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Annotation of OpenXM_contrib/gmp/mpq/canonicalize.c, Revision 1.1.1.1

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: }