--- /dev/null
+/*
+ * Copyright (c) 1996,1997
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Copyright (c) 1999
+ * Boris Fomitchev
+ *
+ * This material is provided "as is", with absolutely no warranty expressed
+ * or implied. Any use is at your own risk.
+ *
+ * Permission to use or copy this software for any purpose is hereby granted
+ * without fee, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ *
+ */
+#ifndef _STLP_FSTREAM_C
+#define _STLP_FSTREAM_C
+
+#ifndef _STLP_INTERNAL_FSTREAM_H
+# include <stl/_fstream.h>
+#endif
+
+#ifndef _STLP_INTERNAL_LIMITS
+# include <stl/_limits.h>
+#endif
+
+_STLP_BEGIN_NAMESPACE
+
+# if defined ( _STLP_NESTED_TYPE_PARAM_BUG )
+// no wchar_t is supported for this mode
+# define __BF_int_type__ int
+# define __BF_pos_type__ streampos
+# define __BF_off_type__ streamoff
+# else
+# define __BF_int_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_filebuf<_CharT, _Traits>::int_type
+# define __BF_pos_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_filebuf<_CharT, _Traits>::pos_type
+# define __BF_off_type__ _STLP_TYPENAME_ON_RETURN_TYPE basic_filebuf<_CharT, _Traits>::off_type
+# endif
+
+
+//----------------------------------------------------------------------
+// Public basic_filebuf<> member functions
+
+template <class _CharT, class _Traits>
+basic_filebuf<_CharT, _Traits>::basic_filebuf()
+ : basic_streambuf<_CharT, _Traits>(), _M_base(),
+ _M_constant_width(false), _M_always_noconv(false),
+ _M_int_buf_dynamic(false),
+ _M_in_input_mode(false), _M_in_output_mode(false),
+ _M_in_error_mode(false), _M_in_putback_mode(false),
+ _M_int_buf(0), _M_int_buf_EOS(0),
+ _M_ext_buf(0), _M_ext_buf_EOS(0),
+ _M_ext_buf_converted(0), _M_ext_buf_end(0),
+ _M_state(_STLP_DEFAULT_CONSTRUCTED(_State_type)),
+ _M_end_state(_STLP_DEFAULT_CONSTRUCTED(_State_type)),
+ _M_mmap_base(0), _M_mmap_len(0),
+ _M_saved_eback(0), _M_saved_gptr(0), _M_saved_egptr(0),
+ _M_codecvt(0),
+ _M_width(1), _M_max_width(1)
+{
+ this->_M_setup_codecvt(locale(), false);
+}
+
+template <class _CharT, class _Traits>
+basic_filebuf<_CharT, _Traits>::~basic_filebuf() {
+ this->close();
+ _M_deallocate_buffers();
+}
+
+
+template <class _CharT, class _Traits>
+_STLP_TYPENAME_ON_RETURN_TYPE basic_filebuf<_CharT, _Traits>::int_type
+basic_filebuf<_CharT, _Traits>::underflow() {
+ return _Underflow<_CharT, _Traits>::_M_doit(this);
+}
+
+template <class _CharT, class _Traits>
+basic_filebuf<_CharT, _Traits>*
+basic_filebuf<_CharT, _Traits>::close() {
+ bool __ok = this->is_open();
+
+ if (_M_in_output_mode) {
+ __ok = __ok && !_Traits::eq_int_type(this->overflow(traits_type::eof()),
+ traits_type::eof());
+ __ok == __ok && this->_M_unshift();
+ }
+ else if (_M_in_input_mode)
+ this->_M_exit_input_mode();
+
+ // Note order of arguments. We close the file even if __ok is false.
+ __ok = _M_base._M_close() && __ok;
+
+ // Restore the initial state, except that we don't deallocate the buffer
+ // or mess with the cached codecvt information.
+ _M_state = _M_end_state = _State_type();
+ _M_ext_buf_converted = _M_ext_buf_end = 0;
+
+ _M_mmap_base = 0;
+ _M_mmap_len = 0;
+
+ this->setg(0, 0, 0);
+ this->setp(0, 0);
+
+ _M_saved_eback = _M_saved_gptr = _M_saved_egptr = 0;
+
+ _M_in_input_mode = _M_in_output_mode = _M_in_error_mode = _M_in_putback_mode
+ = false;
+
+ return __ok ? this : 0;
+}
+
+// This member function is called whenever we exit input mode.
