1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/epoc32/include/stdapis/stlport/stl/_fstream.c Wed Mar 31 12:33:34 2010 +0100
1.3 @@ -0,0 +1,891 @@
1.4 +/*
1.5 + * © Portions copyright (c) 2006-2007 Nokia Corporation. All rights reserved.
1.6 + *
1.7 + * Copyright (c) 1996,1997
1.8 + * Silicon Graphics Computer Systems, Inc.
1.9 + *
1.10 + * Copyright (c) 1999
1.11 + * Boris Fomitchev
1.12 + *
1.13 + * This material is provided "as is", with absolutely no warranty expressed
1.14 + * or implied. Any use is at your own risk.
1.15 + *
1.16 + * Permission to use or copy this software for any purpose is hereby granted
1.17 + * without fee, provided the above notices are retained on all copies.
1.18 + * Permission to modify the code and to distribute modified code is granted,
1.19 + * provided the above notices are retained, and a notice that the code was
1.20 + * modified is included with the above copyright notice.
1.21 + *
1.22 + */
1.23 +#ifndef _STLP_FSTREAM_C
1.24 +#define _STLP_FSTREAM_C
1.25 +
1.26 +# ifndef _STLP_INTERNAL_FSTREAM_H
1.27 +# include <stl/_fstream.h>
1.28 +# endif
1.29 +
1.30 +# if defined (_STLP_EXPOSE_STREAM_IMPLEMENTATION)
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());
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 +{
1.80 + return _Underflow<_CharT, _Traits>::_M_doit(this);
1.81 +}
1.82 +
1.83 +template <class _CharT, class _Traits>
1.84 +basic_filebuf<_CharT, _Traits>*
1.85 +basic_filebuf<_CharT, _Traits>::close()
1.86 +{
1.87 + bool __ok = this->is_open();
1.88 +
1.89 + if (_M_in_output_mode) {
1.90 + __ok = __ok && !_Traits::eq_int_type(this->overflow(traits_type::eof()),
1.91 + traits_type::eof());
1.92 + __ok == __ok && this->_M_unshift();
1.93 + }
1.94 + else if (_M_in_input_mode)
1.95 + this->_M_exit_input_mode();
1.96 +
1.97 + // Note order of arguments. We close the file even if __ok is false.
1.98 + __ok = _M_base._M_close() && __ok;
1.99 +
1.100 + // Restore the initial state, except that we don't deallocate the buffer
1.101 + // or mess with the cached codecvt information.
1.102 + _M_state = _M_end_state = _State_type();
1.103 + _M_ext_buf_converted = _M_ext_buf_end = 0;
1.104 +
1.105 + _M_mmap_base = 0;
1.106 + _M_mmap_len = 0;
1.107 +
1.108 +#ifdef __SYMBIAN32__
1.109 + if (__ok) {
1.110 +#endif // __SYMBIAN32__
1.111 + this->setg(0, 0, 0);
1.112 + this->setp(0, 0);
1.113 +#ifdef __SYMBIAN32__
1.114 + }
1.115 +#endif // __SYMBIAN32__
1.116 +
1.117 + _M_saved_eback = _M_saved_gptr = _M_saved_egptr = 0;
1.118 +
1.119 + _M_in_input_mode = _M_in_output_mode = _M_in_error_mode = _M_in_putback_mode
1.120 + = false;
1.121 +
1.122 + return __ok ? this : 0;
1.123 +}
1.124 +
1.125 +// This member function is called whenever we exit input mode.
1.126 +// It unmaps the memory-mapped file, if any, and sets
1.127 +// _M_in_input_mode to false.
1.128 +template <class _CharT, class _Traits>
1.129 +void basic_filebuf<_CharT, _Traits>::_M_exit_input_mode()
1.130 +{
1.131 + if (_M_mmap_base != 0)
1.132 + _M_base._M_unmap(_M_mmap_base, _M_mmap_len);
1.133 + _M_in_input_mode = false;
1.134 + _M_mmap_base = 0;
1.135 +}
1.136 +
1.137 +
1.138 +//----------------------------------------------------------------------
1.139 +// basic_filebuf<> overridden protected virtual member functions
1.140 +
1.141 +template <class _CharT, class _Traits>
1.142 +streamsize basic_filebuf<_CharT, _Traits>::showmanyc()
1.143 +{
1.144 + // Is there any possibility that reads can succeed?
