0dc9e0996a
As the current libc includes a libm implementation, with the new libc this is needed. Unneeded (for the moment) archs have been removed.
64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
/* $NetBSD: cprojf.c,v 1.3 2010/09/20 17:51:38 christos Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2010 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* 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 <sys/cdefs.h>
|
|
__RCSID("$NetBSD: cprojf.c,v 1.3 2010/09/20 17:51:38 christos Exp $");
|
|
|
|
#include <complex.h>
|
|
#include <math.h>
|
|
|
|
#include "../src/math_private.h"
|
|
|
|
/*
|
|
* cprojf(float complex z)
|
|
*
|
|
* These functions return the value of the projection (not stereographic!)
|
|
* onto the Riemann sphere.
|
|
*
|
|
* z projects to z, except that all complex infinities (even those with one
|
|
* infinite part and one NaN part) project to positive infinity on the real axis.
|
|
* If z has an infinite part, then cproj(z) shall be equivalent to:
|
|
*
|
|
* INFINITY + I * copysign(0.0, cimag(z))
|
|
*/
|
|
|
|
float complex
|
|
cprojf(float complex z)
|
|
{
|
|
float_complex w = { .z = z };
|
|
|
|
if (isinf(crealf(z) || isinf(cimagf(z)))) {
|
|
#ifdef __INFINITY
|
|
REAL_PART(w) = __INFINITY;
|
|
#else
|
|
REAL_PART(w) = INFINITY;
|
|
#endif
|
|
IMAG_PART(w) = copysignf(0.0, cimagf(z));
|
|
}
|
|
|
|
return (w.z);
|
|
}
|