82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
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/* mpz_divmod_ui(quot,rem,dividend,short_divisor) --
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Set QUOT to DIVIDEND / SHORT_DIVISOR
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and REM to DIVIDEND mod SHORT_DIVISOR.
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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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#include "longlong.h"
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void
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#ifdef __STDC__
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mpz_divmod_ui (MP_INT *quot, MP_INT *rem,
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const MP_INT *dividend, unsigned long int divisor_limb)
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#else
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mpz_divmod_ui (quot, rem, dividend, divisor_limb)
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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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unsigned long int divisor_limb;
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#endif
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{
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mp_size sign_dividend;
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mp_size dividend_size, quot_size;
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mp_ptr dividend_ptr, quot_ptr;
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mp_limb remainder_limb;
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sign_dividend = dividend->size;
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dividend_size = ABS (dividend->size);
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if (dividend_size == 0)
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{
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quot->size = 0;
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rem->size = 0;
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return;
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}
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/* No need for temporary allocation and copying if QUOT == DIVIDEND as
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the divisor is just one limb, and thus no intermediate remainders
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need to be stored. */
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if (quot->alloc < dividend_size)
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_mpz_realloc (quot, dividend_size);
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quot_ptr = quot->d;
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dividend_ptr = dividend->d;
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remainder_limb = mpn_divmod_1 (quot_ptr,
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dividend_ptr, dividend_size, divisor_limb);
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if (remainder_limb == 0)
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rem->size = 0;
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else
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{
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/* Store the single-limb remainder. We don't check if there's space
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for just one limb, since no function ever makes zero space. */
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rem->size = sign_dividend >= 0 ? 1 : -1;
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rem->d[0] = remainder_limb;
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}
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/* The quotient is DIVIDEND_SIZE limbs, but the most significant
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might be zero. Set QUOT_SIZE properly. */
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quot_size = dividend_size - (quot_ptr[dividend_size - 1] == 0);
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quot->size = sign_dividend >= 0 ? quot_size : -quot_size;
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}
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