1.145 +#ifdef __SYMBIAN32__
1.146 + if (!this->is_open() || !(_M_base.__o_mode() & (int)ios_base::in) || _M_in_error_mode)
1.147 +#else
1.148 + if (!this->is_open() || _M_in_output_mode || _M_in_error_mode)
1.149 +#endif
1.150 + return -1;
1.151 +
1.152 + else if (_M_in_putback_mode)
1.153 + return this->egptr() - this->gptr();
1.154 +
1.155 + else if (_M_constant_width) {
1.156 + streamoff __pos = _M_base._M_seek(0, ios_base::cur);
1.157 + streamoff __size = _M_base._M_file_size();
1.158 +#ifdef __SYMBIAN32__
1.159 + if(__size == 0)
1.160 + return 0;
1.161 +#endif
1.162 + return __pos >= 0 && __size > __pos ? __size - __pos : -1;
1.163 + }
1.164 +
1.165 + else
1.166 + return 0;
1.167 +}
1.168 +
1.169 +
1.170 +// Make a putback position available, if necessary, by switching to a
1.171 +// special internal buffer used only for putback. The buffer is
1.172 +// [_M_pback_buf, _M_pback_buf + _S_pback_buf_size), but the base
1.173 +// class only sees a piece of it at a time. (We want to make sure
1.174 +// that we don't try to read a character that hasn't been initialized.)
1.175 +// The end of the putback buffer is always _M_pback_buf + _S_pback_buf_size,
1.176 +// but the beginning is usually not _M_pback_buf.
1.177 +template <class _CharT, class _Traits>
1.178 +__BF_int_type__
1.179 +basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c)
1.180 +{
1.181 + const int_type __eof = traits_type::eof();
1.182 +
1.183 + // If we aren't already in input mode, pushback is impossible.
1.184 + if (!_M_in_input_mode)
1.185 + return __eof;
1.186 +
1.187 + // We can use the ordinary get buffer if there's enough space, and
1.188 + // if it's a buffer that we're allowed to write to.
1.189 + if (this->gptr() != this->eback() &&
1.190 + (traits_type::eq_int_type(__c, __eof) ||
1.191 + traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]) ||
1.192 + !_M_mmap_base)) {
1.193 + this->gbump(-1);
1.194 + if (traits_type::eq_int_type(__c, __eof) ||
1.195 + traits_type::eq(traits_type::to_char_type(__c), *this->gptr()))
1.196 + return traits_type::to_int_type(*this->gptr());
1.197 + }
1.198 + else if (!traits_type::eq_int_type(__c, __eof)) {
1.199 + // Are we in the putback buffer already?
1.200 + _CharT* __pback_end = _M_pback_buf + __STATIC_CAST(int,_S_pback_buf_size);
1.201 + if (_M_in_putback_mode) {
1.202 + // Do we have more room in the putback buffer?
1.203 + if (this->eback() != _M_pback_buf)
1.204 + this->setg(this->egptr() - 1, this->egptr() - 1, __pback_end);
1.205 + else
1.206 + return __eof; // No more room in the buffer, so fail.
1.207 + }
1.208 + else { // We're not yet in the putback buffer.
1.209 + _M_saved_eback = this->eback();
1.210 + _M_saved_gptr = this->gptr();
1.211 + _M_saved_egptr = this->egptr();
1.212 + this->setg(__pback_end - 1, __pback_end - 1, __pback_end);
1.213 + _M_in_putback_mode = true;
1.214 + }
1.215 + }
1.216 + else
1.217 + {
1.218 +#ifdef __SYMBIAN32__
1.219 + if (traits_type::eq_int_type(__c, __eof) )
1.220 + {
1.221 + if(_M_in_putback_mode)
1.222 + {
1.223 + _M_in_putback_mode = false;
1.224 + // we are at putback mode
1.225 + if(_M_saved_eback != _M_saved_gptr)
1.226 + {
1.227 + this->setg(_M_saved_eback, _M_saved_gptr - 1, _M_saved_egptr);
1.228 + return *this->gptr();
1.229 + }
1.230 + else
1.231 + this->setg(_M_saved_eback, _M_saved_gptr, _M_saved_egptr);
1.232 +
1.233 + }
1.234 + else
1.235 + {
1.236 + if(!this->eback())
1.237 + {
1.238 + streamoff __pos = _M_base._M_seek(0, ios_base::cur);
1.239 + streamoff __size = _M_base._M_file_size();
1.240 + if( __size > 0 && __pos > 0 && __pos == __size)
1.241 + __pos = _M_base._M_seek(__pos - 1, ios_base::beg);
1.242 + this->underflow();
1.243 + this->setg(this->eback(), this->gptr(), this->egptr());
1.244 + return *this->gptr();
1.245 + }
1.246 + else
1.247 + {
1.248 + this->setg(this->eback(), this->gptr() - 1, this->egptr());
1.249 + return *this->gptr();
1.250 + }
1.251 + }
1.252 + }
1.253 +#endif
1.254 + return __eof;
1.255 + }
1.256 + // We have made a putback position available. Assign to it, and return.
1.257 + *this->gptr() = traits_type::to_char_type(__c);
1.258 + return __c;
1.259 +}
1.260 +
1.261 +// This member function flushes the put area, and also outputs the
1.262 +// character __c (unless __c is eof). Invariant: we always leave room
1.263 +// in the internal buffer for one character more than the base class knows
1.264 +// about. We see the internal buffer as [_M_int_buf, _M_int_buf_EOS), but
1.265 +// the base class only sees [_M_int_buf, _M_int_buf_EOS - 1).
