1    	// String Conversions -*- C++ -*-
2    	
3    	// Copyright (C) 2008-2017 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   	/** @file ext/string_conversions.h
26   	 *  This file is a GNU extension to the Standard C++ Library.
27   	 */
28   	
29   	#ifndef _STRING_CONVERSIONS_H
30   	#define _STRING_CONVERSIONS_H 1
31   	
32   	#pragma GCC system_header
33   	
34   	#if __cplusplus < 201103L
35   	# include <bits/c++0x_warning.h>
36   	#else
37   	
38   	#include <bits/c++config.h>
39   	#include <ext/numeric_traits.h>
40   	#include <bits/functexcept.h>
41   	#include <cstdlib>
42   	#include <cwchar>
43   	#include <cstdio>
44   	#include <cerrno>
45   	
46   	namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
47   	{
48   	_GLIBCXX_BEGIN_NAMESPACE_VERSION
49   	
50   	  // Helper for all the sto* functions.
51   	  template<typename _TRet, typename _Ret = _TRet, typename _CharT,
52   		   typename... _Base>
53   	    _Ret
54   	    __stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...),
55   		   const char* __name, const _CharT* __str, std::size_t* __idx,
56   		   _Base... __base)
57   	    {
58   	      _Ret __ret;
59   	
60   	      _CharT* __endptr;
61   	
62   	      struct _Save_errno {
63   		_Save_errno() : _M_errno(errno) { errno = 0; }
64   		~_Save_errno() { if (errno == 0) errno = _M_errno; }
65   		int _M_errno;
66   	      } const __save_errno;
67   	
68   	      struct _Range_chk {
69   		  static bool
70   		  _S_chk(_TRet, std::false_type) { return false; }
71   	
72   		  static bool
73   		  _S_chk(_TRet __val, std::true_type) // only called when _Ret is int
74   		  {
75   		    return __val < _TRet(__numeric_traits<int>::__min)
76   		      || __val > _TRet(__numeric_traits<int>::__max);
77   		  }
78   	      };
79   	
80   	      const _TRet __tmp = __convf(__str, &__endptr, __base...);
81   	
82   	      if (__endptr == __str)
83   		std::__throw_invalid_argument(__name);
84   	      else if (errno == ERANGE
85   		  || _Range_chk::_S_chk(__tmp, std::is_same<_Ret, int>{}))
86   		std::__throw_out_of_range(__name);
87   	      else
88   		__ret = __tmp;
89   	
90   	      if (__idx)
91   		*__idx = __endptr - __str;
92   	
93   	      return __ret;
94   	    }
95   	
96   	  // Helper for the to_string / to_wstring functions.
97   	  template<typename _String, typename _CharT = typename _String::value_type>
98   	    _String
99   	    __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*,
100  					 __builtin_va_list), std::size_t __n,
101  			 const _CharT* __fmt, ...)
102  	    {
103  	      // XXX Eventually the result should be constructed in-place in
104  	      // the __cxx11 string, likely with the help of internal hooks.
105  	      _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
106  								  * __n));
107  	
108  	      __builtin_va_list __args;
109  	      __builtin_va_start(__args, __fmt);
110  	
111  	      const int __len = __convf(__s, __n, __fmt, __args);
112  	
113  	      __builtin_va_end(__args);
114  	
115  	      return _String(__s, __s + __len);
116  	    }
117  	
118  	_GLIBCXX_END_NAMESPACE_VERSION
119  	} // namespace
120  	
121  	#endif // C++11
122  	
123  	#endif // _STRING_CONVERSIONS_H
124