63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
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/* mpz_fdiv_qr -- Division rounding the quotient towards -infinity.
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The remainder gets the same sign as the denominator.
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Copyright (C) 1994, 1995, 1996 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 Library General Public License as published by
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the Free Software Foundation; either version 2 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 Library General Public
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License for more details.
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You should have received a copy of the GNU Library 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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void
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#if __STDC__
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mpz_fdiv_qr (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, mpz_srcptr divisor)
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#else
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mpz_fdiv_qr (quot, rem, dividend, divisor)
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mpz_ptr quot;
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mpz_ptr rem;
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mpz_srcptr dividend;
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mpz_srcptr divisor;
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#endif
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{
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mp_size_t divisor_size = divisor->_mp_size;
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mpz_t temp_divisor; /* N.B.: lives until function returns! */
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TMP_DECL (marker);
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TMP_MARK (marker);
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/* We need the original value of the divisor after the quotient and
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remainder have been preliminary calculated. We have to copy it to
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temporary space if it's the same variable as either QUOT or REM. */
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if (quot == divisor || rem == divisor)
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{
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MPZ_TMP_INIT (temp_divisor, ABS (divisor_size));
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mpz_set (temp_divisor, divisor);
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divisor = temp_divisor;
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}
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mpz_tdiv_qr (quot, rem, dividend, divisor);
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if ((divisor_size ^ dividend->_mp_size) < 0 && rem->_mp_size != 0)
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{
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mpz_sub_ui (quot, quot, 1L);
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mpz_add (rem, rem, divisor);
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}
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TMP_FREE (marker);
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}
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