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annotate packages/language/c/libm/current/src/complex/cprojf.c @ 3260:77f9d3253c3e

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Add: Complex number header and library (single and double precision floating point), port from Newlib. Add: Single precision floating point library, port from Newlib. [ Bugzilla 1001539 ]
author vae
date Sun, 25 Aug 2013 14:38:57 +0000
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3260
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1 /* $NetBSD: cprojf.c,v 1.3 2010/09/20 17:51:38 christos Exp $ */
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2
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3 /*-
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4 * Copyright (c) 2010 The NetBSD Foundation, Inc.
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5 * All rights reserved.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 *
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28 * imported and modified include for newlib 2010/10/03
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29 * Marco Atzeri <marco_atzeri@yahoo.it>
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30 */
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31
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32 /*__RCSID("$NetBSD: cprojf.c,v 1.3 2010/09/20 17:51:38 christos Exp $"); */
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33
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34 #include <complex.h>
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35 #include <math.h>
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36
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37 #include "../mathincl/fdlibm.h"
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38
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39 /*
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40 * cprojf(float complex z)
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41 *
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42 * These functions return the value of the projection (not stereographic!)
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43 * onto the Riemann sphere.
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44 *
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45 * z projects to z, except that all complex infinities (even those with one
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46 * infinite part and one NaN part) project to positive infinity on the real axis.
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47 * If z has an infinite part, then cproj(z) shall be equivalent to:
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48 *
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49 * INFINITY + I * copysign(0.0, cimag(z))
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50 */
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51
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52 float complex
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53 cprojf(float complex z)
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54 {
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55 float_complex w = { .z = z };
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56
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57 if (isinff(crealf(z)) || isinff(cimagf(z))) {
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58 #ifdef __INFINITY
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59 REAL_PART(w) = __INFINITY;
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60 #else
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61 REAL_PART(w) = HUGE_VALF;
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62 #endif
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63 IMAG_PART(w) = copysignf(0.0, cimagf(z));
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64 }
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65
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66 return (w.z);
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67 }