// File based streams -*- C++ -*- // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003 // Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 2, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License along // with this library; see the file COPYING. If not, write to the Free // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, // USA. // As a special exception, you may use this file as part of a free software // library without restriction. Specifically, if other files instantiate // templates or use macros or inline functions from this file, or you compile // this file and link it with other files to produce an executable, this // file does not by itself cause the resulting executable to be covered by // the GNU General Public License. This exception does not however // invalidate any other reasons why the executable file might be covered by // the GNU General Public License. // // ISO C++ 14882: 27.8 File-based streams // #ifndef _FSTREAM_TCC #define _FSTREAM_TCC 1 #pragma GCC system_header namespace std { template void basic_filebuf<_CharT, _Traits>:: _M_allocate_internal_buffer() { if (!_M_buf_allocated && this->_M_buf_size) { // Allocate internal buffer. this->_M_buf = new char_type[this->_M_buf_size]; _M_buf_allocated = true; } } // Both close and setbuf need to deallocate internal buffers, if it exists. template void basic_filebuf<_CharT, _Traits>:: _M_destroy_internal_buffer() throw() { if (_M_buf_allocated) { delete [] this->_M_buf; this->_M_buf = NULL; _M_buf_allocated = false; } } template basic_filebuf<_CharT, _Traits>:: basic_filebuf() : __streambuf_type(), _M_file(&_M_lock), _M_mode(ios_base::openmode(0)), _M_state_cur(__state_type()), _M_state_beg(__state_type()), _M_buf(NULL), _M_buf_size(BUFSIZ), _M_buf_allocated(false), _M_reading(false), _M_writing(false), _M_last_overflowed(false), _M_pback_cur_save(0), _M_pback_end_save(0), _M_pback_init(false), _M_codecvt(0) { if (has_facet<__codecvt_type>(this->_M_buf_locale)) _M_codecvt = &use_facet<__codecvt_type>(this->_M_buf_locale); } template typename basic_filebuf<_CharT, _Traits>::__filebuf_type* basic_filebuf<_CharT, _Traits>:: open(const char* __s, ios_base::openmode __mode) { __filebuf_type *__ret = NULL; if (!this->is_open()) { _M_file.open(__s, __mode); if (this->is_open()) { _M_allocate_internal_buffer(); this->_M_mode = __mode; // Setup initial buffer to 'uncommitted' mode. _M_reading = false; _M_writing = false; _M_set_buffer(-1); // 27.8.1.3,4 if ((__mode & ios_base::ate) && this->seekoff(0, ios_base::end, __mode) < 0) this->close(); else __ret = this; } } return __ret; } template typename basic_filebuf<_CharT, _Traits>::__filebuf_type* basic_filebuf<_CharT, _Traits>:: close() throw() { __filebuf_type* __ret = NULL; if (this->is_open()) { bool __testfail = false; try { if (this->pbase() < this->pptr() && traits_type::eq_int_type(this->overflow(), traits_type::eof())) __testfail = true; #if 0 // XXX not done if (_M_last_overflowed) { _M_output_unshift(); this->overflow(); } #endif } catch(...) { __testfail = true; } // NB: Do this here so that re-opened filebufs will be cool... this->_M_mode = ios_base::openmode(0); this->_M_pback_init = false; _M_destroy_internal_buffer(); _M_reading = false; _M_writing = false; _M_set_buffer(-1); if (!_M_file.close()) __testfail = true; if (!__testfail) __ret = this; } _M_last_overflowed = false; return __ret; } template streamsize basic_filebuf<_CharT, _Traits>:: showmanyc() { streamsize __ret = -1; const bool __testin = this->_M_mode & ios_base::in; if (__testin && this->is_open()) { // For a stateful encoding (-1) the pending sequence might be just // shift and unshift prefixes with no actual character. __ret = this->egptr() - this->gptr(); if (__check_facet(_M_codecvt).encoding() >= 0) __ret += _M_file.showmanyc() / _M_codecvt->max_length(); } _M_last_overflowed = false; return __ret; } template typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>:: underflow() { int_type __ret = traits_type::eof(); const bool __testin = this->_M_mode & ios_base::in; const bool __testout = this->_M_mode & ios_base::out; if (__testin && !