1 /* mpf_out_str (stream, base, n_digits, op) -- Print N_DIGITS digits from 2 the float OP to STREAM in base BASE. Return the number of characters 3 written, or 0 if an error occurred. 4 5 Copyright 1996, 1997, 2001, 2002, 2005 Free Software Foundation, Inc. 6 7 This file is part of the GNU MP Library. 8 9 The GNU MP Library is free software; you can redistribute it and/or modify 10 it under the terms of the GNU Lesser General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or (at your 12 option) any later version. 13 14 The GNU MP Library is distributed in the hope that it will be useful, but 15 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17 License for more details. 18 19 You should have received a copy of the GNU Lesser General Public License 20 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ 21 22 #define _GNU_SOURCE /* for DECIMAL_POINT in langinfo.h */ 23 24 #include "config.h" 25 26 #include <stdio.h> 27 #include <string.h> 28 29 #if HAVE_LANGINFO_H 30 #include <langinfo.h> /* for nl_langinfo */ 31 #endif 32 33 #if HAVE_LOCALE_H 34 #include <locale.h> /* for localeconv */ 35 #endif 36 37 #include "gmp.h" 38 #include "gmp-impl.h" 39 40 41 size_t 42 mpf_out_str (FILE *stream, int base, size_t n_digits, mpf_srcptr op) 43 { 44 char *str; 45 mp_exp_t exp; 46 size_t written; 47 TMP_DECL; 48 49 TMP_MARK; 50 51 if (base == 0) 52 base = 10; 53 if (n_digits == 0) 54 MPF_SIGNIFICANT_DIGITS (n_digits, base, op->_mp_prec); 55 56 if (stream == 0) 57 stream = stdout; 58 59 /* Consider these changes: 60 * Don't allocate memory here for huge n_digits; pass NULL to mpf_get_str. 61 * Make mpf_get_str allocate extra space when passed NULL, to avoid 62 allocating two huge string buffers. 63 * Implement more/other allocation reductions tricks. */ 64 65 str = (char *) TMP_ALLOC (n_digits + 2); /* extra for minus sign and \0 */ 66 67 mpf_get_str (str, &exp, base, n_digits, op); 68 n_digits = strlen (str); 69 70 written = 0; 71 72 /* Write sign */ 73 if (str[0] == '-') 74 { 75 str++; 76 fputc ('-', stream); 77 written = 1; 78 n_digits--; 79 } 80 81 { 82 const char *point = GMP_DECIMAL_POINT; 83 size_t pointlen = strlen (point); 84 putc ('0', stream); 85 fwrite (point, 1, pointlen, stream); 86 written += pointlen + 1; 87 } 88 89 /* Write mantissa */ 90 { 91 size_t fwret; 92 fwret = fwrite (str, 1, n_digits, stream); 93 written += fwret; 94 } 95 96 /* Write exponent */ 97 { 98 int fpret; 99 fpret = fprintf (stream, (base <= 10 ? "e%ld" : "@%ld"), exp); 100 written += fpret; 101 } 102 103 TMP_FREE; 104 return ferror (stream) ? 0 : written; 105 } 106