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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_div.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_div.c')
-rw-r--r-- | gnu/lib/libgmp/mpq_div.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/gnu/lib/libgmp/mpq_div.c b/gnu/lib/libgmp/mpq_div.c new file mode 100644 index 0000000..f08aa27 --- /dev/null +++ b/gnu/lib/libgmp/mpq_div.c @@ -0,0 +1,92 @@ +/* mpq_div -- divide 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_div (MP_RAT *quot, const MP_RAT *dividend, const MP_RAT *divisor) +#else +mpq_div (quot, dividend, divisor) + MP_RAT *quot; + const MP_RAT *dividend; + const MP_RAT *divisor; +#endif +{ + MP_INT gcd1, gcd2; + MP_INT tmp1, tmp2; + MP_INT numtmp; + + mpz_init (&gcd1); + mpz_init (&gcd2); + mpz_init (&tmp1); + mpz_init (&tmp2); + mpz_init (&numtmp); + + /* QUOT 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 QUOT when we are finished + with the numerators of DIVIDEND and DIVISOR. */ + + mpz_gcd (&gcd1, &(dividend->num), &(divisor->num)); + mpz_gcd (&gcd2, &(divisor->den), &(dividend->den)); + + if (gcd1.size > 1 || gcd1.d[0] != 1) + mpz_div (&tmp1, &(dividend->num), &gcd1); + else + mpz_set (&tmp1, &(dividend->num)); + + if (gcd2.size > 1 || gcd2.d[0] != 1) + mpz_div (&tmp2, &(divisor->den), &gcd2); + else + mpz_set (&tmp2, &(divisor->den)); + + mpz_mul (&numtmp, &tmp1, &tmp2); + + if (gcd1.size > 1 || gcd1.d[0] != 1) + mpz_div (&tmp1, &(divisor->num), &gcd1); + else + mpz_set (&tmp1, &(divisor->num)); + + if (gcd2.size > 1 || gcd2.d[0] != 1) + mpz_div (&tmp2, &(dividend->den), &gcd2); + else + mpz_set (&tmp2, &(dividend->den)); + + mpz_mul (&(quot->den), &tmp1, &tmp2); + + /* We needed to go via NUMTMP to take care of QUOT being the same + as either input operands. Now move NUMTMP to QUOT->NUM. */ + mpz_set (&(quot->num), &numtmp); + + /* Keep the denominator positive. */ + if (quot->den.size < 0) + { + quot->den.size = -quot->den.size; + quot->num.size = -quot->num.size; + } + + mpz_clear (&numtmp); + mpz_clear (&tmp2); + mpz_clear (&tmp1); + mpz_clear (&gcd2); + mpz_clear (&gcd1); +} |