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Diffstat (limited to 'gcc-4.4.3/libstdc++-v3/include/bits/fstream.tcc')
| -rw-r--r-- | gcc-4.4.3/libstdc++-v3/include/bits/fstream.tcc | 926 |
1 files changed, 926 insertions, 0 deletions
diff --git a/gcc-4.4.3/libstdc++-v3/include/bits/fstream.tcc b/gcc-4.4.3/libstdc++-v3/include/bits/fstream.tcc new file mode 100644 index 000000000..c5f7f8c52 --- /dev/null +++ b/gcc-4.4.3/libstdc++-v3/include/bits/fstream.tcc @@ -0,0 +1,926 @@ +// File based streams -*- C++ -*- + +// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, +// 2007, 2008, 2009 +// 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 3, 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. + +// Under Section 7 of GPL version 3, you are granted additional +// permissions described in the GCC Runtime Library Exception, version +// 3.1, as published by the Free Software Foundation. + +// You should have received a copy of the GNU General Public License and +// a copy of the GCC Runtime Library Exception along with this program; +// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +// <http://www.gnu.org/licenses/>. + +/** @file fstream.tcc + * This is an internal header file, included by other library headers. + * You should not attempt to use it directly. + */ + +// +// ISO C++ 14882: 27.8 File-based streams +// + +#ifndef _FSTREAM_TCC +#define _FSTREAM_TCC 1 + +#pragma GCC system_header + +#include <cxxabi-forced.h> + +_GLIBCXX_BEGIN_NAMESPACE(std) + + template<typename _CharT, typename _Traits> + void + basic_filebuf<_CharT, _Traits>:: + _M_allocate_internal_buffer() + { + // Allocate internal buffer only if one doesn't already exist + // (either allocated or provided by the user via setbuf). + if (!_M_buf_allocated && !_M_buf) + { + _M_buf = new char_type[_M_buf_size]; + _M_buf_allocated = true; + } + } + + template<typename _CharT, typename _Traits> + void + basic_filebuf<_CharT, _Traits>:: + _M_destroy_internal_buffer() throw() + { + if (_M_buf_allocated) + { + delete [] _M_buf; + _M_buf = NULL; + _M_buf_allocated = false; + } + delete [] _M_ext_buf; + _M_ext_buf = NULL; + _M_ext_buf_size = 0; + _M_ext_next = NULL; + _M_ext_end = NULL; + } + + template<typename _CharT, typename _Traits> + basic_filebuf<_CharT, _Traits>:: + basic_filebuf() : __streambuf_type(), _M_lock(), _M_file(&_M_lock), + _M_mode(ios_base::openmode(0)), _M_state_beg(), _M_state_cur(), + _M_state_last(), _M_buf(NULL), _M_buf_size(BUFSIZ), + _M_buf_allocated(false), _M_reading(false), _M_writing(false), _M_pback(), + _M_pback_cur_save(0), _M_pback_end_save(0), _M_pback_init(false), + _M_codecvt(0), _M_ext_buf(0), _M_ext_buf_size(0), _M_ext_next(0), + _M_ext_end(0) + { + if (has_facet<__codecvt_type>(this->_M_buf_locale)) + _M_codecvt = &use_facet<__codecvt_type>(this->_M_buf_locale); + } + + template<typename _CharT, typename _Traits> + 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(); + _M_mode = __mode; + + // Setup initial buffer to 'uncommitted' mode. + _M_reading = false; + _M_writing = false; + _M_set_buffer(-1); + + // Reset to initial state. + _M_state_last = _M_state_cur = _M_state_beg; + + // 27.8.1.3,4 + if ((__mode & ios_base::ate) + && this->seekoff(0, ios_base::end, __mode) + == pos_type(off_type(-1))) + this->close(); + else + __ret = this; + } + } + return __ret; + } + + template<typename _CharT, typename _Traits> + typename basic_filebuf<_CharT, _Traits>::__filebuf_type* + basic_filebuf<_CharT, _Traits>:: + close() + { + if (!this->is_open()) + return NULL; + + bool __testfail = false; + { + // NB: Do this here so that re-opened filebufs will be cool... + struct __close_sentry + { + basic_filebuf *__fb; + __close_sentry (basic_filebuf *__fbi): __fb(__fbi) { } + ~__close_sentry () + { + __fb->_M_mode = ios_base::openmode(0); + __fb->_M_pback_init = false; + __fb->_M_destroy_internal_buffer(); + __fb->_M_reading = false; + __fb->_M_writing = false; + __fb->_M_set_buffer(-1); + __fb->_M_state_last = __fb->_M_state_cur = __fb->_M_state_beg; + } + } __cs (this); + + __try + { + if (!_M_terminate_output()) + __testfail = true; + } + __catch(__cxxabiv1::__forced_unwind&) + { + _M_file.close(); + __throw_exception_again; + } + __catch(...) + { __testfail = true; } + } + + if (!