| /* mpf_inp_str(dest_float, stream, base) -- Input a number in base |
| BASE from stdio stream STREAM and store the result in DEST_FLOAT. |
| |
| Copyright 1999, 2001, 2002, 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
| Contributed by the Arenaire and Cacao projects, INRIA. |
| (Copied from GMP, file mpf/inp_str.c) |
| |
| 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 <ctype.h> |
| |
| #include "mpfr-impl.h" |
| |
| size_t |
| mpfr_inp_str (mpfr_ptr rop, FILE *stream, int base, mp_rnd_t rnd_mode) |
| { |
| unsigned char *str; |
| size_t alloc_size, str_size; |
| int c; |
| int retval; |
| size_t nread; |
| |
| MPFR_CLEAR_FLAGS(rop); |
| if (stream == NULL) |
| stream = stdin; |
| |
| alloc_size = 100; |
| str = (unsigned char *) (*__gmp_allocate_func) (alloc_size); |
| str_size = 0; |
| nread = 0; |
| |
| /* Skip whitespace. */ |
| do |
| { |
| c = getc (stream); |
| nread++; |
| } |
| while (isspace (c)); |
| |
| /* number of characters read is nread */ |
| |
| for (;;) |
| { |
| if (str_size >= alloc_size) |
| { |
| size_t old_alloc_size = alloc_size; |
| alloc_size = alloc_size * 3 / 2; |
| str = (unsigned char *) |
| (*__gmp_reallocate_func) (str, old_alloc_size, alloc_size); |
| } |
| if (c == EOF || isspace (c)) |
| break; |
| str[str_size++] = (unsigned char) c; |
| c = getc (stream); |
| } |
| ungetc (c, stream); |
| |
| /* number of characters read is nread + str_size - 1 */ |
| |
| /* we can exit the for loop only by the break instruction, |
| then necessarily str_size >= alloc_size was checked, so |
| now str_size < alloc_size */ |
| |
| str[str_size] = '\0'; |
| |
| retval = mpfr_set_str (rop, (char *) str, base, rnd_mode); |
| (*__gmp_free_func) (str, alloc_size); |
| |
| if (retval == -1) |
| return 0; /* error */ |
| |
| return str_size + nread - 1; |
| } |