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Annotation of OpenXM_contrib/gmp/mpq/canonicalize.c, Revision 1.1

1.1     ! maekawa     1: /* mpq_canonicalize(op) -- Remove common factors of the denominator and
        !             2:    numerator in OP.
        !             3:
        !             4: Copyright (C) 1991, 1994, 1995, 1996 Free Software Foundation, Inc.
        !             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
        !             9: it under the terms of the GNU Library General Public License as published by
        !            10: the Free Software Foundation; either version 2 of the License, or (at your
        !            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
        !            15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            16: License for more details.
        !            17:
        !            18: You should have received a copy of the GNU Library General Public License
        !            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: #if __STDC__
        !            28: mpq_canonicalize (MP_RAT *op)
        !            29: #else
        !            30: mpq_canonicalize (op)
        !            31:      MP_RAT *op;
        !            32: #endif
        !            33: {
        !            34:   mpz_t gcd;
        !            35:   TMP_DECL (marker);
        !            36:
        !            37:   TMP_MARK (marker);
        !            38:
        !            39:   /* ??? Dunno if the 1+ is needed.  */
        !            40:   MPZ_TMP_INIT (gcd, 1 + MAX (ABS (op->_mp_num._mp_size),
        !            41:                              ABS (op->_mp_den._mp_size)));
        !            42:
        !            43:   mpz_gcd (gcd, &(op->_mp_num), &(op->_mp_den));
        !            44:   mpz_divexact (&(op->_mp_num), &(op->_mp_num), gcd);
        !            45:   mpz_divexact (&(op->_mp_den), &(op->_mp_den), gcd);
        !            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 (marker);
        !            53: }