1  /*
       2   * floatmagic.h -- Definitions of isnan and isinf for gawk.
       3   */
       4  
       5  /*
       6   * Copyright (C) 2009 the Free Software Foundation, Inc.
       7   *
       8   * This file is part of GAWK, the GNU implementation of the
       9   * AWK Programming Language.
      10   *
      11   * GAWK is free software; you can redistribute it and/or modify
      12   * it under the terms of the GNU General Public License as published by
      13   * the Free Software Foundation; either version 3 of the License, or
      14   * (at your option) any later version.
      15   *
      16   * GAWK is distributed in the hope that it will be useful,
      17   * but WITHOUT ANY WARRANTY; without even the implied warranty of
      18   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      19   * GNU General Public License for more details.
      20   *
      21   * You should have received a copy of the GNU General Public License
      22   * along with this program; if not, write to the Free Software
      23   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
      24   */
      25  
      26  /*
      27   * NOTE: <math.h> MUST be included before this file. Also <config.h>.
      28   *
      29   * These definitions are taken from the Autoconf 2.63 manual. Not pretty.
      30   */
      31  
      32  #ifndef HAVE_ISNAN
      33  #ifndef isnan
      34  # define isnan(x) \
      35      (sizeof (x) == sizeof (long double) ? isnan_ld (x) \
      36       : sizeof (x) == sizeof (double) ? isnan_d (x) \
      37       : isnan_f (x))
      38  static inline int isnan_f  (float       x) { return x != x; }
      39  static inline int isnan_d  (double      x) { return x != x; }
      40  static inline int isnan_ld (long double x) { return x != x; }
      41  #endif
      42  #endif
      43  
      44  #ifndef HAVE_ISINF
      45  #ifndef isinf
      46  # define isinf(x) \
      47      (sizeof (x) == sizeof (long double) ? isinf_ld (x) \
      48       : sizeof (x) == sizeof (double) ? isinf_d (x) \
      49       : isinf_f (x))
      50  static inline int isinf_f  (float       x) { return isnan (x - x); }
      51  static inline int isinf_d  (double      x) { return isnan (x - x); }
      52  static inline int isinf_ld (long double x) { return isnan (x - x); }
      53  #endif
      54  #endif