math/s_nextdown.c

   1 /* Return the greatest floating-point number less than X.
   2    Copyright (C) 2016 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <math.h>
  20 #include <math_private.h>
  21
  22 /* Return the greatest floating-point number less than X.  */
  23 double
  24 __nextdown (double x)
  25 {
  26   return -__nextup (-x);
  27 }
  28
  29 weak_alias (__nextdown, nextdown)
  30 #ifdef NO_LONG_DOUBLE
  31 strong_alias (__nextdown, __nextdownl)
  32 weak_alias (__nextdown, nextdownl)
  33 #endif