1.266 +template <class _CharT, class _Traits>
1.267 +__BF_int_type__
1.268 +basic_filebuf<_CharT, _Traits>::overflow(int_type __c)
1.269 +{
1.270 + // Switch to output mode, if necessary.
1.271 + bool putflag = false;
1.272 + if (!_M_in_output_mode)
1.273 + {
1.274 +#ifdef __SYMBIAN32__
1.275 + if(this->_M_int_buf)
1.276 + putflag = true;
1.277 +#endif
1.278 + if (!_M_switch_to_output_mode())
1.279 + return traits_type::eof();
1.280 + }
1.281 + _CharT* __ibegin = this->_M_int_buf;
1.282 + _CharT* __iend = this->pptr();
1.283 + this->setp(_M_int_buf, _M_int_buf_EOS - 1);
1.284 +
1.285 + // Put __c at the end of the internal buffer.
1.286 + if (!traits_type::eq_int_type(__c, traits_type::eof()))
1.287 + *__iend++ = __c;
1.288 +#ifdef __SYMBIAN32__
1.289 + int current_pos = this->gptr() - this->eback();
1.290 + streamoff __size = _M_base._M_file_size();
1.291 + if(current_pos > 0 && current_pos < __size && _M_base.__is_open())
1.292 + _M_base._M_seek(current_pos, ios_base::beg);
1.293 +#endif
1.294 +
1.295 + // For variable-width encodings, output may take more than one pass.
1.296 + while (__ibegin != __iend) {
1.297 + const _CharT* __inext = __ibegin;
1.298 + char* __enext = _M_ext_buf;
1.299 + typename _Codecvt::result __status
1.300 + = _M_codecvt->out(_M_state, __ibegin, __iend, __inext,
1.301 + _M_ext_buf, _M_ext_buf_EOS, __enext);
1.302 + if (__status == _Codecvt::noconv)
1.303 +#ifdef __SYMBIAN32__
1.304 + {
1.305 + if(_Noconv_output<_Traits>::_M_doit(this, __ibegin, __iend))
1.306 + {
1.307 + if (this->eback())
1.308 + {
1.309 + *(this->gptr()) = __c;
1.310 + this->setg(this->eback(), this->gptr() + 1, this->egptr());
1.311 + }
1.312 + if(putflag && this->pptr() < this->epptr())
1.313 + this->setp(this->pptr() + 1, this->epptr());
1.314 + return traits_type::not_eof(__c);
1.315 + }
1.316 + else
1.317 + return _M_output_error();
1.318 + }
1.319 +#else
1.320 + return _Noconv_output<_Traits>::_M_doit(this, __ibegin, __iend)
1.321 + ? traits_type::not_eof(__c)
1.322 + : _M_output_error();
1.323 +#endif
1.324 + // For a constant-width encoding we know that the external buffer
1.325 + // is large enough, so failure to consume the entire internal buffer
1.326 + // or to produce the correct number of external characters, is an error.
1.327 + // For a variable-width encoding, however, we require only that we
1.328 + // consume at least one internal character
1.329 + else if (__status != _Codecvt::error &&
1.330 + ((__inext == __iend && (__enext - _M_ext_buf ==
1.331 + _M_width * (__iend - __ibegin))) ||
1.332 + (!_M_constant_width && __inext != __ibegin))) {
1.333 + // We successfully converted part or all of the internal buffer.
1.334 + ptrdiff_t __n = __enext - _M_ext_buf;
1.335 + if (_M_write(_M_ext_buf, __n))
1.336 + __ibegin += __inext - __ibegin;
1.337 + else
1.338 + return _M_output_error();
1.339 + }
1.340 + else
1.341 + return _M_output_error();
1.342 + }
1.343 +
1.344 + return traits_type::not_eof(__c);
1.345 +}
1.346 +
1.347 +// This member function must be called before any I/O has been
1.348 +// performed on the stream, otherwise it has no effect.
1.349 +//
1.350 +// __buf == 0 && __n == 0 means to make ths stream unbuffered.
1.351 +// __buf != 0 && __n > 0 means to use __buf as the stream's internal
1.352 +// buffer, rather than the buffer that would otherwise be allocated
1.353 +// automatically. __buf must be a pointer to an array of _CharT whose
1.354 +// size is at least __n.
