314 lines
13 KiB
C++
314 lines
13 KiB
C++
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// ----------------------------------------------------------------------------
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// alt_sstream_impl.hpp : alternative stringstream, templates implementation
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// ----------------------------------------------------------------------------
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// Copyright Samuel Krempp 2003. Use, modification, and distribution are
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// subject to the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/format for library home page
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// ----------------------------------------------------------------------------
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#ifndef BOOST_SK_ALT_SSTREAM_IMPL_HPP
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#define BOOST_SK_ALT_SSTREAM_IMPL_HPP
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namespace boost {
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namespace io {
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// --- Implementation ------------------------------------------------------//
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template<class Ch, class Tr, class Alloc>
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void basic_altstringbuf<Ch, Tr, Alloc>::
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clear_buffer () {
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const Ch * p = pptr();
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const Ch * b = pbase();
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if(p != NULL && p != b) {
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seekpos(0, ::std::ios_base::out);
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}
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p = gptr();
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b = eback();
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if(p != NULL && p != b) {
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seekpos(0, ::std::ios_base::in);
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}
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}
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template<class Ch, class Tr, class Alloc>
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void basic_altstringbuf<Ch, Tr, Alloc>::
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str (const string_type& s) {
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size_type sz=s.size();
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if(sz != 0 && mode_ & (::std::ios_base::in | ::std::ios_base::out) ) {
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#ifdef _RWSTD_NO_CLASS_PARTIAL_SPEC
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void *vd_ptr = alloc_.allocate(sz, is_allocated_? eback() : 0);
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Ch *new_ptr = static_cast<Ch *>(vd_ptr);
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#else
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Ch *new_ptr = alloc_.allocate(sz, is_allocated_? eback() : 0);
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#endif
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// if this didnt throw, we're safe, update the buffer
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dealloc();
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sz = s.copy(new_ptr, sz);
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putend_ = new_ptr + sz;
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if(mode_ & ::std::ios_base::in)
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streambuf_t::setg(new_ptr, new_ptr, new_ptr + sz);
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if(mode_ & ::std::ios_base::out) {
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streambuf_t::setp(new_ptr, new_ptr + sz);
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if(mode_ & (::std::ios_base::app | ::std::ios_base::ate))
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streambuf_t::pbump(static_cast<int>(sz));
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if(gptr() == NULL)
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streambuf_t::setg(new_ptr, NULL, new_ptr);
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}
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is_allocated_ = true;
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}
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else
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dealloc();
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}
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template<class Ch, class Tr, class Alloc>
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Ch* basic_altstringbuf<Ch, Tr, Alloc>::
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begin () const {
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if(mode_ & ::std::ios_base::out && pptr() != NULL)
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return pbase();
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else if(mode_ & ::std::ios_base::in && gptr() != NULL)
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return eback();
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return NULL;
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}
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template<class Ch, class Tr, class Alloc>
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typename std::basic_string<Ch,Tr,Alloc>::size_type
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basic_altstringbuf<Ch, Tr, Alloc>::
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size () const {
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if(mode_ & ::std::ios_base::out && pptr())
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return static_cast<size_type>(pend() - pbase());
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else if(mode_ & ::std::ios_base::in && gptr())
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return static_cast<size_type>(egptr() - eback());
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else
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return 0;
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}
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template<class Ch, class Tr, class Alloc>
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typename std::basic_string<Ch,Tr,Alloc>::size_type
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basic_altstringbuf<Ch, Tr, Alloc>::
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cur_size () const {
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if(mode_ & ::std::ios_base::out && pptr())
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return static_cast<streamsize>( pptr() - pbase());
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else if(mode_ & ::std::ios_base::in && gptr())
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return static_cast<streamsize>( gptr() - eback());
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else
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return 0;
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}
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template<class Ch, class Tr, class Alloc>
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typename basic_altstringbuf<Ch, Tr, Alloc>::pos_type
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basic_altstringbuf<Ch, Tr, Alloc>::
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seekoff (off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which) {
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if(pptr() != NULL && putend_ < pptr())
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putend_ = pptr();
