| 1 | // File based streams -*- C++ -*-
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| 2 |
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| 3 | // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
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| 4 | // Free Software Foundation, Inc.
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| 5 | //
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| 6 | // This file is part of the GNU ISO C++ Library. This library is free
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| 7 | // software; you can redistribute it and/or modify it under the
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| 8 | // terms of the GNU General Public License as published by the
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| 9 | // Free Software Foundation; either version 2, or (at your option)
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| 10 | // any later version.
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| 11 |
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| 12 | // This library is distributed in the hope that it will be useful,
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| 13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | // GNU General Public License for more details.
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| 16 |
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| 17 | // You should have received a copy of the GNU General Public License along
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| 18 | // with this library; see the file COPYING. If not, write to the Free
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| 19 | // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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| 20 | // USA.
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| 21 |
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| 22 | // As a special exception, you may use this file as part of a free software
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| 23 | // library without restriction. Specifically, if other files instantiate
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| 24 | // templates or use macros or inline functions from this file, or you compile
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| 25 | // this file and link it with other files to produce an executable, this
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| 26 | // file does not by itself cause the resulting executable to be covered by
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| 27 | // the GNU General Public License. This exception does not however
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| 28 | // invalidate any other reasons why the executable file might be covered by
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| 29 | // the GNU General Public License.
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| 30 |
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| 31 | //
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| 32 | // ISO C++ 14882: 27.8 File-based streams
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| 33 | //
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| 34 |
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| 35 | #include <fstream>
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| 36 |
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| 37 | namespace std
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| 38 | {
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| 39 | template<>
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| 40 | basic_filebuf<char>::int_type
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| 41 | basic_filebuf<char>::_M_underflow_common(bool __bump)
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| 42 | {
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| 43 | int_type __ret = traits_type::eof();
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| 44 | bool __testin = _M_mode & ios_base::in;
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| 45 | bool __testout = _M_mode & ios_base::out;
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| 46 |
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| 47 | if (__testin)
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| 48 | {
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| 49 | // Check for pback madness, and if so swich back to the
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| 50 | // normal buffers and jet outta here before expensive
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| 51 | // fileops happen...
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| 52 | if (_M_pback_init)
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| 53 | _M_pback_destroy();
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| 54 |
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| 55 | if (_M_in_cur && _M_in_cur < _M_in_end)
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| 56 | {
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| 57 | __ret = traits_type::to_int_type(*_M_in_cur);
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| 58 | if (__bump)
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| 59 | _M_in_cur_move(1);
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| 60 | return __ret;
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| 61 | }
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| 62 |
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| 63 | // Sync internal and external buffers.
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| 64 | // NB: __testget -> __testput as _M_buf_unified here.
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| 65 | bool __testget = _M_in_cur && _M_in_beg < _M_in_cur;
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| 66 | bool __testinit = _M_is_indeterminate();
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| 67 | if (__testget)
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| 68 | {
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| 69 | if (__testout)
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| 70 | _M_really_overflow();
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| 71 | else if (_M_in_cur != _M_filepos)
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| 72 | _M_file.seekoff(_M_in_cur - _M_filepos,
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| 73 | ios_base::cur, ios_base::in);
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| 74 | }
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| 75 |
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| 76 | if (__testinit || __testget)
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| 77 | {
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| 78 | streamsize __elen = 0;
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| 79 | streamsize __ilen = 0;
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| 80 | __elen = _M_file.xsgetn(reinterpret_cast<char*>(_M_in_beg),
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| 81 | _M_buf_size);
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| 82 | __ilen = __elen;
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| 83 |
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| 84 | if (0 < __ilen)
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| 85 | {
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| 86 | _M_set_determinate(__ilen);
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| 87 | if (__testout)
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| 88 | _M_out_cur = _M_in_cur;
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| 89 | __ret = traits_type::to_int_type(*_M_in_cur);
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| 90 | if (__bump)
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| 91 | _M_in_cur_move(1);
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| 92 | else if (_M_buf_size == 1)
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| 93 | {
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| 94 | // If we are synced with stdio, we have to unget the
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| 95 | // character we just read so that the file pointer
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| 96 | // doesn't move.
