124 lines
3.5 KiB
C++
124 lines
3.5 KiB
C++
// String Conversions -*- C++ -*-
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// Copyright (C) 2008-2018 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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// 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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// 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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// 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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/** @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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#ifndef _STRING_CONVERSIONS_H
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#define _STRING_CONVERSIONS_H 1
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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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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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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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_CharT* __endptr;
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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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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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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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const _TRet __tmp = __convf(__str, &__endptr, __base...);
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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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if (__idx)
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*__idx = __endptr - __str;
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return __ret;
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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
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