1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/epoc32/include/tools/stlport/stl/_fstream.c Wed Mar 31 12:33:34 2010 +0100
1.3 @@ -0,0 +1,737 @@
1.4 +/*
1.5 + * Copyright (c) 1996,1997
1.6 + * Silicon Graphics Computer Systems, Inc.
1.7 + *
1.8 + * Copyright (c) 1999
1.9 + * Boris Fomitchev
1.10 + *
1.11 + * This material is provided "as is", with absolutely no warranty expressed
1.12 + * or implied. Any use is at your own risk.
1.13 + *
1.14 + * Permission to use or copy this software for any purpose is hereby granted
1.15 + * without fee, provided the above notices are retained on all copies.
1.16 + * Permission to modify the code and to distribute modified code is granted,
1.17 + * provided the above notices are retained, and a notice that the code was
1.18 + * modified is included with the above copyright notice.
1.19 + *
1.20 + */
1.21 +#ifndef _STLP_FSTREAM_C
1.22 +#define _STLP_FSTREAM_C
1.23 +
1.24 +#ifndef _STLP_INTERNAL_FSTREAM_H
1.25 +# include <stl/_fstream.h>
1.26 +#endif
1.27 +
1.28 +#ifndef _STLP_INTERNAL_LIMITS
1.29 +# include <stl/_limits.h>
1.30 +#endif
1.31 +
1.32 +_STLP_BEGIN_NAMESPACE
1.33 +
1.34 +# if defined ( _STLP_NESTED_TYPE_PARAM_BUG )
1.35 +// no wchar_t is supported for this mode
1.36 +# define __BF_int_type__ int
1.37 +# define __BF_pos_type__ streampos
1.38 +# define __BF_off_type__ streamoff
1.39 +# else
1.40 +# define __BF_int_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_filebuf<_CharT, _Traits>::int_type
1.41 +# define __BF_pos_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_filebuf<_CharT, _Traits>::pos_type
1.42 +# define __BF_off_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_filebuf<_CharT, _Traits>::off_type
1.43 +# endif
1.44 +
1.45 +
1.46 +//----------------------------------------------------------------------
1.47 +// Public basic_filebuf<> member functions
1.48 +
1.49 +template <class _CharT, class _Traits>
1.50 +basic_filebuf<_CharT, _Traits>::basic_filebuf()
1.51 + : basic_streambuf<_CharT, _Traits>(), _M_base(),
1.52 + _M_constant_width(false), _M_always_noconv(false),
1.53 + _M_int_buf_dynamic(false),
1.54 + _M_in_input_mode(false), _M_in_output_mode(false),
1.55 + _M_in_error_mode(false), _M_in_putback_mode(false),
1.56 + _M_int_buf(0), _M_int_buf_EOS(0),
1.57 + _M_ext_buf(0), _M_ext_buf_EOS(0),
1.58 + _M_ext_buf_converted(0), _M_ext_buf_end(0),
1.59 + _M_state(_STLP_DEFAULT_CONSTRUCTED(_State_type)),
1.60 + _M_end_state(_STLP_DEFAULT_CONSTRUCTED(_State_type)),
1.61 + _M_mmap_base(0), _M_mmap_len(0),
1.62 + _M_saved_eback(0), _M_saved_gptr(0), _M_saved_egptr(0),
1.63 + _M_codecvt(0),
1.64 + _M_width(1), _M_max_width(1)
1.65 +{
1.66 + this->_M_setup_codecvt(locale(), false);
1.67 +}
1.68 +
1.69 +template <class _CharT, class _Traits>
1.70 +basic_filebuf<_CharT, _Traits>::~basic_filebuf() {
1.71 + this->close();
1.72 + _M_deallocate_buffers();
1.73 +}
1.74 +
1.75 +
1.76 +template <class _CharT, class _Traits>
1.77 +_STLP_TYPENAME_ON_RETURN_TYPE basic_filebuf<_CharT, _Traits>::int_type
1.78 +basic_filebuf<_CharT, _Traits>::underflow() {
1.79 + return _Underflow<_CharT, _Traits>::_M_doit(this);
1.80 +}
1.81 +
1.82 +template <class _CharT, class _Traits>
1.83 +basic_filebuf<_CharT, _Traits>*
1.84 +basic_filebuf<_CharT, _Traits>::close() {
1.85 + bool __ok = this->is_open();
1.86 +
1.87 + if (_M_in_output_mode) {
1.88 + __ok = __ok && !_Traits::eq_int_type(this->overflow(traits_type::eof()),
1.89 + traits_type::eof());
1.90 + __ok == __ok && this->_M_unshift();
1.91 + }
1.92 + else if (_M_in_input_mode)
1.93 + this->_M_exit_input_mode();
1.94 +
1.95 + // Note order of arguments. We close the file even if __ok is false.