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if(which & ::std::ios_base::in && gptr() != NULL) {
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// get area
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if(way == ::std::ios_base::end)
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off += static_cast<off_type>(putend_ - gptr());
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else if(way == ::std::ios_base::beg)
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off += static_cast<off_type>(eback() - gptr());
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else if(way != ::std::ios_base::cur || (which & ::std::ios_base::out) )
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// (altering in&out is only supported if way is beg or end, not cur)
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return pos_type(off_type(-1));
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if(eback() <= off+gptr() && off+gptr() <= putend_ ) {
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// set gptr
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streambuf_t::gbump(static_cast<int>(off));
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if(which & ::std::ios_base::out && pptr() != NULL)
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// update pptr to match gptr
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streambuf_t::pbump(static_cast<int>(gptr()-pptr()));
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}
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else
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off = off_type(-1);
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}
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else if(which & ::std::ios_base::out && pptr() != NULL) {
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// put area
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if(way == ::std::ios_base::end)
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off += static_cast<off_type>(putend_ - pptr());
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else if(way == ::std::ios_base::beg)
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off += static_cast<off_type>(pbase() - pptr());
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else if(way != ::std::ios_base::beg)
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return pos_type(off_type(-1));
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if(pbase() <= off+pptr() && off+pptr() <= putend_)
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// set pptr
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streambuf_t::pbump(static_cast<int>(off));
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else
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off = off_type(-1);
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}
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else // neither in nor out
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off = off_type(-1);
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return (pos_type(off));
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}
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//- end seekoff(..)
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template<class Ch, class Tr, class Alloc>
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typename basic_altstringbuf<Ch, Tr, Alloc>::pos_type
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basic_altstringbuf<Ch, Tr, Alloc>::
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seekpos (pos_type pos, ::std::ios_base::openmode which) {
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off_type off = off_type(pos); // operation guaranteed by 27.4.3.2 table 88
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if(pptr() != NULL && putend_ < pptr())
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putend_ = pptr();
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if(off != off_type(-1)) {
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if(which & ::std::ios_base::in && gptr() != NULL) {
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// get area
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if(0 <= off && off <= putend_ - eback()) {
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streambuf_t::gbump(static_cast<int>(eback() - gptr() + off));
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if(which & ::std::ios_base::out && pptr() != NULL) {
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// update pptr to match gptr
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streambuf_t::pbump(static_cast<int>(gptr()-pptr()));
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}
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}
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else
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off = off_type(-1);
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}
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else if(which & ::std::ios_base::out && pptr() != NULL) {
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// put area
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if(0 <= off && off <= putend_ - eback())
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streambuf_t::pbump(static_cast<int>(eback() - pptr() + off));
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else
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off = off_type(-1);
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}
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else // neither in nor out
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off = off_type(-1);
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return (pos_type(off));
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}
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else {
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BOOST_ASSERT(0); // <20>27.4.3.2 allows undefined-behaviour here
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return pos_type(off_type(-1));
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}
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}
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// -end seekpos(..)
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template<class Ch, class Tr, class Alloc>
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typename basic_altstringbuf<Ch, Tr, Alloc>::int_type
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basic_altstringbuf<Ch, Tr, Alloc>::
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underflow () {
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if(gptr() == NULL) // no get area -> nothing to get.
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return (compat_traits_type::eof());
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else if(gptr() < egptr()) // ok, in buffer
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return (compat_traits_type::to_int_type(*gptr()));
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else if(mode_ & ::std::ios_base::in && pptr() != NULL
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&& (gptr() < pptr() || gptr() < putend_) )
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{ // expand get area
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if(putend_ < pptr())
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putend_ = pptr(); // remember pptr reached this far
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streambuf_t::setg(eback(), gptr(), putend_);
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return (compat_traits_type::to_int_type(*gptr()));
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}
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else // couldnt get anything. EOF.
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return (compat_traits_type::eof());
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}
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// -end underflow(..)
