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comparison: build/stlport/src/fstream.cpp
build/stlport/src/fstream.cpp
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| -1:000000000000 | 0:a2a0d6b8b824 |
|---|---|
| 1 /* | |
| 2 * Copyright (c) 1999 | |
| 3 * Silicon Graphics Computer Systems, Inc. | |
| 4 * | |
| 5 * Copyright (c) 1999 | |
| 6 * Boris Fomitchev | |
| 7 * | |
| 8 * This material is provided "as is", with absolutely no warranty expressed | |
| 9 * or implied. Any use is at your own risk. | |
| 10 * | |
| 11 * Permission to use or copy this software for any purpose is hereby granted | |
| 12 * without fee, provided the above notices are retained on all copies. | |
| 13 * Permission to modify the code and to distribute modified code is granted, | |
| 14 * provided the above notices are retained, and a notice that the code was | |
| 15 * modified is included with the above copyright notice. | |
| 16 * | |
| 17 */ | |
| 18 | |
| 19 #include "stlport_prefix.h" | |
| 20 | |
| 21 #ifdef _STLP_USE_UNIX_IO | |
| 22 # include "details/fstream_unistd.cpp" | |
| 23 #elif defined(_STLP_USE_STDIO_IO) | |
| 24 # include "details/fstream_stdio.cpp" | |
| 25 #elif defined(_STLP_USE_WIN32_IO) | |
| 26 # include "details/fstream_win32io.cpp" | |
| 27 #else | |
| 28 # error "Can't recognize IO scheme to use" | |
| 29 #endif | |
| 30 | |
| 31 _STLP_BEGIN_NAMESPACE | |
| 32 | |
| 33 // fbp : let us map 1 MB maximum, just be sure not to trash VM | |
| 34 #define MMAP_CHUNK 0x100000L | |
| 35 | |
| 36 _Underflow< char, char_traits<char> >::int_type _STLP_CALL | |
| 37 _Underflow< char, char_traits<char> >::_M_doit(basic_filebuf<char, char_traits<char> >* __this) | |
| 38 { | |
| 39 typedef char_traits<char> traits_type; | |
| 40 typedef traits_type::int_type int_type; | |
| 41 | |
| 42 if (!__this->_M_in_input_mode) { | |
| 43 if (!__this->_M_switch_to_input_mode()) | |
| 44 return traits_type::eof(); | |
| 45 } | |
| 46 else if (__this->_M_in_putback_mode) { | |
| 47 __this->_M_exit_putback_mode(); | |
| 48 if (__this->gptr() != __this->egptr()) { | |
| 49 int_type __c = traits_type::to_int_type(*__this->gptr()); | |
| 50 return __c; | |
| 51 } | |
| 52 } | |
| 53 | |
| 54 // If it's a disk file, and if the internal and external character | |
| 55 // sequences are guaranteed to be identical, then try to use memory | |
| 56 // mapped I/O. Otherwise, revert to ordinary read. | |
| 57 if (__this->_M_base.__regular_file() | |
| 58 && __this->_M_always_noconv | |
| 59 && __this->_M_base._M_in_binary_mode()) { | |
| 60 // If we've mmapped part of the file already, then unmap it. | |
| 61 if (__this->_M_mmap_base) | |
| 62 __this->_M_base._M_unmap(__this->_M_mmap_base, __this->_M_mmap_len); | |
| 63 | |
| 64 // Determine the position where we start mapping. It has to be | |
| 65 // a multiple of the page size. | |
| 66 streamoff __cur = __this->_M_base._M_seek(0, ios_base::cur); | |
| 67 streamoff __size = __this->_M_base._M_file_size(); | |
| 68 if (__size > 0 && __cur >= 0 && __cur < __size) { | |
| 69 streamoff __offset = (__cur / __this->_M_base.__page_size()) * __this->_M_base.__page_size(); | |
| 70 streamoff __remainder = __cur - __offset; | |
| 71 | |
| 72 __this->_M_mmap_len = __size - __offset; | |
| 73 | |
| 74 if (__this->_M_mmap_len > MMAP_CHUNK) | |
| 75 __this->_M_mmap_len = MMAP_CHUNK; | |
| 76 | |
| 77 if ((__this->_M_mmap_base = __this->_M_base._M_mmap(__offset, __this->_M_mmap_len)) != 0) { | |
| 78 __this->setg(__STATIC_CAST(char*, __this->_M_mmap_base), | |
| 79 __STATIC_CAST(char*, __this->_M_mmap_base) + __STATIC_CAST(ptrdiff_t, __remainder), | |
| 80 __STATIC_CAST(char*, __this->_M_mmap_base) + __STATIC_CAST(ptrdiff_t, __this->_M_mmap_len)); | |
| 81 return traits_type::to_int_type(*__this->gptr()); | |
| 82 } | |
| 83 else | |
| 84 __this->_M_mmap_len = 0; | |
| 85 } | |
| 86 else { | |
| 87 __this->_M_mmap_base = 0; | |
| 88 __this->_M_mmap_len = 0; | |
| 89 } | |
| 90 } | |
| 91 | |
| 92 return __this->_M_underflow_aux(); | |
| 93 } | |
| 94 | |
| 95 //---------------------------------------------------------------------- | |
| 96 // Force instantiation of filebuf and fstream classes. | |
| 97 #if !defined(_STLP_NO_FORCE_INSTANTIATE) | |
| 98 | |
| 99 template class basic_filebuf<char, char_traits<char> >; | |
| 100 template class basic_ifstream<char, char_traits<char> >; | |
| 101 template class basic_ofstream<char, char_traits<char> >; | |
| 102 template class basic_fstream<char, char_traits<char> >; | |
| 103 | |
| 104 # if !defined (_STLP_NO_WCHAR_T) | |
| 105 template class _Underflow<wchar_t, char_traits<wchar_t> >; | |
| 106 template class basic_filebuf<wchar_t, char_traits<wchar_t> >; | |
| 107 template class basic_ifstream<wchar_t, char_traits<wchar_t> >; | |
| 108 template class basic_ofstream<wchar_t, char_traits<wchar_t> >; | |
| 109 template class basic_fstream<wchar_t, char_traits<wchar_t> >; | |
| 110 # endif /* _STLP_NO_WCHAR_T */ | |
| 111 | |
| 112 #endif | |
| 113 | |
| 114 _STLP_END_NAMESPACE |
