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4c74403188
Change-Id: Iae65e95cfa0d92091b8b0a424ae36d88efa76aa9 Reviewed-on: https://review.haiku-os.org/c/buildtools/+/3020 Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/* mpf_urandomb (rop, state, nbits) -- Generate a uniform pseudorandom
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real number between 0 (inclusive) and 1 (exclusive) of size NBITS,
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using STATE as the random state previously initialized by a call to
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gmp_randinit().
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Copyright 1999-2002 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any
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later version.
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or both in parallel, as here.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received copies of the GNU General Public License and the
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GNU Lesser General Public License along with the GNU MP Library. If not,
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see https://www.gnu.org/licenses/. */
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#include "gmp-impl.h"
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void
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mpf_urandomb (mpf_t rop, gmp_randstate_t rstate, mp_bitcnt_t nbits)
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{
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mp_ptr rp;
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mp_size_t nlimbs;
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mp_exp_t exp;
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mp_size_t prec;
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rp = PTR (rop);
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nlimbs = BITS_TO_LIMBS (nbits);
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prec = PREC (rop);
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if (nlimbs > prec + 1 || nlimbs == 0)
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{
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nlimbs = prec + 1;
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nbits = nlimbs * GMP_NUMB_BITS;
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}
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_gmp_rand (rp, rstate, nbits);
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/* If nbits isn't a multiple of GMP_NUMB_BITS, shift up. */
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if (nbits % GMP_NUMB_BITS != 0)
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mpn_lshift (rp, rp, nlimbs, GMP_NUMB_BITS - nbits % GMP_NUMB_BITS);
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exp = 0;
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while (nlimbs != 0 && rp[nlimbs - 1] == 0)
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{
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nlimbs--;
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exp--;
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}
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EXP (rop) = exp;
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SIZ (rop) = nlimbs;
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}
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