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template<class Ch, class Tr, class Alloc>
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typename basic_altstringbuf<Ch, Tr, Alloc>::int_type
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basic_altstringbuf<Ch, Tr, Alloc>::
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pbackfail (int_type meta) {
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if(gptr() != NULL && (eback() < gptr())
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&& (mode_ & (::std::ios_base::out)
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|| compat_traits_type::eq_int_type(compat_traits_type::eof(), meta)
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|| compat_traits_type::eq(compat_traits_type::to_char_type(meta), gptr()[-1]) ) ) {
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streambuf_t::gbump(-1); // back one character
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if(!compat_traits_type::eq_int_type(compat_traits_type::eof(), meta))
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// put-back meta into get area
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*gptr() = compat_traits_type::to_char_type(meta);
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return (compat_traits_type::not_eof(meta));
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}
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else
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return (compat_traits_type::eof()); // failed putback
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}
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// -end pbackfail(..)
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template<class Ch, class Tr, class Alloc>
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typename basic_altstringbuf<Ch, Tr, Alloc>::int_type
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basic_altstringbuf<Ch, Tr, Alloc>::
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overflow (int_type meta) {
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#ifdef BOOST_MSVC
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#pragma warning(push)
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#pragma warning(disable:4996)
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#endif
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if(compat_traits_type::eq_int_type(compat_traits_type::eof(), meta))
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return compat_traits_type::not_eof(meta); // nothing to do
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else if(pptr() != NULL && pptr() < epptr()) {
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streambuf_t::sputc(compat_traits_type::to_char_type(meta));
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return meta;
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}
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else if(! (mode_ & ::std::ios_base::out))
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// no write position, and cant make one
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return compat_traits_type::eof();
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else { // make a write position available
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std::size_t prev_size = pptr() == NULL ? 0 : epptr() - eback();
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std::size_t new_size = prev_size;
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// exponential growth : size *= 1.5
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std::size_t add_size = new_size / 2;
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if(add_size < alloc_min)
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add_size = alloc_min;
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Ch * newptr = NULL, *oldptr = eback();
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// make sure adding add_size wont overflow size_t
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while (0 < add_size && ((std::numeric_limits<std::size_t>::max)()
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- add_size < new_size) )
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add_size /= 2;
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if(0 < add_size) {
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new_size += add_size;
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#ifdef _RWSTD_NO_CLASS_PARTIAL_SPEC
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void *vdptr = alloc_.allocate(new_size, is_allocated_? oldptr : 0);
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newptr = static_cast<Ch *>(vdptr);
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#else
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newptr = alloc_.allocate(new_size, is_allocated_? oldptr : 0);
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#endif
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}
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if(0 < prev_size)
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compat_traits_type::copy(newptr, oldptr, prev_size);
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if(is_allocated_)
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alloc_.deallocate(oldptr, prev_size);
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is_allocated_=true;
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if(prev_size == 0) { // first allocation
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putend_ = newptr;
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streambuf_t::setp(newptr, newptr + new_size);
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if(mode_ & ::std::ios_base::in)
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streambuf_t::setg(newptr, newptr, newptr + 1);
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else
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streambuf_t::setg(newptr, 0, newptr);
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}
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else { // update pointers
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putend_ = putend_ - oldptr + newptr;
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int pptr_count = static_cast<int>(pptr()-pbase());
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int gptr_count = static_cast<int>(gptr()-eback());
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streambuf_t::setp(pbase() - oldptr + newptr, newptr + new_size);
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streambuf_t::pbump(pptr_count);
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if(mode_ & ::std::ios_base::in)
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streambuf_t::setg(newptr, newptr + gptr_count, pptr() + 1);
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else
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streambuf_t::setg(newptr, 0, newptr);
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}
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streambuf_t::sputc(compat_traits_type::to_char_type(meta));
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return meta;
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}
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#ifdef BOOST_MSVC
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#pragma warning(pop)
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#endif
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}
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// -end overflow(..)
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template<class Ch, class Tr, class Alloc>
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void basic_altstringbuf<Ch, Tr, Alloc>:: dealloc() {
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if(is_allocated_)
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alloc_.deallocate(eback(), (pptr() != NULL ? epptr() : egptr()) - eback());
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is_allocated_ = false;
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streambuf_t::setg(0, 0, 0);
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streambuf_t::setp(0, 0);
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putend_ = NULL;
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}
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}// N.S. io
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} // N.S. boost
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#endif // include guard
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