1 /* mpq_div -- divide two rational numbers.
3 Copyright (C) 1991, 1994, 1995, 1996 Free Software Foundation, Inc.
5 This file is part of the GNU MP Library.
7 The GNU MP Library is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Library General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or (at your
10 option) any later version.
12 The GNU MP Library is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
15 License for more details.
17 You should have received a copy of the GNU Library General Public License
18 along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20 MA 02111-1307, USA. */
27 mpq_div (mpq_ptr quot, mpq_srcptr op1, mpq_srcptr op2)
29 mpq_div (quot, op1, op2)
45 /* QUOT might be identical to either operand, so don't store the
46 result there until we are finished with the input operands. We
47 dare to overwrite the numerator of QUOT when we are finished
48 with the numerators of OP1 and OP2. */
50 mpz_gcd (gcd1, &(op1->_mp_num), &(op2->_mp_num));
51 mpz_gcd (gcd2, &(op2->_mp_den), &(op1->_mp_den));
53 if (gcd1->_mp_size > 1 || gcd1->_mp_d[0] != 1)
54 mpz_divexact (tmp1, &(op1->_mp_num), gcd1);
56 mpz_set (tmp1, &(op1->_mp_num));
58 if (gcd2->_mp_size > 1 || gcd2->_mp_d[0] != 1)
59 mpz_divexact (tmp2, &(op2->_mp_den), gcd2);
61 mpz_set (tmp2, &(op2->_mp_den));
63 mpz_mul (numtmp, tmp1, tmp2);
65 if (gcd1->_mp_size > 1 || gcd1->_mp_d[0] != 1)
66 mpz_divexact (tmp1, &(op2->_mp_num), gcd1);
68 mpz_set (tmp1, &(op2->_mp_num));
70 if (gcd2->_mp_size > 1 || gcd2->_mp_d[0] != 1)
71 mpz_divexact (tmp2, &(op1->_mp_den), gcd2);
73 mpz_set (tmp2, &(op1->_mp_den));
75 mpz_mul (&(quot->_mp_den), tmp1, tmp2);
77 /* We needed to go via NUMTMP to take care of QUOT being the same
78 as either input operands. Now move NUMTMP to QUOT->_mp_num. */
79 mpz_set (&(quot->_mp_num), numtmp);
81 /* Keep the denominator positive. */
82 if (quot->_mp_den._mp_size < 0)
84 quot->_mp_den._mp_size = -quot->_mp_den._mp_size;
85 quot->_mp_num._mp_size = -quot->_mp_num._mp_size;