+// It unmaps the memory-mapped file, if any, and sets
+// _M_in_input_mode to false.
+template <class _CharT, class _Traits>
+void basic_filebuf<_CharT, _Traits>::_M_exit_input_mode() {
+ if (_M_mmap_base != 0)
+ _M_base._M_unmap(_M_mmap_base, _M_mmap_len);
+ _M_in_input_mode = false;
+ _M_mmap_base = 0;
+}
+
+
+//----------------------------------------------------------------------
+// basic_filebuf<> overridden protected virtual member functions
+
+template <class _CharT, class _Traits>
+streamsize basic_filebuf<_CharT, _Traits>::showmanyc() {
+ // Is there any possibility that reads can succeed?
+ if (!this->is_open() || _M_in_output_mode || _M_in_error_mode)
+ return -1;
+ else if (_M_in_putback_mode)
+ return this->egptr() - this->gptr();
+ else if (_M_constant_width) {
+ streamoff __pos = _M_base._M_seek(0, ios_base::cur);
+ streamoff __size = _M_base._M_file_size();
+ return __pos >= 0 && __size > __pos ? __size - __pos : 0;
+ }
+ else
+ return 0;
+}
+
+
+// Make a putback position available, if necessary, by switching to a
+// special internal buffer used only for putback. The buffer is
+// [_M_pback_buf, _M_pback_buf + _S_pback_buf_size), but the base
+// class only sees a piece of it at a time. (We want to make sure
+// that we don't try to read a character that hasn't been initialized.)
+// The end of the putback buffer is always _M_pback_buf + _S_pback_buf_size,
+// but the beginning is usually not _M_pback_buf.
+template <class _CharT, class _Traits>
+__BF_int_type__
+basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c) {
+ const int_type __eof = traits_type::eof();
+
+ // If we aren't already in input mode, pushback is impossible.
+ if (!_M_in_input_mode)
+ return __eof;
+
+ // We can use the ordinary get buffer if there's enough space, and
+ // if it's a buffer that we're allowed to write to.
+ if (this->gptr() != this->eback() &&
+ (traits_type::eq_int_type(__c, __eof) ||
+ traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]) ||
+ !_M_mmap_base)) {
+ this->gbump(-1);
+ if (traits_type::eq_int_type(__c, __eof) ||
+ traits_type::eq(traits_type::to_char_type(__c), *this->gptr()))
+ return traits_type::to_int_type(*this->gptr());
+ }
+ else if (!traits_type::eq_int_type(__c, __eof)) {
+ // Are we in the putback buffer already?
+ _CharT* __pback_end = _M_pback_buf + __STATIC_CAST(int,_S_pback_buf_size);
+ if (_M_in_putback_mode) {
+ // Do we have more room in the putback buffer?
+ if (this->eback() != _M_pback_buf)
+ this->setg(this->egptr() - 1, this->egptr() - 1, __pback_end);
+ else
+ return __eof; // No more room in the buffer, so fail.
+ }
+ else { // We're not yet in the putback buffer.
+ _M_saved_eback = this->eback();
+ _M_saved_gptr = this->gptr();
+ _M_saved_egptr = this->egptr();
+ this->setg(__pback_end - 1, __pback_end - 1, __pback_end);
+ _M_in_putback_mode = true;
+ }
+ }
+ else
+ return __eof;
+
+ // We have made a putback position available. Assign to it, and return.
+ *this->gptr() = traits_type::to_char_type(__c);
+ return __c;
+}
+
+// This member function flushes the put area, and also outputs the
+// character __c (unless __c is eof). Invariant: we always leave room
+// in the internal buffer for one character more than the base class knows
+// about. We see the internal buffer as [_M_int_buf, _M_int_buf_EOS), but
+// the base class only sees [_M_int_buf, _M_int_buf_EOS - 1).
+template <class _CharT, class _Traits>
+__BF_int_type__
+basic_filebuf<_CharT, _Traits>::overflow(int_type __c) {
+ // Switch to output mode, if necessary.
+ if (!_M_in_output_mode)
+ if (!_M_switch_to_output_mode())
+ return traits_type::eof();
+
+ _CharT* __ibegin = this->_M_int_buf;
+ _CharT* __iend = this->pptr();
+ this->setp(_M_int_buf, _M_int_buf_EOS - 1);
+
+ // Put __c at the end of the internal buffer.
