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      1 // String Conversions -*- C++ -*-
      2 
      3 // Copyright (C) 2008, 2009, 2010 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 #include <bits/c++config.h>
     35 #include <ext/numeric_traits.h>
     36 #include <bits/functexcept.h>
     37 #include <cstdlib>
     38 #include <cwchar>
     39 #include <cstdio>
     40 #include <cerrno>
     41 
     42 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
     43 {
     44 _GLIBCXX_BEGIN_NAMESPACE_VERSION
     45 
     46   // Helper for all the sto* functions.
     47   template<typename _TRet, typename _Ret = _TRet, typename _CharT,
     48 	   typename... _Base>
     49     _Ret
     50     __stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...),
     51 	   const char* __name, const _CharT* __str, std::size_t* __idx,
     52 	   _Base... __base)
     53     {
     54       _Ret __ret;
     55 
     56       _CharT* __endptr;
     57       errno = 0;
     58       const _TRet __tmp = __convf(__str, &__endptr, __base...);
     59 
     60       if (__endptr == __str)
     61 	std::__throw_invalid_argument(__name);
     62       else if (errno == ERANGE
     63 	       || (std::__are_same<_Ret, int>::__value
     64 		   && (__tmp < __numeric_traits<int>::__min
     65 		       || __tmp > __numeric_traits<int>::__max)))
     66 	std::__throw_out_of_range(__name);
     67       else
     68 	__ret = __tmp;
     69 
     70       if (__idx)
     71 	*__idx = __endptr - __str;
     72 
     73       return __ret;
     74     }
     75 
     76   // Helper for the to_string / to_wstring functions.
     77   template<typename _String, typename _CharT = typename _String::value_type>
     78     _String
     79     __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*,
     80 				 __builtin_va_list), std::size_t __n,
     81 		 const _CharT* __fmt, ...)
     82     {
     83       // XXX Eventually the result will be constructed in place in
     84       // the C++0x string, likely with the help of internal hooks.
     85       _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
     86 							  * __n));
     87 
     88       __builtin_va_list __args;
     89       __builtin_va_start(__args, __fmt);
     90 
     91       const int __len = __convf(__s, __n, __fmt, __args);
     92 
     93       __builtin_va_end(__args);
     94 
     95       return _String(__s, __s + __len);
     96     }
     97 
     98 _GLIBCXX_END_NAMESPACE_VERSION
     99 } // namespace
    100 
    101 #endif // _STRING_CONVERSIONS_H
    102