63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/* mpz_divexact_ui -- exact division mpz by ulong.
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Copyright 2001, 2002 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., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA.
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*/
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#include "gmp.h"
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#include "gmp-impl.h"
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void
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mpz_divexact_ui (mpz_ptr dst, mpz_srcptr src, unsigned long divisor)
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{
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mp_size_t size, abs_size;
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mp_ptr dst_ptr;
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if (divisor == 0)
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DIVIDE_BY_ZERO;
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/* For nails don't try to be clever if d is bigger than a limb, just fake
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up an mpz_t and go to the main mpz_divexact. */
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if (divisor > GMP_NUMB_MAX)
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{
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mp_limb_t dlimbs[2];
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mpz_t dz;
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ALLOC(dz) = 2;
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PTR(dz) = dlimbs;
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mpz_set_ui (dz, divisor);
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mpz_divexact (dst, src, dz);
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return;
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}
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size = SIZ(src);
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if (size == 0)
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{
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SIZ(dst) = 0;
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return;
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}
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abs_size = ABS (size);
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MPZ_REALLOC (dst, abs_size);
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dst_ptr = PTR(dst);
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MPN_DIVREM_OR_DIVEXACT_1 (dst_ptr, PTR(src), abs_size, (mp_limb_t) divisor);
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abs_size -= (dst_ptr[abs_size-1] == 0);
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SIZ(dst) = (size >= 0 ? abs_size : -abs_size);
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}
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