1 // String Conversions -*- C++ -*- 2 3 // Copyright (C) 2008-2018 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 __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