_M_writing) { // Check for pback madness, and if so swich back to the // normal buffers and jet outta here before expensive // fileops happen... _M_destroy_pback(); if (this->gptr() < this->egptr()) return traits_type::to_int_type(*this->gptr()); // Get and convert input sequence. const size_t __buflen = this->_M_buf_size > 1 ? this->_M_buf_size - 1 : 1; streamsize __elen = 0; streamsize __ilen = 0; if (__check_facet(_M_codecvt).always_noconv()) { __elen = _M_file.xsgetn(reinterpret_cast(this->eback()), __buflen); __ilen = __elen; } else { // Worst-case number of external bytes. // XXX Not done encoding() == -1. const int __enc = _M_codecvt->encoding(); const streamsize __blen = __enc > 0 ? __buflen * __enc : __buflen; char* __buf = static_cast(__builtin_alloca(__blen)); __elen = _M_file.xsgetn(__buf, __blen); const char* __eend; char_type* __iend; codecvt_base::result __r; __r = _M_codecvt->in(_M_state_cur, __buf, __buf + __elen, __eend, this->eback(), this->eback() + __buflen, __iend); if (__r == codecvt_base::ok || __r == codecvt_base::partial) __ilen = __iend - this->eback(); else if (__r == codecvt_base::noconv) { traits_type::copy(this->eback(), reinterpret_cast(__buf), __elen); __ilen = __elen; } else { // Unwind. __ilen = 0; _M_file.seekoff(-__elen, ios_base::cur, ios_base::in); } } if (__ilen > 0) { _M_set_buffer(__ilen); _M_reading = true; __ret = traits_type::to_int_type(*this->gptr()); } else if (__elen == 0) { // If the actual end of file is reached, set 'uncommitted' // mode, thus allowing an immediate write without an // intervening seek. _M_set_buffer(-1); _M_reading = false; } } _M_last_overflowed = false; return __ret; } template typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>:: pbackfail(int_type __i) { int_type __ret = traits_type::eof(); const bool __testin = this->_M_mode & ios_base::in; if (__testin && !_M_writing) { // Remember whether the pback buffer is active, otherwise below // we may try to store in it a second char (libstdc++/9761). const bool __testpb = this->_M_pback_init; const bool __testeof = traits_type::eq_int_type(__i, __ret); int_type __tmp; if (this->eback() < this->gptr()) { this->gbump(-1); __tmp = traits_type::to_int_type(*this->gptr()); } else if (this->seekoff(-1, ios_base::cur) >= 0) { __tmp = this->underflow(); if (traits_type::eq_int_type(__tmp, __ret)) return __ret; } else { // At the beginning of the buffer, need to make a // putback position available. But the seek may fail // (f.i., at the beginning of a file, see // libstdc++/9439) and in that case we return // traits_type::eof(). return __ret; } // Try to put back __i into input sequence in one of three ways. // Order these tests done in is unspecified by the standard. if (!__testeof && traits_type::eq_int_type(__i, __tmp)) __ret = __i; else if (__testeof) __ret = traits_type::not_eof(__i); else if (!__testpb) { _M_create_pback(); _M_reading = true; *this->gptr() = traits_type::to_char_type(__i); __ret = __i; } } _M_last_overflowed = false; return __ret; } template typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>:: overflow(int_type __c) { int_type __ret = traits_type::eof(); const bool __testeof = traits_type::eq_int_type(__c, __ret); const bool __testout = this->_M_mode & ios_base::out; if (__testout && !_M_reading) { if (this->pbase() < this->pptr()) { // If appropriate, append the overflow char. if (!__testeof) { *this->pptr() = traits_type::to_char_type(__c); this->pbump(1); } // Convert pending sequence to external representation, // output. if (_M_convert_to_external(this->pbase(), this->pptr() - this->pbase()) && (!__testeof || (__testeof && !_M_file.sync()))) { _M_set_buffer(0); __ret = traits_type::not_eof(__c); } } else if (this->_M_buf_size > 1) { // Overflow in 'uncommitted' mode: set _M_writing, set // the buffer to the initial 'write' mode, and put __c // into the buffer. _M_set_buffer(0); _M_writing = true; if (!__testeof) { *this->pptr() = traits_type::to_char_type(__c); this->pbump(1); } __ret = traits_type::not_eof(__c); } else { // Unbuffered. char_type __conv = traits_type::to_char_type(__c); if (__testeof || _M_convert_to_external(&__conv, 1)) { _M_writing = true; __ret = traits_type::not_eof(__c); } } } _M_last_overflowed = true; return __ret; } template bool basic_filebuf<_CharT, _Traits>:: _M_convert_to_external(_CharT* __ibuf, streamsize __ilen) { // Sizes of external and pending output. streamsize __elen = 0; streamsize __plen = 0; if (__check_facet(_M_codecvt).always_noconv()) { __elen += _M_file.xsputn(reinterpret_cast(__ibuf), __ilen); __plen += __ilen; } else { // Worst-case number of external bytes needed. // XXX Not done encoding() == -1. streamsize __blen = __ilen * _M_codecvt->max_length(); char* __buf = static_cast(__builtin_alloca(__blen)); char* __bend; const char_type* __iend; codecvt_base::result __r; __r = _M_codecvt->out(_M_state_cur, __ibuf, __ibuf + __ilen, __iend, __buf, __buf + __blen, __bend); if (__r == codecvt_base::ok || __r == codecvt_base::partial) __blen = __bend - __buf; else if (__r == codecvt_base::noconv) { // Same