_M_file.close()) + __testfail = true; + + if (__testfail) + return NULL; + else + return this; + } + + template<typename _CharT, typename _Traits> + streamsize + basic_filebuf<_CharT, _Traits>:: + showmanyc() + { + streamsize __ret = -1; + const bool __testin = _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 _GLIBCXX_HAVE_DOS_BASED_FILESYSTEM + // About this workaround, see libstdc++/20806. + const bool __testbinary = _M_mode & ios_base::binary; + if (__check_facet(_M_codecvt).encoding() >= 0 + && __testbinary) +#else + if (__check_facet(_M_codecvt).encoding() >= 0) +#endif + __ret += _M_file.showmanyc() / _M_codecvt->max_length(); + } + return __ret; + } + + template<typename _CharT, typename _Traits> + typename basic_filebuf<_CharT, _Traits>::int_type + basic_filebuf<_CharT, _Traits>:: + underflow() + { + int_type __ret = traits_type::eof(); + const bool __testin = _M_mode & ios_base::in; + if (__testin && !_M_writing) + { + // Check for pback madness, and if so switch 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 = _M_buf_size > 1 ? _M_buf_size - 1 : 1; + + // Will be set to true if ::read() returns 0 indicating EOF. + bool __got_eof = false; + // Number of internal characters produced. + streamsize __ilen = 0; + codecvt_base::result __r = codecvt_base::ok; + if (__check_facet(_M_codecvt).always_noconv()) + { + __ilen = _M_file.xsgetn(reinterpret_cast<char*>(this->eback()), + __buflen); + if (__ilen == 0) + __got_eof = true; + } + else + { + // Worst-case number of external bytes. + // XXX Not done encoding() == -1. + const int __enc = _M_codecvt->encoding(); + streamsize __blen; // Minimum buffer size. + streamsize __rlen; // Number of chars to read. + if (__enc > 0) + __blen = __rlen = __buflen * __enc; + else + { + __blen = __buflen + _M_codecvt->max_length() - 1; + __rlen = __buflen; + } + const streamsize __remainder = _M_ext_end - _M_ext_next; + __rlen = __rlen > __remainder ? __rlen - __remainder : 0; + + // An imbue in 'read' mode implies first converting the external + // chars already present. + if (_M_reading && this->egptr() == this->eback() && __remainder) + __rlen = 0; + + // Allocate buffer if necessary and move unconverted + // bytes to front. + if (_M_ext_buf_size < __blen) + { + char* __buf = new char[__blen]; + if (__remainder) + __builtin_memcpy(__buf, _M_ext_next, __remainder); + + delete [] _M_ext_buf; + _M_ext_buf = __buf; + _M_ext_buf_size = __blen; + } + else if (__remainder) + __builtin_memmove(_M_ext_buf, _M_ext_next, __remainder); + + _M_ext_next = _M_ext_buf; + _M_ext_end = _M_ext_buf + __remainder; + _M_state_last = _M_state_cur; + + do + { + if (__rlen > 0) + { + // Sanity check! + // This may fail if the return value of + // codecvt::max_length() is bogus. + if (_M_ext_end - _M_ext_buf + __rlen > _M_ext_buf_size) + { + __throw_ios_failure(__N("basic_filebuf::underflow " + "codecvt::max_length() " + "is not valid")); + } + streamsize __elen = _M_file.xsgetn(_M_ext_end, __rlen); + if (__elen == 0) + __got_eof = true; + else if (__elen == -1) + break; + _M_ext_end += __elen; + } + + char_type* __iend = this->eback(); + if (_M_ext_next < _M_ext_end) + __r = _M_codecvt->in(_M_state_cur, _M_ext_next, + _M_ext_end, _M_ext_next, + this->eback(), + this->eback() + __buflen, __iend); + if (__r == codecvt_base::noconv) + { + size_t __avail = _M_ext_end - _M_ext_buf; + __ilen = std::min(__avail, __buflen); + traits_type::copy(this->eback(), + reinterpret_cast<char_type*> + (_M_ext_buf), __ilen); + _M_ext_next = _M_ext_buf + __ilen; + } + else + __ilen = __iend - this->eback(); + + // _M_codecvt->in may return error while __ilen > 0: this is + // ok, and actually occurs in case of mixed encodings (e.g., + // XML files). + if (__r == codecvt_base::error) + break; + + __rlen = 1; + } + while (__ilen == 0 && !