56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/* mpq_canonicalize(op) -- Remove common factors of the denominator and
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numerator in OP.
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Copyright 1991, 1994, 1995, 1996, 2000, 2001, 2005 Free Software Foundation,
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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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#include "gmp.h"
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#include "gmp-impl.h"
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void
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mpq_canonicalize (MP_RAT *op)
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{
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mpz_t gcd;
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TMP_DECL;
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if (op->_mp_den._mp_size == 0)
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DIVIDE_BY_ZERO;
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TMP_MARK;
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/* ??? Dunno if the 1+ is needed. */
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MPZ_TMP_INIT (gcd, 1 + MAX (ABS (op->_mp_num._mp_size),
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ABS (op->_mp_den._mp_size)));
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mpz_gcd (gcd, &(op->_mp_num), &(op->_mp_den));
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if (! MPZ_EQUAL_1_P (gcd))
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{
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mpz_divexact_gcd (&(op->_mp_num), &(op->_mp_num), gcd);
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mpz_divexact_gcd (&(op->_mp_den), &(op->_mp_den), gcd);
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}
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if (op->_mp_den._mp_size < 0)
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{
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op->_mp_num._mp_size = -op->_mp_num._mp_size;
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op->_mp_den._mp_size = -op->_mp_den._mp_size;
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}
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TMP_FREE;
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}
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