mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 11:20:07 +00:00
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* Return positive difference between arguments.
|
|
Copyright (C) 1997, 2004, 2009 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <math.h>
|
|
|
|
double
|
|
__fdim (double x, double y)
|
|
{
|
|
int clsx = fpclassify (x);
|
|
int clsy = fpclassify (y);
|
|
|
|
if (clsx == FP_NAN || clsy == FP_NAN
|
|
|| (y < 0 && clsx == FP_INFINITE && clsy == FP_INFINITE))
|
|
/* Raise invalid flag. */
|
|
return x - y;
|
|
|
|
if (x <= y)
|
|
return 0.0;
|
|
|
|
double r = x - y;
|
|
if (fpclassify (r) == FP_INFINITE)
|
|
__set_errno (ERANGE);
|
|
|
|
return r;
|
|
}
|
|
weak_alias (__fdim, fdim)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__fdim, __fdiml)
|
|
weak_alias (__fdim, fdiml)
|
|
#endif
|