+ if (!traits_type::eq_int_type(__c, traits_type::eof()))
+ *__iend++ = _Traits::to_char_type(__c);
+
+ // For variable-width encodings, output may take more than one pass.
+ while (__ibegin != __iend) {
+ const _CharT* __inext = __ibegin;
+ char* __enext = _M_ext_buf;
+ typename _Codecvt::result __status
+ = _M_codecvt->out(_M_state, __ibegin, __iend, __inext,
+ _M_ext_buf, _M_ext_buf_EOS, __enext);
+ if (__status == _Codecvt::noconv) {
+ return _Noconv_output<_Traits>::_M_doit(this, __ibegin, __iend)
+ ? traits_type::not_eof(__c)
+ : _M_output_error();
+ }
+
+ // For a constant-width encoding we know that the external buffer
+ // is large enough, so failure to consume the entire internal buffer
+ // or to produce the correct number of external characters, is an error.
+ // For a variable-width encoding, however, we require only that we
+ // consume at least one internal character
+ else if (__status != _Codecvt::error &&
+ (((__inext == __iend) &&
+ (__enext - _M_ext_buf == _M_width * (__iend - __ibegin))) ||
+ (!_M_constant_width && __inext != __ibegin))) {
+ // We successfully converted part or all of the internal buffer.
+ ptrdiff_t __n = __enext - _M_ext_buf;
+ if (_M_write(_M_ext_buf, __n))
+ __ibegin += __inext - __ibegin;
+ else
+ return _M_output_error();
+ }
+ else
+ return _M_output_error();
+ }
+
+ return traits_type::not_eof(__c);
+}
+
+// This member function must be called before any I/O has been
+// performed on the stream, otherwise it has no effect.
+//
+// __buf == 0 && __n == 0 means to make this stream unbuffered.
+// __buf != 0 && __n > 0 means to use __buf as the stream's internal
+// buffer, rather than the buffer that would otherwise be allocated
+// automatically. __buf must be a pointer to an array of _CharT whose
+// size is at least __n.
+template <class _CharT, class _Traits>
+basic_streambuf<_CharT, _Traits>*
+basic_filebuf<_CharT, _Traits>::setbuf(_CharT* __buf, streamsize __n) {
+ if (!_M_in_input_mode &&! _M_in_output_mode && !_M_in_error_mode &&
+ _M_int_buf == 0) {
+ if (__buf == 0 && __n == 0)
+ _M_allocate_buffers(0, 1);
+ else if (__buf != 0 && __n > 0)
+ _M_allocate_buffers(__buf, __n);
+ }
+ return this;
+}
+
+template <class _CharT, class _Traits>
+__BF_pos_type__
+basic_filebuf<_CharT, _Traits>::seekoff(off_type __off,
+ ios_base::seekdir __whence,
+ ios_base::openmode /* dummy */) {
+ if (this->is_open() &&
+ (__off == 0 || (_M_constant_width && this->_M_base._M_in_binary_mode()))) {
+
+ if (!_M_seek_init(__off != 0 || __whence != ios_base::cur))
+ return pos_type(-1);
+
+ // Seek to beginning or end, regardless of whether we're in input mode.
+ if (__whence == ios_base::beg || __whence == ios_base::end)
+ return _M_seek_return(_M_base._M_seek(_M_width * __off, __whence),
+ _State_type());
+
+ // Seek relative to current position. Complicated if we're in input mode.
+ else if (__whence == ios_base::cur) {
+ if (!_M_in_input_mode)
+ return _M_seek_return(_M_base._M_seek(_M_width * __off, __whence),
+ _State_type());
+ else if (_M_mmap_base != 0) {
+ // __off is relative to gptr(). We need to do a bit of arithmetic
+ // to get an offset relative to the external file pointer.
+ streamoff __adjust = _M_mmap_len - (this->gptr() - (_CharT*) _M_mmap_base);
+
+ // if __off == 0, we do not need to exit input mode and to shift file pointer
+ return __off == 0 ? pos_type(_M_base._M_seek(0, ios_base::cur) - __adjust)
+ : _M_seek_return(_M_base._M_seek(__off - __adjust, ios_base::cur), _State_type());
+ }
+ else if (_M_constant_width) { // Get or set the position.
+ streamoff __iadj = _M_width * (this->gptr() - this->eback());
+
+ // Compensate for offset relative to gptr versus offset relative
+ // to external pointer. For a text-oriented stream, where the
+ // compensation is more than just pointer arithmetic, we may get
+ // but not set the current position.
