ostream_insert.h

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00001 // Helpers for ostream inserters -*- C++ -*-
00002 
00003 // Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 3, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 /** @file ostream_insert.h
00026  *  This is an internal header file, included by other library headers.
00027  *  You should not attempt to use it directly.
00028  */
00029 
00030 #ifndef _OSTREAM_INSERT_H
00031 #define _OSTREAM_INSERT_H 1
00032 
00033 #pragma GCC system_header
00034 
00035 #include <iosfwd>
00036 #include <cxxabi-forced.h>
00037 
00038 _GLIBCXX_BEGIN_NAMESPACE(std)
00039 
00040   template<typename _CharT, typename _Traits>
00041     inline void
00042     __ostream_write(basic_ostream<_CharT, _Traits>& __out,
00043             const _CharT* __s, streamsize __n)
00044     {
00045       typedef basic_ostream<_CharT, _Traits>       __ostream_type;      
00046       typedef typename __ostream_type::ios_base    __ios_base;
00047 
00048       const streamsize __put = __out.rdbuf()->sputn(__s, __n);
00049       if (__put != __n)
00050     __out.setstate(__ios_base::badbit);
00051     }
00052 
00053   template<typename _CharT, typename _Traits>
00054     inline void
00055     __ostream_fill(basic_ostream<_CharT, _Traits>& __out, streamsize __n)
00056     {
00057       typedef basic_ostream<_CharT, _Traits>       __ostream_type;      
00058       typedef typename __ostream_type::ios_base    __ios_base;
00059 
00060       const _CharT __c = __out.fill();
00061       for (; __n > 0; --__n)
00062     {
00063       const typename _Traits::int_type __put = __out.rdbuf()->sputc(__c);
00064       if (_Traits::eq_int_type(__put, _Traits::eof()))
00065         {
00066           __out.setstate(__ios_base::badbit);
00067           break;
00068         }
00069     }
00070     }
00071 
00072   template<typename _CharT, typename _Traits>
00073     basic_ostream<_CharT, _Traits>&
00074     __ostream_insert(basic_ostream<_CharT, _Traits>& __out,
00075              const _CharT* __s, streamsize __n)
00076     {
00077       typedef basic_ostream<_CharT, _Traits>       __ostream_type;
00078       typedef typename __ostream_type::ios_base    __ios_base;
00079 
00080       typename __ostream_type::sentry __cerb(__out);
00081       if (__cerb)
00082     {
00083       __try
00084         {
00085           const streamsize __w = __out.width();
00086           if (__w > __n)
00087         {
00088           const bool __left = ((__out.flags()
00089                     & __ios_base::adjustfield)
00090                        == __ios_base::left);
00091           if (!__left)
00092             __ostream_fill(__out, __w - __n);
00093           if (__out.good())
00094             __ostream_write(__out, __s, __n);
00095           if (__left && __out.good())
00096             __ostream_fill(__out, __w - __n);
00097         }
00098           else
00099         __ostream_write(__out, __s, __n);
00100           __out.width(0);
00101         }
00102       __catch(__cxxabiv1::__forced_unwind&)
00103         {
00104           __out._M_setstate(__ios_base::badbit);
00105           __throw_exception_again;
00106         }
00107       __catch(...)
00108         { __out._M_setstate(__ios_base::badbit); }
00109     }
00110       return __out;
00111     }
00112 
00113   // Inhibit implicit instantiations for required instantiations,
00114   // which are defined via explicit instantiations elsewhere.
00115   // NB:  This syntax is a GNU extension.
00116 #if _GLIBCXX_EXTERN_TEMPLATE
00117   extern template ostream& __ostream_insert(ostream&, const char*, streamsize);
00118 
00119 #ifdef _GLIBCXX_USE_WCHAR_T
00120   extern template wostream& __ostream_insert(wostream&, const wchar_t*,
00121                          streamsize);
00122 #endif
00123 #endif
00124 
00125 _GLIBCXX_END_NAMESPACE
00126 
00127 #endif /* _OSTREAM_INSERT_H */

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