>
78 
79 double
cabs(double complex z)80 cabs(double complex z)
81 {
82 
83 	return hypot( creal(z), cimag(z) );
84 }
85