108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/* mpf_out_str (stream, base, n_digits, op) -- Print N_DIGITS digits from
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the float OP to STREAM in base BASE. Return the number of characters
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written, or 0 if an error occurred.
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Copyright 1996, 1997, 2001, 2002, 2005 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#define _GNU_SOURCE /* for DECIMAL_POINT in langinfo.h */
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#if HAVE_LANGINFO_H
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#include <langinfo.h> /* for nl_langinfo */
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#endif
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#if HAVE_LOCALE_H
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#include <locale.h> /* for localeconv */
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#endif
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#include "gmp.h"
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#include "gmp-impl.h"
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size_t
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mpf_out_str (FILE *stream, int base, size_t n_digits, mpf_srcptr op)
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{
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char *str;
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mp_exp_t exp;
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size_t written;
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TMP_DECL;
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TMP_MARK;
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if (base == 0)
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base = 10;
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if (n_digits == 0)
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MPF_SIGNIFICANT_DIGITS (n_digits, base, op->_mp_prec);
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if (stream == 0)
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stream = stdout;
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/* Consider these changes:
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* Don't allocate memory here for huge n_digits; pass NULL to mpf_get_str.
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* Make mpf_get_str allocate extra space when passed NULL, to avoid
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allocating two huge string buffers.
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* Implement more/other allocation reductions tricks. */
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str = (char *) TMP_ALLOC (n_digits + 2); /* extra for minus sign and \0 */
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mpf_get_str (str, &exp, base, n_digits, op);
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n_digits = strlen (str);
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written = 0;
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/* Write sign */
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if (str[0] == '-')
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{
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str++;
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fputc ('-', stream);
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written = 1;
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n_digits--;
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}
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{
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const char *point = GMP_DECIMAL_POINT;
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size_t pointlen = strlen (point);
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putc ('0', stream);
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fwrite (point, 1, pointlen, stream);
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written += pointlen + 1;
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}
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/* Write mantissa */
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{
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size_t fwret;
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fwret = fwrite (str, 1, n_digits, stream);
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written += fwret;
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}
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/* Write exponent */
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{
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int fpret;
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fpret = fprintf (stream, (base <= 10 ? "e%ld" : "@%ld"), exp);
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written += fpret;
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}
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TMP_FREE;
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return ferror (stream) ? 0 : written;
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}
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