/* gmp_urandomb_ui -- random bits returned in a ulong.

Copyright 2003, 2004 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 either:

  * 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.

or

  * 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.

or both in parallel, as here.

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 copies of the GNU General Public License and 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"

/* Currently bits>=BITS_PER_ULONG is quietly truncated to BITS_PER_ULONG,

   maybe this should raise an exception or something.  */

unsigned long

gmp_urandomb_ui (gmp_randstate_ptr rstate, unsigned long bits)

{

  mp_limb_t  a[LIMBS_PER_ULONG];

  /* start with zeros, since if bits==0 then _gmp_rand will store nothing at

     all, or if bits <= GMP_NUMB_BITS then it will store only a[0] */

  a[0] = 0;

#if LIMBS_PER_ULONG > 1

  a[1] = 0;

#endif

  _gmp_rand (a, rstate, MIN (bits, BITS_PER_ULONG));

#if LIMBS_PER_ULONG == 1

  return a[0];

#else

  return a[0] | (a[1] << GMP_NUMB_BITS);

#endif

}