1.96 + __ok = _M_base._M_close() && __ok;
1.97 +
1.98 + // Restore the initial state, except that we don't deallocate the buffer
1.99 + // or mess with the cached codecvt information.
1.100 + _M_state = _M_end_state = _State_type();
1.101 + _M_ext_buf_converted = _M_ext_buf_end = 0;
1.102 +
1.103 + _M_mmap_base = 0;
1.104 + _M_mmap_len = 0;
1.105 +
1.106 + this->setg(0, 0, 0);
1.107 + this->setp(0, 0);
1.108 +
1.109 + _M_saved_eback = _M_saved_gptr = _M_saved_egptr = 0;
1.110 +
1.111 + _M_in_input_mode = _M_in_output_mode = _M_in_error_mode = _M_in_putback_mode
1.112 + = false;
1.113 +
1.114 + return __ok ? this : 0;
1.115 +}
1.116 +
1.117 +// This member function is called whenever we exit input mode.
1.118 +// It unmaps the memory-mapped file, if any, and sets
1.119 +// _M_in_input_mode to false.
1.120 +template <class _CharT, class _Traits>
1.121 +void basic_filebuf<_CharT, _Traits>::_M_exit_input_mode() {
1.122 + if (_M_mmap_base != 0)
1.123 + _M_base._M_unmap(_M_mmap_base, _M_mmap_len);
1.124 + _M_in_input_mode = false;
1.125 + _M_mmap_base = 0;
1.126 +}
1.127 +
1.128 +
1.129 +//----------------------------------------------------------------------
1.130 +// basic_filebuf<> overridden protected virtual member functions
1.131 +
1.132 +template <class _CharT, class _Traits>
1.133 +streamsize basic_filebuf<_CharT, _Traits>::showmanyc() {
1.134 + // Is there any possibility that reads can succeed?
1.135 + if (!this->is_open() || _M_in_output_mode || _M_in_error_mode)
1.136 + return -1;
1.137 + else if (_M_in_putback_mode)
1.138 + return this->egptr() - this->gptr();
1.139 + else if (_M_constant_width) {
1.140 + streamoff __pos = _M_base._M_seek(0, ios_base::cur);
1.141 + streamoff __size = _M_base._M_file_size();
1.142 + return __pos >= 0 && __size > __pos ? __size - __pos : 0;
1.143 + }
1.144 + else
1.145 + return 0;
1.146 +}
1.147 +
1.148 +
1.149 +// Make a putback position available, if necessary, by switching to a
1.150 +// special internal buffer used only for putback. The buffer is
1.151 +// [_M_pback_buf, _M_pback_buf + _S_pback_buf_size), but the base
1.152 +// class only sees a piece of it at a time. (We want to make sure
1.153 +// that we don't try to read a character that hasn't been initialized.)
1.154 +// The end of the putback buffer is always _M_pback_buf + _S_pback_buf_size,
1.155 +// but the beginning is usually not _M_pback_buf.
1.156 +template <class _CharT, class _Traits>
1.157 +__BF_int_type__
1.158 +basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c) {
1.159 + const int_type __eof = traits_type::eof();
1.160 +
1.161 + // If we aren't already in input mode, pushback is impossible.
1.162 + if (!_M_in_input_mode)
1.163 + return __eof;
1.164 +
1.165 + // We can use the ordinary get buffer if there's enough space, and
1.166 + // if it's a buffer that we're allowed to write to.
1.167 + if (this->gptr() != this->eback() &&
1.168 + (traits_type::eq_int_type(__c, __eof) ||
1.169 + traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]) ||
1.170 + !_M_mmap_base)) {
1.171 + this->gbump(-1);
1.172 + if (traits_type::eq_int_type(__c, __eof) ||
1.173 + traits_type::eq(traits_type::to_char_type(__c), *this->gptr()))
1.174 + return traits_type::to_int_type(*this->gptr());
1.175 + }
1.176 + else if (!traits_type::eq_int_type(__c, __eof)) {
1.177 + // Are we in the putback buffer already?
1.178 + _CharT* __pback_end = _M_pback_buf + __STATIC_CAST(int,_S_pback_buf_size);
1.179 + if (_M_in_putback_mode) {
1.180 + // Do we have more room in the putback buffer?
1.181 + if (this->eback() != _M_pback_buf)
1.182 + this->setg(this->egptr() - 1, this->egptr() - 1, __pback_end);
1.183 + else
1.184 + return __eof; // No more room in the buffer, so fail.
1.185 + }
1.186 + else { // We're not yet in the putback buffer.
