1// String Conversions -*- C++ -*- 
2 
3// Copyright (C) 2008-2019 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 
46namespace __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 __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 _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 
118_GLIBCXX_END_NAMESPACE_VERSION 
119} // namespace 
120 
121#endif // C++11 
122 
123#endif // _STRING_CONVERSIONS_H 
124