| /* mpfr_get_uj -- convert a MPFR number to a huge machine unsigned integer |
| |
| Copyright 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
| Contributed by the Arenaire and Cacao projects, INRIA. |
| |
| This file is part of the GNU MPFR Library. |
| |
| The GNU MPFR 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 2.1 of the License, or (at your |
| option) any later version. |
| |
| The GNU MPFR 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 MPFR Library; see the file COPYING.LIB. If not, write to |
| the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
| MA 02110-1301, USA. */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include "config.h" /* for a build within gmp */ |
| #endif |
| |
| /* The ISO C99 standard specifies that in C++ implementations the |
| INTMAX_MAX, ... macros should only be defined if explicitly requested. */ |
| #if defined __cplusplus |
| # define __STDC_LIMIT_MACROS |
| # define __STDC_CONSTANT_MACROS |
| #endif |
| |
| #if HAVE_INTTYPES_H |
| # include <inttypes.h> /* for intmax_t */ |
| #else |
| # if HAVE_STDINT_H |
| # include <stdint.h> |
| # endif |
| #endif |
| |
| #include "mpfr-impl.h" |
| |
| #ifdef _MPFR_H_HAVE_INTMAX_T |
| |
| uintmax_t |
| mpfr_get_uj (mpfr_srcptr f, mpfr_rnd_t rnd) |
| { |
| uintmax_t r; |
| mp_prec_t prec; |
| mpfr_t x; |
| |
| if (!mpfr_fits_uintmax_p (f, rnd)) |
| { |
| MPFR_SET_ERANGE (); |
| return MPFR_IS_NEG (f) ? (uintmax_t) 0 : UINTMAX_MAX; |
| } |
| |
| if (MPFR_IS_ZERO (f)) |
| return (uintmax_t) 0; |
| |
| /* determine the precision of uintmax_t */ |
| for (r = UINTMAX_MAX, prec = 0; r != 0; r /= 2, prec++) |
| { } |
| |
| /* Now, r = 0. */ |
| |
| mpfr_init2 (x, prec); |
| mpfr_rint (x, f, rnd); |
| MPFR_ASSERTN (MPFR_IS_FP (x)); |
| |
| if (MPFR_NOTZERO (x)) |
| { |
| mp_limb_t *xp; |
| int sh, n; /* An int should be sufficient in this context. */ |
| |
| MPFR_ASSERTN (MPFR_IS_POS (x)); |
| xp = MPFR_MANT (x); |
| sh = MPFR_GET_EXP (x); |
| MPFR_ASSERTN ((mp_prec_t) sh <= prec); |
| for (n = MPFR_LIMB_SIZE(x) - 1; n >= 0; n--) |
| { |
| sh -= BITS_PER_MP_LIMB; |
| r += (sh >= 0 |
| ? (uintmax_t) xp[n] << sh |
| : (uintmax_t) xp[n] >> (- sh)); |
| } |
| } |
| |
| mpfr_clear (x); |
| |
| return r; |
| } |
| |
| #endif |