51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/* Round double value to long int.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <math.h>
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/* I think that what this routine is supposed to do is round a value
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to the nearest integer, with values exactly on the boundary rounded
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away from zero. */
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/* This routine relies on (long int)x, when x is out of range of a long int,
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clipping to MAX_LONG or MIN_LONG. */
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long int
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__lround (double x)
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{
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double xrf;
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long int xr;
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xr = (long int) x;
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xrf = (double) xr;
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if (x >= 0.0)
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if (x - xrf >= 0.5 && x - xrf < 1.0 && x+1 > 0)
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return x+1;
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else
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return x;
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else
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if (xrf - x >= 0.5 && xrf - x < 1.0 && x-1 < 0)
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return x-1;
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else
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return x;
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}
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weak_alias (__lround, lround)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__lround, __lroundl)
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weak_alias (__lround, lroundl)
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#endif
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