177dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner/* 277dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * Copyright (c) 1999 377dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * Silicon Graphics Computer Systems, Inc. 477dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * 577dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * Copyright (c) 1999 677dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * Boris Fomitchev 777dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * 877dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * This material is provided "as is", with absolutely no warranty expressed 977dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * or implied. Any use is at your own risk. 1077dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * 1177dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * Permission to use or copy this software for any purpose is hereby granted 1277dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * without fee, provided the above notices are retained on all copies. 1377dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * Permission to modify the code and to distribute modified code is granted, 1477dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * provided the above notices are retained, and a notice that the code was 1577dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * modified is included with the above copyright notice. 1677dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner * 1777dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner */ 1877dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 1977dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner#include "stlport_prefix.h" 2077dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 2177dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner#ifdef _STLP_USE_UNIX_IO 2277dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner# include "details/fstream_unistd.cpp" 2377dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner#elif defined(_STLP_USE_STDIO_IO) 2477dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner# include "details/fstream_stdio.cpp" 2577dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner#elif defined(_STLP_USE_WIN32_IO) 2677dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner# include "details/fstream_win32io.cpp" 2777dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner#else 2877dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner# error "Can't recognize IO scheme to use" 2977dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner#endif 3077dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 3177dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner_STLP_BEGIN_NAMESPACE 3277dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 3377dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner// fbp : let us map 1 MB maximum, just be sure not to trash VM 3477dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner#define MMAP_CHUNK 0x100000L 3577dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 3677dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner_Underflow< char, char_traits<char> >::int_type _STLP_CALL 3777dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner_Underflow< char, char_traits<char> >::_M_doit(basic_filebuf<char, char_traits<char> >* __this) 3877dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner{ 3977dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner typedef char_traits<char> traits_type; 4077dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner typedef traits_type::int_type int_type; 4177dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 4277dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner if (!__this->_M_in_input_mode) { 4377dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner if (!__this->_M_switch_to_input_mode()) 4477dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner return traits_type::eof(); 4577dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner } 4677dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner else if (__this->_M_in_putback_mode) { 4777dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner __this->_M_exit_putback_mode(); 4877dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner if (__this->gptr() != __this->egptr()) { 4977dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner int_type __c = traits_type::to_int_type(*__this->gptr()); 5077dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner return __c; 5177dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner } 5277dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner } 5377dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 5477dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner // If it's a disk file, and if the internal and external character 5577dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner // sequences are guaranteed to be identical, then try to use memory 5677dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner // mapped I/O. Otherwise, revert to ordinary read. 5777dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner if (__this->_M_base.__regular_file() 5877dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner && __this->_M_always_noconv 5977dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner && __this->_M_base._M_in_binary_mode()) { 6077dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner // If we've mmapped part of the file already, then unmap it. 6177dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner if (__this->_M_mmap_base) 6277dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner __this->_M_base._M_unmap(__this->_M_mmap_base, __this->_M_mmap_len); 6377dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 6477dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner // Determine the position where we start mapping. It has to be 6577dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner // a multiple of the page size. 6677dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner streamoff __cur = __this->_M_base._M_seek(0, ios_base::cur); 6777dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner streamoff __size = __this->_M_base._M_file_size(); 6877dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner if (__size > 0 && __cur >= 0 && __cur < __size) { 6977dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner streamoff __offset = (__cur / __this->_M_base.__page_size()) * __this->_M_base.__page_size(); 7077dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner streamoff __remainder = __cur - __offset; 7177dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 7277dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner __this->_M_mmap_len = __size - __offset; 7377dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 7477dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner if (__this->_M_mmap_len > MMAP_CHUNK) 7577dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner __this->_M_mmap_len = MMAP_CHUNK; 7677dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 7777dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner if ((__this->_M_mmap_base = __this->_M_base._M_mmap(__offset, __this->_M_mmap_len)) != 0) { 7877dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner __this->setg(__STATIC_CAST(char*, __this->_M_mmap_base), 7977dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner __STATIC_CAST(char*, __this->_M_mmap_base) + __STATIC_CAST(ptrdiff_t, __remainder), 8077dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner __STATIC_CAST(char*, __this->_M_mmap_base) + __STATIC_CAST(ptrdiff_t, __this->_M_mmap_len)); 8177dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner return traits_type::to_int_type(*__this->gptr()); 8277dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner } 8377dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner else 8477dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner __this->_M_mmap_len = 0; 8577dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner } 8677dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner else { 8777dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner __this->_M_mmap_base = 0; 8877dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner __this->_M_mmap_len = 0; 8977dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner } 9077dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner } 9177dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 9277dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner return __this->_M_underflow_aux(); 9377dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner} 9477dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 9577dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner//---------------------------------------------------------------------- 9677dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner// Force instantiation of filebuf and fstream classes. 9777dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner#if !defined(_STLP_NO_FORCE_INSTANTIATE) 9877dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 9977dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turnertemplate class basic_filebuf<char, char_traits<char> >; 10077dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turnertemplate class basic_ifstream<char, char_traits<char> >; 10177dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turnertemplate class basic_ofstream<char, char_traits<char> >; 10277dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turnertemplate class basic_fstream<char, char_traits<char> >; 10377dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 10477dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner# if !defined (_STLP_NO_WCHAR_T) 10577dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turnertemplate class _Underflow<wchar_t, char_traits<wchar_t> >; 10677dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turnertemplate class basic_filebuf<wchar_t, char_traits<wchar_t> >; 10777dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turnertemplate class basic_ifstream<wchar_t, char_traits<wchar_t> >; 10877dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turnertemplate class basic_ofstream<wchar_t, char_traits<wchar_t> >; 10977dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turnertemplate class basic_fstream<wchar_t, char_traits<wchar_t> >; 11077dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner# endif /* _STLP_NO_WCHAR_T */ 11177dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 11277dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner#endif 11377dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner 11477dc872c5c4ae67e051d1bf7edf96ce36c7b9be2David 'Digit' Turner_STLP_END_NAMESPACE 115