1/* mpq_canonicalize(op) -- Remove common factors of the denominator and 2 numerator in OP. 3 4Copyright 1991, 1994, 1995, 1996, 2000, 2001, 2005 Free Software Foundation, 5Inc. 6 7This file is part of the GNU MP Library. 8 9The GNU MP Library is free software; you can redistribute it and/or modify 10it under the terms of the GNU Lesser General Public License as published by 11the Free Software Foundation; either version 3 of the License, or (at your 12option) any later version. 13 14The GNU MP Library is distributed in the hope that it will be useful, but 15WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17License for more details. 18 19You should have received a copy of the GNU Lesser General Public License 20along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ 21 22#include "gmp.h" 23#include "gmp-impl.h" 24 25void 26mpq_canonicalize (MP_RAT *op) 27{ 28 mpz_t gcd; 29 TMP_DECL; 30 31 if (op->_mp_den._mp_size == 0) 32 DIVIDE_BY_ZERO; 33 34 TMP_MARK; 35 36 /* ??? Dunno if the 1+ is needed. */ 37 MPZ_TMP_INIT (gcd, 1 + MAX (ABS (op->_mp_num._mp_size), 38 ABS (op->_mp_den._mp_size))); 39 40 mpz_gcd (gcd, &(op->_mp_num), &(op->_mp_den)); 41 if (! MPZ_EQUAL_1_P (gcd)) 42 { 43 mpz_divexact_gcd (&(op->_mp_num), &(op->_mp_num), gcd); 44 mpz_divexact_gcd (&(op->_mp_den), &(op->_mp_den), gcd); 45 } 46 47 if (op->_mp_den._mp_size < 0) 48 { 49 op->_mp_num._mp_size = -op->_mp_num._mp_size; 50 op->_mp_den._mp_size = -op->_mp_den._mp_size; 51 } 52 TMP_FREE; 53} 54