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// String Conversions -*- C++ -*- |
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// Copyright (C) 2008-2021 Free Software Foundation, Inc. |
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// |
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// This file is part of the GNU ISO C++ Library. This library is free |
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// software; you can redistribute it and/or modify it under the |
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// terms of the GNU General Public License as published by the |
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// Free Software Foundation; either version 3, or (at your option) |
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// any later version. |
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|
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// This library is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU General Public License for more details. |
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|
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// Under Section 7 of GPL version 3, you are granted additional |
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// permissions described in the GCC Runtime Library Exception, version |
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// 3.1, as published by the Free Software Foundation. |
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|
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// You should have received a copy of the GNU General Public License and |
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// a copy of the GCC Runtime Library Exception along with this program; |
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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// <http://www.gnu.org/licenses/>. |
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|
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/** @file ext/string_conversions.h |
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* This file is a GNU extension to the Standard C++ Library. |
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*/ |
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|
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#ifndef _STRING_CONVERSIONS_H |
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#define _STRING_CONVERSIONS_H 1 |
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|
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#pragma GCC system_header |
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#if __cplusplus < 201103L |
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# include <bits/c++0x_warning.h> |
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#else |
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#include <bits/c++config.h> |
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#include <ext/numeric_traits.h> |
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#include <bits/functexcept.h> |
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#include <cstdlib> |
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#include <cwchar> |
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#include <cstdio> |
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#include <cerrno> |
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|
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
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{ |
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_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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|
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// Helper for all the sto* functions. |
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template<typename _TRet, typename _Ret = _TRet, typename _CharT, |
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typename... _Base> |
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_Ret |
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__stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...), |
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const char* __name, const _CharT* __str, std::size_t* __idx, |
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_Base... __base) |
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{ |
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_Ret __ret; |
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|
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_CharT* __endptr; |
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|
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struct _Save_errno { |
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_Save_errno() : _M_errno(errno) { errno = 0; } |
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~_Save_errno() { if (errno == 0) errno = _M_errno; } |
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int _M_errno; |
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} const __save_errno; |
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|
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struct _Range_chk { |
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static bool |
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_S_chk(_TRet, std::false_type) { return false; } |
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|
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static bool |
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_S_chk(_TRet __val, std::true_type) // only called when _Ret is int |
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{ |
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return __val < _TRet(__numeric_traits<int>::__min) |
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|| __val > _TRet(__numeric_traits<int>::__max); |
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} |
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}; |
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|
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const _TRet __tmp = __convf(__str, &__endptr, __base...); |
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|
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if (__endptr == __str) |
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std::__throw_invalid_argument(__name); |
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else if (errno == ERANGE |
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|| _Range_chk::_S_chk(__tmp, std::is_same<_Ret, int>{})) |
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std::__throw_out_of_range(__name); |
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else |
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__ret = __tmp; |
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|
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if (__idx) |
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*__idx = __endptr - __str; |
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|
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return __ret; |
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} |
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|
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// Helper for the to_string / to_wstring functions. |
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template<typename _String, typename _CharT = typename _String::value_type> |
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_String |
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__to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*, |
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__builtin_va_list), std::size_t __n, |
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const _CharT* __fmt, ...) |
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{ |
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// XXX Eventually the result should be constructed in-place in |
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// the __cxx11 string, likely with the help of internal hooks. |
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_CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) |
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* __n)); |
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__builtin_va_list __args; |
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__builtin_va_start(__args, __fmt); |
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const int __len = __convf(__s, __n, __fmt, __args); |
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__builtin_va_end(__args); |
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return _String(__s, __s + __len); |
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} |
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_GLIBCXX_END_NAMESPACE_VERSION |
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} // namespace |
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#endif // C++11 |
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#endif // _STRING_CONVERSIONS_H |
