diff options
Diffstat (limited to 'stlport/stl/_fstream.c')
| -rw-r--r-- | stlport/stl/_fstream.c | 766 |
1 files changed, 0 insertions, 766 deletions
diff --git a/stlport/stl/_fstream.c b/stlport/stl/_fstream.c deleted file mode 100644 index 7306f9e..0000000 --- a/stlport/stl/_fstream.c +++ /dev/null @@ -1,766 +0,0 @@ -/* - * 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_mmap_base = 0; - _M_mmap_len = 0; - } - _M_in_input_mode = false; -} - - -//---------------------------------------------------------------------- -// 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; -} - -#if defined (_STLP_ASSERTIONS) -// helper class. -template <class _CharT> -struct _Filebuf_Tmp_Buf { - _CharT* _M_ptr; - _Filebuf_Tmp_Buf(ptrdiff_t __n) : _M_ptr(0) { _M_ptr = new _CharT[__n]; } - ~_Filebuf_Tmp_Buf() { delete[] _M_ptr; } -}; -#endif - -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()) - return pos_type(-1); - - if (!_M_constant_width && __off != 0) - return pos_type(-1); - - 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. - _STLP_ASSERT(__whence == ios_base::cur) - if (!_M_in_input_mode) - return _M_seek_return(_M_base._M_seek(_M_width * __off, __whence), - _State_type()); - - 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()); - } - - 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_converted, - __ipos); -#if defined (_STLP_ASSERTIONS) - // Sanity check (expensive): make sure __epos is the right answer. - _STLP_ASSERT(__epos >= 0) - _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); - // The result code is necessarily ok because: - // - noconv: impossible for a variable encoding - // - error: length method is supposed to count until it reach max value or find an error so we cannot have - // an error again when decoding an external buffer up to length return value. - // - partial: idem error, it is also a reason for length to stop counting. - _STLP_ASSERT(__status == _Codecvt::ok) - _STLP_ASSERT(__inext == __ibegin + __ipos) - _STLP_ASSERT(equal(this->eback(), this->gptr(), __ibegin, _STLP_PRIV _Eq_traits<traits_type>())) -#endif - // 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 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 = _STLP_STD::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); - if (__n < 0) { - // Read failed, maybe we should set err bit on associated stream... - this->setg(0, 0, 0); - return traits_type::eof(); - } - - _M_ext_buf_end += __n; - - // If external buffer is empty there is nothing to do. - if (_M_ext_buf == _M_ext_buf_end) { - this->setg(0, 0, 0); - return traits_type::eof(); - } - - // Convert the external buffer to internal characters. - 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 && __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. - * But if the previous read failed then don't try again for now. - * Don't enter error mode for a failed read. Error mode is sticky, - * and we might succeed if we try again. */ - if (__n <= 0) { - this->setg(0, 0, 0); - return traits_type::eof(); - } - } -} - -//---------------------------------------- -// 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: |