1.187 + _M_saved_eback = this->eback();
1.188 + _M_saved_gptr = this->gptr();
1.189 + _M_saved_egptr = this->egptr();
1.190 + this->setg(__pback_end - 1, __pback_end - 1, __pback_end);
1.191 + _M_in_putback_mode = true;
1.192 + }
1.193 + }
1.194 + else
1.195 + return __eof;
1.196 +
1.197 + // We have made a putback position available. Assign to it, and return.
1.198 + *this->gptr() = traits_type::to_char_type(__c);
1.199 + return __c;
1.200 +}
1.201 +
1.202 +// This member function flushes the put area, and also outputs the
1.203 +// character __c (unless __c is eof). Invariant: we always leave room
1.204 +// in the internal buffer for one character more than the base class knows
1.205 +// about. We see the internal buffer as [_M_int_buf, _M_int_buf_EOS), but
1.206 +// the base class only sees [_M_int_buf, _M_int_buf_EOS - 1).
1.207 +template <class _CharT, class _Traits>
1.208 +__BF_int_type__
1.209 +basic_filebuf<_CharT, _Traits>::overflow(int_type __c) {
1.210 + // Switch to output mode, if necessary.
1.211 + if (!_M_in_output_mode)
1.212 + if (!_M_switch_to_output_mode())
1.213 + return traits_type::eof();
1.214 +
1.215 + _CharT* __ibegin = this->_M_int_buf;
1.216 + _CharT* __iend = this->pptr();
1.217 + this->setp(_M_int_buf, _M_int_buf_EOS - 1);
1.218 +
1.219 + // Put __c at the end of the internal buffer.
1.220 + if (!traits_type::eq_int_type(__c, traits_type::eof()))
1.221 + *__iend++ = _Traits::to_char_type(__c);
1.222 +
1.223 + // For variable-width encodings, output may take more than one pass.
1.224 + while (__ibegin != __iend) {
1.225 + const _CharT* __inext = __ibegin;
1.226 + char* __enext = _M_ext_buf;
1.227 + typename _Codecvt::result __status
1.228 + = _M_codecvt->out(_M_state, __ibegin, __iend, __inext,
1.229 + _M_ext_buf, _M_ext_buf_EOS, __enext);
1.230 + if (__status == _Codecvt::noconv) {
1.231 + return _Noconv_output<_Traits>::_M_doit(this, __ibegin, __iend)
1.232 + ? traits_type::not_eof(__c)
1.233 + : _M_output_error();
1.234 + }
1.235 +
1.236 + // For a constant-width encoding we know that the external buffer
1.237 + // is large enough, so failure to consume the entire internal buffer
1.238 + // or to produce the correct number of external characters, is an error.
1.239 + // For a variable-width encoding, however, we require only that we
1.240 + // consume at least one internal character
1.241 + else if (__status != _Codecvt::error &&
1.242 + (((__inext == __iend) &&
1.243 + (__enext - _M_ext_buf == _M_width * (__iend - __ibegin))) ||
1.244 + (!_M_constant_width && __inext != __ibegin))) {
1.245 + // We successfully converted part or all of the internal buffer.
1.246 + ptrdiff_t __n = __enext - _M_ext_buf;
1.247 + if (_M_write(_M_ext_buf, __n))
1.248 + __ibegin += __inext - __ibegin;
1.249 + else
1.250 + return _M_output_error();
1.251 + }
1.252 + else
1.253 + return _M_output_error();
1.254 + }
1.255 +
1.256 + return traits_type::not_eof(__c);
1.257 +}
1.258 +
1.259 +// This member function must be called before any I/O has been
1.260 +// performed on the stream, otherwise it has no effect.
1.261 +//
1.262 +// __buf == 0 && __n == 0 means to make this stream unbuffered.
1.263 +// __buf != 0 && __n > 0 means to use __buf as the stream's internal
1.264 +// buffer, rather than the buffer that would otherwise be allocated
1.265 +// automatically. __buf must be a pointer to an array of _CharT whose
1.266 +// size is at least __n.
