1 /* mpf_urandomb (rop, state, nbits) -- Generate a uniform pseudorandom
2 real number between 0 (inclusive) and 1 (exclusive) of size NBITS,
3 using STATE as the random state previously initialized by a call to
6 Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
8 This file is part of the GNU MP Library.
10 The GNU MP Library is free software; you can redistribute it and/or modify
11 it under the terms of the GNU Lesser General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or (at your
13 option) any later version.
15 The GNU MP Library is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
18 License for more details.
20 You should have received a copy of the GNU Lesser General Public License
21 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
27 mpf_urandomb (mpf_t rop, gmp_randstate_t rstate, mp_bitcnt_t nbits)
35 nlimbs = BITS_TO_LIMBS (nbits);
38 if (nlimbs > prec + 1 || nlimbs == 0)
41 nbits = nlimbs * GMP_NUMB_BITS;
44 _gmp_rand (rp, rstate, nbits);
46 /* If nbits isn't a multiple of GMP_NUMB_BITS, shift up. */
47 if (nbits % GMP_NUMB_BITS != 0)
48 mpn_lshift (rp, rp, nlimbs, GMP_NUMB_BITS - nbits % GMP_NUMB_BITS);
51 while (nlimbs != 0 && rp[nlimbs - 1] == 0)