1/* __gmpz_operator_in_nowhite -- C++-style input of mpz_t, no whitespace skip.
2
3Copyright 2001, 2003 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 either:
9
10  * the GNU Lesser General Public License as published by the Free
11    Software Foundation; either version 3 of the License, or (at your
12    option) any later version.
13
14or
15
16  * the GNU General Public License as published by the Free Software
17    Foundation; either version 2 of the License, or (at your option) any
18    later version.
19
20or both in parallel, as here.
21
22The GNU MP Library is distributed in the hope that it will be useful, but
23WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
24or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
25for more details.
26
27You should have received copies of the GNU General Public License and the
28GNU Lesser General Public License along with the GNU MP Library.  If not,
29see https://www.gnu.org/licenses/.  */
30
31#include <cctype>
32#include <iostream>
33#include <string>
34#include "gmp-impl.h"
35
36using namespace std;
37
38
39// For g++ libstdc++ parsing see num_get<chartype,initer>::_M_extract_int in
40// include/bits/locale_facets.tcc.
41
42istream &
43__gmpz_operator_in_nowhite (istream &i, mpz_ptr z, char c)
44{
45  int base;
46  string s;
47  bool ok = false, zero, showbase;
48
49  if (c == '-' || c == '+') // sign
50    {
51      if (c == '-') // mpz_set_str doesn't accept '+'
52	s = "-";
53      i.get(c);
54    }
55
56  base = __gmp_istream_set_base(i, c, zero, showbase); // select the base
57  __gmp_istream_set_digits(s, i, c, ok, base);         // read the number
58
59  if (i.good()) // last character read was non-numeric
60    i.putback(c);
61  else if (i.eof() && (ok || zero)) // stopped just before eof
62    i.clear(ios::eofbit);
63
64  if (ok)
65    ASSERT_NOCARRY (mpz_set_str (z, s.c_str(), base)); // extract the number
66  else if (zero)
67    mpz_set_ui(z, 0);
68  else
69    i.setstate(ios::failbit); // read failed
70
71  return i;
72}
73