xref: /netbsd-src/external/gpl3/gcc/dist/libstdc++-v3/include/bits/ostream_insert.h (revision 0a3071956a3a9fdebdbf7f338cf2d439b45fc728)
1 // Helpers for ostream inserters -*- C++ -*-
2 
3 // Copyright (C) 2007-2022 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 
_GLIBCXX_VISIBILITY(default)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 	    }
107 	  __catch(__cxxabiv1::__forced_unwind&)
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 */
135