| // String Conversions -*- C++ -*- |
| |
| // Copyright (C) 2008-2020 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| /** @file ext/string_conversions.h |
| * This file is a GNU extension to the Standard C++ Library. |
| */ |
| |
| #ifndef _STRING_CONVERSIONS_H |
| #define _STRING_CONVERSIONS_H 1 |
| |
| #pragma GCC system_header |
| |
| #if __cplusplus < 201103L |
| # include <bits/c++0x_warning.h> |
| #else |
| |
| #include <bits/c++config.h> |
| #include <ext/numeric_traits.h> |
| #include <bits/functexcept.h> |
| #include <cstdlib> |
| #include <cwchar> |
| #include <cstdio> |
| #include <cerrno> |
| |
| namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
| { |
| _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| |
| // Helper for all the sto* functions. |
| template<typename _TRet, typename _Ret = _TRet, typename _CharT, |
| typename... _Base> |
| _Ret |
| __stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...), |
| const char* __name, const _CharT* __str, std::size_t* __idx, |
| _Base... __base) |
| { |
| _Ret __ret; |
| |
| _CharT* __endptr; |
| |
| struct _Save_errno { |
| _Save_errno() : _M_errno(errno) { errno = 0; } |
| ~_Save_errno() { if (errno == 0) errno = _M_errno; } |
| int _M_errno; |
| } const __save_errno; |
| |
| struct _Range_chk { |
| static bool |
| _S_chk(_TRet, std::false_type) { return false; } |
| |
| static bool |
| _S_chk(_TRet __val, std::true_type) // only called when _Ret is int |
| { |
| return __val < _TRet(__numeric_traits<int>::__min) |
| || __val > _TRet(__numeric_traits<int>::__max); |
| } |
| }; |
| |
| const _TRet __tmp = __convf(__str, &__endptr, __base...); |
| |
| if (__endptr == __str) |
| std::__throw_invalid_argument(__name); |
| else if (errno == ERANGE |
| || _Range_chk::_S_chk(__tmp, std::is_same<_Ret, int>{})) |
| std::__throw_out_of_range(__name); |
| else |
| __ret = __tmp; |
| |
| if (__idx) |
| *__idx = __endptr - __str; |
| |
| return __ret; |
| } |
| |
| // Helper for the to_string / to_wstring functions. |
| template<typename _String, typename _CharT = typename _String::value_type> |
| _String |
| __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*, |
| __builtin_va_list), std::size_t __n, |
| const _CharT* __fmt, ...) |
| { |
| // XXX Eventually the result should be constructed in-place in |
| // the __cxx11 string, likely with the help of internal hooks. |
| _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) |
| * __n)); |
| |
| __builtin_va_list __args; |
| __builtin_va_start(__args, __fmt); |
| |
| const int __len = __convf(__s, __n, __fmt, __args); |
| |
| __builtin_va_end(__args); |
| |
| return _String(__s, __s + __len); |
| } |
| |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace |
| |
| #endif // C++11 |
| |
| #endif // _STRING_CONVERSIONS_H |