libstdc++

ostream_insert.h
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1 // Helpers for ostream inserters -*- C++ -*-
2
3 // Copyright (C) 2007-2013 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 }
104 __catch(__cxxabiv1::__forced_unwind&)
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 */