1.267 +template <class _CharT, class _Traits>
1.268 +basic_streambuf<_CharT, _Traits>*
1.269 +basic_filebuf<_CharT, _Traits>::setbuf(_CharT* __buf, streamsize __n) {
1.270 + if (!_M_in_input_mode &&! _M_in_output_mode && !_M_in_error_mode &&
1.271 + _M_int_buf == 0) {
1.272 + if (__buf == 0 && __n == 0)
1.273 + _M_allocate_buffers(0, 1);
1.274 + else if (__buf != 0 && __n > 0)
1.275 + _M_allocate_buffers(__buf, __n);
1.276 + }
1.277 + return this;
1.278 +}
1.279 +
1.280 +template <class _CharT, class _Traits>
1.281 +__BF_pos_type__
1.282 +basic_filebuf<_CharT, _Traits>::seekoff(off_type __off,
1.283 + ios_base::seekdir __whence,
1.284 + ios_base::openmode /* dummy */) {
1.285 + if (this->is_open() &&
1.286 + (__off == 0 || (_M_constant_width && this->_M_base._M_in_binary_mode()))) {
1.287 +
1.288 + if (!_M_seek_init(__off != 0 || __whence != ios_base::cur))
1.289 + return pos_type(-1);
1.290 +
1.291 + // Seek to beginning or end, regardless of whether we're in input mode.
1.292 + if (__whence == ios_base::beg || __whence == ios_base::end)
1.293 + return _M_seek_return(_M_base._M_seek(_M_width * __off, __whence),
1.294 + _State_type());
1.295 +
1.296 + // Seek relative to current position. Complicated if we're in input mode.
1.297 + else if (__whence == ios_base::cur) {
1.298 + if (!_M_in_input_mode)
1.299 + return _M_seek_return(_M_base._M_seek(_M_width * __off, __whence),
1.300 + _State_type());
1.301 + else if (_M_mmap_base != 0) {
1.302 + // __off is relative to gptr(). We need to do a bit of arithmetic
1.303 + // to get an offset relative to the external file pointer.
1.304 + streamoff __adjust = _M_mmap_len - (this->gptr() - (_CharT*) _M_mmap_base);
1.305 +
1.306 + // if __off == 0, we do not need to exit input mode and to shift file pointer
1.307 + return __off == 0 ? pos_type(_M_base._M_seek(0, ios_base::cur) - __adjust)
1.308 + : _M_seek_return(_M_base._M_seek(__off - __adjust, ios_base::cur), _State_type());
1.309 + }
1.310 + else if (_M_constant_width) { // Get or set the position.
1.311 + streamoff __iadj = _M_width * (this->gptr() - this->eback());
1.312 +
1.313 + // Compensate for offset relative to gptr versus offset relative
1.314 + // to external pointer. For a text-oriented stream, where the
1.315 + // compensation is more than just pointer arithmetic, we may get
1.316 + // but not set the current position.
1.317 +
1.318 + if (__iadj <= _M_ext_buf_end - _M_ext_buf) {
1.319 + streamoff __eadj = _M_base._M_get_offset(_M_ext_buf + __STATIC_CAST(ptrdiff_t, __iadj), _M_ext_buf_end);
1.320 +
1.321 + return __off == 0 ? pos_type(_M_base._M_seek(0, ios_base::cur) - __eadj)
1.322 + : _M_seek_return(_M_base._M_seek(__off - __eadj, ios_base::cur), _State_type());
1.323 + }
1.324 + } else { // Get the position. Encoding is var width.
1.325 + // Get position in internal buffer.
1.326 + ptrdiff_t __ipos = this->gptr() - this->eback();
1.327 +
1.328 + // Get corresponding position in external buffer.
1.329 + _State_type __state = _M_state;
1.330 + int __epos = _M_codecvt->length(__state, _M_ext_buf, _M_ext_buf_end,
1.331 + __ipos);
1.332 +
1.333 + if (__epos >= 0) {
1.334 + // Sanity check (expensive): make sure __epos is the right answer.
1.335 + _State_type __tmp_state = _M_state;
1.336 + _Filebuf_Tmp_Buf<_CharT> __buf(__ipos);
1.337 + _CharT* __ibegin = __buf._M_ptr;
1.338 + _CharT* __inext = __ibegin;
1.339 +
1.340 + const char* __dummy;
1.341 + typename _Codecvt::result __status
1.342 + = _M_codecvt->in(__tmp_state,
1.343 + _M_ext_buf, _M_ext_buf + __epos, __dummy,
1.344 + __ibegin, __ibegin + __ipos, __inext);
1.345 + if (__status != _Codecvt::error &&
1.346 + (__status == _Codecvt::noconv ||
1.347 + (__inext == __ibegin + __ipos &&
1.348 + equal(this->eback(), this->gptr(), __ibegin, _STLP_PRIV _Eq_traits<traits_type>())))) {
1.349 + // Get the current position (at the end of the external buffer),
1.350 + // then adjust it. Again, it might be a text-oriented stream.
