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      1 // Helpers for ostream inserters -*- C++ -*-
      2 
      3 // Copyright (C) 2007-2022 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 #include <bits/exception_defines.h>
     38 
     39 namespace std _GLIBCXX_VISIBILITY(default)
     40 {
     41 _GLIBCXX_BEGIN_NAMESPACE_VERSION
     42 
     43   /// @cond undocumented
     44 
     45   template<typename _CharT, typename _Traits>
     46     inline void
     47     __ostream_write(basic_ostream<_CharT, _Traits>& __out,
     48 		    const _CharT* __s, streamsize __n)
     49     {
     50       typedef basic_ostream<_CharT, _Traits>       __ostream_type;
     51       typedef typename __ostream_type::ios_base    __ios_base;
     52 
     53       const streamsize __put = __out.rdbuf()->sputn(__s, __n);
     54       if (__put != __n)
     55 	__out.setstate(__ios_base::badbit);
     56     }
     57 
     58   template<typename _CharT, typename _Traits>
     59     inline void
     60     __ostream_fill(basic_ostream<_CharT, _Traits>& __out, streamsize __n)
     61     {
     62       typedef basic_ostream<_CharT, _Traits>       __ostream_type;
     63       typedef typename __ostream_type::ios_base    __ios_base;
     64 
     65       const _CharT __c = __out.fill();
     66       for (; __n > 0; --__n)
     67 	{
     68 	  const typename _Traits::int_type __put = __out.rdbuf()->sputc(__c);
     69 	  if (_Traits::eq_int_type(__put, _Traits::eof()))
     70 	    {
     71 	      __out.setstate(__ios_base::badbit);
     72 	      break;
     73 	    }
     74 	}
     75     }
     76 
     77   template<typename _CharT, typename _Traits>
     78     basic_ostream<_CharT, _Traits>&
     79     __ostream_insert(basic_ostream<_CharT, _Traits>& __out,
     80 		     const _CharT* __s, streamsize __n)
     81     {
     82       typedef basic_ostream<_CharT, _Traits>       __ostream_type;
     83       typedef typename __ostream_type::ios_base    __ios_base;
     84 
     85       typename __ostream_type::sentry __cerb(__out);
     86       if (__cerb)
     87 	{
     88 	  __try
     89 	    {
     90 	      const streamsize __w = __out.width();
     91 	      if (__w > __n)
     92 		{
     93 		  const bool __left = ((__out.flags()
     94 					& __ios_base::adjustfield)
     95 				       == __ios_base::left);
     96 		  if (!__left)
     97 		    __ostream_fill(__out, __w - __n);
     98 		  if (__out.good())
     99 		    __ostream_write(__out, __s, __n);
    100 		  if (__left && __out.good())
    101 		    __ostream_fill(__out, __w - __n);
    102 		}
    103 	      else
    104 		__ostream_write(__out, __s, __n);
    105 	      __out.width(0);
    106 	    }
    107 	  __catch(__cxxabiv1::__forced_unwind&)
    108 	    {
    109 	      __out._M_setstate(__ios_base::badbit);
    110 	      __throw_exception_again;
    111 	    }
    112 	  __catch(...)
    113 	    { __out._M_setstate(__ios_base::badbit); }
    114 	}
    115       return __out;
    116     }
    117 
    118   // Inhibit implicit instantiations for required instantiations,
    119   // which are defined via explicit instantiations elsewhere.
    120 #if _GLIBCXX_EXTERN_TEMPLATE
    121   extern template ostream& __ostream_insert(ostream&, const char*, streamsize);
    122 
    123 #ifdef _GLIBCXX_USE_WCHAR_T
    124   extern template wostream& __ostream_insert(wostream&, const wchar_t*,
    125 					     streamsize);
    126 #endif
    127 #endif
    128 
    129   /// @endcond
    130 
    131 _GLIBCXX_END_NAMESPACE_VERSION
    132 } // namespace std
    133 
    134 #endif /* _OSTREAM_INSERT_H */
    135