65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/* mpz_mdivmod -- Mathematical DIVision and MODulo, i.e. division that rounds
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the quotient towards -infinity, and with the remainder non-negative.
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Copyright (C) 1991, 1992 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 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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The GNU MP 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
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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
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along with the GNU MP Library; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, 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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#ifdef __STDC__
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mpz_mdivmod (MP_INT *quot, MP_INT *rem,
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const MP_INT *dividend, const MP_INT *divisor)
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#else
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mpz_mdivmod (quot, rem, dividend, divisor)
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MP_INT *quot;
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MP_INT *rem;
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const MP_INT *dividend;
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const MP_INT *divisor;
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#endif
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{
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if ((dividend->size ^ divisor->size) >= 0)
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{
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/* When the dividend and the divisor has same sign, this function
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gives same result as mpz_divmod. */
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mpz_divmod (quot, rem, dividend, divisor);
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}
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else
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{
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MP_INT temp_divisor; /* N.B.: lives until function returns! */
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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_divmod (quot, rem, dividend, divisor);
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if (rem->size != 0)
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{
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mpz_sub_ui (quot, quot, 1);
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mpz_add (rem, rem, divisor);
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}
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}
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}
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