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       1             : // String Conversions -*- C++ -*-
       2             : 
       3             : // Copyright (C) 2008-2019 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           0 :     __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           0 :       _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
     106             :                                                           * __n));
     107             : 
     108             :       __builtin_va_list __args;
     109           0 :       __builtin_va_start(__args, __fmt);
     110             : 
     111           0 :       const int __len = __convf(__s, __n, __fmt, __args);
     112             : 
     113           0 :       __builtin_va_end(__args);
     114             : 
     115           0 :       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