1.351 + streamoff __cur = _M_base._M_seek(0, ios_base::cur);
1.352 + streamoff __adj =
1.353 + _M_base._M_get_offset(_M_ext_buf, _M_ext_buf + __epos) -
1.354 + _M_base._M_get_offset(_M_ext_buf, _M_ext_buf_end);
1.355 + if (__cur != -1 && __cur + __adj >= 0)
1.356 + return __off == 0 ? pos_type(__cur + __adj)
1.357 + : _M_seek_return(__cur + __adj, __state);
1.358 + //return _M_seek_return(__cur + __adj, __state);
1.359 + }
1.360 + // We failed the sanity check here.
1.361 + }
1.362 + }
1.363 + }
1.364 + // Unrecognized value for __whence here.
1.365 + }
1.366 +
1.367 + return pos_type(-1);
1.368 +}
1.369 +
1.370 +
1.371 +template <class _CharT, class _Traits>
1.372 +__BF_pos_type__
1.373 +basic_filebuf<_CharT, _Traits>::seekpos(pos_type __pos,
1.374 + ios_base::openmode /* dummy */) {
1.375 + if (this->is_open()) {
1.376 + if (!_M_seek_init(true))
1.377 + return pos_type(-1);
1.378 +
1.379 + streamoff __off = off_type(__pos);
1.380 + if (__off != -1 && _M_base._M_seek(__off, ios_base::beg) != -1) {
1.381 + _M_state = __pos.state();
1.382 + return _M_seek_return(__off, __pos.state());
1.383 + }
1.384 + }
1.385 +
1.386 + return pos_type(-1);
1.387 +}
1.388 +
1.389 +
1.390 +template <class _CharT, class _Traits>
1.391 +int basic_filebuf<_CharT, _Traits>::sync() {
1.392 + if (_M_in_output_mode)
1.393 + return traits_type::eq_int_type(this->overflow(traits_type::eof()),
1.394 + traits_type::eof()) ? -1 : 0;
1.395 + return 0;
1.396 +}
1.397 +
1.398 +
1.399 +// Change the filebuf's locale. This member function has no effect
1.400 +// unless it is called before any I/O is performed on the stream.
1.401 +template <class _CharT, class _Traits>
1.402 +void basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc) {
1.403 + if (!_M_in_input_mode && !_M_in_output_mode && !_M_in_error_mode) {
1.404 + this->_M_setup_codecvt(__loc);
1.405 + }
1.406 +}
1.407 +
1.408 +//----------------------------------------------------------------------
1.409 +// basic_filebuf<> helper functions.
1.410 +
1.411 +//----------------------------------------
1.412 +// Helper functions for switching between modes.
1.413 +
1.414 +// This member function is called if we're performing the first I/O
1.415 +// operation on a filebuf, or if we're performing an input operation
1.416 +// immediately after a seek.
1.417 +template <class _CharT, class _Traits>
1.418 +bool basic_filebuf<_CharT, _Traits>::_M_switch_to_input_mode() {
1.419 + if (this->is_open() && (((int)_M_base.__o_mode() & (int)ios_base::in) != 0)
1.420 + && (_M_in_output_mode == 0) && (_M_in_error_mode == 0)) {
1.421 + if (!_M_int_buf && !_M_allocate_buffers())
1.422 + return false;
1.423 +
1.424 + _M_ext_buf_converted = _M_ext_buf;
1.425 + _M_ext_buf_end = _M_ext_buf;
1.426 +
1.427 + _M_end_state = _M_state;
1.428 +
1.429 + _M_in_input_mode = true;
1.430 + return true;
1.431 + }
1.432 +
1.433 + return false;
1.434 +}
1.435 +
1.436 +
1.437 +// This member function is called if we're performing the first I/O
1.438 +// operation on a filebuf, or if we're performing an output operation
1.439 +// immediately after a seek.
1.440 +template <class _CharT, class _Traits>
1.441 +bool basic_filebuf<_CharT, _Traits>::_M_switch_to_output_mode() {
1.442 + if (this->is_open() && (_M_base.__o_mode() & (int)ios_base::out) &&
1.443 + _M_in_input_mode == 0 && _M_in_error_mode == 0) {
1.444 +
1.445 + if (!_M_int_buf && !_M_allocate_buffers())
1.446 + return false;
1.447 +
1.448 + // In append mode, every write does an implicit seek to the end
1.449 + // of the file. Whenever leaving output mode, the end of file
1.450 + // get put in the initial shift state.
1.451 + if (_M_base.__o_mode() & ios_base::app)
1.452 + _M_state = _State_type();
1.453 +
1.454 + this->setp(_M_int_buf, _M_int_buf_EOS - 1);
1.455 + _M_in_output_mode = true;
1.456 + return true;
1.457 + }
1.458 +
1.459 + return false;
1.460 +}
1.461 +
1.462 +
1.463 +//----------------------------------------
1.464 +// Helper functions for input
1.465 +
1.466 +// This member function is called if there is an error during input.
