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author | markm <markm@FreeBSD.org> | 1995-11-12 14:40:41 +0000 |
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committer | markm <markm@FreeBSD.org> | 1995-11-12 14:40:41 +0000 |
commit | d938bb78837327b46dc34873a6eb60c002605808 (patch) | |
tree | d720c213b0c2f268c17d14276e809e876bd37dc8 /gnu/lib/libgmp/mpq_add.c | |
parent | 7e662b2efdf7b11bed05bdd944746d7b7d0e56af (diff) | |
download | FreeBSD-src-d938bb78837327b46dc34873a6eb60c002605808.zip FreeBSD-src-d938bb78837327b46dc34873a6eb60c002605808.tar.gz |
GNU MP (Multiprecision) library. This is needed by secure RPC (being
done by Bill Paul) and various other BSD programs.
Obtained from:FSF
Diffstat (limited to 'gnu/lib/libgmp/mpq_add.c')
-rw-r--r-- | gnu/lib/libgmp/mpq_add.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/gnu/lib/libgmp/mpq_add.c b/gnu/lib/libgmp/mpq_add.c new file mode 100644 index 0000000..10cc12e --- /dev/null +++ b/gnu/lib/libgmp/mpq_add.c @@ -0,0 +1,85 @@ +/* mpq_add -- add two rational numbers. + +Copyright (C) 1991 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 General Public License as published by +the Free Software Foundation; either version 2, 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with the GNU MP Library; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include "gmp.h" +#include "gmp-impl.h" + +void +#ifdef __STDC__ +mpq_add (MP_RAT *sum, const MP_RAT *a1, const MP_RAT *a2) +#else +mpq_add (sum, a1, a2) + MP_RAT *sum; + const MP_RAT *a1; + const MP_RAT *a2; +#endif +{ + MP_INT gcd1, gcd2; + MP_INT tmp1, tmp2; + + mpz_init (&gcd1); + mpz_init (&gcd2); + mpz_init (&tmp1); + mpz_init (&tmp2); + + /* SUM might be identical to either operand, so don't store the + result there until we are finished with the input operands. We + dare to overwrite the numerator of SUM when we are finished + with the numerators of A1 and A2. */ + + mpz_gcd (&gcd1, &(a1->den), &(a2->den)); + if (gcd1.size > 1 || gcd1.d[0] != 1) + { + MP_INT t; + + mpz_init (&t); + + mpz_div (&tmp1, &(a2->den), &gcd1); + mpz_mul (&tmp1, &(a1->num), &tmp1); + + mpz_div (&tmp2, &(a1->den), &gcd1); + mpz_mul (&tmp2, &(a2->num), &tmp2); + + mpz_add (&t, &tmp1, &tmp2); + mpz_gcd (&gcd2, &t, &gcd1); + + mpz_div (&(sum->num), &t, &gcd2); + + mpz_div (&tmp1, &(a1->den), &gcd1); + mpz_div (&tmp2, &(a2->den), &gcd2); + mpz_mul (&(sum->den), &tmp1, &tmp2); + + mpz_clear (&t); + } + else + { + /* The common divisior is 1. This is the case (for random input) with + probability 6/(pi**2). */ + mpz_mul (&tmp1, &(a1->num), &(a2->den)); + mpz_mul (&tmp2, &(a2->num), &(a1->den)); + mpz_add (&(sum->num), &tmp1, &tmp2); + mpz_mul (&(sum->den), &(a1->den), &(a2->den)); + } + + mpz_clear (&tmp2); + mpz_clear (&tmp1); + mpz_clear (&gcd2); + mpz_clear (&gcd1); +} |