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Annotation of OpenXM_contrib/gmp/mpq/canonicalize.c, Revision 1.1.1.3

1.1       maekawa     1: /* mpq_canonicalize(op) -- Remove common factors of the denominator and
                      2:    numerator in OP.
                      3:
1.1.1.3 ! ohara       4: Copyright 1991, 1994, 1995, 1996, 2000, 2001 Free Software Foundation, Inc.
1.1       maekawa     5:
                      6: This file is part of the GNU MP Library.
                      7:
                      8: The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2   maekawa     9: it under the terms of the GNU Lesser General Public License as published by
                     10: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    11: option) any later version.
                     12:
                     13: The GNU MP Library is distributed in the hope that it will be useful, but
                     14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.1.1.2   maekawa    15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    16: License for more details.
                     17:
1.1.1.2   maekawa    18: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     21: MA 02111-1307, USA. */
                     22:
                     23: #include "gmp.h"
                     24: #include "gmp-impl.h"
                     25:
                     26: void
                     27: mpq_canonicalize (MP_RAT *op)
                     28: {
                     29:   mpz_t gcd;
                     30:   TMP_DECL (marker);
                     31:
1.1.1.3 ! ohara      32:   if (op->_mp_den._mp_size == 0)
        !            33:     DIVIDE_BY_ZERO;
        !            34:
1.1       maekawa    35:   TMP_MARK (marker);
                     36:
                     37:   /* ??? Dunno if the 1+ is needed.  */
                     38:   MPZ_TMP_INIT (gcd, 1 + MAX (ABS (op->_mp_num._mp_size),
                     39:                              ABS (op->_mp_den._mp_size)));
                     40:
                     41:   mpz_gcd (gcd, &(op->_mp_num), &(op->_mp_den));
1.1.1.3 ! ohara      42:   if (! MPZ_EQUAL_1_P (gcd))
        !            43:     {
        !            44:       mpz_divexact_gcd (&(op->_mp_num), &(op->_mp_num), gcd);
        !            45:       mpz_divexact_gcd (&(op->_mp_den), &(op->_mp_den), gcd);
        !            46:     }
1.1       maekawa    47:
                     48:   if (op->_mp_den._mp_size < 0)
                     49:     {
                     50:       op->_mp_num._mp_size = -op->_mp_num._mp_size;
                     51:       op->_mp_den._mp_size = -op->_mp_den._mp_size;
                     52:     }
                     53:   TMP_FREE (marker);
                     54: }