1.467 +// It puts the filebuf in error mode, clear the get area buffer, and
1.468 +// returns eof.
1.469 +// returns eof. Error mode is sticky; it is cleared only by close or
1.470 +// seek.
1.471 +
1.472 +template <class _CharT, class _Traits>
1.473 +__BF_int_type__
1.474 +basic_filebuf<_CharT, _Traits>::_M_input_error() {
1.475 + this->_M_exit_input_mode();
1.476 + _M_in_output_mode = false;
1.477 + _M_in_error_mode = true;
1.478 + this->setg(0, 0, 0);
1.479 + return traits_type::eof();
1.480 +}
1.481 +
1.482 +template <class _CharT, class _Traits>
1.483 +__BF_int_type__
1.484 +basic_filebuf<_CharT, _Traits>::_M_underflow_aux() {
1.485 + // We have the state and file position from the end of the internal
1.486 + // buffer. This round, they become the beginning of the internal buffer.
1.487 + _M_state = _M_end_state;
1.488 +
1.489 + // Fill the external buffer. Start with any leftover characters that
1.490 + // didn't get converted last time.
1.491 + if (_M_ext_buf_end > _M_ext_buf_converted)
1.492 +
1.493 + _M_ext_buf_end = copy(_M_ext_buf_converted, _M_ext_buf_end, _M_ext_buf);
1.494 + // boris : copy_backward did not work
1.495 + //_M_ext_buf_end = copy_backward(_M_ext_buf_converted, _M_ext_buf_end,
1.496 + //_M_ext_buf+ (_M_ext_buf_end - _M_ext_buf_converted));
1.497 + else
1.498 + _M_ext_buf_end = _M_ext_buf;
1.499 +
1.500 + // Now fill the external buffer with characters from the file. This is
1.501 + // a loop because occasionally we don't get enough external characters
1.502 + // to make progress.
1.503 + for (;;) {
1.504 + ptrdiff_t __n = _M_base._M_read(_M_ext_buf_end, _M_ext_buf_EOS - _M_ext_buf_end);
1.505 +
1.506 + // Don't enter error mode for a failed read. Error mode is sticky,
1.507 + // and we might succeed if we try again.
1.508 + if (__n <= 0)
1.509 + return traits_type::eof();
1.510 +
1.511 + // Convert the external buffer to internal characters.
1.512 + _M_ext_buf_end += __n;
1.513 + const char* __enext;
1.514 + _CharT* __inext;
1.515 +
1.516 + typename _Codecvt::result __status
1.517 + = _M_codecvt->in(_M_end_state,
1.518 + _M_ext_buf, _M_ext_buf_end, __enext,
1.519 + _M_int_buf, _M_int_buf_EOS, __inext);
1.520 +
1.521 + // Error conditions: (1) Return value of error. (2) Producing internal
1.522 + // characters without consuming external characters. (3) In fixed-width
1.523 + // encodings, producing an internal sequence whose length is inconsistent
1.524 + // with that of the internal sequence. (4) Failure to produce any
1.525 + // characters if we have enough characters in the external buffer, where
1.526 + // "enough" means the largest possible width of a single character.
1.527 + if (__status == _Codecvt::noconv)
1.528 + return _Noconv_input<_Traits>::_M_doit(this);
1.529 + else if (__status == _Codecvt::error ||
1.530 + (__inext != _M_int_buf && __enext == _M_ext_buf) ||
1.531 + (_M_constant_width &&
1.532 + // __inext - _M_int_buf != _M_width * (__enext - _M_ext_buf)) ||
1.533 + (__inext - _M_int_buf) * _M_width != (__enext - _M_ext_buf)) ||
1.534 + (__inext == _M_int_buf && __enext - _M_ext_buf >= _M_max_width))
1.535 + return _M_input_error();
1.536 + else if (__inext != _M_int_buf) {
1.537 + _M_ext_buf_converted = _M_ext_buf + (__enext - _M_ext_buf);
1.538 + this->setg(_M_int_buf, _M_int_buf, __inext);
1.539 + return traits_type::to_int_type(*_M_int_buf);
1.540 + }
1.541 + // We need to go around the loop again to get more external characters.
1.542 + }
1.543 +}
1.544 +
1.545 +//----------------------------------------
1.546 +// Helper functions for output
1.547 +
1.548 +// This member function is called if there is an error during output.
1.549 +// It puts the filebuf in error mode, clear the put area buffer, and
1.550 +// returns eof. Error mode is sticky; it is cleared only by close or
1.551 +// seek.
