63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/*=============================================================================
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This file is part of FLINT.
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FLINT 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 of the License, or
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(at your option) any later version.
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FLINT 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 FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2009 William Hart
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******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <gmp.h>
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#include "flint.h"
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#include "ulong_extras.h"
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#include "fmpz.h"
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ulong
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fmpz_fdiv_ui(const fmpz_t g, ulong h)
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{
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fmpz c1 = *g;
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ulong r;
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if (h == UWORD(0))
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{
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flint_printf("Exception (fmpz_fdiv_ui). Division by 0.\n");
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abort();
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}
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if (!COEFF_IS_MPZ(c1)) /* g is small */
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{
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if (c1 < WORD(0))
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{
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r = h - (-c1 % h); /* C doesn't correctly handle negative mods */
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if (r == h)
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r = 0;
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}
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else
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r = c1 % h;
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return r;
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}
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else /* g is large */
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{
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return flint_mpz_fdiv_ui(COEFF_TO_PTR(c1), h);
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}
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}
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