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 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 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>& 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