#include <bits/c++config.h>
#include <iosfwd>
-#include <cstdio> // For SEEK_SET, SEEK_CUR, SEEK_END
#include <bits/localefwd.h>
#include <bits/ios_base.h>
protected:
/**
* @if maint
- * Pointer to the beginning of internally-allocated space. Filebuf
- * manually allocates/deallocates this, whereas stringstreams attempt
- * to use the built-in intelligence of the string class. If you are
- * managing memory, set this. If not, leave it NULL.
- * @endif
- */
- char_type* _M_buf;
-
- /**
- * @if maint
- * Actual size of allocated internal buffer, in bytes. Unused
- * for sstreams, which have readily available _M_string.capacity().
- * @endif
- */
- size_t _M_buf_size;
-
- /**
- * @if maint
- * Optimal or preferred size of internal buffer, in bytes.
- * @endif
- */
- size_t _M_buf_size_opt;
-
- /**
- * @if maint
* True iff _M_in_* and _M_out_* buffers should always point to
* the same place. True for fstreams, false for sstreams.
* @endif
char_type* _M_out_cur; // Current put area.
char_type* _M_out_end; // End of put area.
+ //@{
+ /**
+ * @if maint
+ * setp (and _M_set_buffer(0) in basic_filebuf) set it equal to
+ * _M_out_beg, then at each put operation it may be moved
+ * forward (toward _M_out_end) by _M_out_cur_move.
+ * @endif
+ */
char_type* _M_out_lim; // End limit of used put area.
//@}
*/
locale _M_buf_locale;
- //@{
- /**
- * @if maint
- * Necessary bits for putback buffer management. Only used in
- * the basic_filebuf class, as necessary for the standard
- * requirements. The only basic_streambuf member function that
- * needs access to these data members is in_avail...
- *
- * @note pbacks of over one character are not currently supported.
- * @endif
- */
- static const size_t _S_pback_size = 1;
- char_type _M_pback[_S_pback_size];
- char_type* _M_pback_cur_save;
- char_type* _M_pback_end_save;
- bool _M_pback_init;
- //@}
-
/**
* @if maint
* Yet unused.
*/
fpos<__state_type> _M_pos;
- // Initializes pback buffers, and moves normal buffers to safety.
- // Assumptions:
- // _M_in_cur has already been moved back
- void
- _M_pback_create()
- {
- if (!_M_pback_init)
- {
- size_t __dist = _M_in_end - _M_in_cur;
- size_t __len = std::min(_S_pback_size, __dist);
- traits_type::copy(_M_pback, _M_in_cur, __len);
- _M_pback_cur_save = _M_in_cur;
- _M_pback_end_save = _M_in_end;
- this->setg(_M_pback, _M_pback, _M_pback + __len);
- _M_pback_init = true;
- }
- }
-
- // Deactivates pback buffer contents, and restores normal buffer.
- // Assumptions:
- // The pback buffer has only moved forward.
- void
- _M_pback_destroy()
- {
- if (_M_pback_init)
- {
- // Length _M_in_cur moved in the pback buffer.
- size_t __off_cur = _M_in_cur - _M_pback;
-
- // For in | out buffers, the end can be pushed back...
- size_t __off_end = 0;
- size_t __pback_len = _M_in_end - _M_pback;
- size_t __save_len = _M_pback_end_save - _M_buf;
- if (__pback_len > __save_len)
- __off_end = __pback_len - __save_len;
-
- this->setg(_M_buf, _M_pback_cur_save + __off_cur,
- _M_pback_end_save + __off_end);
- _M_pback_cur_save = NULL;
- _M_pback_end_save = NULL;
- _M_pback_init = false;
- }
- }
-
// Correctly sets the _M_in_cur pointer, and bumps the
// _M_out_cur pointer as well if necessary.
