1 /* __gmpz_operator_in_nowhite -- C++-style input of mpz_t, no whitespace skip.
2
3 Copyright 2001, 2003 Free Software Foundation, Inc.
4
5 This file is part of the GNU MP Library.
6
7 The GNU MP Library is free software; you can redistribute it and/or modify
8 it 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
14 or
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
20 or both in parallel, as here.
21
22 The GNU MP Library is distributed in the hope that it will be useful, but
23 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
24 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
25 for more details.
26
27 You should have received copies of the GNU General Public License and the
28 GNU Lesser General Public License along with the GNU MP Library. If not,
29 see https://www.gnu.org/licenses/. */
30
31 #include <cctype>
32 #include <iostream>
33 #include <string>
34 #include "gmp-impl.h"
35
36 using 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
42 istream &
__gmpz_operator_in_nowhite(istream & i,mpz_ptr z,char c)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