lib/isinf.c

   1 /* Test for positive or negative infinity.
   2    Copyright (C) 2007-2011 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License along
  15    with this program; if not, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 /* Written by Ben Pfaff <blp@gnu.org>, 2008. */
  19
  20 #include <config.h>
  21
  22 #include <float.h>
  23
  24 int gl_isinff (float x)
  25 {
  26   return x < -FLT_MAX || x > FLT_MAX;
  27 }
  28
  29 int gl_isinfd (double x)
  30 {
  31   return x < -DBL_MAX || x > DBL_MAX;
  32 }
  33
  34 int gl_isinfl (long double x)
  35 {
  36   return x < -LDBL_MAX || x > LDBL_MAX;
  37 }