libstdc++
ostream_insert.h
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1 // Helpers for ostream inserters -*- C++ -*-
2 
3 // Copyright (C) 2007-2023 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  }
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 */
basic_ostream< wchar_t > wostream
Base class for wchar_t output streams.
Definition: iosfwd:183
ptrdiff_t streamsize
Integral type for I/O operation counts and buffer sizes.
Definition: postypes.h:68
ISO C++ entities toplevel namespace is std.
Thrown as part of forced unwinding.A magic placeholder class that can be caught by reference to recog...
Definition: cxxabi_forced.h:48
ios_base & left(ios_base &__base)
Calls base.setf(ios_base::left, ios_base::adjustfield).
Definition: ios_base.h:1042
basic_ostream< char > ostream
Base class for char output streams.
Definition: iosfwd:143