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// String Conversions -*- C++ -*-
// Copyright (C) 2008-2021 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
// 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
// <>.
/** @file ext/string_conversions.h
* This file is a GNU extension to the Standard C++ Library.
#pragma GCC system_header
#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#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)
// Helper for all the sto* functions.
template<typename _TRet, typename _Ret = _TRet, typename _CharT,
typename... _Base>
__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)
else if (errno == ERANGE
|| _Range_chk::_S_chk(__tmp, std::is_same<_Ret, int>{}))
__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>
__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);
return _String(__s, __s + __len);
} // namespace
#endif // C++11