math/w_scalbln.c

   1 /* Wrapper for __scalbln handles setting errno.
   2    Copyright (C) 2014-2016 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 <errno.h>
  20 #include <math.h>
  21 #include <math_private.h>
  22
  23 double
  24 __w_scalbln (double x, long int n)
  25 {
  26   if (!isfinite (x) || x == 0.0)
  27     return x + x;
  28
  29   x = __scalbln (x, n);
  30
  31   if (!isfinite (x) || x == 0.0)
  32     __set_errno (ERANGE);
  33
  34   return x;
  35 }
  36 weak_alias (__w_scalbln, scalbln)
  37
  38 #ifdef NO_LONG_DOUBLE
  39 weak_alias (__w_scalbln, scalblnl)
  40 #endif