| /* mpfr_out_str -- output a floating-point number to a stream |
| |
| Copyright 1999, 2001, 2002, 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc. |
| Contributed by the AriC and Caramel 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 |
| http://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; |
| |
| MPFR_ASSERTN (base >= 2 && base <= 62); |
| |
| /* when stream=NULL, output to stdout */ |
| if (stream == NULL) |
| stream = stdout; |
| |
| 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 */ |
| (*__gmp_free_func) (s0, l); |
| if (MPFR_UNLIKELY (err)) |
| return 0; |
| |
| e--; /* due to the leading digit */ |
| |
| /* outputs exponent */ |
| if (e) |
| { |
| int r; |
| |
| MPFR_ASSERTN(e >= LONG_MIN); |
| MPFR_ASSERTN(e <= LONG_MAX); |
| |
| r = fprintf (stream, (base <= 10 ? "e%ld" : "@%ld"), (long) e); |
| if (MPFR_UNLIKELY (r < 0)) |
| return 0; |
| |
| l += r; |
| } |
| |
| return l; |
| } |