__got_eof); + } + + if (__ilen > 0) + { + _M_set_buffer(__ilen); + _M_reading = true; + __ret = traits_type::to_int_type(*this->gptr()); + } + else if (__got_eof) + { + // 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; + // However, reaching it while looping on partial means that + // the file has got an incomplete character. + if (__r == codecvt_base::partial) + __throw_ios_failure(__N("basic_filebuf::underflow " + "incomplete character in file")); + } + else if (__r == codecvt_base::error) + __throw_ios_failure(__N("basic_filebuf::underflow " + "invalid byte sequence in file")); + else + __throw_ios_failure(__N("basic_filebuf::underflow " + "error reading the file")); + } + return __ret; + } + + template<typename _CharT, typename _Traits> + typename basic_filebuf<_CharT, _Traits>::int_type + basic_filebuf<_CharT, _Traits>:: + pbackfail(int_type __i) + { + int_type __ret = traits_type::eof(); + const bool __testin = _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 = _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) != pos_type(off_type(-1))) + { + __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; + } + } + return __ret; + } + + template<typename _CharT, typename _Traits> + 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 = _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, + // and output. + if (_M_convert_to_external(this->pbase(), + this->pptr() - this->pbase())) + { + _M_set_buffer(0); + __ret = traits_type::not_eof(__c); + } + } + else if (_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); + } + } + } + return __ret; + } + + template<typename _CharT, typename _Traits> + bool + basic_filebuf<_CharT, _Traits>:: + _M_convert_to_external(_CharT* __ibuf, streamsize __ilen) + { + // Sizes of external and pending output. + streamsize __elen; + streamsize __plen; + if (__check_facet(_M_codecvt).always_noconv()) + { + __elen = _M_file.xsputn(reinterpret_cast<char*>(__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<char*>(__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<char*>(__ibuf); + __blen = __ilen; + } + else + __throw_ios_failure(__N("basic_filebuf::_M_convert_to_external " + "conversion error")); + + __elen = _M_file.xsputn(__buf, __blen); + __plen = __blen; + + // Try once more for partial conversions. + if (__r == codecvt_base::partial && __elen == __plen) + { + 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; + } + else + __throw_ios_failure(__N("basic_filebuf::_M_convert_to_external " + "conversion error")); + } + } + return __elen == __plen; + } + + template<typename _CharT, typename _Traits> + streamsize + basic_filebuf<_CharT, _Traits>:: + xsgetn(_CharT* __s, streamsize __n) + { + // Clear out pback buffer before going on to the real deal... + streamsize __ret = 0; + if (_M_pback_init) + { + if (__n > 0 && this->gptr() == this->eback()) + { + *__s++ = *this->gptr(); + this->gbump(1); + __ret = 1; + --__n; + } + _M_destroy_pback(); + } + + // Optimization in the always_noconv() case, to be generalized in the + // future: when __n > __buflen we read directly instead of using the + // buffer repeatedly. + const bool __testin = _M_mode & ios_base::in; + const streamsize __buflen = _M_buf_size > 1 ? _M_buf_size - 1 : 1; + + if (__n > __buflen && __check_facet(_M_codecvt).always_noconv() + && __testin && !_M_writing) + { + // First, copy the chars already present in the buffer. + const streamsize __avail = this->egptr() - this->gptr(); + if (__avail != 0) + { + if (__avail == 1) + *__s = *this->gptr(); + else + traits_type::copy(__s, this->gptr(), __avail); + __s += __avail; + this->gbump(__avail); + __ret += __avail; + __n -= __avail; + } + + // Need to loop in case of short reads (relatively common + // with pipes). + streamsize __len; + for (;;) + { + __len = _M_file.xsgetn(reinterpret_cast<char*>(__s), + __n); + if (__len == -1) + __throw_ios_failure(__N("basic_filebuf::xsgetn " + "error reading the file")); + if (__len == 0) + break; + + __n -= __len; + __ret += __len; + if (__n == 0) + break; + + __s += __len; + } + + if (__n == 0) + { + _M_set_buffer(0); + _M_reading = true; + } + else if (__len == 0) + { + // If end of file is reached, set 'uncommitted' + // mode, thus allowing an immediate write without + // an intervening seek. + _M_set_buffer(-1); + _M_reading = false; + } + } + else + __ret += __streambuf_type::xsgetn(__s, __n); + + return __ret; + } + + template<typename _CharT, typename _Traits> + streamsize + basic_filebuf<_CharT, _Traits>:: + xsputn(const _CharT* __s, streamsize __n) + { + // Optimization in the always_noconv() case, to be generalized in the + // future: when __n is sufficiently large we write directly instead of + // using the buffer. + streamsize __ret = 0; + const bool __testout = _M_mode & ios_base::out; + if (__check_facet(_M_codecvt).always_noconv() + && __testout && !