+
+ if (__iadj <= _M_ext_buf_end - _M_ext_buf) {
+ streamoff __eadj = _M_base._M_get_offset(_M_ext_buf + __STATIC_CAST(ptrdiff_t, __iadj), _M_ext_buf_end);
+
+ return __off == 0 ? pos_type(_M_base._M_seek(0, ios_base::cur) - __eadj)
+ : _M_seek_return(_M_base._M_seek(__off - __eadj, ios_base::cur), _State_type());
+ }
+ } else { // Get the position. Encoding is var width.
+ // Get position in internal buffer.
+ ptrdiff_t __ipos = this->gptr() - this->eback();
+
+ // Get corresponding position in external buffer.
+ _State_type __state = _M_state;
+ int __epos = _M_codecvt->length(__state, _M_ext_buf, _M_ext_buf_end,
+ __ipos);
+
+ if (__epos >= 0) {
+ // Sanity check (expensive): make sure __epos is the right answer.
+ _State_type __tmp_state = _M_state;
+ _Filebuf_Tmp_Buf<_CharT> __buf(__ipos);
+ _CharT* __ibegin = __buf._M_ptr;
+ _CharT* __inext = __ibegin;
+
+ const char* __dummy;
+ typename _Codecvt::result __status
+ = _M_codecvt->in(__tmp_state,
+ _M_ext_buf, _M_ext_buf + __epos, __dummy,
+ __ibegin, __ibegin + __ipos, __inext);
+ if (__status != _Codecvt::error &&
+ (__status == _Codecvt::noconv ||
+ (__inext == __ibegin + __ipos &&
+ equal(this->eback(), this->gptr(), __ibegin, _STLP_PRIV _Eq_traits<traits_type>())))) {
+ // Get the current position (at the end of the external buffer),
+ // then adjust it. Again, it might be a text-oriented stream.
+ streamoff __cur = _M_base._M_seek(0, ios_base::cur);
+ streamoff __adj =
+ _M_base._M_get_offset(_M_ext_buf, _M_ext_buf + __epos) -
+ _M_base._M_get_offset(_M_ext_buf, _M_ext_buf_end);
+ if (__cur != -1 && __cur + __adj >= 0)
+ return __off == 0 ? pos_type(__cur + __adj)
+ : _M_seek_return(__cur + __adj, __state);
+ //return _M_seek_return(__cur + __adj, __state);
+ }
+ // We failed the sanity check here.
+ }
+ }
+ }
+ // Unrecognized value for __whence here.
+ }
+
+ return pos_type(-1);
+}
+
+
+template <class _CharT, class _Traits>
+__BF_pos_type__
+basic_filebuf<_CharT, _Traits>::seekpos(pos_type __pos,
+ ios_base::openmode /* dummy */) {
+ if (this->is_open()) {
+ if (!_M_seek_init(true))
+ return pos_type(-1);
+
+ streamoff __off = off_type(__pos);
+ if (__off != -1 && _M_base._M_seek(__off, ios_base::beg) != -1) {
+ _M_state = __pos.state();
+ return _M_seek_return(__off, __pos.state());
+ }
+ }
+
+ return pos_type(-1);
+}
+
+
+template <class _CharT, class _Traits>
+int basic_filebuf<_CharT, _Traits>::sync() {
+ if (_M_in_output_mode)
+ return traits_type::eq_int_type(this->overflow(traits_type::eof()),
+ traits_type::eof()) ? -1 : 0;
+ return 0;
+}
+
+
+// Change the filebuf's locale. This member function has no effect
+// unless it is called before any I/O is performed on the stream.
+template <class _CharT, class _Traits>
+void basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc) {
+ if (!_M_in_input_mode && !_M_in_output_mode && !_M_in_error_mode) {
+ this->_M_setup_codecvt(__loc);
+ }
+}
+
+//----------------------------------------------------------------------
+// basic_filebuf<> helper functions.
+
+//----------------------------------------
+// Helper functions for switching between modes.
+
+// This member function is called if we're performing the first I/O
+// operation on a filebuf, or if we're performing an input operation
+// immediately after a seek.
