1 // String Conversions -*- C++ -*- 2 3 // Copyright (C) 2008-2013 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 errno = 0; 62 const _TRet __tmp = __convf(__str, &__endptr, __base...); 63 64 if (__endptr == __str) 65 std::__throw_invalid_argument(__name); 66 else if (errno == ERANGE 67 || (std::__are_same<_Ret, int>::__value 68 && (__tmp < __numeric_traits<int>::__min 69 || __tmp > __numeric_traits<int>::__max))) 70 std::__throw_out_of_range(__name); 71 else 72 __ret = __tmp; 73 74 if (__idx) 75 *__idx = __endptr - __str; 76 77 return __ret; 78 } 79 80 // Helper for the to_string / to_wstring functions. 81 template<typename _String, typename _CharT = typename _String::value_type> 82 _String 83 __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*, 84 __builtin_va_list), std::size_t __n, 85 const _CharT* __fmt, ...) 86 { 87 // XXX Eventually the result will be constructed in place in 88 // the C++0x string, likely with the help of internal hooks. 89 _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) 90 * __n)); 91 92 __builtin_va_list __args; 93 __builtin_va_start(__args, __fmt); 94 95 const int __len = __convf(__s, __n, __fmt, __args); 96 97 __builtin_va_end(__args); 98 99 return _String(__s, __s + __len); 100 } 101 102 _GLIBCXX_END_NAMESPACE_VERSION 103 } // namespace 104 105 #endif // C++11 106 107 #endif // _STRING_CONVERSIONS_H 108
