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1 | // String Conversions -*- C++ -*- |
2 | ||
a5544970 | 3 | // Copyright (C) 2008-2019 Free Software Foundation, Inc. |
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4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
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9 | // any later version. |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
748086b7 JJ |
16 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License and | |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
a5a6b586 | 24 | |
f910786b BK |
25 | /** @file ext/string_conversions.h |
26 | * This file is a GNU extension to the Standard C++ Library. | |
27 | */ | |
28 | ||
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29 | #ifndef _STRING_CONVERSIONS_H |
30 | #define _STRING_CONVERSIONS_H 1 | |
31 | ||
32 | #pragma GCC system_header | |
33 | ||
3c523cf8 JW |
34 | #if __cplusplus < 201103L |
35 | # include <bits/c++0x_warning.h> | |
36 | #else | |
37 | ||
8fc81078 | 38 | #include <bits/c++config.h> |
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39 | #include <ext/numeric_traits.h> |
40 | #include <bits/functexcept.h> | |
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41 | #include <cstdlib> |
42 | #include <cwchar> | |
43 | #include <cstdio> | |
44 | #include <cerrno> | |
45 | ||
12ffa228 BK |
46 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
47 | { | |
48 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
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49 | |
50 | // Helper for all the sto* functions. | |
51 | template<typename _TRet, typename _Ret = _TRet, typename _CharT, | |
52 | typename... _Base> | |
53 | _Ret | |
54 | __stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...), | |
55 | const char* __name, const _CharT* __str, std::size_t* __idx, | |
56 | _Base... __base) | |
57 | { | |
58 | _Ret __ret; | |
59 | ||
60 | _CharT* __endptr; | |
f14decaf JW |
61 | |
62 | struct _Save_errno { | |
63 | _Save_errno() : _M_errno(errno) { errno = 0; } | |
64 | ~_Save_errno() { if (errno == 0) errno = _M_errno; } | |
65 | int _M_errno; | |
66 | } const __save_errno; | |
67 | ||
8dc1e574 JW |
68 | struct _Range_chk { |
69 | static bool | |
70 | _S_chk(_TRet, std::false_type) { return false; } | |
71 | ||
72 | static bool | |
73 | _S_chk(_TRet __val, std::true_type) // only called when _Ret is int | |
74 | { | |
75 | return __val < _TRet(__numeric_traits<int>::__min) | |
76 | || __val > _TRet(__numeric_traits<int>::__max); | |
77 | } | |
78 | }; | |
79 | ||
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80 | const _TRet __tmp = __convf(__str, &__endptr, __base...); |
81 | ||
82 | if (__endptr == __str) | |
83 | std::__throw_invalid_argument(__name); | |
84 | else if (errno == ERANGE | |
8dc1e574 | 85 | || _Range_chk::_S_chk(__tmp, std::is_same<_Ret, int>{})) |
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86 | std::__throw_out_of_range(__name); |
87 | else | |
88 | __ret = __tmp; | |
89 | ||
90 | if (__idx) | |
91 | *__idx = __endptr - __str; | |
92 | ||
93 | return __ret; | |
94 | } | |
95 | ||
96 | // Helper for the to_string / to_wstring functions. | |
97 | template<typename _String, typename _CharT = typename _String::value_type> | |
98 | _String | |
99 | __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*, | |
100 | __builtin_va_list), std::size_t __n, | |
101 | const _CharT* __fmt, ...) | |
102 | { | |
4f5f9962 JW |
103 | // XXX Eventually the result should be constructed in-place in |
104 | // the __cxx11 string, likely with the help of internal hooks. | |
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105 | _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) |
106 | * __n)); | |
107 | ||
108 | __builtin_va_list __args; | |
109 | __builtin_va_start(__args, __fmt); | |
110 | ||
111 | const int __len = __convf(__s, __n, __fmt, __args); | |
112 | ||
113 | __builtin_va_end(__args); | |
114 | ||
115 | return _String(__s, __s + __len); | |
116 | } | |
117 | ||
12ffa228 BK |
118 | _GLIBCXX_END_NAMESPACE_VERSION |
119 | } // namespace | |
a5a6b586 | 120 | |
3c523cf8 JW |
121 | #endif // C++11 |
122 | ||
a5a6b586 | 123 | #endif // _STRING_CONVERSIONS_H |