1 /* mpfr_get_uj -- convert a MPFR number to a huge machine unsigned integer 2 3 Copyright 2004, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. 4 Contributed by the Arenaire and Caramel projects, INRIA. 5 6 This file is part of the GNU MPFR Library. 7 8 The GNU MPFR Library is free software; you can redistribute it and/or modify 9 it under the terms of the GNU Lesser General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or (at your 11 option) any later version. 12 13 The GNU MPFR Library is distributed in the hope that it will be useful, but 14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 16 License for more details. 17 18 You should have received a copy of the GNU Lesser General Public License 19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see 20 http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., 21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ 22 23 #ifdef HAVE_CONFIG_H 24 # include "config.h" /* for a build within gmp */ 25 #endif 26 27 #include "mpfr-intmax.h" 28 #include "mpfr-impl.h" 29 30 #ifdef _MPFR_H_HAVE_INTMAX_T 31 32 uintmax_t 33 mpfr_get_uj (mpfr_srcptr f, mpfr_rnd_t rnd) 34 { 35 uintmax_t r; 36 mpfr_prec_t prec; 37 mpfr_t x; 38 39 if (MPFR_UNLIKELY (!mpfr_fits_uintmax_p (f, rnd))) 40 { 41 MPFR_SET_ERANGE (); 42 return MPFR_IS_NAN (f) || MPFR_IS_NEG (f) ? 43 (uintmax_t) 0 : MPFR_UINTMAX_MAX; 44 } 45 46 if (MPFR_IS_ZERO (f)) 47 return (uintmax_t) 0; 48 49 /* determine the precision of uintmax_t */ 50 for (r = MPFR_UINTMAX_MAX, prec = 0; r != 0; r /= 2, prec++) 51 { } 52 53 /* Now, r = 0. */ 54 55 mpfr_init2 (x, prec); 56 mpfr_rint (x, f, rnd); 57 MPFR_ASSERTN (MPFR_IS_FP (x)); 58 59 if (MPFR_NOTZERO (x)) 60 { 61 mp_limb_t *xp; 62 int sh, n; /* An int should be sufficient in this context. */ 63 64 MPFR_ASSERTN (MPFR_IS_POS (x)); 65 xp = MPFR_MANT (x); 66 sh = MPFR_GET_EXP (x); 67 MPFR_ASSERTN ((mpfr_prec_t) sh <= prec); 68 for (n = MPFR_LIMB_SIZE(x) - 1; n >= 0; n--) 69 { 70 sh -= GMP_NUMB_BITS; 71 r += (sh >= 0 72 ? (uintmax_t) xp[n] << sh 73 : (uintmax_t) xp[n] >> (- sh)); 74 } 75 } 76 77 mpfr_clear (x); 78 79 return r; 80 } 81 82 #endif 83