1 // String Conversions -*- C++ -*-
3 // Copyright (C) 2008-2022 Free Software Foundation, Inc.
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)
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.
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.
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/>.
25 /** @file ext/string_conversions.h
26 * This file is a GNU extension to the Standard C++ Library.
29 #ifndef _STRING_CONVERSIONS_H
30 #define _STRING_CONVERSIONS_H 1
32 #pragma GCC system_header
34 #include <bits/requires_hosted.h> // GNU extensions are currently omitted
36 #if __cplusplus < 201103L
37 # include <bits/c++0x_warning.h>
40 #include <bits/c++config.h>
41 #include <ext/numeric_traits.h>
42 #include <bits/functexcept.h>
48 namespace __gnu_cxx
_GLIBCXX_VISIBILITY(default)
50 _GLIBCXX_BEGIN_NAMESPACE_VERSION
52 // Helper for all the sto* functions.
53 template<typename _TRet
, typename _Ret
= _TRet
, typename _CharT
,
56 __stoa(_TRet (*__convf
) (const _CharT
*, _CharT
**, _Base
...),
57 const char* __name
, const _CharT
* __str
, std::size_t* __idx
,
65 _Save_errno() : _M_errno(errno
) { errno
= 0; }
66 ~_Save_errno() { if (errno
== 0) errno
= _M_errno
; }
72 _S_chk(_TRet
, std::false_type
) { return false; }
75 _S_chk(_TRet __val
, std::true_type
) // only called when _Ret is int
77 return __val
< _TRet(__numeric_traits
<int>::__min
)
78 || __val
> _TRet(__numeric_traits
<int>::__max
);
82 const _TRet __tmp
= __convf(__str
, &__endptr
, __base
...);
84 if (__endptr
== __str
)
85 std::__throw_invalid_argument(__name
);
86 else if (errno
== ERANGE
87 || _Range_chk::_S_chk(__tmp
, std::is_same
<_Ret
, int>{}))
88 std::__throw_out_of_range(__name
);
93 *__idx
= __endptr
- __str
;
98 // Helper for the to_string / to_wstring functions.
99 template<typename _String
, typename _CharT
= typename
_String::value_type
>
101 __to_xstring(int (*__convf
) (_CharT
*, std::size_t, const _CharT
*,
102 __builtin_va_list
), std::size_t __n
,
103 const _CharT
* __fmt
, ...)
105 // XXX Eventually the result should be constructed in-place in
106 // the __cxx11 string, likely with the help of internal hooks.
107 _CharT
* __s
= static_cast<_CharT
*>(__builtin_alloca(sizeof(_CharT
)
110 __builtin_va_list __args
;
111 __builtin_va_start(__args
, __fmt
);
113 const int __len
= __convf(__s
, __n
, __fmt
, __args
);
115 __builtin_va_end(__args
);
117 return _String(__s
, __s
+ __len
);
120 _GLIBCXX_END_NAMESPACE_VERSION
125 #endif // _STRING_CONVERSIONS_H