as the always_noconv case above. __buf = reinterpret_cast(__ibuf); __blen = __ilen; } else { // Result == error. __blen = 0; } if (__blen) { __elen += _M_file.xsputn(__buf, __blen); __plen += __blen; } // Try once more for partial conversions. if (__r == codecvt_base::partial) { const char_type* __iresume = __iend; streamsize __rlen = this->pptr() - __iend; __r = _M_codecvt->out(_M_state_cur, __iresume, __iresume + __rlen, __iend, __buf, __buf + __blen, __bend); if (__r != codecvt_base::error) { __rlen = __bend - __buf; __elen += _M_file.xsputn(__buf, __rlen); __plen += __rlen; } } } return __elen && __elen == __plen; } template typename basic_filebuf<_CharT, _Traits>::__streambuf_type* basic_filebuf<_CharT, _Traits>:: setbuf(char_type* __s, streamsize __n) { if (!this->is_open() && __s == 0 && __n == 0) this->_M_buf_size = 1; else if (__s && __n > 0) { // This is implementation-defined behavior, and assumes that // an external char_type array of length __n exists and has // been pre-allocated. If this is not the case, things will // quickly blow up. When __n > 1, __n - 1 positions will be // used for the get area, __n - 1 for the put area and 1 // position to host the overflow char of a full put area. // When __n == 1, 1 position will be used for the get area // and 0 for the put area, as in the unbuffered case above. // Step 1: Destroy the current internal array. _M_destroy_internal_buffer(); // Step 2: Use the external array. this->_M_buf = __s; this->_M_buf_size = __n; _M_reading = false; _M_writing = false; _M_set_buffer(-1); } _M_last_overflowed = false; return this; } template typename basic_filebuf<_CharT, _Traits>::pos_type basic_filebuf<_CharT, _Traits>:: seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode) { pos_type __ret = pos_type(off_type(-1)); const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0; const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0; int __width = 0; if (_M_codecvt) __width = _M_codecvt->encoding(); if (__width < 0) __width = 0; const bool __testfail = __off != 0 && __width <= 0; if (this->is_open() && !__testfail && (__testin || __testout)) { // Ditch any pback buffers to avoid confusion. _M_destroy_pback(); off_type __computed_off = __off; if (this->pbase() < this->pptr()) { // Part one: update the output sequence. this->sync(); // Part two: output unshift sequence. _M_output_unshift(); } else if (_M_reading && __way == ios_base::cur) __computed_off += this->gptr() - this->egptr(); // Returns pos_type(off_type(-1)) in case of failure. __ret = _M_file.seekoff(__computed_off * __width, __way, __mode); _M_reading = false; _M_writing = false; _M_set_buffer(-1); } _M_last_overflowed = false; return __ret; } template typename basic_filebuf<_CharT, _Traits>::pos_type basic_filebuf<_CharT, _Traits>:: seekpos(pos_type __pos, ios_base::openmode __mode) { #ifdef _GLIBCXX_RESOLVE_LIB_DEFECTS // 171. Strange seekpos() semantics due to joint position pos_type __ret = pos_type(off_type(-1)); int __width = 0; if (_M_codecvt) __width = _M_codecvt->encoding(); if (__width > 0) __ret = this->seekoff(off_type(__pos) / __width, ios_base::beg, __mode); return __ret; #endif } template void basic_filebuf<_CharT, _Traits>:: _M_output_unshift() { } template void basic_filebuf<_CharT, _Traits>:: imbue(const locale& __loc) { const bool __testbeg = !this->seekoff(0, ios_base::cur, this->_M_mode); const bool __teststate = __check_facet(_M_codecvt).encoding() == -1; if (this->_M_buf_locale != __loc && (!this->is_open() || (__testbeg && !__teststate))) { this->_M_buf_locale = __loc; if (__builtin_expect(has_facet<__codecvt_type>(__loc), true)) _M_codecvt = &use_facet<__codecvt_type>(__loc); // NB This may require the reconversion of previously // converted chars. This in turn may cause the // reconstruction of the original file. YIKES!! This // implementation interprets this requirement as requiring // the file position be at the beginning, and a stateless // encoding, or that the filebuf be closed. Opinions may differ. } _M_last_overflowed = false; } // Inhibit implicit instantiations for required instantiations, // which are defined via explicit instantiations elsewhere. // NB: This syntax is a GNU extension. #if _GLIBCXX_EXTERN_TEMPLATE extern template class basic_filebuf; extern template class basic_ifstream; extern template class basic_ofstream; extern template class basic_fstream; #ifdef _GLIBCXX_USE_WCHAR_T extern template class basic_filebuf; extern template class basic_ifstream; extern template class basic_ofstream; extern template class basic_fstream; #endif #endif } // namespace std #endif