mirror of
https://review.haiku-os.org/buildtools
synced 2025-01-19 21:01:18 +01:00
99d8158635
git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@29042 a95241bf-73f2-0310-859d-f6bbb57e9c96
81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/* mpfr_check -- Check if a floating-point number has not been corrupted.
|
|
|
|
Copyright 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
|
|
Contributed by the Arenaire and Cacao projects, INRIA.
|
|
|
|
This file is part of the MPFR Library.
|
|
|
|
The 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 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 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. */
|
|
|
|
#include "mpfr-impl.h"
|
|
|
|
/*
|
|
* Check if x is a valid mpfr_t initializes by mpfr_init
|
|
* Returns 0 if isn't valid
|
|
*/
|
|
int
|
|
mpfr_check (mpfr_srcptr x)
|
|
{
|
|
mp_size_t s, i;
|
|
mp_limb_t tmp;
|
|
volatile mp_limb_t *xm;
|
|
int rw;
|
|
|
|
/* Check Sign */
|
|
if (MPFR_SIGN(x) != MPFR_SIGN_POS && MPFR_SIGN(x) != MPFR_SIGN_NEG)
|
|
return 0;
|
|
/* Check Precision */
|
|
if ( (MPFR_PREC(x) < MPFR_PREC_MIN) || (MPFR_PREC(x) > MPFR_PREC_MAX))
|
|
return 0;
|
|
/* Check Mantissa */
|
|
xm = MPFR_MANT(x);
|
|
if (!xm)
|
|
return 0;
|
|
/* Check size of mantissa */
|
|
s = MPFR_GET_ALLOC_SIZE(x);
|
|
if (s<=0 || s > MP_SIZE_T_MAX ||
|
|
MPFR_PREC(x) > ((mp_prec_t)s*BITS_PER_MP_LIMB))
|
|
return 0;
|
|
/* Acces all the mp_limb of the mantissa: may do a seg fault */
|
|
for(i = 0 ; i < s ; i++)
|
|
tmp = xm[i];
|
|
/* Check if it isn't singular*/
|
|
if (MPFR_IS_PURE_FP(x))
|
|
{
|
|
/* Check first mp_limb of mantissa (Must start with a 1 bit) */
|
|
if ( ((xm[MPFR_LIMB_SIZE(x)-1])>>(BITS_PER_MP_LIMB-1)) == 0)
|
|
return 0;
|
|
/* Check last mp_limb of mantissa */
|
|
rw = (MPFR_PREC(x) % BITS_PER_MP_LIMB);
|
|
if (rw != 0)
|
|
{
|
|
tmp = MPFR_LIMB_MASK (BITS_PER_MP_LIMB - rw);
|
|
if ((xm[0] & tmp) != 0)
|
|
return 0;
|
|
}
|
|
/* Check exponent range */
|
|
if ((MPFR_EXP (x) < __gmpfr_emin) || (MPFR_EXP (x) > __gmpfr_emax))
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
/* Singular value is zero, inf or nan */
|
|
MPFR_ASSERTD(MPFR_IS_ZERO(x) || MPFR_IS_NAN(x) || MPFR_IS_INF(x));
|
|
}
|
|
return 1;
|
|
}
|
|
|