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/* mpfr_dump, mpfr_fdump -- dump a float (for the tests and debugging purpose)
Copyright 1999-2021 Free Software Foundation, Inc.
Contributed by the AriC and Caramba 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 3 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.LESSER. If not, see
https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include "mpfr-impl.h"
/* mpfr_dump is mainly for debugging purpose. It outputs a MPFR number
* in some unspecified format, then a newline character. This function
* is part of the API, but the output format may change without breaking
* the ABI.
*
* Since this is for debugging, it can detect invalid data (or UBF), and
* in such a case, it outputs information between exclamation marks:
* - 'N': the number is not normalized (MSB = 0);
* - 'T': there are non-zero trailing bits (output in square brackets);
* - 'U': this is an UBF number (internal use only);
* - '<': the exponent is < the current emin;
* - '>': the exponent is > the current emax.
*
* The format may depend on MPFR_* environment variables. For instance,
* in the future, some environment variables could specify prefix and
* suffix strings to colorize parts of the output that correspond to
* invalid data.
*/
void
mpfr_fdump (FILE *stream, mpfr_srcptr x)
{
if (MPFR_IS_NEG (x))
fprintf (stream, "-");
if (MPFR_IS_NAN (x))
fprintf (stream, "@NaN@");
else if (MPFR_IS_INF (x))
fprintf (stream, "@Inf@");
else if (MPFR_IS_ZERO (x))
fprintf (stream, "0");
else
{
mp_limb_t *mx;
mpfr_prec_t px;
mp_size_t n;
char invalid[4];
int first = 1, i = 0;
mx = MPFR_MANT (x);
px = MPFR_PREC (x);
fprintf (stream, "0.");
for (n = (px - 1) / GMP_NUMB_BITS; n >= 0; n--)
{
mp_limb_t wd, t;
wd = mx[n];
if (first)
{
if (! MPFR_LIMB_MSB (wd))
invalid[i++] = 'N';
first = 0;
}
for (t = MPFR_LIMB_HIGHBIT; t != 0; t >>= 1)
{
putc ((wd & t) == 0 ? '0' : '1', stream);
if (--px == 0)
{
MPFR_ASSERTD (n == 0);
if (t != 0 && (wd & (t - 1)) != 0)
{
putc ('[', stream);
invalid[i++] = 'T';
}
else
break; /* the trailing bits (all 0's) are not output */
}
}
}
if (px < 0) /* there are non-zero trailing bits */
putc (']', stream);
if (MPFR_IS_UBF (x))
{
#ifndef MPFR_USE_MINI_GMP
gmp_fprintf (stream, "E%Zd", MPFR_ZEXP (x));
#else /* mini-gmp has no gmp_fprintf */
fprintf (stream, "E");
mpz_out_str (stream, 10, MPFR_ZEXP (x));
#endif
invalid[i++] = 'U';
}
else
{
mpfr_exp_t e = MPFR_EXP (x);
fprintf (stream, "E%" MPFR_EXP_FSPEC "d", (mpfr_eexp_t) e);
if (e < __gmpfr_emin)
invalid[i++] = '<';
else if (e > __gmpfr_emax)
invalid[i++] = '>';
}
if (i != 0)
{
invalid[i] = '\0';
fprintf (stream, "!!!%s!!!", invalid);
}
}
putc ('\n', stream);
}
void
mpfr_dump (mpfr_srcptr x)
{
mpfr_fdump (stdout, x);
}
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