pqc/external/flint-2.4.3/long_extras/randint.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
This file is part of FLINT.
FLINT 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 of the License, or
(at your option) any later version.
FLINT 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 FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2009 William Hart
Copyright (C) 2011 Sebastian Pancratz
******************************************************************************/
#include <limits.h>
#include "flint.h"
#include "ulong_extras.h"
mp_limb_t z_randint(flint_rand_t state, mp_limb_t limit)
{
mp_limb_t z;
if ((limit == UWORD(0)) || (limit > WORD_MAX))
limit = WORD_MAX;
z = n_randlimb(state) % limit;
if (n_randint(state, 2))
z = -z;
return z;
}