86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/* mpz_tdiv_q -- divide two integers and produce a quotient.
|
|
|
|
Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2005 Free Software Foundation,
|
|
Inc.
|
|
|
|
This file is part of the GNU MP Library.
|
|
|
|
The GNU MP Library is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The GNU MP 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 Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the GNU MP Library; see the file COPYING.LIB. If not, write to
|
|
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
|
MA 02110-1301, USA. */
|
|
|
|
#include "gmp.h"
|
|
#include "gmp-impl.h"
|
|
#include "longlong.h"
|
|
|
|
void
|
|
mpz_tdiv_q (mpz_ptr quot, mpz_srcptr num, mpz_srcptr den)
|
|
{
|
|
mp_size_t ql;
|
|
mp_size_t ns, ds, nl, dl;
|
|
mp_ptr np, dp, qp, rp;
|
|
TMP_DECL;
|
|
|
|
ns = SIZ (num);
|
|
ds = SIZ (den);
|
|
nl = ABS (ns);
|
|
dl = ABS (ds);
|
|
ql = nl - dl + 1;
|
|
|
|
if (dl == 0)
|
|
DIVIDE_BY_ZERO;
|
|
|
|
if (ql <= 0)
|
|
{
|
|
SIZ (quot) = 0;
|
|
return;
|
|
}
|
|
|
|
MPZ_REALLOC (quot, ql);
|
|
|
|
TMP_MARK;
|
|
qp = PTR (quot);
|
|
rp = (mp_ptr) TMP_ALLOC (dl * BYTES_PER_MP_LIMB);
|
|
np = PTR (num);
|
|
dp = PTR (den);
|
|
|
|
/* FIXME: We should think about how to handle the temporary allocation.
|
|
Perhaps mpn_tdiv_qr should handle it, since it anyway often needs to
|
|
allocate temp space. */
|
|
|
|
/* Copy denominator to temporary space if it overlaps with the quotient. */
|
|
if (dp == qp)
|
|
{
|
|
mp_ptr tp;
|
|
tp = (mp_ptr) TMP_ALLOC (dl * BYTES_PER_MP_LIMB);
|
|
MPN_COPY (tp, dp, dl);
|
|
dp = tp;
|
|
}
|
|
/* Copy numerator to temporary space if it overlaps with the quotient. */
|
|
if (np == qp)
|
|
{
|
|
mp_ptr tp;
|
|
tp = (mp_ptr) TMP_ALLOC (nl * BYTES_PER_MP_LIMB);
|
|
MPN_COPY (tp, np, nl);
|
|
np = tp;
|
|
}
|
|
|
|
mpn_tdiv_qr (qp, rp, 0L, np, nl, dp, dl);
|
|
|
|
ql -= qp[ql - 1] == 0;
|
|
|
|
SIZ (quot) = (ns ^ ds) >= 0 ? ql : -ql;
|
|
TMP_FREE;
|
|
}
|