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1 : // String Conversions -*- C++ -*-
2 :
3 : // Copyright (C) 2008-2016 Free Software Foundation, Inc.
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
8 : // Free Software Foundation; either version 3, or (at your option)
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 :
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/>.
24 :
25 : /** @file ext/string_conversions.h
26 : * This file is a GNU extension to the Standard C++ Library.
27 : */
28 :
29 : #ifndef _STRING_CONVERSIONS_H
30 : #define _STRING_CONVERSIONS_H 1
31 :
32 : #pragma GCC system_header
33 :
34 : #if __cplusplus < 201103L
35 : # include <bits/c++0x_warning.h>
36 : #else
37 :
38 : #include <bits/c++config.h>
39 : #include <ext/numeric_traits.h>
40 : #include <bits/functexcept.h>
41 : #include <cstdlib>
42 : #include <cwchar>
43 : #include <cstdio>
44 : #include <cerrno>
45 :
46 : namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
47 : {
48 : _GLIBCXX_BEGIN_NAMESPACE_VERSION
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;
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 :
68 : const _TRet __tmp = __convf(__str, &__endptr, __base...);
69 :
70 : if (__endptr == __str)
71 : std::__throw_invalid_argument(__name);
72 : else if (errno == ERANGE
73 : || (std::__are_same<_Ret, int>::__value
74 : && (__tmp < __numeric_traits<int>::__min
75 : || __tmp > __numeric_traits<int>::__max)))
76 : std::__throw_out_of_range(__name);
77 : else
78 : __ret = __tmp;
79 :
80 : if (__idx)
81 : *__idx = __endptr - __str;
82 :
83 : return __ret;
84 : }
85 :
86 : // Helper for the to_string / to_wstring functions.
87 : template<typename _String, typename _CharT = typename _String::value_type>
88 : _String
89 88 : __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*,
90 : __builtin_va_list), std::size_t __n,
91 : const _CharT* __fmt, ...)
92 : {
93 : // XXX Eventually the result will be constructed in place in
94 : // the C++0x string, likely with the help of internal hooks.
95 : _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
96 88 : * __n));
97 :
98 : __builtin_va_list __args;
99 88 : __builtin_va_start(__args, __fmt);
100 :
101 88 : const int __len = __convf(__s, __n, __fmt, __args);
102 :
103 88 : __builtin_va_end(__args);
104 :
105 88 : return _String(__s, __s + __len);
106 : }
107 :
108 : _GLIBCXX_END_NAMESPACE_VERSION
109 : } // namespace
110 :
111 : #endif // C++11
112 :
113 : #endif // _STRING_CONVERSIONS_H
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