gcc/gmp/mpn/generic/random.c

/* mpn_random -- Generate random numbers.

Copyright 2001, 2002 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 http://www.gnu.org/licenses/.  */

#include "gmp.h"
#include "gmp-impl.h"

void
mpn_random (mp_ptr ptr, mp_size_t size)
{
  gmp_randstate_ptr  rands;

  /* FIXME: Is size==0 supposed to be allowed? */
  ASSERT (size >= 0);

  if (size == 0)
    return;

  rands = RANDS;
  _gmp_rand (ptr, rands, size * GMP_NUMB_BITS);

  /* Make sure the most significant limb is non-zero.  */
  while (ptr[size-1] == 0)
    _gmp_rand (&ptr[size-1], rands, GMP_NUMB_BITS);
}