1.355 +template <class _CharT, class _Traits>
1.356 +basic_streambuf<_CharT, _Traits>*
1.357 +basic_filebuf<_CharT, _Traits>::setbuf(_CharT* __buf, streamsize __n)
1.358 +{
1.359 + if (!_M_in_input_mode &&! _M_in_output_mode && !_M_in_error_mode &&
1.360 + _M_int_buf == 0) {
1.361 + if (__buf == 0 && __n == 0)
1.362 + _M_allocate_buffers(0, 1);
1.363 + else if (__buf != 0 && __n > 0)
1.364 + _M_allocate_buffers(__buf, __n);
1.365 + }
1.366 + return this;
1.367 +}
1.368 +
1.369 +template <class _CharT, class _Traits>
1.370 +__BF_pos_type__
1.371 +basic_filebuf<_CharT, _Traits>::seekoff(off_type __off,
1.372 + ios_base::seekdir __whence,
1.373 + ios_base::openmode /* dummy */)
1.374 +{
1.375 + if (this->is_open() &&
1.376 + (__off == 0 || (_M_constant_width && this->_M_base._M_in_binary_mode()))) {
1.377 +
1.378 + if (!_M_seek_init(__off != 0 || __whence != ios_base::cur))
1.379 + return pos_type(-1);
1.380 +
1.381 + // Seek to beginning or end, regardless of whether we're in input mode.
1.382 + if (__whence == ios_base::beg || __whence == ios_base::end)
1.383 + return _M_seek_return(_M_base._M_seek(_M_width * __off, __whence),
1.384 + _State_type());
1.385 +
1.386 + // Seek relative to current position. Complicated if we're in input mode.
1.387 + else if (__whence == ios_base::cur) {
1.388 +
1.389 + if (!_M_in_input_mode)
1.390 + return _M_seek_return(_M_base._M_seek(_M_width * __off, __whence),
1.391 + _State_type());
1.392 + else if (_M_mmap_base != 0) {
1.393 + // __off is relative to gptr(). We need to do a bit of arithmetic
1.394 + // to get an offset relative to the external file pointer.
1.395 + streamoff __adjust = _M_mmap_len - (this->gptr() - (_CharT*) _M_mmap_base);
1.396 +
1.397 + // if __off == 0, we do not need to exit input mode and to shift file pointer
1.398 + if (__off == 0) {
1.399 + return pos_type(_M_base._M_seek(0, ios_base::cur) - __adjust);
1.400 + }
1.401 + else
1.402 +#ifdef __SYMBIAN32__
1.403 + return _M_seek_return(_M_base._M_seek(__off, ios_base::cur), _State_type());
1.404 +#else
1.405 + return _M_seek_return(_M_base._M_seek(__off - __adjust, ios_base::cur), _State_type());
1.406 +#endif
1.407 + }
1.408 + else if (_M_constant_width) { // Get or set the position.
1.409 +
1.410 + streamoff __iadj = _M_width * (this->gptr() - this->eback());
1.411 +
1.412 + // Compensate for offset relative to gptr versus offset relative
1.413 + // to external pointer. For a text-oriented stream, where the
1.414 + // compensation is more than just pointer arithmetic, we may get
1.415 + // but not set the current position.
1.416 +
1.417 + if (__iadj <= _M_ext_buf_end - _M_ext_buf) {
1.418 +
1.419 + streamoff __eadj = _M_base._M_get_offset(_M_ext_buf + __iadj, _M_ext_buf_end);
1.420 +
1.421 + if (__off == 0) {
1.422 + return pos_type(_M_base._M_seek(0, ios_base::cur) - __eadj);
1.423 + } else {
1.424 + return _M_seek_return(_M_base._M_seek(__off - __eadj, ios_base::cur), _State_type());
1.425 + }
1.426 + }
1.427 + else
1.428 + return pos_type(-1);
1.429 + }
1.430 + else { // Get the position. Encoding is var width.
1.431 + // Get position in internal buffer.
1.432 + ptrdiff_t __ipos = this->gptr() - this->eback();
1.433 +
1.434 + // Get corresponding position in external buffer.
1.435 + _State_type __state = _M_state;
1.436 + int __epos = _M_codecvt->length(__state, _M_ext_buf, _M_ext_buf_end,
1.437 + __ipos);
1.438 +
1.439 + // Sanity check (expensive): make sure __epos is the right answer.
1.440 + _State_type __tmp_state = _M_state;
1.441 + _Filebuf_Tmp_Buf<_CharT> __buf(__ipos);
1.442 + _CharT* __ibegin = __buf._M_ptr;
1.443 + _CharT* __inext = __ibegin;
1.444 +
1.445 + const char* __dummy;
1.446 + typename _Codecvt::result __status
1.447 + = _M_codecvt->in(__tmp_state,
1.448 + _M_ext_buf, _M_ext_buf + __epos, __dummy,
1.449 + __ibegin, __ibegin + __ipos, __inext);
1.450 + if (__status != _Codecvt::error &&
1.451 + (__status == _Codecvt::noconv ||
1.452 + (__inext == __ibegin + __ipos &&
1.453 + equal(this->gptr(), this->eback(), __ibegin,
1.454 + _Eq_traits<traits_type>())))) {
1.455 + // Get the current position (at the end of the external buffer),
1.456 + // then adjust it. Again, it might be a text-oriented stream.
