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16f0eced | 1 | /* Compute projection of complex long double value to Riemann sphere. |
88e236a6 | 2 | Copyright (C) 1997,1999,2006,2010 Free Software Foundation, Inc. |
16f0eced RM |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. */ | |
20 | ||
21 | #include <complex.h> | |
22 | #include <math.h> | |
23 | #include <math_ldbl_opt.h> | |
24 | ||
25 | __complex__ long double | |
26 | __cprojl (__complex__ long double x) | |
27 | { | |
16f0eced RM |
28 | if (isnan (__real__ x) && isnan (__imag__ x)) |
29 | return x; | |
30 | else if (!isfinite (__real__ x) || !isfinite (__imag__ x)) | |
31 | { | |
88e236a6 UD |
32 | __complex__ long double res; |
33 | ||
16f0eced RM |
34 | __real__ res = INFINITY; |
35 | __imag__ res = __copysignl (0.0, __imag__ x); | |
16f0eced | 36 | |
88e236a6 | 37 | return res; |
16f0eced RM |
38 | } |
39 | ||
88e236a6 | 40 | return x; |
16f0eced RM |
41 | } |
42 | long_double_symbol (libm, __cprojl, cprojl); |