src/libs/libgroff/hypot.c

   1 /* Copyright (C) 2005 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library 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 GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include <config.h>
  21 #endif
  22
  23 #include <math.h>
  24
  25 #ifdef __cplusplus
  26 extern "C" {
  27 #endif
  28
  29 #ifdef NEED_DECLARATION_HYPOT
  30   double hypot(double, double);
  31 #endif /* NEED_DECLARATION_HYPOT */
  32
  33 double groff_hypot(double x, double y)
  34 {
  35   double result = hypot(x, y);
  36
  37 #ifdef __INTERIX
  38   /* hypot() on Interix is broken */
  39   if (isnan(result) && !isnan(x) && !isnan(y))
  40     return 0.0;
  41 #endif
  42
  43   return result;
  44 }
  45
  46 #ifdef __cplusplus
  47 }
  48 #endif