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/* mpfr_out_str -- output a floating-point number to a stream
Copyright 1999, 2001, 2002 Free Software Foundation, Inc.
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., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "mpfr.h"
#include "mpfr-impl.h"
size_t
mpfr_out_str (FILE *stream, int base, size_t n_digits, mpfr_srcptr op,
mp_rnd_t rnd_mode)
{
char *s, *s0;
size_t l;
mp_exp_t e;
/* when stream=NULL, output to stdout */
if (stream == NULL)
stream = stdout;
if (MPFR_IS_NAN(op))
{
fprintf (stream, "@NaN@");
return 3;
}
if (MPFR_IS_INF(op))
{
if (MPFR_SIGN(op) > 0)
{
fprintf (stream, "@Inf@");
return 3;
}
else
{
fprintf (stream, "-@Inf@");
return 4;
}
}
if (MPFR_IS_ZERO(op))
{
if (MPFR_SIGN(op) > 0)
{
fprintf(stream, "0");
return 1;
}
else
{
fprintf(stream, "-0");
return 2;
}
}
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? */
if (*s == '-')
fputc (*s++, stream);
/* outputs mantissa */
fputc (*s++, stream); e--; /* leading digit */
fputc ('.', stream); /* decimal point */
fputs (s, stream); /* rest of mantissa */
(*__gmp_free_func) (s0, l);
/* outputs exponent */
if (e)
{
MPFR_ASSERTN(e >= LONG_MIN);
MPFR_ASSERTN(e <= LONG_MAX);
l += fprintf (stream, (base <= 10 ? "e%ld" : "@%ld"), (long) e);
}
return l;
}
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