1.457 + streamoff __cur = _M_base._M_seek(0, ios_base::cur);
1.458 + streamoff __adj =
1.459 + _M_base._M_get_offset(_M_ext_buf, _M_ext_buf + __epos) -
1.460 + _M_base._M_get_offset(_M_ext_buf, _M_ext_buf_end);
1.461 + if (__cur != -1 && __cur + __adj >= 0)
1.462 + return _M_seek_return(__cur + __adj, __state);
1.463 + else
1.464 + return pos_type(-1);
1.465 + }
1.466 + else // We failed the sanity check.
1.467 + return pos_type(-1);
1.468 + }
1.469 + }
1.470 + else // Unrecognized value for __whence.
1.471 + return pos_type(-1);
1.472 + }
1.473 + else
1.474 + return pos_type(-1);
1.475 +}
1.476 +
1.477 +
1.478 +template <class _CharT, class _Traits>
1.479 +__BF_pos_type__
1.480 +basic_filebuf<_CharT, _Traits>::seekpos(pos_type __pos,
1.481 + ios_base::openmode /* dummy */)
1.482 +{
1.483 + if (this->is_open()) {
1.484 + if (!_M_seek_init(true))
1.485 + return pos_type(-1);
1.486 +
1.487 + streamoff __off = off_type(__pos);
1.488 + if (__off != -1 && _M_base._M_seek(__off, ios_base::beg) != -1) {
1.489 + _M_state = __pos.state();
1.490 + return _M_seek_return(__off, __pos.state());
1.491 + }
1.492 + else
1.493 + return pos_type(-1);
1.494 + }
1.495 + else
1.496 + return pos_type(-1);
1.497 +}
1.498 +
1.499 +
1.500 +template <class _CharT, class _Traits>
1.501 +int basic_filebuf<_CharT, _Traits>::sync()
1.502 +{
1.503 + if (_M_in_output_mode)
1.504 + return traits_type::eq_int_type(this->overflow(traits_type::eof()),
1.505 + traits_type::eof())
1.506 + ? -1
1.507 + : 0;
1.508 + else
1.509 + return 0;
1.510 +}
1.511 +
1.512 +
1.513 +// Change the filebuf's locale. This member function has no effect
1.514 +// unless it is called before any I/O is performed on the stream.
1.515 +template <class _CharT, class _Traits>
1.516 +void basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc)
1.517 +{
1.518 + if (!_M_in_input_mode &&! _M_in_output_mode && !_M_in_error_mode) {
1.519 + this->_M_setup_codecvt(__loc);
1.520 + }
1.521 +}
1.522 +
1.523 +//----------------------------------------------------------------------
1.524 +// basic_filebuf<> helper functions.
1.525 +
1.526 +//----------------------------------------
1.527 +// Helper functions for switching between modes.
1.528 +
1.529 +// This member function is called if we're performing the first I/O
1.530 +// operation on a filebuf, or if we're performing an input operation
1.531 +// immediately after a seek.
1.532 +template <class _CharT, class _Traits>
1.533 +bool basic_filebuf<_CharT, _Traits>::_M_switch_to_input_mode()
1.534 +{
1.535 +
1.536 + if (this->is_open() && (((int)_M_base.__o_mode() & (int)ios_base::in) !=0)
1.537 +#ifndef __SYMBIAN32__
1.538 + && (_M_in_output_mode == 0)
1.539 +#endif
1.540 + && (_M_in_error_mode == 0)) {
1.541 +#ifdef __STLP_NO_WRITE_SIDE_BUFFERING__
1.542 + // If file has been opened in input|output mode
1.543 + if ((((int)_M_base.__o_mode() & (int)ios_base::out) !=0)
1.544 +#ifndef __SYMBIAN32__
1.545 + && sync()
1.546 +#endif
1.547 + && !_M_int_buf && !_M_allocate_buffers(0, 1))
1.548 +#else
1.549 + if (!_M_int_buf && !_M_allocate_buffers())
1.550 +#endif
1.551 + return false;
1.552 +
1.553 + _M_ext_buf_converted = _M_ext_buf;
1.554 + _M_ext_buf_end = _M_ext_buf;
1.555 +
1.556 + _M_end_state = _M_state;
1.557 +
1.558 + _M_in_input_mode = true;
1.559 + return true;
1.560 + }
1.561 + else
1.562 +
1.563 + return false;
1.564 +}
1.565 +
1.566 +
1.567 +// This member function is called if we're performing the first I/O
1.568 +// operation on a filebuf, or if we're performing an output operation
1.569 +// immediately after a seek.
