1/* mpq_inp_str -- read an mpq from a FILE.
2
3Copyright 2001 Free Software Foundation, Inc.
4
5This file is part of the GNU MP Library.
6
7The GNU MP Library is free software; you can redistribute it and/or modify
8it under the terms of the GNU Lesser General Public License as published by
9the Free Software Foundation; either version 3 of the License, or (at your
10option) any later version.
11
12The GNU MP Library is distributed in the hope that it will be useful, but
13WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
15License for more details.
16
17You should have received a copy of the GNU Lesser General Public License
18along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
19
20#include <stdio.h>
21#include <ctype.h>
22#include "gmp.h"
23#include "gmp-impl.h"
24
25
26size_t
27mpq_inp_str (mpq_ptr q, FILE *fp, int base)
28{
29  size_t  nread;
30  int     c;
31
32  if (fp == NULL)
33    fp = stdin;
34
35  q->_mp_den._mp_size = 1;
36  q->_mp_den._mp_d[0] = 1;
37
38  nread = mpz_inp_str (mpq_numref(q), fp, base);
39  if (nread == 0)
40    return 0;
41
42  c = getc (fp);
43  nread++;
44
45  if (c == '/')
46    {
47      c = getc (fp);
48      nread++;
49
50      nread = mpz_inp_str_nowhite (mpq_denref(q), fp, base, c, nread);
51      if (nread == 0)
52        {
53          q->_mp_num._mp_size = 0;
54          q->_mp_den._mp_size = 1;
55          q->_mp_den._mp_d[0] = 1;
56        }
57    }
58  else
59    {
60      ungetc (c, fp);
61      nread--;
62    }
63
64  return nread;
65}
66