_M_reading) + { + // Measurement would reveal the best choice. + const streamsize __chunk = 1ul << 10; + streamsize __bufavail = this->epptr() - this->pptr(); + + // Don't mistake 'uncommitted' mode buffered with unbuffered. + if (!_M_writing && _M_buf_size > 1) + __bufavail = _M_buf_size - 1; + + const streamsize __limit = std::min(__chunk, __bufavail); + if (__n >= __limit) + { + const streamsize __buffill = this->pptr() - this->pbase(); + const char* __buf = reinterpret_cast<const char*>(this->pbase()); + __ret = _M_file.xsputn_2(__buf, __buffill, + reinterpret_cast<const char*>(__s), + __n); + if (__ret == __buffill + __n) + { + _M_set_buffer(0); + _M_writing = true; + } + if (__ret > __buffill) + __ret -= __buffill; + else + __ret = 0; + } + else + __ret = __streambuf_type::xsputn(__s, __n); + } + else + __ret = __streambuf_type::xsputn(__s, __n); + return __ret; + } + + template<typename _CharT, typename _Traits> + typename basic_filebuf<_CharT, _Traits>::__streambuf_type* + basic_filebuf<_CharT, _Traits>:: + setbuf(char_type* __s, streamsize __n) + { + if (!this->is_open()) + { + if (__s == 0 && __n == 0) + _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. + _M_buf = __s; + _M_buf_size = __n; + } + } + return this; + } + + + // According to 27.8.1.4 p11 - 13, seekoff should ignore the last + // argument (of type openmode). + template<typename _CharT, typename _Traits> + typename basic_filebuf<_CharT, _Traits>::pos_type + basic_filebuf<_CharT, _Traits>:: + seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode) + { + int __width = 0; + if (_M_codecvt) + __width = _M_codecvt->encoding(); + if (__width < 0) + __width = 0; + + pos_type __ret = pos_type(off_type(-1)); + const bool __testfail = __off != 0 && __width <= 0; + if (this->is_open() && !__testfail) + { + // Ditch any pback buffers to avoid confusion. + _M_destroy_pback(); + + // Correct state at destination. Note that this is the correct + // state for the current position during output, because + // codecvt::unshift() returns the state to the initial state. + // This is also the correct state at the end of the file because + // an unshift sequence should have been written at the end. + __state_type __state = _M_state_beg; + off_type __computed_off = __off * __width; + if (_M_reading && __way == ios_base::cur) + { + if (_M_codecvt->always_noconv()) + __computed_off += this->gptr() - this->egptr(); + else + { + // Calculate offset from _M_ext_buf that corresponds + // to gptr(). Note: uses _M_state_last, which + // corresponds to eback(). + const int __gptr_off = + _M_codecvt->length(_M_state_last, _M_ext_buf, _M_ext_next, + this->gptr() - this->eback()); + __computed_off += _M_ext_buf + __gptr_off - _M_ext_end; + + // _M_state_last is modified by codecvt::length() so + // it now corresponds to gptr(). + __state = _M_state_last; + } + } + __ret = _M_seek(__computed_off, __way, __state); + } + return __ret; + } + + // _GLIBCXX_RESOLVE_LIB_DEFECTS + // 171. Strange seekpos() semantics due to joint position + // According to the resolution of DR 171, seekpos should ignore the last + // argument (of type openmode). + template<typename _CharT, typename _Traits> + typename basic_filebuf<_CharT, _Traits>::pos_type + basic_filebuf<_CharT, _Traits>:: + seekpos(pos_type __pos, ios_base::openmode) + { + pos_type __ret = pos_type(off_type(-1)); + if (this->is_open()) + { + // Ditch any pback buffers to avoid confusion. + _M_destroy_pback(); + __ret = _M_seek(off_type(__pos), ios_base::beg, __pos.state()); + } + return __ret; + } + + template<typename _CharT, typename _Traits> + typename basic_filebuf<_CharT, _Traits>::pos_type + basic_filebuf<_CharT, _Traits>:: + _M_seek(off_type __off, ios_base::seekdir __way, __state_type __state) + { + pos_type __ret = pos_type(off_type(-1)); + if (_M_terminate_output()) + { + // Returns pos_type(off_type(-1)) in