1.570 +template <class _CharT, class _Traits>
1.571 +bool basic_filebuf<_CharT, _Traits>::_M_switch_to_output_mode()
1.572 +{
1.573 + if (this->is_open() && (_M_base.__o_mode() & (int)ios_base::out) &&
1.574 +#ifdef __SYMBIAN32__
1.575 + _M_in_error_mode == 0) {
1.576 +#else
1.577 + _M_in_input_mode == 0 && _M_in_error_mode == 0) {
1.578 +#endif //__SYMBIAN32__
1.579 +
1.580 +#ifdef __STLP_NO_WRITE_SIDE_BUFFERING__
1.581 + if (!_M_int_buf && !_M_allocate_buffers(0, 1))
1.582 +#else
1.583 + if (!_M_int_buf && !_M_allocate_buffers())
1.584 +#endif
1.585 + return false;
1.586 +
1.587 + // In append mode, every write does an implicit seek to the end
1.588 + // of the file. Whenever leaving output mode, the end of file
1.589 + // get put in the initial shift state.
1.590 + if (_M_base.__o_mode() & ios_base::app)
1.591 + _M_state = _State_type();
1.592 +
1.593 + this->setp(_M_int_buf, _M_int_buf_EOS - 1);
1.594 + _M_in_output_mode = true;
1.595 +
1.596 + return true;
1.597 + }
1.598 + else
1.599 + return false;
1.600 +}
1.601 +
1.602 +
1.603 +//----------------------------------------
1.604 +// Helper functions for input
1.605 +
1.606 +// This member function is called if there is an error during input.
1.607 +// It puts the filebuf in error mode, clear the get area buffer, and
1.608 +// returns eof.
1.609 +// returns eof. Error mode is sticky; it is cleared only by close or
1.610 +// seek.
1.611 +
1.612 +template <class _CharT, class _Traits>
1.613 +__BF_int_type__
1.614 +basic_filebuf<_CharT, _Traits>::_M_input_error()
1.615 +{
1.616 + this->_M_exit_input_mode();
1.617 + _M_in_output_mode = false;
1.618 + _M_in_error_mode = true;
1.619 + this->setg(0, 0, 0);
1.620 + return traits_type::eof();
1.621 +}
1.622 +
1.623 +template <class _CharT, class _Traits>
1.624 +__BF_int_type__
1.625 +basic_filebuf<_CharT, _Traits>::_M_underflow_aux()
1.626 +{
1.627 + // We have the state and file position from the end of the internal
1.628 + // buffer. This round, they become the beginning of the internal buffer.
1.629 + _M_state = _M_end_state;
1.630 +
1.631 + // Fill the external buffer. Start with any leftover characters that
1.632 + // didn't get converted last time.
1.633 + if (_M_ext_buf_end > _M_ext_buf_converted)
1.634 +
1.635 + _M_ext_buf_end = copy(_M_ext_buf_converted, _M_ext_buf_end, _M_ext_buf);
1.636 + // boris : copy_backward did not work
1.637 + //_M_ext_buf_end = copy_backward(_M_ext_buf_converted, _M_ext_buf_end,
1.638 + //_M_ext_buf+ (_M_ext_buf_end - _M_ext_buf_converted));
1.639 + else
1.640 + {
1.641 +#ifdef __SYMBIAN32__
1.642 + if(_M_ext_buf == NULL)
1.643 + _M_allocate_buffers(0, MMAP_CHUNK);
1.644 +#endif
1.645 + _M_ext_buf_end = _M_ext_buf;
1.646 + }
1.647 + // Now fill the external buffer with characters from the file. This is
1.648 + // a loop because occasonally we don't get enough external characters
1.649 + // to make progress.
1.650 + while (true) {
1.651 + ptrdiff_t __n = _M_base._M_read(_M_ext_buf_end, _M_ext_buf_EOS - _M_ext_buf_end);
1.652 +
1.653 + // Don't enter error mode for a failed read. Error mode is sticky,
1.654 + // and we might succeed if we try again.
1.655 +#ifdef __SYMBIAN32__ //plum hall bug 577
1.656 + int nn = (char*)_M_ext_buf_end-(char*)_M_ext_buf; //number of chars unconverted last time
1.657 + if ( (__n <= 0) && ( nn<=0 ) )
1.658 +#else
1.659 + if (__n <= 0)
1.660 +#endif
1.661 + return traits_type::eof();
1.662 +
1.663 + // Convert the external buffer to internal characters.
1.664 + _M_ext_buf_end += __n;
1.665 + const char* __enext;
1.666 + _CharT* __inext;
1.667 +
1.668 + typename _Codecvt::result __status
1.669 + = _M_codecvt->in(_M_end_state,
1.670 + _M_ext_buf, _M_ext_buf_end, __enext,
1.671 + _M_int_buf, _M_int_buf_EOS, __inext);
1.672 +
1.673 + // Error conditions: (1) Return value of error. (2) Producing internal
1.674 + // characters without consuming external characters. (3) In fixed-width
1.675 + // encodings, producing an internal sequence whose length is inconsistent
1.676 + // with that of the internal sequence. (4) Failure to produce any
1.677 + // characters if we have enough characters in the external buffer, where
1.678 + // "enough" means the largest possible width of a single character.
