| /* mpfr_out_str -- output a floating-point number to a stream |
| |
| Copyright 1999, 2001, 2002, 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
| Contributed by the Arenaire and Cacao 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 2.1 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.LIB. If not, write to |
| the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
| MA 02110-1301, USA. */ |
| |
| #include <string.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; |
| |
| MPFR_ASSERTN (base >= 2 && base <= 36); |
| |
| /* 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 ((unsigned char) MPFR_DECIMAL_POINT, stream); |
| 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; |
| } |