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50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/* Round double value to long long int.
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Copyright (C) 1997-2013 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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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 long)x, when x is out of range of a long long,
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clipping to MAX_LLONG or MIN_LLONG. */
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long long int
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__llround (double x)
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{
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double xrf;
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long long int xr;
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xr = (long 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 (__llround, llround)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__llround, __llroundl)
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weak_alias (__llround, llroundl)
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#endif
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