1.679 + if (__status == _Codecvt::noconv)
1.680 + return _Noconv_input<_Traits>::_M_doit(this);
1.681 +
1.682 + else if (__status == _Codecvt::error ||
1.683 + (__inext != _M_int_buf && __enext == _M_ext_buf) ||
1.684 + (_M_constant_width &&
1.685 + // __inext - _M_int_buf != _M_width * (__enext - _M_ext_buf)) ||
1.686 + (__inext - _M_int_buf) * _M_width != (__enext - _M_ext_buf)) ||
1.687 + (__inext == _M_int_buf && __enext - _M_ext_buf >= _M_max_width))
1.688 + return _M_input_error();
1.689 +
1.690 + else if (__inext != _M_int_buf) {
1.691 + _M_ext_buf_converted = _M_ext_buf + (__enext - _M_ext_buf);
1.692 + this->setg(_M_int_buf, _M_int_buf, __inext);
1.693 + return traits_type::to_int_type(*_M_int_buf);
1.694 + }
1.695 + // We need to go around the loop again to get more external characters.
1.696 + }
1.697 +}
1.698 +
1.699 +//----------------------------------------
1.700 +// Helper functions for output
1.701 +
1.702 +// This member function is called if there is an error during output.
1.703 +// It puts the filebuf in error mode, clear the put area buffer, and
1.704 +// returns eof. Error mode is sticky; it is cleared only by close or
1.705 +// seek.
1.706 +template <class _CharT, class _Traits>
1.707 +__BF_int_type__
1.708 +basic_filebuf<_CharT, _Traits>::_M_output_error()
1.709 +{
1.710 + _M_in_output_mode = false;
1.711 + _M_in_input_mode = false;
1.712 + _M_in_error_mode = true;
1.713 + this->setp(0, 0);
1.714 + return traits_type::eof();
1.715 +}
1.716 +
1.717 +
1.718 +// Write whatever sequence of characters is necessary to get back to
1.719 +// the initial shift state. This function overwrites the external
1.720 +// buffer, changes the external file position, and changes the state.
1.721 +// Precondition: the internal buffer is empty.
1.722 +template <class _CharT, class _Traits>
1.723 +bool basic_filebuf<_CharT, _Traits>::_M_unshift()
1.724 +{
1.725 + if (_M_in_output_mode && !_M_constant_width) {
1.726 + typename _Codecvt::result __status;
1.727 + do {
1.728 + char* __enext = _M_ext_buf;
1.729 + __status = _M_codecvt->unshift(_M_state,
1.730 + _M_ext_buf, _M_ext_buf_EOS, __enext);
1.731 + if (__status == _Codecvt::noconv ||
1.732 + (__enext == _M_ext_buf && __status == _Codecvt::ok))
1.733 + return true;
1.734 + else if (__status == _Codecvt::error)
1.735 + return false;
1.736 + else if (!_M_write(_M_ext_buf, __enext - _M_ext_buf))
1.737 + return false;
1.738 + } while(__status == _Codecvt::partial);
1.739 + }
1.740 +
1.741 + return true;
1.742 +}
1.743 +
1.744 +
1.745 +//----------------------------------------
1.746 +// Helper functions for buffer allocation and deallocation
1.747 +
1.748 +// This member function is called when we're initializing a filebuf's
1.749 +// internal and external buffers. The argument is the size of the
1.750 +// internal buffer; the external buffer is sized using the character
1.751 +// width in the current encoding. Preconditions: the buffers are currently
1.752 +// null. __n >= 1. __buf is either a null pointer or a pointer to an
1.753 +// array show size is at least __n.
1.754 +
1.755 +// We need __n >= 1 for two different reasons. For input, the base
1.756 +// class always needs a buffer because of the sementics of underflow().
1.757 +// For output, we want to have an internal buffer that's larger by one
1.758 +// element than the buffer that the base class knows about. (See
1.759 +// basic_filebuf<>::overflow() for the reason.)
1.760 +template <class _CharT, class _Traits>
1.761 +bool
1.762 +basic_filebuf<_CharT, _Traits>::_M_allocate_buffers(_CharT* __buf, streamsize __n)
1.763 +{
1.764 +
1.765 + if (__buf == 0) {
1.766 + _M_int_buf = __STATIC_CAST(_CharT*,malloc(__n * sizeof(_CharT)));
1.767 + if (! _M_int_buf)
1.768 + return false;
1.769 + _M_int_buf_dynamic = true;
1.770 + }
1.771 + else {
1.772 + _M_int_buf = __buf;
1.773 + _M_int_buf_dynamic = false;
1.774 + }
1.775 +
1.776 + size_t __ebufsiz = (max)(__n * (max)(_M_codecvt->encoding(), 1),
1.777 + streamsize(_M_codecvt->max_length()));
1.778 +
1.779 + _M_ext_buf = __STATIC_CAST(char*,malloc(__ebufsiz));
1.780 + if (!_M_ext_buf) {
1.781 + _M_deallocate_buffers();
1.782 + return false;
1.783 + }
1.784 +
1.785 + _M_int_buf_EOS = _M_int_buf + __n;
1.786 + _M_ext_buf_EOS = _M_ext_buf + __ebufsiz;
1.787 + return true;
1.788 +}
1.789 +
1.790 +// Abbreviation for the most common case.
