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a945c346 | 1 | // Copyright (C) 2020-2024 Free Software Foundation, Inc. |
eb0ff770 JW |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
18 | // { dg-do run { target c++14 } } | |
19 | ||
20 | #include <charconv> | |
21 | #include <string> | |
22 | #include <testsuite_hooks.h> | |
23 | ||
24 | #ifdef DEBUG | |
25 | #include <stdio.h> | |
26 | #endif | |
27 | ||
28 | long long | |
29 | read(const char* first, const char* last, int base) | |
30 | { | |
31 | long long val = 0; | |
6fb8b670 | 32 | unsigned long long place = 1; |
eb0ff770 JW |
33 | while (last > first) |
34 | { | |
35 | val += (*--last - '0') * place; | |
36 | place *= base; | |
37 | } | |
38 | return val; | |
39 | } | |
40 | ||
41 | void | |
42 | test01() | |
43 | { | |
44 | std::from_chars_result res; | |
45 | long long val; | |
46 | for (auto s : { "10001", "10010", "10011", "10101", "10110", "10111", | |
47 | "11001", "11010", "11011", "11101", "11110", "11111" }) | |
48 | { | |
49 | std::string ss[2] = { s, std::string(64, '0') + s }; | |
50 | for (const auto& str : ss) | |
51 | { | |
52 | const char* first = str.data(); | |
53 | for (int base = 2; base < 37; ++base) | |
54 | { | |
55 | const char* last = str.data() + str.length(); | |
56 | for (size_t n = 0; n < ss[0].length(); ++n) | |
57 | { | |
58 | #ifdef DEBUG | |
59 | printf("Parsing \"%.*s\" in base %d\n", int(last - first), first, | |
60 | base); | |
61 | #endif | |
62 | res = std::from_chars(first, last, val, base); | |
63 | VERIFY( res.ptr == last ); | |
64 | VERIFY( res.ec == std::errc{} ); | |
65 | VERIFY( val == read(first, last, base) ); | |
66 | // Test again with shorter string to check from_chars doesn't read | |
67 | // the digits past the last pointer. | |
68 | --last; | |
69 | } | |
70 | } | |
71 | } | |
72 | } | |
73 | } | |
74 | ||
75 | int | |
76 | main() | |
77 | { | |
78 | test01(); | |
79 | } |