1// String Conversions -*- C++ -*- 2 3// Copyright (C) 2008, 2009 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#ifndef _STRING_CONVERSIONS_H 26#define _STRING_CONVERSIONS_H 1 27 28#pragma GCC system_header 29 30#include <ext/numeric_traits.h> 31#include <bits/functexcept.h> 32#include <cstddef> 33#include <cstdlib> 34#include <cwchar> 35#include <cstdio> 36#include <cerrno> 37 38_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 39 40 // Helper for all the sto* functions. 41 template<typename _TRet, typename _Ret = _TRet, typename _CharT, 42 typename... _Base> 43 _Ret 44 __stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...), 45 const char* __name, const _CharT* __str, std::size_t* __idx, 46 _Base... __base) 47 { 48 _Ret __ret; 49 50 _CharT* __endptr; 51 errno = 0; 52 const _TRet __tmp = __convf(__str, &__endptr, __base...); 53 54 if (__endptr == __str) 55 std::__throw_invalid_argument(__name); 56 else if (errno == ERANGE 57 || (std::__are_same<_Ret, int>::__value 58 && (__tmp < __numeric_traits<int>::__min 59 || __tmp > __numeric_traits<int>::__max))) 60 std::__throw_out_of_range(__name); 61 else 62 __ret = __tmp; 63 64 if (__idx) 65 *__idx = __endptr - __str; 66 67 return __ret; 68 } 69 70 // Helper for the to_string / to_wstring functions. 71 template<typename _String, typename _CharT = typename _String::value_type> 72 _String 73 __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*, 74 __builtin_va_list), std::size_t __n, 75 const _CharT* __fmt, ...) 76 { 77 // XXX Eventually the result will be constructed in place in 78 // the C++0x string, likely with the help of internal hooks. 79 _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) 80 * __n)); 81 82 __builtin_va_list __args; 83 __builtin_va_start(__args, __fmt); 84 85 const int __len = __convf(__s, __n, __fmt, __args); 86 87 __builtin_va_end(__args); 88 89 return _String(__s, __s + __len); 90 } 91 92_GLIBCXX_END_NAMESPACE 93 94#endif // _STRING_CONVERSIONS_H 95