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44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/* Emulation for ceill.
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Contributed by Paolo Bonzini
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Copyright 2002, 2003 Free Software Foundation, Inc.
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This file is part of gnulib.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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#include <float.h>
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#include "mathl.h"
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/* To compute the integer part of X, sum a big enough
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integer so that the precision of the floating point
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number is exactly 1. */
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long double
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ceill(long double x)
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{
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long double y;
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if (x < 0.0L)
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y = -(1.0L / LDBL_EPSILON - x - 1.0 / LDBL_EPSILON);
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else
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y = 1.0L / LDBL_EPSILON + x - 1.0 / LDBL_EPSILON;
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if (y < x)
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return y + 1.0L;
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else
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return y;
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}
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