libstdc++
ostream_insert.h
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1 // Helpers for ostream inserters -*- C++ -*-
2 
3 // Copyright (C) 2007, 2008, 2009 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 ostream_insert.h
26  * This is an internal header file, included by other library headers.
27  * You should not attempt to use it directly.
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 <cxxabi-forced.h>
37 
38 _GLIBCXX_BEGIN_NAMESPACE(std)
39 
40  template<typename _CharT, typename _Traits>
41  inline void
42  __ostream_write(basic_ostream<_CharT, _Traits>& __out,
43  const _CharT* __s, streamsize __n)
44  {
45  typedef basic_ostream<_CharT, _Traits> __ostream_type;
46  typedef typename __ostream_type::ios_base __ios_base;
47 
48  const streamsize __put = __out.rdbuf()->sputn(__s, __n);
49  if (__put != __n)
50  __out.setstate(__ios_base::badbit);
51  }
52 
53  template<typename _CharT, typename _Traits>
54  inline void
55  __ostream_fill(basic_ostream<_CharT, _Traits>& __out, streamsize __n)
56  {
57  typedef basic_ostream<_CharT, _Traits> __ostream_type;
58  typedef typename __ostream_type::ios_base __ios_base;
59 
60  const _CharT __c = __out.fill();
61  for (; __n > 0; --__n)
62  {
63  const typename _Traits::int_type __put = __out.rdbuf()->sputc(__c);
64  if (_Traits::eq_int_type(__put, _Traits::eof()))
65  {
66  __out.setstate(__ios_base::badbit);
67  break;
68  }
69  }
70  }
71 
72  template<typename _CharT, typename _Traits>
73  basic_ostream<_CharT, _Traits>&
74  __ostream_insert(basic_ostream<_CharT, _Traits>& __out,
75  const _CharT* __s, streamsize __n)
76  {
77  typedef basic_ostream<_CharT, _Traits> __ostream_type;
78  typedef typename __ostream_type::ios_base __ios_base;
79 
80  typename __ostream_type::sentry __cerb(__out);
81  if (__cerb)
82  {
83  __try
84  {
85  const streamsize __w = __out.width();
86  if (__w > __n)
87  {
88  const bool __left = ((__out.flags()
89  & __ios_base::adjustfield)
90  == __ios_base::left);
91  if (!__left)
92  __ostream_fill(__out, __w - __n);
93  if (__out.good())
94  __ostream_write(__out, __s, __n);
95  if (__left && __out.good())
96  __ostream_fill(__out, __w - __n);
97  }
98  else
99  __ostream_write(__out, __s, __n);
100  __out.width(0);
101  }
103  {
104  __out._M_setstate(__ios_base::badbit);
105  __throw_exception_again;
106  }
107  __catch(...)
108  { __out._M_setstate(__ios_base::badbit); }
109  }
110  return __out;
111  }
112 
113  // Inhibit implicit instantiations for required instantiations,
114  // which are defined via explicit instantiations elsewhere.
115  // NB: This syntax is a GNU extension.
116 #if _GLIBCXX_EXTERN_TEMPLATE
117  extern template ostream& __ostream_insert(ostream&, const char*, streamsize);
118 
119 #ifdef _GLIBCXX_USE_WCHAR_T
120  extern template wostream& __ostream_insert(wostream&, const wchar_t*,
121  streamsize);
122 #endif
123 #endif
124 
125 _GLIBCXX_END_NAMESPACE
126 
127 #endif /* _OSTREAM_INSERT_H */