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  1. // Helpers for ostream inserters -*- C++ -*-
  2.  
  3. // Copyright (C) 2007-2015 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 bits/ostream_insert.h
  26.  *  This is an internal header file, included by other library headers.
  27.  *  Do not attempt to use it directly. @headername{ostream}
  28.  */
  29.  
  30. #ifndef _OSTREAM_INSERT_H
  31. #define _OSTREAM_INSERT_H 1
  32.  
  33. #pragma GCC system_header
  34.  
  35. #include <iosfwd>
  36. #include <bits/cxxabi_forced.h>
  37.  
  38. namespace std _GLIBCXX_VISIBILITY(default)
  39. {
  40. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  41.  
  42.   template<typename _CharT, typename _Traits>
  43.     inline void
  44.     __ostream_write(basic_ostream<_CharT, _Traits>& __out,
  45.                     const _CharT* __s, streamsize __n)
  46.     {
  47.       typedef basic_ostream<_CharT, _Traits>       __ostream_type;      
  48.       typedef typename __ostream_type::ios_base    __ios_base;
  49.  
  50.       const streamsize __put = __out.rdbuf()->sputn(__s, __n);
  51.       if (__put != __n)
  52.         __out.setstate(__ios_base::badbit);
  53.     }
  54.  
  55.   template<typename _CharT, typename _Traits>
  56.     inline void
  57.     __ostream_fill(basic_ostream<_CharT, _Traits>& __out, streamsize __n)
  58.     {
  59.       typedef basic_ostream<_CharT, _Traits>       __ostream_type;      
  60.       typedef typename __ostream_type::ios_base    __ios_base;
  61.  
  62.       const _CharT __c = __out.fill();
  63.       for (; __n > 0; --__n)
  64.         {
  65.           const typename _Traits::int_type __put = __out.rdbuf()->sputc(__c);
  66.           if (_Traits::eq_int_type(__put, _Traits::eof()))
  67.             {
  68.               __out.setstate(__ios_base::badbit);
  69.               break;
  70.             }
  71.         }
  72.     }
  73.  
  74.   template<typename _CharT, typename _Traits>
  75.     basic_ostream<_CharT, _Traits>&
  76.     __ostream_insert(basic_ostream<_CharT, _Traits>& __out,
  77.                      const _CharT* __s, streamsize __n)
  78.     {
  79.       typedef basic_ostream<_CharT, _Traits>       __ostream_type;
  80.       typedef typename __ostream_type::ios_base    __ios_base;
  81.  
  82.       typename __ostream_type::sentry __cerb(__out);
  83.       if (__cerb)
  84.         {
  85.           __try
  86.             {
  87.               const streamsize __w = __out.width();
  88.               if (__w > __n)
  89.                 {
  90.                   const bool __left = ((__out.flags()
  91.                                         & __ios_base::adjustfield)
  92.                                        == __ios_base::left);
  93.                   if (!__left)
  94.                     __ostream_fill(__out, __w - __n);
  95.                   if (__out.good())
  96.                     __ostream_write(__out, __s, __n);
  97.                   if (__left && __out.good())
  98.                     __ostream_fill(__out, __w - __n);
  99.                 }
  100.               else
  101.                 __ostream_write(__out, __s, __n);
  102.               __out.width(0);
  103.             }
  104.           __catch(__cxxabiv1::__forced_unwind&)
  105.             {
  106.               __out._M_setstate(__ios_base::badbit);
  107.               __throw_exception_again;
  108.             }
  109.           __catch(...)
  110.             { __out._M_setstate(__ios_base::badbit); }
  111.         }
  112.       return __out;
  113.     }
  114.  
  115.   // Inhibit implicit instantiations for required instantiations,
  116.   // which are defined via explicit instantiations elsewhere.
  117. #if _GLIBCXX_EXTERN_TEMPLATE
  118.   extern template ostream& __ostream_insert(ostream&, const char*, streamsize);
  119.  
  120. #ifdef _GLIBCXX_USE_WCHAR_T
  121.   extern template wostream& __ostream_insert(wostream&, const wchar_t*,
  122.                                              streamsize);
  123. #endif
  124. #endif
  125.  
  126. _GLIBCXX_END_NAMESPACE_VERSION
  127. } // namespace std
  128.  
  129. #endif /* _OSTREAM_INSERT_H */
  130.