math/s_cprojf.c

   1 /* Compute projection of complex float value to Riemann sphere.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <complex.h>
  21 #include <math.h>
  22
  23
  24 __complex__ float
  25 __cprojf (__complex__ float x)
  26 {
  27   if (__isinf_nsf (__real__ x) || __isinf_nsf (__imag__ x))
  28     {
  29       __complex__ float res;
  30
  31       __real__ res = INFINITY;
  32       __imag__ res = __copysignf (0.0, __imag__ x);
  33
  34       return res;
  35     }
  36
  37   return x;
  38 }
  39 #ifndef __cprojf
  40 weak_alias (__cprojf, cprojf)
  41 #endif