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      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