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  1. // String Conversions -*- C++ -*-
  2.  
  3. // Copyright (C) 2008-2015 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.       errno = 0;
  62.       const _TRet __tmp = __convf(__str, &__endptr, __base...);
  63.  
  64.       if (__endptr == __str)
  65.         std::__throw_invalid_argument(__name);
  66.       else if (errno == ERANGE
  67.                || (std::__are_same<_Ret, int>::__value
  68.                    && (__tmp < __numeric_traits<int>::__min
  69.                        || __tmp > __numeric_traits<int>::__max)))
  70.         std::__throw_out_of_range(__name);
  71.       else
  72.         __ret = __tmp;
  73.  
  74.       if (__idx)
  75.         *__idx = __endptr - __str;
  76.  
  77.       return __ret;
  78.     }
  79.  
  80.   // Helper for the to_string / to_wstring functions.
  81.   template<typename _String, typename _CharT = typename _String::value_type>
  82.     _String
  83.     __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*,
  84.                                  __builtin_va_list), std::size_t __n,
  85.                  const _CharT* __fmt, ...)
  86.     {
  87.       // XXX Eventually the result will be constructed in place in
  88.       // the C++0x string, likely with the help of internal hooks.
  89.       _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
  90.                                                           * __n));
  91.  
  92.       __builtin_va_list __args;
  93.       __builtin_va_start(__args, __fmt);
  94.  
  95.       const int __len = __convf(__s, __n, __fmt, __args);
  96.  
  97.       __builtin_va_end(__args);
  98.  
  99.       return _String(__s, __s + __len);
  100.     }
  101.  
  102. _GLIBCXX_END_NAMESPACE_VERSION
  103. } // namespace
  104.  
  105. #endif // C++11
  106.  
  107. #endif // _STRING_CONVERSIONS_H
  108.