libs/port/isinf.c

   1 /*
   2  * isinf function
   3  *
   4  * Copyright 2008 Petr Sumbera
   5  *
   6  * This 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  * This 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 this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #ifndef HAVE_ISINF
  25
  26 #ifdef HAVE_IEEEFP_H
  27 #include <ieeefp.h>
  28
  29 int isinf(double x)
  30 {
  31   return (!(finite(x) || isnand(x)));
  32 }
  33
  34 #elif defined(HAVE_FLOAT_H) && defined(HAVE__ISNAN) && defined(HAVE__FINITE)
  35 #include <float.h>
  36
  37 int isinf(double x)
  38 {
  39   return (!(_finite(x) || _isnan(x)));
  40 }
  41
  42 #else
  43 #error No isinf() implementation available.
  44 #endif
  45
  46 #endif /* HAVE_ISINF */