libstdc++
ostream_insert.h
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1 // Helpers for ostream inserters -*- C++ -*-
2 
3 // Copyright (C) 2007-2020 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  }
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 */
basic_ostream< char > ostream
Base class for char output streams.
Definition: iosfwd:141
basic_ostream< wchar_t > wostream
Base class for wchar_t output streams.
Definition: iosfwd:181
ISO C++ entities toplevel namespace is std.
ptrdiff_t streamsize
Integral type for I/O operation counts and buffer sizes.
Definition: postypes.h:98
ios_base & left(ios_base &__base)
Calls base.setf(ios_base::left, ios_base::adjustfield).
Definition: ios_base.h:1029
Thrown as part of forced unwinding.
Definition: cxxabi_forced.h:49