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/* mpf_out_str (stream, base, n_digits, op) -- Print N_DIGITS digits from
the float OP to STREAM in base BASE. Return the number of characters
written, or 0 if an error occurred.
Copyright 1996, 1997, 2001, 2002, 2005, 2011 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP 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 MP 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 MP Library. If not, see https://www.gnu.org/licenses/. */
#define _GNU_SOURCE /* for DECIMAL_POINT in langinfo.h */
#include "config.h"
#include <stdio.h>
#include <string.h>
#if HAVE_LANGINFO_H
#include <langinfo.h> /* for nl_langinfo */
#endif
#if HAVE_LOCALE_H
#include <locale.h> /* for localeconv */
#endif
#include "gmp.h"
#include "gmp-impl.h"
#include "longlong.h"
size_t
mpf_out_str (FILE *stream, int base, size_t n_digits, mpf_srcptr op)
{
char *str;
mp_exp_t exp;
size_t written;
TMP_DECL;
TMP_MARK;
if (base == 0)
base = 10;
if (n_digits == 0)
MPF_SIGNIFICANT_DIGITS (n_digits, base, op->_mp_prec);
if (stream == 0)
stream = stdout;
/* Consider these changes:
* Don't allocate memory here for huge n_digits; pass NULL to mpf_get_str.
* Make mpf_get_str allocate extra space when passed NULL, to avoid
allocating two huge string buffers.
* Implement more/other allocation reductions tricks. */
str = (char *) TMP_ALLOC (n_digits + 2); /* extra for minus sign and \0 */
mpf_get_str (str, &exp, base, n_digits, op);
n_digits = strlen (str);
written = 0;
/* Write sign */
if (str[0] == '-')
{
str++;
fputc ('-', stream);
written = 1;
n_digits--;
}
{
const char *point = GMP_DECIMAL_POINT;
size_t pointlen = strlen (point);
putc ('0', stream);
fwrite (point, 1, pointlen, stream);
written += pointlen + 1;
}
/* Write mantissa */
{
size_t fwret;
fwret = fwrite (str, 1, n_digits, stream);
written += fwret;
}
/* Write exponent */
{
int fpret;
fpret = fprintf (stream, (base <= 10 ? "e%ld" : "@%ld"), exp);
written += fpret;
}
TMP_FREE;
return ferror (stream) ? 0 : written;
}
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