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Diffstat (limited to 'contrib/libstdc++/config/io/basic_file_libio.h')
| -rw-r--r-- | contrib/libstdc++/config/io/basic_file_libio.h | 498 |
1 files changed, 498 insertions, 0 deletions
diff --git a/contrib/libstdc++/config/io/basic_file_libio.h b/contrib/libstdc++/config/io/basic_file_libio.h new file mode 100644 index 0000000..57d83c4 --- /dev/null +++ b/contrib/libstdc++/config/io/basic_file_libio.h @@ -0,0 +1,498 @@ +// Wrapper of C-language FILE struct -*- C++ -*- + +// Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 2, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING. If not, write to the Free +// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, +// USA. + +// As a special exception, you may use this file as part of a free software +// library without restriction. Specifically, if other files instantiate +// templates or use macros or inline functions from this file, or you compile +// this file and link it with other files to produce an executable, this +// file does not by itself cause the resulting executable to be covered by +// the GNU General Public License. This exception does not however +// invalidate any other reasons why the executable file might be covered by +// the GNU General Public License. + +// +// ISO C++ 14882: 27.8 File-based streams +// + +/** @file basic_file.h + * This is an internal header file, included by other library headers. + * You should not attempt to use it directly. + */ + +#ifndef _CPP_BASIC_FILE +#define _CPP_BASIC_FILE 1 + +#pragma GCC system_header + +#include <bits/c++config.h> +#include <ios> +#include <libioP.h> + +namespace std +{ + // Ulrich is going to make some detailed comment here, explaining + // all this unpleasantness, providing detailed performance analysis + // as to why we have to do all this lame vtable hacking instead of a + // sane, function-based approach. This verbiage will provide a clear + // and detailed description of the whole object-layout, + // vtable-swapping, sordid history of this hack. + template<typename _CharT> + struct __basic_file_base: public __c_file_type + { + virtual + ~__basic_file_base() { }; + + virtual int + overflow(int __c = EOF) = 0; + + virtual int + underflow() = 0; + + virtual int + uflow() = 0; + + virtual int + pbackfail(int __c) = 0; + + virtual streamsize + xsputn(const _CharT* __s, streamsize __n) = 0; + + virtual streamsize + xsgetn(_CharT* __s, streamsize __n) = 0; + + virtual streamoff + seekoff(streamoff __off, ios_base::seekdir __way, + ios_base::openmode __mode = ios_base::in | ios_base::out) = 0; + + virtual streamoff + seekpos(streamoff __pos, + ios_base::openmode __mode = ios_base::in | ios_base::out) = 0; + + virtual streambuf* + setbuf(_CharT* __b, int __len) = 0; + + virtual int + sync() = 0; + + virtual int + doallocate() = 0; + + virtual streamsize + sys_read(_CharT* __s, streamsize __n) = 0; + + virtual streamsize + sys_write(const _CharT* __s, streamsize __n) = 0; + + virtual streamoff + sys_seek(streamoff __off, ios_base::seekdir __way) = 0; + + virtual int + sys_close() = 0; + + virtual int + sys_stat(void* __v) = 0; + + virtual int + showmanyc() = 0; + + virtual void + imbue(void* __v) = 0; + }; + + // Some of these member functions are based on libio/filebuf.cc. + // Also note that the order and number of virtual functions has to precisely + // match the order and number in the _IO_jump_t struct defined in libioP.h. + template<typename _CharT> + class __basic_file: public __basic_file_base<_CharT> + { +# ifdef _GLIBCPP_USE_WCHAR_T + __c_wfile_type _M_wfile; +# endif + + public: + __basic_file(__c_lock* __lock = 0); + + void + _M_open_mode(ios_base::openmode __mode, int& __p_mode, int& __rw_mode, + char* __c_mode); + + // Equivalent to the normal fopen function. + __basic_file* + open(const char* __name, ios_base::openmode __mode, int __prot = 0664); + + // Used for opening the standard streams, cin, cout, cerr, clog, + // and their wide-stream equivalents. Instead of calling open, it + // just sets + // - for libio: __c_file_type->_fileno and the respective _flags bits + // - for stdio: _M_cfile = __file and some internal flags + // and returns. + __basic_file* + sys_open(__c_file_type* __file, ios_base::openmode __mode); + + _CharT + sys_getc(); + + _CharT + sys_ungetc(_CharT); + + __basic_file* + close(); + + bool + is_open(); + + int + fd(); + + // NB: Must match FILE specific jump table starting here--this + // means all virtual functions starting with the dtor must match, + // slot by slot. For glibc-based dystems, this means the _IO_FILE + // as the FILE struct and _IO_jump_t as the jump table. + virtual + ~__basic_file(); // Takes the place of __finish. + + virtual int + overflow(int __c = EOF); + + virtual int + underflow(); + + virtual int + uflow(); + + virtual int + pbackfail(int __c); + + // A complex "write" function that sets all of __c_file_type's + // pointers and associated data members correctly and manages its + // relation to the external byte sequence. + virtual streamsize + xsputn(const _CharT* __s, streamsize __n); + + // A complex "read" function that sets all of __c_file_type's + // pointers and associated data members correctly and manages its + // relation to the external byte sequence. + virtual streamsize + xsgetn(_CharT* __s, streamsize __n); + + // A complex "seekoff" function that sets all of __c_file_type's + // pointers and associated data members correctly and manages its + // relation to the external byte sequence. + virtual streamoff + seekoff(streamoff __off, ios_base::seekdir __way, + ios_base::openmode __mode = ios_base::in | ios_base::out); + + // A complex "seekpos" function that sets all of __c_file_type's + // pointers and associated data members correctly and manages its + // relation to the external byte sequence. + virtual streamoff + seekpos(streamoff __pos, + ios_base::openmode __mode = ios_base::in | ios_base::out); + + virtual streambuf* + setbuf(_CharT* __b, int __len); + + virtual int + sync(); + + virtual int + doallocate(); + + // A simple read function for the external byte sequence, that + // does no mucking around with or setting of the pointers or flags + // in __c_file_type. + virtual streamsize + sys_read(_CharT* __s, streamsize __n); + + // A simple write function for the external byte sequence, that + // does no mucking around with or setting of the pointers or flags + // in __c_file_type. + virtual streamsize + sys_write(const _CharT* __s, streamsize __n); + + // A simple seek function for the external byte sequence, that + // does no mucking around with or setting of the pointers or flags + // in __c_file_type. + virtual streamoff + sys_seek(streamoff __off, ios_base::seekdir __way); + + virtual int + sys_close(); + + virtual int + sys_stat(void* __v); + + virtual int + showmanyc(); + + virtual void + imbue(void* __v); + }; + + // __basic_file<char> specializations + template<> + __basic_file<char>::__basic_file(__c_lock* __lock); + + template<> + int + __basic_file<char>::overflow(int __c); + + template<> + int + __basic_file<char>::underflow(); + + template<> + int + __basic_file<char>::uflow(); + + template<> + int + __basic_file<char>::pbackfail(int __c); + + template<> + streamsize + __basic_file<char>::xsputn(const char* __s, streamsize __n); + + template<> + streamoff + __basic_file<char>::seekoff(streamoff __off, ios_base::seekdir __way, + ios_base::openmode __mode); + + template<> + streamoff + __basic_file<char>::seekpos(streamoff __pos, ios_base::openmode __mode); + + template<> + streambuf* + __basic_file<char>::setbuf(char* __b, int __len); + + template<> + int + __basic_file<char>::sync(); + + template<> + int + __basic_file<char>::doallocate(); + + // __basic_file<wchar_t> specializations +#ifdef _GLIBCPP_USE_WCHAR_T + template<> + __basic_file<wchar_t>::__basic_file(__c_lock* __lock); + + template<> + int + __basic_file<wchar_t>::overflow(int __c); + + template<> + int + __basic_file<wchar_t>::underflow(); + + template<> + int + __basic_file<wchar_t>::uflow(); + + template<> + int + __basic_file<wchar_t>::pbackfail(int __c); + + template<> + streamsize + __basic_file<wchar_t>::xsputn(const wchar_t* __s, streamsize __n); + + template<> + streamoff + __basic_file<wchar_t>::seekoff(streamoff __off, ios_base::seekdir __way, + ios_base::openmode __mode); + + template<> + streamoff + __basic_file<wchar_t>::seekpos(streamoff __pos, ios_base::openmode __mode); + + template<> + streambuf* + __basic_file<wchar_t>::setbuf(wchar_t* __b, int __len); + + template<> + int + __basic_file<wchar_t>::sync(); + + template<> + int + __basic_file<wchar_t>::doallocate(); +#endif + + template<typename _CharT> + __basic_file<_CharT>::~__basic_file() + { _IO_file_finish(this, 0); } + + template<typename _CharT> + void + __basic_file<_CharT>::_M_open_mode(ios_base::openmode __mode, + int& __p_mode, int& __rw_mode, + char* /*__c_mode*/) + { +#ifdef O_BINARY + bool __testb = __mode & ios_base::binary; +#endif + bool __testi = __mode & ios_base::in; + bool __testo = __mode & ios_base::out; + bool __testt = __mode & ios_base::trunc; + bool __testa = __mode & ios_base::app; + + if (!__testi && __testo && !__testt && !__testa) + { + __p_mode = O_WRONLY | O_TRUNC | O_CREAT; + __rw_mode = _IO_NO_READS; + } + if (!__testi && __testo && !__testt && __testa) + { + __p_mode = O_WRONLY | O_APPEND | O_CREAT; + __rw_mode = _IO_NO_READS | _IO_IS_APPENDING; + } + if (!__testi && __testo && __testt && !__testa) + { + __p_mode = O_WRONLY | O_TRUNC | O_CREAT; + __rw_mode = _IO_NO_READS; + } + if (__testi && !__testo && !__testt && !__testa) + { + __p_mode = O_RDONLY; + __rw_mode = _IO_NO_WRITES; + } + if (__testi && __testo && !__testt && !__testa) + { + __p_mode = O_RDWR; + __rw_mode = 0; + } + if (__testi && __testo && __testt && !__testa) + { + __p_mode = O_RDWR | O_TRUNC | O_CREAT; + __rw_mode = 0; + } +#ifdef O_BINARY + if (__testb) + __p_mode |= O_BINARY; +#endif + } + + template<typename _CharT> + __basic_file<_CharT>* + __basic_file<_CharT>::sys_open(__c_file_type* __f, + ios_base::openmode __mode) + { + __basic_file* __ret = NULL; + int __fd = fileno(__f); + int __p_mode = 0; + int __rw_mode = _IO_NO_READS + _IO_NO_WRITES; + char __c_mode[4]; + + _M_open_mode(__mode, __p_mode, __rw_mode, __c_mode); + + if (!_IO_file_is_open(this)) + { + _fileno = __fd; + _flags &= ~(_IO_NO_READS + _IO_NO_WRITES); + _flags |= _IO_DELETE_DONT_CLOSE; + _offset = _IO_pos_BAD; + int __mask = _IO_NO_READS + _IO_NO_WRITES + _IO_IS_APPENDING; + _IO_mask_flags(this, __rw_mode, __mask); + } + + return __ret; + } + + template<typename _CharT> + __basic_file<_CharT>* + __basic_file<_CharT>::open(const char* __name, ios_base::openmode __mode, + int __prot) + { + __basic_file* __ret = NULL; + int __p_mode = 0; + int __rw_mode = _IO_NO_READS + _IO_NO_WRITES; + char __c_mode[4]; + + _M_open_mode(__mode, __p_mode, __rw_mode, __c_mode); + if (!_IO_file_is_open(this)) + { + __c_file_type* __f; + __f = _IO_file_open(this, __name, __p_mode, __prot, __rw_mode, 0); + __ret = __f ? this: NULL; + } + return __ret; + } + + template<typename _CharT> + bool + __basic_file<_CharT>::is_open() { return _fileno >= 0; } + + template<typename _CharT> + __basic_file<_CharT>* + __basic_file<_CharT>::close() + { + return _IO_file_close_it(this) ? static_cast<__basic_file*>(NULL) : this; + } + + template<typename _CharT> + streamsize + __basic_file<_CharT>::xsgetn(_CharT* __s, streamsize __n) + { return _IO_file_xsgetn(this, __s, __n); } + + // NB: Unused. + template<typename _CharT> + streamsize + __basic_file<_CharT>::sys_read(_CharT* __s, streamsize __n) + { return _IO_file_read(this, __s, __n); } + + // NB: Unused. + template<typename _CharT> + streamsize + __basic_file<_CharT>::sys_write(const _CharT* __s, streamsize __n) + { return _IO_file_write(this, __s, __n); } + + // NB: Unused. + template<typename _CharT> + streamoff + __basic_file<_CharT>::sys_seek(streamoff __pos, ios_base::seekdir __way) + { return _IO_file_seek(this, __pos, __way); } + + // NB: Unused. + template<typename _CharT> + int + __basic_file<_CharT>::sys_close() + { return _IO_file_close(this); } + + // NB: Unused. + template<typename _CharT> + int + __basic_file<_CharT>::sys_stat(void* __v) + { return _IO_file_stat(this, __v); } + + // NB: Unused. + template<typename _CharT> + int + __basic_file<_CharT>::showmanyc() { return EOF; } + + // NB: Unused. + template<typename _CharT> + void + __basic_file<_CharT>::imbue(void* /*__v*/) { } +} // namespace std + +#endif // _CPP_BASIC_FILE |
