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/* mpf_random2 -- Generate a positive random mpf_t of specified size, with
long runs of consecutive ones and zeros in the binary representation.
Intended for testing of other MP routines.
Copyright 1995, 1996, 2001-2003 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 Lesser General Public License as published
by the Free Software Foundation; either version 3 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see https://www.gnu.org/licenses/. */
#include "gmp.h"
#include "gmp-impl.h"
void
mpf_random2 (mpf_ptr x, mp_size_t xs, mp_exp_t exp)
{
mp_size_t xn;
mp_size_t prec;
mp_limb_t elimb;
xn = ABS (xs);
prec = PREC(x);
if (xn == 0)
{
EXP(x) = 0;
SIZ(x) = 0;
return;
}
if (xn > prec + 1)
xn = prec + 1;
/* General random mantissa. */
mpn_random2 (PTR(x), xn);
/* Generate random exponent. */
_gmp_rand (&elimb, RANDS, GMP_NUMB_BITS);
exp = ABS (exp);
exp = elimb % (2 * exp + 1) - exp;
EXP(x) = exp;
SIZ(x) = xs < 0 ? -xn : xn;
}
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