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Diffstat (limited to 'contrib/libgmp/mpq/canonicalize.c')
-rw-r--r-- | contrib/libgmp/mpq/canonicalize.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/contrib/libgmp/mpq/canonicalize.c b/contrib/libgmp/mpq/canonicalize.c new file mode 100644 index 0000000..901e6eb --- /dev/null +++ b/contrib/libgmp/mpq/canonicalize.c @@ -0,0 +1,53 @@ +/* mpq_canonicalize(op) -- Remove common factors of the denominator and + numerator in OP. + +Copyright (C) 1991, 1994, 1995, 1996 Free Software Foundation, Inc. + +This file is part of the GNU MP Library. + +The GNU MP Library is free software; you can redistribute it and/or modify +it under the terms of the GNU Library General Public License as published by +the Free Software Foundation; either version 2 of the License, or (at your +option) any later version. + +The GNU MP Library is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public +License for more details. + +You should have received a copy of the GNU Library General Public License +along with the GNU MP Library; see the file COPYING.LIB. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, +MA 02111-1307, USA. */ + +#include "gmp.h" +#include "gmp-impl.h" + +void +#if __STDC__ +mpq_canonicalize (MP_RAT *op) +#else +mpq_canonicalize (op) + MP_RAT *op; +#endif +{ + mpz_t gcd; + TMP_DECL (marker); + + TMP_MARK (marker); + + /* ??? Dunno if the 1+ is needed. */ + MPZ_TMP_INIT (gcd, 1 + MAX (ABS (op->_mp_num._mp_size), + ABS (op->_mp_den._mp_size))); + + mpz_gcd (gcd, &(op->_mp_num), &(op->_mp_den)); + mpz_divexact (&(op->_mp_num), &(op->_mp_num), gcd); + mpz_divexact (&(op->_mp_den), &(op->_mp_den), gcd); + + if (op->_mp_den._mp_size < 0) + { + op->_mp_num._mp_size = -op->_mp_num._mp_size; + op->_mp_den._mp_size = -op->_mp_den._mp_size; + } + TMP_FREE (marker); +} |