14a238c70SJohn Marino /* mpfr_out_str -- output a floating-point number to a stream
24a238c70SJohn Marino
3*ab6d115fSJohn Marino Copyright 1999, 2001, 2002, 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
4*ab6d115fSJohn Marino Contributed by the AriC and Caramel projects, INRIA.
54a238c70SJohn Marino
64a238c70SJohn Marino This file is part of the GNU MPFR Library.
74a238c70SJohn Marino
84a238c70SJohn Marino The GNU MPFR Library is free software; you can redistribute it and/or modify
94a238c70SJohn Marino it under the terms of the GNU Lesser General Public License as published by
104a238c70SJohn Marino the Free Software Foundation; either version 3 of the License, or (at your
114a238c70SJohn Marino option) any later version.
124a238c70SJohn Marino
134a238c70SJohn Marino The GNU MPFR Library is distributed in the hope that it will be useful, but
144a238c70SJohn Marino WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
154a238c70SJohn Marino or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
164a238c70SJohn Marino License for more details.
174a238c70SJohn Marino
184a238c70SJohn Marino You should have received a copy of the GNU Lesser General Public License
194a238c70SJohn Marino along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
204a238c70SJohn Marino http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
214a238c70SJohn Marino 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
224a238c70SJohn Marino
234a238c70SJohn Marino #include "mpfr-impl.h"
244a238c70SJohn Marino
254a238c70SJohn Marino /* Warning! S should not contain "%". */
264a238c70SJohn Marino #define OUT_STR_RET(S) \
274a238c70SJohn Marino do \
284a238c70SJohn Marino { \
294a238c70SJohn Marino int r; \
304a238c70SJohn Marino r = fprintf (stream, (S)); \
314a238c70SJohn Marino return r < 0 ? 0 : r; \
324a238c70SJohn Marino } \
334a238c70SJohn Marino while (0)
344a238c70SJohn Marino
354a238c70SJohn Marino size_t
mpfr_out_str(FILE * stream,int base,size_t n_digits,mpfr_srcptr op,mpfr_rnd_t rnd_mode)364a238c70SJohn Marino mpfr_out_str (FILE *stream, int base, size_t n_digits, mpfr_srcptr op,
374a238c70SJohn Marino mpfr_rnd_t rnd_mode)
384a238c70SJohn Marino {
394a238c70SJohn Marino char *s, *s0;
404a238c70SJohn Marino size_t l;
414a238c70SJohn Marino mpfr_exp_t e;
424a238c70SJohn Marino int err;
434a238c70SJohn Marino
444a238c70SJohn Marino MPFR_ASSERTN (base >= 2 && base <= 62);
454a238c70SJohn Marino
464a238c70SJohn Marino /* when stream=NULL, output to stdout */
474a238c70SJohn Marino if (stream == NULL)
484a238c70SJohn Marino stream = stdout;
494a238c70SJohn Marino
504a238c70SJohn Marino if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (op)))
514a238c70SJohn Marino {
524a238c70SJohn Marino if (MPFR_IS_NAN (op))
534a238c70SJohn Marino OUT_STR_RET ("@NaN@");
544a238c70SJohn Marino else if (MPFR_IS_INF (op))
554a238c70SJohn Marino OUT_STR_RET (MPFR_IS_POS (op) ? "@Inf@" : "-@Inf@");
564a238c70SJohn Marino else
574a238c70SJohn Marino {
584a238c70SJohn Marino MPFR_ASSERTD (MPFR_IS_ZERO (op));
594a238c70SJohn Marino OUT_STR_RET (MPFR_IS_POS (op) ? "0" : "-0");
604a238c70SJohn Marino }
614a238c70SJohn Marino }
624a238c70SJohn Marino
634a238c70SJohn Marino s = mpfr_get_str (NULL, &e, base, n_digits, op, rnd_mode);
644a238c70SJohn Marino
654a238c70SJohn Marino s0 = s;
664a238c70SJohn Marino /* for op=3.1416 we have s = "31416" and e = 1 */
674a238c70SJohn Marino
684a238c70SJohn Marino l = strlen (s) + 1; /* size of allocated block returned by mpfr_get_str
694a238c70SJohn Marino - may be incorrect, as only an upper bound? */
704a238c70SJohn Marino
714a238c70SJohn Marino /* outputs possible sign and significand */
724a238c70SJohn Marino err = (*s == '-' && fputc (*s++, stream) == EOF)
734a238c70SJohn Marino || fputc (*s++, stream) == EOF /* leading digit */
744a238c70SJohn Marino || fputc ((unsigned char) MPFR_DECIMAL_POINT, stream) == EOF
754a238c70SJohn Marino || fputs (s, stream) == EOF; /* trailing significand */
764a238c70SJohn Marino (*__gmp_free_func) (s0, l);
774a238c70SJohn Marino if (MPFR_UNLIKELY (err))
784a238c70SJohn Marino return 0;
794a238c70SJohn Marino
804a238c70SJohn Marino e--; /* due to the leading digit */
814a238c70SJohn Marino
824a238c70SJohn Marino /* outputs exponent */
834a238c70SJohn Marino if (e)
844a238c70SJohn Marino {
854a238c70SJohn Marino int r;
864a238c70SJohn Marino
874a238c70SJohn Marino MPFR_ASSERTN(e >= LONG_MIN);
884a238c70SJohn Marino MPFR_ASSERTN(e <= LONG_MAX);
894a238c70SJohn Marino
904a238c70SJohn Marino r = fprintf (stream, (base <= 10 ? "e%ld" : "@%ld"), (long) e);
914a238c70SJohn Marino if (MPFR_UNLIKELY (r < 0))
924a238c70SJohn Marino return 0;
934a238c70SJohn Marino
944a238c70SJohn Marino l += r;
954a238c70SJohn Marino }
964a238c70SJohn Marino
974a238c70SJohn Marino return l;
984a238c70SJohn Marino }
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