inp_str.c
上传用户:qaz666999
上传日期:2022-08-06
资源大小:2570k
文件大小:2k
- /* 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 1996, 2000, 2001, 2002, 2005 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP 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 MP 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 MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include <ctype.h>
- #include "gmp.h"
- #include "gmp-impl.h"
- size_t
- mpf_inp_str (mpf_ptr rop, FILE *stream, int base)
- {
- char *str;
- size_t alloc_size, str_size;
- int c;
- int res;
- size_t nread;
- if (stream == 0)
- stream = stdin;
- alloc_size = 100;
- str = (char *) (*__gmp_allocate_func) (alloc_size);
- str_size = 0;
- nread = 0;
- /* Skip whitespace. */
- do
- {
- c = getc (stream);
- nread++;
- }
- while (isspace (c));
- for (;;)
- {
- if (str_size >= alloc_size)
- {
- size_t old_alloc_size = alloc_size;
- alloc_size = alloc_size * 3 / 2;
- str = (char *) (*__gmp_reallocate_func) (str, old_alloc_size, alloc_size);
- }
- if (c == EOF || isspace (c))
- break;
- str[str_size++] = c;
- c = getc (stream);
- }
- ungetc (c, stream);
- nread--;
- if (str_size >= alloc_size)
- {
- size_t old_alloc_size = alloc_size;
- alloc_size = alloc_size * 3 / 2;
- str = (char *) (*__gmp_reallocate_func) (str, old_alloc_size, alloc_size);
- }
- str[str_size] = 0;
- res = mpf_set_str (rop, str, base);
- (*__gmp_free_func) (str, alloc_size);
- if (res == -1)
- return 0; /* error */
- return str_size + nread;
- }