+template <class _CharT, class _Traits>
+bool basic_filebuf<_CharT, _Traits>::_M_switch_to_input_mode() {
+ if (this->is_open() && (((int)_M_base.__o_mode() & (int)ios_base::in) != 0)
+ && (_M_in_output_mode == 0) && (_M_in_error_mode == 0)) {
+ if (!_M_int_buf && !_M_allocate_buffers())
+ return false;
+
+ _M_ext_buf_converted = _M_ext_buf;
+ _M_ext_buf_end = _M_ext_buf;
+
+ _M_end_state = _M_state;
+
+ _M_in_input_mode = true;
+ return true;
+ }
+
+ return false;
+}
+
+
+// This member function is called if we're performing the first I/O
+// operation on a filebuf, or if we're performing an output operation
+// immediately after a seek.
+template <class _CharT, class _Traits>
+bool basic_filebuf<_CharT, _Traits>::_M_switch_to_output_mode() {
+ if (this->is_open() && (_M_base.__o_mode() & (int)ios_base::out) &&
+ _M_in_input_mode == 0 && _M_in_error_mode == 0) {
+
+ if (!_M_int_buf && !_M_allocate_buffers())
+ return false;
+
+ // In append mode, every write does an implicit seek to the end
+ // of the file. Whenever leaving output mode, the end of file
+ // get put in the initial shift state.
+ if (_M_base.__o_mode() & ios_base::app)
+ _M_state = _State_type();
+
+ this->setp(_M_int_buf, _M_int_buf_EOS - 1);
+ _M_in_output_mode = true;
+ return true;
+ }
+
+ return false;
+}
+
+
+//----------------------------------------
+// Helper functions for input
+
+// This member function is called if there is an error during input.
+// It puts the filebuf in error mode, clear the get area buffer, and
+// returns eof.
+// returns eof. Error mode is sticky; it is cleared only by close or
+// seek.
+
+template <class _CharT, class _Traits>
+__BF_int_type__
+basic_filebuf<_CharT, _Traits>::_M_input_error() {
+ this->_M_exit_input_mode();
+ _M_in_output_mode = false;
+ _M_in_error_mode = true;
+ this->setg(0, 0, 0);
+ return traits_type::eof();
+}
+
+template <class _CharT, class _Traits>
+__BF_int_type__
+basic_filebuf<_CharT, _Traits>::_M_underflow_aux() {
+ // We have the state and file position from the end of the internal
+ // buffer. This round, they become the beginning of the internal buffer.
+ _M_state = _M_end_state;
+
+ // Fill the external buffer. Start with any leftover characters that
+ // didn't get converted last time.
+ if (_M_ext_buf_end > _M_ext_buf_converted)
+
+ _M_ext_buf_end = copy(_M_ext_buf_converted, _M_ext_buf_end, _M_ext_buf);
+ // boris : copy_backward did not work
+ //_M_ext_buf_end = copy_backward(_M_ext_buf_converted, _M_ext_buf_end,
+ //_M_ext_buf+ (_M_ext_buf_end - _M_ext_buf_converted));
+ else
+ _M_ext_buf_end = _M_ext_buf;
+
+ // Now fill the external buffer with characters from the file. This is
+ // a loop because occasionally we don't get enough external characters
+ // to make progress.
+ for (;;) {
+ ptrdiff_t __n = _M_base._M_read(_M_ext_buf_end, _M_ext_buf_EOS - _M_ext_buf_end);
+
+ // Don't enter error mode for a failed read. Error mode is sticky,
+ // and we might succeed if we try again.
+ if (__n <= 0)
+ return traits_type::eof();
+
+ // Convert the external buffer to internal characters.
+ _M_ext_buf_end += __n;
+ const char* __enext;
+ _CharT* __inext;
+
+ typename _Codecvt::result __status
+ = _M_codecvt->in(_M_end_state,
+ _M_ext_buf, _M_ext_buf_end, __enext,
+ _M_int_buf, _M_int_buf_EOS, __inext);
+
+ // Error conditions: (1) Return value of error. (2) Producing internal
+ // characters without consuming external characters. (3) In fixed-width
+ // encodings, producing an internal sequence whose length is inconsistent
+ // with that of the internal sequence. (4) Failure to produce any
+ // characters if we have enough characters in the external buffer, where
+ // "enough" means the largest possible width of a single character.
