ostream_insert.h source code [include/c++/7/bits/ostream

1	// Helpers for ostream inserters -- C++ --
2
3	// Copyright (C) 2007-2017 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 */
130

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