37 _Underflow< char, char_traits<char> >::_M_doit(basic_filebuf<char, char_traits<char> >* __this)  in _M_doit()  argument
42   if (!__this->_M_in_input_mode) {  in _M_doit()
43     if (!__this->_M_switch_to_input_mode())  in _M_doit()
46   else if (__this->_M_in_putback_mode) {  in _M_doit()
47     __this->_M_exit_putback_mode();  in _M_doit()
48     if (__this->gptr() != __this->egptr()) {  in _M_doit()
49       int_type __c = traits_type::to_int_type(*__this->gptr());  in _M_doit()
57   if (__this->_M_base.__regular_file()  in _M_doit()
58       && __this->_M_always_noconv  in _M_doit()
59       && __this->_M_base._M_in_binary_mode()) {  in _M_doit()
61     if (__this->_M_mmap_base)  in _M_doit()
62       __this->_M_base._M_unmap(__this->_M_mmap_base, __this->_M_mmap_len);  in _M_doit()
66     streamoff __cur = __this->_M_base._M_seek(0, ios_base::cur);  in _M_doit()
67     streamoff __size = __this->_M_base._M_file_size();  in _M_doit()
69       streamoff __offset = (__cur / __this->_M_base.__page_size()) * __this->_M_base.__page_size();  in _M_doit()
72       __this->_M_mmap_len = __size - __offset;  in _M_doit()
74       if (__this->_M_mmap_len > MMAP_CHUNK)  in _M_doit()
75         __this->_M_mmap_len = MMAP_CHUNK;  in _M_doit()
77       if ((__this->_M_mmap_base = __this->_M_base._M_mmap(__offset, __this->_M_mmap_len)) != 0) {  in _M_doit()
78         __this->setg(__STATIC_CAST(char*, __this->_M_mmap_base),  in _M_doit()
79 …                __STATIC_CAST(char*, __this->_M_mmap_base) + __STATIC_CAST(ptrdiff_t, __remainder),  in _M_doit()
80 …       __STATIC_CAST(char*, __this->_M_mmap_base) + __STATIC_CAST(ptrdiff_t, __this->_M_mmap_len));  in _M_doit()
81         return traits_type::to_int_type(*__this->gptr());  in _M_doit()
84         __this->_M_mmap_len = 0;  in _M_doit()
87       __this->_M_mmap_base = 0;  in _M_doit()
88       __this->_M_mmap_len = 0;  in _M_doit()
92   return __this->_M_underflow_aux();  in _M_doit()