# ostream_insert.h

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    00001 // Helpers for ostream inserters -*- C++ -*-
    00002
    00003 // Copyright (C) 2007 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 2, 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 // You should have received a copy of the GNU General Public License along
    00017 // with this library; see the file COPYING.  If not, write to the Free
    00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
    00019 // USA.
    00020
    00021 // As a special exception, you may use this file as part of a free software
    00022 // library without restriction.  Specifically, if other files instantiate
    00023 // templates or use macros or inline functions from this file, or you compile
    00024 // this file and link it with other files to produce an executable, this
    00025 // file does not by itself cause the resulting executable to be covered by
    00026 // the GNU General Public License.  This exception does not however
    00027 // invalidate any other reasons why the executable file might be covered by
    00028 // the GNU General Public License.
    00029
    00030 /** @file ostream_insert.h
    00031  *  This is an internal header file, included by other library headers.
    00032  *  You should not attempt to use it directly.
    00033  */
    00034
    00035 #ifndef _OSTREAM_INSERT_H
    00036 #define _OSTREAM_INSERT_H 1
    00037
    00038 #pragma GCC system_header
    00039
    00040 #include <iosfwd>
    00041 #include <cxxabi-forced.h>
    00042
    00043 _GLIBCXX_BEGIN_NAMESPACE(std)
    00044
    00045   template<typename _CharT, typename _Traits>
    00046     inline void
    00047     __ostream_write(basic_ostream<_CharT, _Traits>& __out,
    00048             const _CharT* __s, streamsize __n)
    00049     {
    00050       typedef basic_ostream<_CharT, _Traits>       __ostream_type;
    00051       typedef typename __ostream_type::ios_base    __ios_base;
    00052
    00053       const streamsize __put = __out.rdbuf()->sputn(__s, __n);
    00054       if (__put != __n)
    00055     __out.setstate(__ios_base::badbit);
    00056     }
    00057
    00058   template<typename _CharT, typename _Traits>
    00059     inline void
    00060     __ostream_fill(basic_ostream<_CharT, _Traits>& __out, streamsize __n)
    00061     {
    00062       typedef basic_ostream<_CharT, _Traits>       __ostream_type;
    00063       typedef typename __ostream_type::ios_base    __ios_base;
    00064
    00065       const _CharT __c = __out.fill();
    00066       for (; __n > 0; --__n)
    00067     {
    00068       const typename _Traits::int_type __put = __out.rdbuf()->sputc(__c);
    00069       if (_Traits::eq_int_type(__put, _Traits::eof()))
    00070         {
    00071           __out.setstate(__ios_base::badbit);
    00072           break;
    00073         }
    00074     }
    00075     }
    00076
    00077   template<typename _CharT, typename _Traits>
    00078     basic_ostream<_CharT, _Traits>&
    00079     __ostream_insert(basic_ostream<_CharT, _Traits>& __out,
    00080              const _CharT* __s, streamsize __n)
    00081     {
    00082       typedef basic_ostream<_CharT, _Traits>       __ostream_type;
    00083       typedef typename __ostream_type::ios_base    __ios_base;
    00084
    00085       typename __ostream_type::sentry __cerb(__out);
    00086       if (__cerb)
    00087     {
    00088       try
    00089         {
    00090           const streamsize __w = __out.width();
    00091           if (__w > __n)
    00092         {
    00093           const bool __left = ((__out.flags()
    00094                     & __ios_base::adjustfield)
    00095                        == __ios_base::left);
    00096           if (!__left)
    00097             __ostream_fill(__out, __w - __n);
    00098           if (__out.good())
    00099             __ostream_write(__out, __s, __n);
    00100           if (__left && __out.good())
    00101             __ostream_fill(__out, __w - __n);
    00102         }
    00103           else
    00104         __ostream_write(__out, __s, __n);
    00105           __out.width(0);
    00106         }
    00107       catch(__cxxabiv1::__forced_unwind&)
    00108         {
    00109           __out._M_setstate(__ios_base::badbit);
    00110           __throw_exception_again;
    00111         }
    00112       catch(...)
    00113         { __out._M_setstate(__ios_base::badbit); }
    00114     }
    00115       return __out;
    00116     }
    00117
    00118   // Inhibit implicit instantiations for required instantiations,
    00119   // which are defined via explicit instantiations elsewhere.
    00120   // NB:  This syntax is a GNU extension.
    00121 #if _GLIBCXX_EXTERN_TEMPLATE
    00122   extern template ostream& __ostream_insert(ostream&, const char*, streamsize);
    00123
    00124 #ifdef _GLIBCXX_USE_WCHAR_T
    00125   extern template wostream& __ostream_insert(wostream&, const wchar_t*,
    00126                          streamsize);
    00127 #endif
    00128 #endif
    00129
    00130 _GLIBCXX_END_NAMESPACE
    00131
    00132 #endif /* _OSTREAM_INSERT_H */