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glibc  2.9
s_fdimf.c
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00001 /* Return positive difference between arguments.
00002    Copyright (C) 1997, 2004 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <math.h>
00022 
00023 float
00024 __fdimf (float x, float y)
00025 {
00026   int clsx = fpclassify (x);
00027   int clsy = fpclassify (y);
00028 
00029   if (clsx == FP_NAN || clsy == FP_NAN
00030       || (y < 0 && clsx == FP_INFINITE && clsy == FP_INFINITE))
00031     /* Raise invalid flag.  */
00032     return x - y;
00033 
00034   return x <= y ? 0 : x - y;
00035 }
00036 weak_alias (__fdimf, fdimf)