+ if (__status == _Codecvt::noconv)
+ return _Noconv_input<_Traits>::_M_doit(this);
+ else if (__status == _Codecvt::error ||
+ (__inext != _M_int_buf && __enext == _M_ext_buf) ||
+ (_M_constant_width &&
+ // __inext - _M_int_buf != _M_width * (__enext - _M_ext_buf)) ||
+ (__inext - _M_int_buf) * _M_width != (__enext - _M_ext_buf)) ||
+ (__inext == _M_int_buf && __enext - _M_ext_buf >= _M_max_width))
+ return _M_input_error();
+ else if (__inext != _M_int_buf) {
+ _M_ext_buf_converted = _M_ext_buf + (__enext - _M_ext_buf);
+ this->setg(_M_int_buf, _M_int_buf, __inext);
+ return traits_type::to_int_type(*_M_int_buf);
+ }
+ // We need to go around the loop again to get more external characters.
+ }
+}
+
+//----------------------------------------
+// Helper functions for output
+
+// This member function is called if there is an error during output.
+// It puts the filebuf in error mode, clear the put area buffer, and
+// returns eof. Error mode is sticky; it is cleared only by close or
+// seek.
+template <class _CharT, class _Traits>
+__BF_int_type__
+basic_filebuf<_CharT, _Traits>::_M_output_error() {
+ _M_in_output_mode = false;
+ _M_in_input_mode = false;
+ _M_in_error_mode = true;
+ this->setp(0, 0);
+ return traits_type::eof();
+}
+
+
+// Write whatever sequence of characters is necessary to get back to
+// the initial shift state. This function overwrites the external
+// buffer, changes the external file position, and changes the state.
+// Precondition: the internal buffer is empty.
+template <class _CharT, class _Traits>
+bool basic_filebuf<_CharT, _Traits>::_M_unshift() {
+ if (_M_in_output_mode && !_M_constant_width) {
+ typename _Codecvt::result __status;
+ do {
+ char* __enext = _M_ext_buf;
+ __status = _M_codecvt->unshift(_M_state,
+ _M_ext_buf, _M_ext_buf_EOS, __enext);
+ if (__status == _Codecvt::noconv ||
+ (__enext == _M_ext_buf && __status == _Codecvt::ok))
+ return true;
+ else if (__status == _Codecvt::error)
+ return false;
+ else if (!_M_write(_M_ext_buf, __enext - _M_ext_buf))
+ return false;
+ } while (__status == _Codecvt::partial);
+ }
+
+ return true;
+}
+
+
+//----------------------------------------
+// Helper functions for buffer allocation and deallocation
+
+// This member function is called when we're initializing a filebuf's
+// internal and external buffers. The argument is the size of the
+// internal buffer; the external buffer is sized using the character
+// width in the current encoding. Preconditions: the buffers are currently
+// null. __n >= 1. __buf is either a null pointer or a pointer to an
+// array show size is at least __n.
+
+// We need __n >= 1 for two different reasons. For input, the base
+// class always needs a buffer because of the semantics of underflow().
+// For output, we want to have an internal buffer that's larger by one
+// element than the buffer that the base class knows about. (See
+// basic_filebuf<>::overflow() for the reason.)
+template <class _CharT, class _Traits>
+bool basic_filebuf<_CharT, _Traits>::_M_allocate_buffers(_CharT* __buf, streamsize __n) {
+ //The major hypothesis in the following implementation is that size_t is unsigned.
+ //We also need streamsize byte representation to be larger or equal to the int
+ //representation to correctly store the encoding information.
+ _STLP_STATIC_ASSERT(!numeric_limits<size_t>::is_signed &&
+ sizeof(streamsize) >= sizeof(int))
+
+ if (__buf == 0) {
+ streamsize __bufsize = __n * sizeof(_CharT);
+ //We first check that the streamsize representation can't overflow a size_t one.
+ //If it can, we check that __bufsize is not higher than the size_t max value.