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| 97 | _M_file.sys_ungetc(traits_type::to_int_type(*_M_in_cur));
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| 98 | _M_set_indeterminate();
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| 99 | }
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| 100 | }
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| 101 | }
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| 102 | }
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| 103 | _M_last_overflowed = false;
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| 104 | return __ret;
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| 105 | }
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| 106 |
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| 107 | #ifdef _GLIBCPP_USE_WCHAR_T
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| 108 | template<>
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| 109 | basic_filebuf<wchar_t>::int_type
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| 110 | basic_filebuf<wchar_t>::_M_underflow_common(bool __bump)
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| 111 | {
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| 112 | int_type __ret = traits_type::eof();
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| 113 | bool __testin = _M_mode & ios_base::in;
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| 114 | bool __testout = _M_mode & ios_base::out;
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| 115 |
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| 116 | if (__testin)
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| 117 | {
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| 118 | // Check for pback madness, and if so swich back to the
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| 119 | // normal buffers and jet outta here before expensive
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| 120 | // fileops happen...
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| 121 | if (_M_pback_init)
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| 122 | _M_pback_destroy();
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| 123 |
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| 124 | if (_M_in_cur && _M_in_cur < _M_in_end)
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| 125 | {
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| 126 | __ret = traits_type::to_int_type(*_M_in_cur);
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| 127 | if (__bump)
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| 128 | _M_in_cur_move(1);
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| 129 | return __ret;
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| 130 | }
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| 131 |
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| 132 | // Sync internal and external buffers.
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| 133 | // NB: __testget -> __testput as _M_buf_unified here.
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| 134 | bool __testget = _M_in_cur && _M_in_beg < _M_in_cur;
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| 135 | bool __testinit = _M_is_indeterminate();
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| 136 | if (__testget)
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| 137 | {
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| 138 | if (__testout)
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| 139 | _M_really_overflow();
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| 140 | else if (_M_in_cur != _M_filepos)
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| 141 | _M_file.seekoff(_M_in_cur - _M_filepos,
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| 142 | ios_base::cur, ios_base::in);
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| 143 | }
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| 144 |
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| 145 | if (__testinit || __testget)
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| 146 | {
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| 147 | const locale __loc = this->getloc();
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| 148 | const __codecvt_type& __cvt = use_facet<__codecvt_type>(__loc);
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| 149 |
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| 150 | streamsize __elen = 0;
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| 151 | streamsize __ilen = 0;
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| 152 | if (__cvt.always_noconv())
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| 153 | {
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| 154 | __elen = _M_file.xsgetn(reinterpret_cast<char*>(_M_in_beg),
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| 155 | _M_buf_size);
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| 156 | __ilen = __elen;
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| 157 | }
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| 158 | else
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| 159 | {
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| 160 | char* __buf = static_cast<char*>(__builtin_alloca(_M_buf_size));
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| 161 | __elen = _M_file.xsgetn(__buf, _M_buf_size);
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| 162 |
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| 163 | const char* __eend;
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| 164 | char_type* __iend;
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| 165 | codecvt_base::result __r;
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| 166 | __r = __cvt.in(_M_state_cur, __buf,
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| 167 | __buf + __elen, __eend, _M_in_beg,
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| 168 | _M_in_beg + _M_buf_size, __iend);
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| 169 | if (__r == codecvt_base::ok)
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| 170 | __ilen = __iend - _M_in_beg;
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| 171 | else
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| 172 | {
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| 173 | // Unwind.
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| 174 | __ilen = 0;
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| 175 | _M_file.seekoff(-__elen, ios_base::cur, ios_base::in);
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| 176 | }
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| 177 | }
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| 178 |
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| 179 | if (0 < __ilen)
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| 180 | {
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| 181 | _M_set_determinate(__ilen);
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| 182 | if (__testout)
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| 183 | _M_out_cur = _M_in_cur;
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| 184 | __ret = traits_type::to_int_type(*_M_in_cur);
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| 185 | if (__bump)
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| 186 | _M_in_cur_move(1);
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| 187 | else if (_M_buf_size == 1)
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| 188 | {
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| 189 | // If we are synced with stdio, we have to unget the
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| 190 | // character we just read so that the file pointer
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| 191 | // doesn't move.
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| 192 | _M_file.sys_ungetc(traits_type::to_int_type(*_M_in_cur));
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| 193 | _M_set_indeterminate();
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| 194 | }
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| 195 | }
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| 196 | }
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| 197 | }
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| 198 | _M_last_overflowed = false;
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| 199 | return __ret;
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| 200 | }
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| 201 | #endif
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| 202 | } // namespace std
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