1.791 +template <class _CharT, class _Traits>
1.792 +bool basic_filebuf<_CharT, _Traits>::_M_allocate_buffers()
1.793 +{
1.794 + // Choose a buffer that's at least 4096 characters long and that's a
1.795 + // multiple of the page size.
1.796 + streamsize __default_bufsiz =
1.797 + ((_M_base.__page_size() + 4095UL) / _M_base.__page_size()) * _M_base.__page_size();
1.798 + return _M_allocate_buffers(0, __default_bufsiz);
1.799 +}
1.800 +
1.801 +template <class _CharT, class _Traits>
1.802 +void basic_filebuf<_CharT, _Traits>::_M_deallocate_buffers()
1.803 +{
1.804 + if (_M_int_buf_dynamic)
1.805 + free(_M_int_buf);
1.806 + free(_M_ext_buf);
1.807 + _M_int_buf = 0;
1.808 + _M_int_buf_EOS = 0;
1.809 + _M_ext_buf = 0;
1.810 + _M_ext_buf_EOS = 0;
1.811 +}
1.812 +
1.813 +
1.814 +//----------------------------------------
1.815 +// Helper functiosn for seek and imbue
1.816 +
1.817 +template <class _CharT, class _Traits>
1.818 +bool basic_filebuf<_CharT, _Traits>::_M_seek_init(bool __do_unshift) {
1.819 + // If we're in error mode, leave it.
1.820 + _M_in_error_mode = false;
1.821 +
1.822 + // Flush the output buffer if we're in output mode, and (conditionally)
1.823 + // emit an unshift sequence.
1.824 + if (_M_in_output_mode) {
1.825 + bool __ok = !traits_type::eq_int_type(this->overflow(traits_type::eof()),
1.826 + traits_type::eof());
1.827 + if (__do_unshift)
1.828 + __ok = __ok && this->_M_unshift();
1.829 + if (!__ok) {
1.830 + _M_in_output_mode = false;
1.831 + _M_in_error_mode = true;
1.832 + this->setp(0, 0);
1.833 + return false;
1.834 + }
1.835 + }
1.836 +
1.837 + // Discard putback characters, if any.
1.838 + if (_M_in_input_mode && _M_in_putback_mode)
1.839 + _M_exit_putback_mode();
1.840 +
1.841 + return true;
1.842 +}
1.843 +
1.844 +
1.845 +// Change the filebuf's locale. This member function has no effect
1.846 +// unless it is called before any I/O is performed on the stream.
1.847 +template <class _CharT, class _Traits>
1.848 +void basic_filebuf<_CharT, _Traits>::_M_setup_codecvt(const locale& __loc)
1.849 +{
1.850 + _M_codecvt = &use_facet<_Codecvt>(__loc) ;
1.851 + int __encoding = _M_codecvt->encoding();
1.852 +
1.853 + _M_width = (max)(__encoding, 1);
1.854 + _M_max_width = _M_codecvt->max_length();
1.855 + _M_constant_width = __encoding > 0;
1.856 + _M_always_noconv = _M_codecvt->always_noconv();
1.857 +}
1.858 +
1.859 +
1.860 +
1.861 +template <class _CharT, class _Traits>
1.862 + _STLP_EXP_DECLSPEC basic_fstream<_CharT, _Traits>::basic_fstream()
1.863 + : basic_ios<_CharT, _Traits>(), basic_iostream<_CharT, _Traits>(0), _M_buf() {
1.864 + this->init(&_M_buf);
1.865 + }
1.866 +
1.867 +
1.868 +template <class _CharT, class _Traits>
1.869 + _STLP_EXP_DECLSPEC basic_fstream<_CharT, _Traits>::~basic_fstream(){}
1.870 +
1.871 +#ifdef __SYMBIAN32__
1.872 +template <class _CharT, class _Traits>
1.873 +int basic_filebuf<_CharT, _Traits>::save_read_buffer ()
1.874 + {
1.875 + return _M_in_putback_mode ? _M_saved_egptr - _M_saved_gptr : 0;
1.876 + }
1.877 +template <class _CharT, class _Traits>
1.878 +void basic_filebuf<_CharT, _Traits>::_change_input_mode ()
1.879 + {
1.880 + _M_in_input_mode = 1;
1.881 + }
1.882 +
1.883 +#endif
1.884 +
1.885 +_STLP_END_NAMESPACE
1.886 +
1.887 +# undef __BF_int_type__
1.888 +# undef __BF_pos_type__
1.889 +# undef __BF_off_type__
1.890 +
1.891 +# endif /* defined (_STLP_EXPOSE_STREAM_IMPLEMENTATION) */
1.892 +
1.893 +#endif /* _STLP_FSTREAM_C */
1.894 +