85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/* mpf_inp_str(dest_float, stream, base) -- Input a number in base
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BASE from stdio stream STREAM and store the result in DEST_FLOAT.
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Copyright 1996, 2000, 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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#include <stdio.h>
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#include <ctype.h>
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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_inp_str (mpf_ptr rop, FILE *stream, int base)
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{
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char *str;
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size_t alloc_size, str_size;
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int c;
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int res;
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size_t nread;
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if (stream == 0)
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stream = stdin;
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alloc_size = 100;
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str = (char *) (*__gmp_allocate_func) (alloc_size);
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str_size = 0;
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nread = 0;
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/* Skip whitespace. */
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do
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{
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c = getc (stream);
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nread++;
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}
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while (isspace (c));
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for (;;)
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{
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if (str_size >= alloc_size)
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{
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size_t old_alloc_size = alloc_size;
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alloc_size = alloc_size * 3 / 2;
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str = (char *) (*__gmp_reallocate_func) (str, old_alloc_size, alloc_size);
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}
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if (c == EOF || isspace (c))
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break;
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str[str_size++] = c;
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c = getc (stream);
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}
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ungetc (c, stream);
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nread--;
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if (str_size >= alloc_size)
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{
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size_t old_alloc_size = alloc_size;
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alloc_size = alloc_size * 3 / 2;
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str = (char *) (*__gmp_reallocate_func) (str, old_alloc_size, alloc_size);
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}
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str[str_size] = 0;
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res = mpf_set_str (rop, str, base);
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(*__gmp_free_func) (str, alloc_size);
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if (res == -1)
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return 0; /* error */
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return str_size + nread;
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}
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