void
- _M_in_cur_move(off_type __n) // argument needs to be +-
+ _M_move_in_cur(off_type __n) // argument needs to be +-
{
- bool __testout = _M_out_cur;
+ const bool __testout = _M_out_cur;
_M_in_cur += __n;
if (__testout && _M_buf_unified)
_M_out_cur += __n;
// __n + _M_out_[cur, lim] <= _M_out_end
// Assuming all _M_out_[beg, cur, lim] pointers are operating on
// the same range:
- // _M_buf <= _M_*_ <= _M_out_end
+ // _M_out_beg <= _M_*_ <= _M_out_end
void
- _M_out_cur_move(off_type __n) // argument needs to be +-
+ _M_move_out_cur(off_type __n) // argument needs to be +-
{
- bool __testin = _M_in_cur;
+ const bool __testin = _M_in_cur;
_M_out_cur += __n;
if (__testin && _M_buf_unified)
~basic_streambuf()
{
_M_buf_unified = false;
- _M_buf_size = 0;
- _M_buf_size_opt = 0;
_M_mode = ios_base::openmode(0);
}
streamsize
in_avail()
{
- streamsize __ret;
- if (_M_in_cur && _M_in_cur < _M_in_end)
- {
- if (_M_pback_init)
- {
- size_t __save_len = _M_pback_end_save - _M_pback_cur_save;
- size_t __pback_len = _M_in_cur - _M_pback;
- __ret = __save_len - __pback_len;
- }
- else
- __ret = this->egptr() - this->gptr();
- }
- else
- __ret = this->showmanyc();
- return __ret;
+ streamsize __ret = _M_in_end - _M_in_cur;
+ return __ret ? __ret : this->showmanyc();
}
/**
int_type
snextc()
{
- int_type __eof = traits_type::eof();
- return (traits_type::eq_int_type(this->sbumpc(), __eof)
- ? __eof : this->sgetc());
+ int_type __ret = traits_type::eof();
+ if (!traits_type::eq_int_type(this->sbumpc(), __ret))
+ __ret = this->sgetc();
+ return __ret;
}
/**
sgetc()
{
int_type __ret;
- if (_M_in_cur && _M_in_cur < _M_in_end)
- __ret = traits_type::to_int_type(*(this->gptr()));
+ if (_M_in_cur < _M_in_end)
+ __ret = traits_type::to_int_type(*this->_M_in_cur);
else
__ret = this->underflow();
return __ret;
* - this is not an error
*/
basic_streambuf()
- : _M_buf(NULL), _M_buf_size(0), _M_buf_size_opt(BUFSIZ),
- _M_buf_unified(false), _M_in_beg(0), _M_in_cur(0), _M_in_end(0),
- _M_out_beg(0), _M_out_cur(0), _M_out_end(0), _M_out_lim(0),
- _M_mode(ios_base::openmode(0)), _M_buf_locale(locale()),
- _M_pback_cur_save(0), _M_pback_end_save(0),
- _M_pback_init(false)
+ : _M_buf_unified(false), _M_in_beg(0), _M_in_cur(0),
+ _M_in_end(0), _M_out_beg(0), _M_out_cur(0), _M_out_end(0),
+ _M_out_lim(0), _M_mode(ios_base::openmode(0)),
+ _M_buf_locale(locale())
{ }
// [27.5.2.3.1] get area access
_M_in_beg = __gbeg;
_M_in_cur = __gnext;
_M_in_end = __gend;
- if (!(_M_mode & ios_base::in) && __gbeg && __gnext && __gend)
- _M_mode = _M_mode | ios_base::in;
}
// [27.5.2.3.2] put area access
void
setp(char_type* __pbeg, char_type* __pend)
{
- _M_out_beg = _M_out_cur = __pbeg;
- _M_out_end = _M_out_lim = __pend;
- if (!(_M_mode & ios_base::out) && __pbeg && __pend)
- _M_mode = _M_mode | ios_base::out;
+ _M_out_beg = _M_out_cur = _M_out_lim = __pbeg;
+ _M_out_end = __pend;
}
// [27.5.2.4] virtual functions
uflow()
{
int_type __ret = traits_type::eof();
- bool __testeof = traits_type::eq_int_type(this->underflow(), __ret);
- bool __testpending = _M_in_cur && _M_in_cur < _M_in_end;
- if (!__testeof && __testpending)
+ const bool __testeof = traits_type::eq_int_type(this->underflow(),
+ __ret);
+ if (!__testeof && _M_in_cur < _M_in_end)
{
__ret = traits_type::to_int_type(*_M_in_cur);
++_M_in_cur;
- if (_M_buf_unified && _M_mode & ios_base::out)
- ++_M_out_cur;
}
return __ret;
}
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