mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-21 02:10:05 +00:00
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
|
/* Round float value to long int.
|
||
|
|
Copyright (C) 1997 Free Software Foundation, Inc.
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
|
||
|
|
The GNU C Library is free software; you can redistribute it and/or
|
||
|
|
modify it under the terms of the GNU Library General Public License as
|
||
|
|
published by the Free Software Foundation; either version 2 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
|
||
|
|
Library General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Library General Public
|
||
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
||
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||
|
|
Boston, MA 02111-1307, USA. */
|
||
|
|
|
||
|
|
#include <math.h>
|
||
|
|
|
||
|
|
/* I think that what this routine is supposed to do is round a value
|
||
|
|
to the nearest integer, with values exactly on the boundary rounded
|
||
|
|
away from zero. */
|
||
|
|
/* This routine relies on (long int)x, when x is out of range of a long int,
|
||
|
|
clipping to MAX_LONG or MIN_LONG. */
|
||
|
|
|
||
|
|
long int
|
||
|
|
__lroundf (float x)
|
||
|
|
{
|
||
|
|
float xrf;
|
||
|
|
long int xr;
|
||
|
|
xr = (long int) x;
|
||
|
|
xrf = (float) xr;
|
||
|
|
if (x >= 0.0)
|
||
|
|
if (x - xrf >= 0.5 && x - xrf < 1.0 && x+1 > 0)
|
||
|
|
return x+1;
|
||
|
|
else
|
||
|
|
return x;
|
||
|
|
else
|
||
|
|
if (xrf - x >= 0.5 && xrf - x < 1.0 && x-1 < 0)
|
||
|
|
return x-1;
|
||
|
|
else
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
weak_alias (__lroundf, lroundf)
|