mirror of https://github.com/macssh/macssh.git
152 lines
3.0 KiB
C
Executable File
152 lines
3.0 KiB
C
Executable File
/* mpf_trunc, mpf_floor, mpf_ceil -- Assign a float from another float while
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rounding it to an integer.
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Copyright (C) 1997, 1998, 2000 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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#define OPERATION_trunc
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#if defined (OPERATION_floor)
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#define _MPF_FLOOR_OR_CEIL
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#define FUNC_NAME mpf_floor
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#define MPF_FLOOR 1
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#define MPF_CEIL 0
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#elif defined (OPERATION_ceil)
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#define _MPF_FLOOR_OR_CEIL
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#define FUNC_NAME mpf_ceil
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#define MPF_CEIL 1
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#define MPF_FLOOR 0
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#elif defined (OPERATION_trunc)
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#define FUNC_NAME mpf_trunc
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#else
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Error, error, unrecognised OPERATION
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#endif
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#ifdef _MPF_FLOOR_OR_CEIL
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static int
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#if __STDC__
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mpn_zero_p (mp_ptr p, mp_size_t n)
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#else
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mpn_zero_p (p, n)
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mp_ptr p;
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mp_size_t n;
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#endif
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{
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mp_size_t i;
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for (i = 0; i < n; i++)
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{
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if (p[i] != 0)
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return 0;
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}
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return 1;
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}
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#endif
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void
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#if __STDC__
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FUNC_NAME (mpf_ptr r, mpf_srcptr u)
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#else
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FUNC_NAME (r, u)
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mpf_ptr r;
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mpf_srcptr u;
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#endif
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{
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mp_ptr rp, up;
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mp_size_t size, asize;
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mp_size_t prec;
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mp_size_t ignored_n;
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mp_exp_t exp;
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size = u->_mp_size;
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rp = r->_mp_d;
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exp = u->_mp_exp;
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/* Single out the case where |u| < 1. */
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if (exp <= 0)
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{
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#ifdef _MPF_FLOOR_OR_CEIL
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if ((MPF_FLOOR && size < 0) || (MPF_CEIL && size >= 0))
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{
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rp[0] = 1;
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r->_mp_size = MPF_FLOOR ? -1 : 1;
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r->_mp_exp = 1;
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return;
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}
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#endif
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r->_mp_size = 0;
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return;
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}
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prec = r->_mp_prec /* + 1 */;
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asize = ABS (size);
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#ifdef _MPF_FLOOR_OR_CEIL
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ignored_n = 0;
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#endif
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up = u->_mp_d;
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if (asize > prec)
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{
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#ifdef _MPF_FLOOR_OR_CEIL
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ignored_n = asize - prec;
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#endif
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up += asize - prec;
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asize = prec;
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}
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if (asize > exp)
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{
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long diff = asize - exp;
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#ifdef _MPF_FLOOR_OR_CEIL
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ignored_n += diff;
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#endif
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up += diff;
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asize = exp;
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}
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#ifdef _MPF_FLOOR_OR_CEIL
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if (((MPF_FLOOR && size < 0) || (MPF_CEIL && size >= 0))
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&& ! mpn_zero_p (up - ignored_n, ignored_n))
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{
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mp_limb_t cy;
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cy = mpn_add_1 (rp, up, asize, (mp_limb_t) 1);
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if (cy != 0)
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{
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rp[asize++] = cy;
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exp++;
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}
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}
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else
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#endif
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MPN_COPY_INCR (rp, up, asize);
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r->_mp_exp = exp;
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r->_mp_size = size >= 0 ? asize : -asize;
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}
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