1.552 +template <class _CharT, class _Traits>
1.553 +__BF_int_type__
1.554 +basic_filebuf<_CharT, _Traits>::_M_output_error() {
1.555 + _M_in_output_mode = false;
1.556 + _M_in_input_mode = false;
1.557 + _M_in_error_mode = true;
1.558 + this->setp(0, 0);
1.559 + return traits_type::eof();
1.560 +}
1.561 +
1.562 +
1.563 +// Write whatever sequence of characters is necessary to get back to
1.564 +// the initial shift state. This function overwrites the external
1.565 +// buffer, changes the external file position, and changes the state.
1.566 +// Precondition: the internal buffer is empty.
1.567 +template <class _CharT, class _Traits>
1.568 +bool basic_filebuf<_CharT, _Traits>::_M_unshift() {
1.569 + if (_M_in_output_mode && !_M_constant_width) {
1.570 + typename _Codecvt::result __status;
1.571 + do {
1.572 + char* __enext = _M_ext_buf;
1.573 + __status = _M_codecvt->unshift(_M_state,
1.574 + _M_ext_buf, _M_ext_buf_EOS, __enext);
1.575 + if (__status == _Codecvt::noconv ||
1.576 + (__enext == _M_ext_buf && __status == _Codecvt::ok))
1.577 + return true;
1.578 + else if (__status == _Codecvt::error)
1.579 + return false;
1.580 + else if (!_M_write(_M_ext_buf, __enext - _M_ext_buf))
1.581 + return false;
1.582 + } while (__status == _Codecvt::partial);
1.583 + }
1.584 +
1.585 + return true;
1.586 +}
1.587 +
1.588 +
1.589 +//----------------------------------------
1.590 +// Helper functions for buffer allocation and deallocation
1.591 +
1.592 +// This member function is called when we're initializing a filebuf's
1.593 +// internal and external buffers. The argument is the size of the
1.594 +// internal buffer; the external buffer is sized using the character
1.595 +// width in the current encoding. Preconditions: the buffers are currently
1.596 +// null. __n >= 1. __buf is either a null pointer or a pointer to an
1.597 +// array show size is at least __n.
1.598 +
1.599 +// We need __n >= 1 for two different reasons. For input, the base
1.600 +// class always needs a buffer because of the semantics of underflow().
1.601 +// For output, we want to have an internal buffer that's larger by one
1.602 +// element than the buffer that the base class knows about. (See
1.603 +// basic_filebuf<>::overflow() for the reason.)
1.604 +template <class _CharT, class _Traits>
1.605 +bool basic_filebuf<_CharT, _Traits>::_M_allocate_buffers(_CharT* __buf, streamsize __n) {
1.606 + //The major hypothesis in the following implementation is that size_t is unsigned.
1.607 + //We also need streamsize byte representation to be larger or equal to the int
1.608 + //representation to correctly store the encoding information.
1.609 + _STLP_STATIC_ASSERT(!numeric_limits<size_t>::is_signed &&
1.610 + sizeof(streamsize) >= sizeof(int))
1.611 +
1.612 + if (__buf == 0) {
1.613 + streamsize __bufsize = __n * sizeof(_CharT);
1.614 + //We first check that the streamsize representation can't overflow a size_t one.
1.615 + //If it can, we check that __bufsize is not higher than the size_t max value.
1.616 + if ((sizeof(streamsize) > sizeof(size_t)) &&
1.617 + (__bufsize > __STATIC_CAST(streamsize, (numeric_limits<size_t>::max)())))
1.618 + return false;
1.619 + _M_int_buf = __STATIC_CAST(_CharT*, malloc(__STATIC_CAST(size_t, __bufsize)));
1.620 + if (!_M_int_buf)
1.621 + return false;
1.622 + _M_int_buf_dynamic = true;
1.623 + }
1.624 + else {
1.625 + _M_int_buf = __buf;
1.626 + _M_int_buf_dynamic = false;
1.627 + }
1.628 +
1.629 + streamsize __ebufsiz = (max)(__n * __STATIC_CAST(streamsize, _M_width),
1.630 + __STATIC_CAST(streamsize, _M_codecvt->max_length()));
1.631 + _M_ext_buf = 0;
1.632 + if ((sizeof(streamsize) < sizeof(size_t)) ||
1.633 + ((sizeof(streamsize) == sizeof(size_t)) && numeric_limits<streamsize>::is_signed) ||
1.634 + (__ebufsiz <= __STATIC_CAST(streamsize, (numeric_limits<size_t>::max)()))) {
1.635 + _M_ext_buf = __STATIC_CAST(char*, malloc(__STATIC_CAST(size_t, __ebufsiz)));
1.636 + }
1.637 +
1.638 + if (!_M_ext_buf) {
1.639 + _M_deallocate_buffers();
1.640 + return false;
1.641 + }
1.642 +
1.643 + _M_int_buf_EOS = _M_int_buf + __STATIC_CAST(ptrdiff_t, __n);
1.644 + _M_ext_buf_EOS = _M_ext_buf + __STATIC_CAST(ptrdiff_t, __ebufsiz);
1.645 + return true;
1.646 +}
1.647 +
1.648 +// Abbreviation for the most common case.
