Viewing file:  out_str.c (2.97 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* mpfr_out_str -- output a floating-point number to a stream
Copyright 1999, 2001-2002, 2004, 2006-2020 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"
/* Warning! S should not contain "%". */
#define OUT_STR_RET(S) \
do \
{ \
int r; \
r = fprintf (stream, (S)); \
return r < 0 ? 0 : r; \
} \
while (0)
size_t
mpfr_out_str (FILE *stream, int base, size_t n_digits, mpfr_srcptr op,
mpfr_rnd_t rnd_mode)
{
char *s, *s0;
size_t l;
mpfr_exp_t e;
int err, r;
MPFR_ASSERTN ((base >= -36 && base <= -2) || (base >= 2 && base <= 62));
if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (op)))
{
if (MPFR_IS_NAN (op))
OUT_STR_RET ("@NaN@");
else if (MPFR_IS_INF (op))
OUT_STR_RET (MPFR_IS_POS (op) ? "@Inf@" : "-@Inf@");
else
{
MPFR_ASSERTD (MPFR_IS_ZERO (op));
OUT_STR_RET (MPFR_IS_POS (op) ? "0" : "-0");
}
}
s = mpfr_get_str (NULL, &e, base, n_digits, op, rnd_mode);
s0 = s;
/* for op=3.1416 we have s = "31416" and e = 1 */
l = strlen (s) + 1; /* size of allocated block returned by mpfr_get_str
- may be incorrect, as only an upper bound? */
/* outputs possible sign and significand */
err = (*s == '-' && fputc (*s++, stream) == EOF)
|| fputc (*s++, stream) == EOF /* leading digit */
|| fputc ((unsigned char) MPFR_DECIMAL_POINT, stream) == EOF
|| fputs (s, stream) == EOF; /* trailing significand */
mpfr_free_func (s0, l);
if (MPFR_UNLIKELY (err))
return 0;
e--; /* due to the leading digit */
/* outputs exponent */
r = fprintf (stream, (base <= 10 ?
"e%" MPFR_EXP_FSPEC "d" :
"@%" MPFR_EXP_FSPEC "d"), (mpfr_eexp_t) e);
/* Check error from fprintf or integer overflow (wrapping) on size_t */
if (MPFR_UNLIKELY (r < 0 || l + r < l))
return 0;
return l + r;
}
|