case of failure. + __ret = pos_type(_M_file.seekoff(__off, __way)); + if (__ret != pos_type(off_type(-1))) + { + _M_reading = false; + _M_writing = false; + _M_ext_next = _M_ext_end = _M_ext_buf; + _M_set_buffer(-1); + _M_state_cur = __state; + __ret.state(_M_state_cur); + } + } + return __ret; + } + + template<typename _CharT, typename _Traits> + bool + basic_filebuf<_CharT, _Traits>:: + _M_terminate_output() + { + // Part one: update the output sequence. + bool __testvalid = true; + if (this->pbase() < this->pptr()) + { + const int_type __tmp = this->overflow(); + if (traits_type::eq_int_type(__tmp, traits_type::eof())) + __testvalid = false; + } + + // Part two: output unshift sequence. + if (_M_writing && !__check_facet(_M_codecvt).always_noconv() + && __testvalid) + { + // Note: this value is arbitrary, since there is no way to + // get the length of the unshift sequence from codecvt, + // without calling unshift. + const size_t __blen = 128; + char __buf[__blen]; + codecvt_base::result __r; + streamsize __ilen = 0; + + do + { + char* __next; + __r = _M_codecvt->unshift(_M_state_cur, __buf, + __buf + __blen, __next); + if (__r == codecvt_base::error) + __testvalid = false; + else if (__r == codecvt_base::ok || + __r == codecvt_base::partial) + { + __ilen = __next - __buf; + if (__ilen > 0) + { + const streamsize __elen = _M_file.xsputn(__buf, __ilen); + if (__elen != __ilen) + __testvalid = false; + } + } + } + while (__r == codecvt_base::partial && __ilen > 0 && __testvalid); + + if (__testvalid) + { + // This second call to overflow() is required by the standard, + // but it's not clear why it's needed, since the output buffer + // should be empty by this point (it should have been emptied + // in the first call to overflow()). + const int_type __tmp = this->overflow(); + if (traits_type::eq_int_type(__tmp, traits_type::eof())) + __testvalid = false; + } + } + return __testvalid; + } + + template<typename _CharT, typename _Traits> + int + basic_filebuf<_CharT, _Traits>:: + sync() + { + // Make sure that the internal buffer resyncs its idea of + // the file position with the external file. + int __ret = 0; + if (this->pbase() < this->pptr()) + { + const int_type __tmp = this->overflow(); + if (traits_type::eq_int_type(__tmp, traits_type::eof())) + __ret = -1; + } + return __ret; + } + + template<typename _CharT, typename _Traits> + void + basic_filebuf<_CharT, _Traits>:: + imbue(const locale& __loc) + { + bool __testvalid = true; + + const __codecvt_type* _M_codecvt_tmp = 0; + if (__builtin_expect(has_facet<__codecvt_type>(__loc), true)) + _M_codecvt_tmp = &use_facet<__codecvt_type>(__loc); + + if (this->is_open()) + { + // encoding() == -1 is ok only at the beginning. + if ((_M_reading || _M_writing) + && __check_facet(_M_codecvt).encoding() == -1) + __testvalid = false; + else + { + if (_M_reading) + { + if (__check_facet(_M_codecvt).always_noconv()) + { + if (_M_codecvt_tmp + && !__check_facet(_M_codecvt_tmp).always_noconv()) + __testvalid = this->seekoff(0, ios_base::cur, _M_mode) + != pos_type(off_type(-1)); + } + else + { + // External position corresponding to gptr(). + _M_ext_next = _M_ext_buf + + _M_codecvt->length(_M_state_last, _M_ext_buf, _M_ext_next, + this->gptr() - this->eback()); + const streamsize __remainder = _M_ext_end - _M_ext_next; + if (__remainder) + __builtin_memmove(_M_ext_buf, _M_ext_next, __remainder); + + _M_ext_next = _M_ext_buf; + _M_ext_end = _M_ext_buf + __remainder; + _M_set_buffer(-1); + _M_state_last = _M_state_cur = _M_state_beg; + } + } + else if (_M_writing && (__testvalid = _M_terminate_output())) + _M_set_buffer(-1); + } + } + + if (__testvalid) + _M_codecvt = _M_codecvt_tmp; + else + _M_codecvt = 0; + } + + // 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<char>; + extern template class basic_ifstream<char>; + extern template class basic_ofstream<char>; + extern template class basic_fstream<char>; + +#ifdef _GLIBCXX_USE_WCHAR_T + extern template class basic_filebuf<wchar_t>; + extern template class basic_ifstream<wchar_t>; + extern template class basic_ofstream<wchar_t>; + extern template class basic_fstream<wchar_t>; +#endif +#endif + +_GLIBCXX_END_NAMESPACE + +#endif |