Line data Source code
1 : // String Conversions -*- C++ -*-
2 :
3 : // Copyright (C) 2008-2017 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 : 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 :
80 : const _TRet __tmp = __convf(__str, &__endptr, __base...);
81 :
82 : if (__endptr == __str)
83 : std::__throw_invalid_argument(__name);
84 : else if (errno == ERANGE
85 : || _Range_chk::_S_chk(__tmp, std::is_same<_Ret, int>{}))
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 0 : __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*,
100 : __builtin_va_list), std::size_t __n,
101 : const _CharT* __fmt, ...)
102 : {
103 : // XXX Eventually the result should be constructed in-place in
104 : // the __cxx11 string, likely with the help of internal hooks.
105 0 : _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
106 : * __n));
107 :
108 : __builtin_va_list __args;
109 0 : __builtin_va_start(__args, __fmt);
110 :
111 0 : const int __len = __convf(__s, __n, __fmt, __args);
112 :
113 0 : __builtin_va_end(__args);
114 :
115 0 : return _String(__s, __s + __len);
116 : }
117 :
118 : _GLIBCXX_END_NAMESPACE_VERSION
119 : } // namespace
120 :
121 : #endif // C++11
122 :
123 : #endif // _STRING_CONVERSIONS_H
|