1 /* mpq_canonicalize(op) -- Remove common factors of the denominator and 2 numerator in OP. 3 4 Copyright 1991, 1994, 1995, 1996, 2000, 2001, 2005 Free Software Foundation, 5 Inc. 6 7 This file is part of the GNU MP Library. 8 9 The GNU MP Library is free software; you can redistribute it and/or modify 10 it under the terms of the GNU Lesser General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or (at your 12 option) any later version. 13 14 The GNU MP Library is distributed in the hope that it will be useful, but 15 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17 License for more details. 18 19 You should have received a copy of the GNU Lesser General Public License 20 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ 21 22 #include "gmp.h" 23 #include "gmp-impl.h" 24 25 void 26 mpq_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