canonicalize.c
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上传日期:2022-08-06
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- /* mpq_canonicalize(op) -- Remove common factors of the denominator and
- numerator in OP.
- Copyright 1991, 1994, 1995, 1996, 2000, 2001, 2005 Free Software Foundation,
- Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include "gmp.h"
- #include "gmp-impl.h"
- void
- mpq_canonicalize (MP_RAT *op)
- {
- mpz_t gcd;
- TMP_DECL;
- if (op->_mp_den._mp_size == 0)
- DIVIDE_BY_ZERO;
- TMP_MARK;
- /* ??? Dunno if the 1+ is needed. */
- MPZ_TMP_INIT (gcd, 1 + MAX (ABS (op->_mp_num._mp_size),
- ABS (op->_mp_den._mp_size)));
- mpz_gcd (gcd, &(op->_mp_num), &(op->_mp_den));
- if (! MPZ_EQUAL_1_P (gcd))
- {
- mpz_divexact_gcd (&(op->_mp_num), &(op->_mp_num), gcd);
- mpz_divexact_gcd (&(op->_mp_den), &(op->_mp_den), gcd);
- }
- if (op->_mp_den._mp_size < 0)
- {
- op->_mp_num._mp_size = -op->_mp_num._mp_size;
- op->_mp_den._mp_size = -op->_mp_den._mp_size;
- }
- TMP_FREE;
- }