1.649 +template <class _CharT, class _Traits>
1.650 +bool basic_filebuf<_CharT, _Traits>::_M_allocate_buffers() {
1.651 + // Choose a buffer that's at least 4096 characters long and that's a
1.652 + // multiple of the page size.
1.653 + streamsize __default_bufsiz =
1.654 + ((_M_base.__page_size() + 4095UL) / _M_base.__page_size()) * _M_base.__page_size();
1.655 + return _M_allocate_buffers(0, __default_bufsiz);
1.656 +}
1.657 +
1.658 +template <class _CharT, class _Traits>
1.659 +void basic_filebuf<_CharT, _Traits>::_M_deallocate_buffers() {
1.660 + if (_M_int_buf_dynamic)
1.661 + free(_M_int_buf);
1.662 + free(_M_ext_buf);
1.663 + _M_int_buf = 0;
1.664 + _M_int_buf_EOS = 0;
1.665 + _M_ext_buf = 0;
1.666 + _M_ext_buf_EOS = 0;
1.667 +}
1.668 +
1.669 +
1.670 +//----------------------------------------
1.671 +// Helper functiosn for seek and imbue
1.672 +
1.673 +template <class _CharT, class _Traits>
1.674 +bool basic_filebuf<_CharT, _Traits>::_M_seek_init(bool __do_unshift) {
1.675 + // If we're in error mode, leave it.
1.676 + _M_in_error_mode = false;
1.677 +
1.678 + // Flush the output buffer if we're in output mode, and (conditionally)
1.679 + // emit an unshift sequence.
1.680 + if (_M_in_output_mode) {
1.681 + bool __ok = !traits_type::eq_int_type(this->overflow(traits_type::eof()),
1.682 + traits_type::eof());
1.683 + if (__do_unshift)
1.684 + __ok = __ok && this->_M_unshift();
1.685 + if (!__ok) {
1.686 + _M_in_output_mode = false;
1.687 + _M_in_error_mode = true;
1.688 + this->setp(0, 0);
1.689 + return false;
1.690 + }
1.691 + }
1.692 +
1.693 + // Discard putback characters, if any.
1.694 + if (_M_in_input_mode && _M_in_putback_mode)
1.695 + _M_exit_putback_mode();
1.696 +
1.697 + return true;
1.698 +}
1.699 +
1.700 +
1.701 +/* Change the filebuf's locale. This member function has no effect
1.702 + * unless it is called before any I/O is performed on the stream.
1.703 + * This function is called on construction and on an imbue call. In the
1.704 + * case of the construction the codecvt facet might be a custom one if
1.705 + * the basic_filebuf user has instanciate it with a custom char_traits.
1.706 + * The user will have to call imbue before any I/O operation.
1.707 + */
1.708 +template <class _CharT, class _Traits>
1.709 +void basic_filebuf<_CharT, _Traits>::_M_setup_codecvt(const locale& __loc, bool __on_imbue) {
1.710 + if (has_facet<_Codecvt>(__loc)) {
1.711 + _M_codecvt = &use_facet<_Codecvt>(__loc) ;
1.712 + int __encoding = _M_codecvt->encoding();
1.713 +
1.714 + _M_width = (max)(__encoding, 1);
1.715 + _M_max_width = _M_codecvt->max_length();
1.716 + _M_constant_width = __encoding > 0;
1.717 + _M_always_noconv = _M_codecvt->always_noconv();
1.718 + }
1.719 + else {
1.720 + _M_codecvt = 0;
1.721 + _M_width = _M_max_width = 1;
1.722 + _M_constant_width = _M_always_noconv = false;
1.723 + if (__on_imbue) {
1.724 + //This call will generate an exception reporting the problem.
1.725 + use_facet<_Codecvt>(__loc);
1.726 + }
1.727 + }
1.728 +}
1.729 +
1.730 +_STLP_END_NAMESPACE
1.731 +
1.732 +# undef __BF_int_type__
1.733 +# undef __BF_pos_type__
1.734 +# undef __BF_off_type__
1.735 +
1.736 +#endif /* _STLP_FSTREAM_C */
1.737 +
1.738 +// Local Variables:
1.739 +// mode:C++
1.740 +// End: