14a238c70SJohn Marino /* mpfr_check -- Check if a floating-point number has not been corrupted.
24a238c70SJohn Marino
3*ab6d115fSJohn Marino Copyright 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
4*ab6d115fSJohn Marino Contributed by the AriC and Caramel projects, INRIA.
54a238c70SJohn Marino
64a238c70SJohn Marino This file is part of the GNU MPFR Library.
74a238c70SJohn Marino
84a238c70SJohn Marino The GNU MPFR Library is free software; you can redistribute it and/or modify
94a238c70SJohn Marino it under the terms of the GNU Lesser General Public License as published by
104a238c70SJohn Marino the Free Software Foundation; either version 3 of the License, or (at your
114a238c70SJohn Marino option) any later version.
124a238c70SJohn Marino
134a238c70SJohn Marino The GNU MPFR Library is distributed in the hope that it will be useful, but
144a238c70SJohn Marino WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
154a238c70SJohn Marino or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
164a238c70SJohn Marino License for more details.
174a238c70SJohn Marino
184a238c70SJohn Marino You should have received a copy of the GNU Lesser General Public License
194a238c70SJohn Marino along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
204a238c70SJohn Marino http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
214a238c70SJohn Marino 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
224a238c70SJohn Marino
234a238c70SJohn Marino #include "mpfr-impl.h"
244a238c70SJohn Marino
254a238c70SJohn Marino /*
264a238c70SJohn Marino * Check if x is a valid mpfr_t initializes by mpfr_init
274a238c70SJohn Marino * Returns 0 if isn't valid
284a238c70SJohn Marino */
294a238c70SJohn Marino int
mpfr_check(mpfr_srcptr x)304a238c70SJohn Marino mpfr_check (mpfr_srcptr x)
314a238c70SJohn Marino {
324a238c70SJohn Marino mp_size_t s, i;
334a238c70SJohn Marino mp_limb_t tmp;
344a238c70SJohn Marino volatile mp_limb_t *xm;
354a238c70SJohn Marino int rw;
364a238c70SJohn Marino
374a238c70SJohn Marino /* Check Sign */
384a238c70SJohn Marino if (MPFR_SIGN(x) != MPFR_SIGN_POS && MPFR_SIGN(x) != MPFR_SIGN_NEG)
394a238c70SJohn Marino return 0;
404a238c70SJohn Marino /* Check Precision */
414a238c70SJohn Marino if ( (MPFR_PREC(x) < MPFR_PREC_MIN) || (MPFR_PREC(x) > MPFR_PREC_MAX))
424a238c70SJohn Marino return 0;
434a238c70SJohn Marino /* Check Mantissa */
444a238c70SJohn Marino xm = MPFR_MANT(x);
454a238c70SJohn Marino if (!xm)
464a238c70SJohn Marino return 0;
474a238c70SJohn Marino /* Check size of mantissa */
484a238c70SJohn Marino s = MPFR_GET_ALLOC_SIZE(x);
494a238c70SJohn Marino if (s<=0 || s > MP_SIZE_T_MAX ||
504a238c70SJohn Marino MPFR_PREC(x) > ((mpfr_prec_t)s*GMP_NUMB_BITS))
514a238c70SJohn Marino return 0;
524a238c70SJohn Marino /* Acces all the mp_limb of the mantissa: may do a seg fault */
534a238c70SJohn Marino for(i = 0 ; i < s ; i++)
544a238c70SJohn Marino tmp = xm[i];
554a238c70SJohn Marino /* Check if it isn't singular*/
564a238c70SJohn Marino if (! MPFR_IS_SINGULAR (x))
574a238c70SJohn Marino {
584a238c70SJohn Marino /* Check first mp_limb of mantissa (Must start with a 1 bit) */
594a238c70SJohn Marino if ( ((xm[MPFR_LIMB_SIZE(x)-1])>>(GMP_NUMB_BITS-1)) == 0)
604a238c70SJohn Marino return 0;
614a238c70SJohn Marino /* Check last mp_limb of mantissa */
624a238c70SJohn Marino rw = (MPFR_PREC(x) % GMP_NUMB_BITS);
634a238c70SJohn Marino if (rw != 0)
644a238c70SJohn Marino {
654a238c70SJohn Marino tmp = MPFR_LIMB_MASK (GMP_NUMB_BITS - rw);
664a238c70SJohn Marino if ((xm[0] & tmp) != 0)
674a238c70SJohn Marino return 0;
684a238c70SJohn Marino }
694a238c70SJohn Marino /* Check exponent range */
704a238c70SJohn Marino if ((MPFR_EXP (x) < __gmpfr_emin) || (MPFR_EXP (x) > __gmpfr_emax))
714a238c70SJohn Marino return 0;
724a238c70SJohn Marino }
734a238c70SJohn Marino else
744a238c70SJohn Marino {
754a238c70SJohn Marino /* Singular value is zero, inf or nan */
764a238c70SJohn Marino MPFR_ASSERTD(MPFR_IS_ZERO(x) || MPFR_IS_NAN(x) || MPFR_IS_INF(x));
774a238c70SJohn Marino }
784a238c70SJohn Marino return 1;
794a238c70SJohn Marino }
804a238c70SJohn Marino
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