1 // Helpers for ostream inserters -*- C++ -*-
2
3 // Copyright (C) 2007 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 2, 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 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING. If not, write to the Free
18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
19 // USA.
20
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
29
30 /** @file ostream_insert.h
31 * This is an internal header file, included by other library headers.
32 * You should not attempt to use it directly.
33 */
34
35 #ifndef _OSTREAM_INSERT_H
36 #define _OSTREAM_INSERT_H 1
37
38 #pragma GCC system_header
39
40 #include <iosfwd>
41
_GLIBCXX_BEGIN_NAMESPACE(std)42 _GLIBCXX_BEGIN_NAMESPACE(std)
43
44 template<typename _CharT, typename _Traits>
45 inline void
46 __ostream_write(basic_ostream<_CharT, _Traits>& __out,
47 const _CharT* __s, streamsize __n)
48 {
49 typedef basic_ostream<_CharT, _Traits> __ostream_type;
50 typedef typename __ostream_type::ios_base __ios_base;
51
52 const streamsize __put = __out.rdbuf()->sputn(__s, __n);
53 if (__put != __n)
54 __out.setstate(__ios_base::badbit);
55 }
56
57 template<typename _CharT, typename _Traits>
58 inline void
__ostream_fill(basic_ostream<_CharT,_Traits> & __out,streamsize __n)59 __ostream_fill(basic_ostream<_CharT, _Traits>& __out, streamsize __n)
60 {
61 typedef basic_ostream<_CharT, _Traits> __ostream_type;
62 typedef typename __ostream_type::ios_base __ios_base;
63
64 const _CharT __c = __out.fill();
65 for (; __n > 0; --__n)
66 {
67 const typename _Traits::int_type __put = __out.rdbuf()->sputc(__c);
68 if (_Traits::eq_int_type(__put, _Traits::eof()))
69 {
70 __out.setstate(__ios_base::badbit);
71 break;
72 }
73 }
74 }
75
76 template<typename _CharT, typename _Traits>
77 basic_ostream<_CharT, _Traits>&
__ostream_insert(basic_ostream<_CharT,_Traits> & __out,const _CharT * __s,streamsize __n)78 __ostream_insert(basic_ostream<_CharT, _Traits>& __out,
79 const _CharT* __s, streamsize __n)
80 {
81 typedef basic_ostream<_CharT, _Traits> __ostream_type;
82 typedef typename __ostream_type::ios_base __ios_base;
83
84 typename __ostream_type::sentry __cerb(__out);
85 if (__cerb)
86 {
87 try
88 {
89 const streamsize __w = __out.width();
90 if (__w > __n)
91 {
92 const bool __left = ((__out.flags()
93 & __ios_base::adjustfield)
94 == __ios_base::left);
95 if (!__left)
96 __ostream_fill(__out, __w - __n);
97 if (__out.good())
98 __ostream_write(__out, __s, __n);
99 if (__left && __out.good())
100 __ostream_fill(__out, __w - __n);
101 }
102 else
103 __ostream_write(__out, __s, __n);
104 __out.width(0);
105 }
106 catch(...)
107 { __out._M_setstate(__ios_base::badbit); }
108 }
109 return __out;
110 }
111
112 // Inhibit implicit instantiations for required instantiations,
113 // which are defined via explicit instantiations elsewhere.
114 // NB: This syntax is a GNU extension.
115 #if _GLIBCXX_EXTERN_TEMPLATE
116 extern template ostream& __ostream_insert(ostream&, const char*, streamsize);
117
118 #ifdef _GLIBCXX_USE_WCHAR_T
119 extern template wostream& __ostream_insert(wostream&, const wchar_t*,
120 streamsize);
121 #endif
122 #endif
123
124 _GLIBCXX_END_NAMESPACE
125
126 #endif /* _OSTREAM_INSERT_H */
127