ostream_insert.h revision 303975
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