+ if ((sizeof(streamsize) > sizeof(size_t)) &&
+ (__bufsize > __STATIC_CAST(streamsize, (numeric_limits<size_t>::max)())))
+ return false;
+ _M_int_buf = __STATIC_CAST(_CharT*, malloc(__STATIC_CAST(size_t, __bufsize)));
+ if (!_M_int_buf)
+ return false;
+ _M_int_buf_dynamic = true;
+ }
+ else {
+ _M_int_buf = __buf;
+ _M_int_buf_dynamic = false;
+ }
+
+ streamsize __ebufsiz = (max)(__n * __STATIC_CAST(streamsize, _M_width),
+ __STATIC_CAST(streamsize, _M_codecvt->max_length()));
+ _M_ext_buf = 0;
+ if ((sizeof(streamsize) < sizeof(size_t)) ||
+ ((sizeof(streamsize) == sizeof(size_t)) && numeric_limits<streamsize>::is_signed) ||
+ (__ebufsiz <= __STATIC_CAST(streamsize, (numeric_limits<size_t>::max)()))) {
+ _M_ext_buf = __STATIC_CAST(char*, malloc(__STATIC_CAST(size_t, __ebufsiz)));
+ }
+
+ if (!_M_ext_buf) {
+ _M_deallocate_buffers();
+ return false;
+ }
+
+ _M_int_buf_EOS = _M_int_buf + __STATIC_CAST(ptrdiff_t, __n);
+ _M_ext_buf_EOS = _M_ext_buf + __STATIC_CAST(ptrdiff_t, __ebufsiz);
+ return true;
+}
+
+// Abbreviation for the most common case.
+template <class _CharT, class _Traits>
+bool basic_filebuf<_CharT, _Traits>::_M_allocate_buffers() {
+ // Choose a buffer that's at least 4096 characters long and that's a
+ // multiple of the page size.
+ streamsize __default_bufsiz =
+ ((_M_base.__page_size() + 4095UL) / _M_base.__page_size()) * _M_base.__page_size();
+ return _M_allocate_buffers(0, __default_bufsiz);
+}
+
+template <class _CharT, class _Traits>
+void basic_filebuf<_CharT, _Traits>::_M_deallocate_buffers() {
+ if (_M_int_buf_dynamic)
+ free(_M_int_buf);
+ free(_M_ext_buf);
+ _M_int_buf = 0;
+ _M_int_buf_EOS = 0;
+ _M_ext_buf = 0;
+ _M_ext_buf_EOS = 0;
+}
+
+
+//----------------------------------------
+// Helper functiosn for seek and imbue
+
+template <class _CharT, class _Traits>
+bool basic_filebuf<_CharT, _Traits>::_M_seek_init(bool __do_unshift) {
+ // If we're in error mode, leave it.
+ _M_in_error_mode = false;
+
+ // Flush the output buffer if we're in output mode, and (conditionally)
+ // emit an unshift sequence.
+ if (_M_in_output_mode) {
+ bool __ok = !traits_type::eq_int_type(this->overflow(traits_type::eof()),
+ traits_type::eof());
+ if (__do_unshift)
+ __ok = __ok && this->_M_unshift();
+ if (!__ok) {
+ _M_in_output_mode = false;
+ _M_in_error_mode = true;
+ this->setp(0, 0);
+ return false;
+ }
+ }
+
+ // Discard putback characters, if any.
+ if (_M_in_input_mode && _M_in_putback_mode)
+ _M_exit_putback_mode();
+
+ return true;
+}
+
+
+/* Change the filebuf's locale. This member function has no effect
+ * unless it is called before any I/O is performed on the stream.
+ * This function is called on construction and on an imbue call. In the
+ * case of the construction the codecvt facet might be a custom one if
+ * the basic_filebuf user has instanciate it with a custom char_traits.
+ * The user will have to call imbue before any I/O operation.
+ */
+template <class _CharT, class _Traits>
+void basic_filebuf<_CharT, _Traits>::_M_setup_codecvt(const locale& __loc, bool __on_imbue) {
+ if (has_facet<_Codecvt>(__loc)) {
+ _M_codecvt = &use_facet<_Codecvt>(__loc) ;
+ int __encoding = _M_codecvt->encoding();
+
+ _M_width = (max)(__encoding, 1);
+ _M_max_width = _M_codecvt->max_length();
+ _M_constant_width = __encoding > 0;
+ _M_always_noconv = _M_codecvt->always_noconv();
+ }
+ else {
+ _M_codecvt = 0;
+ _M_width = _M_max_width = 1;
+ _M_constant_width = _M_always_noconv = false;
+ if (__on_imbue) {
+ //This call will generate an exception reporting the problem.
+ use_facet<_Codecvt>(__loc);
+ }
+ }
+}
+
+_STLP_END_NAMESPACE
+
+# undef __BF_int_type__
+# undef __BF_pos_type__
+# undef __BF_off_type__
+
+#endif /* _STLP_FSTREAM_C */
+
+// Local Variables:
+// mode:C++
+// End:
projects / polintos / scott / priv.git / blobdiff