1
/* mpfr_get_uj -- convert a MPFR number to a huge machine unsigned integer
3
Copyright 2004 Free Software Foundation, Inc.
5
This file is part of the MPFR Library.
7
The MPFR Library is free software; you can redistribute it and/or modify
8
it under the terms of the GNU Lesser General Public License as published by
9
the Free Software Foundation; either version 2.1 of the License, or (at your
10
option) any later version.
12
The MPFR Library is distributed in the hope that it will be useful, but
13
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15
License for more details.
17
You should have received a copy of the GNU Lesser General Public License
18
along with the MPFR Library; see the file COPYING.LIB. If not, write to
19
the Free Software Foundation, Inc., 51 Franklin Place, Fifth Floor, Boston,
20
MA 02110-1301, USA. */
23
# include "config.h" /* for a build within gmp */
26
/* The ISO C99 standard specifies that in C++ implementations the
27
INTMAX_MAX, ... macros should only be defined if explicitly requested. */
28
#if defined __cplusplus
29
# define __STDC_LIMIT_MACROS
30
# define __STDC_CONSTANT_MACROS
36
#ifdef HAVE_INTTYPES_H
37
# include <inttypes.h>
40
#include "mpfr-impl.h"
42
#ifdef _MPFR_H_HAVE_INTMAX_T
45
mpfr_get_uj (mpfr_srcptr f, mpfr_rnd_t rnd)
51
if (!mpfr_fits_uintmax_p (f, rnd))
54
return MPFR_IS_NEG (f) ? (uintmax_t) 0 : UINTMAX_MAX;
60
/* determine the precision of uintmax_t */
61
for (r = UINTMAX_MAX, prec = 0; r != 0; r /= 2, prec++)
67
mpfr_rint (x, f, rnd);
68
MPFR_ASSERTN (MPFR_IS_FP (x));
73
int sh, n; /* An int should be sufficient in this context. */
75
MPFR_ASSERTN (MPFR_IS_POS (x));
77
sh = MPFR_GET_EXP (x);
78
MPFR_ASSERTN ((mp_prec_t) sh <= prec);
79
for (n = MPFR_LIMB_SIZE(x) - 1; n >= 0; n--)
81
sh -= BITS_PER_MP_LIMB;
83
? (uintmax_t) xp[n] << sh
84
: (uintmax_t) xp[n] >> (- sh));