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alt_sstream_impl.hpp
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// ----------------------------------------------------------------------------
// alt_sstream_impl.hpp : alternative stringstream, templates implementation
// ----------------------------------------------------------------------------
// Copyright Samuel Krempp 2003. Use, modification, and distribution are
// subject to the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/format for library home page
// ----------------------------------------------------------------------------
#ifndef BOOST_SK_ALT_SSTREAM_IMPL_HPP
#define BOOST_SK_ALT_SSTREAM_IMPL_HPP
namespace boost {
namespace io {
// --- Implementation ------------------------------------------------------//
template<class Ch, class Tr, class Alloc>
void basic_altstringbuf<Ch, Tr, Alloc>::
clear_buffer () {
const Ch * p = pptr();
const Ch * b = pbase();
if(p != NULL && p != b) {
seekpos(0, ::std::ios_base::out);
}
p = gptr();
b = eback();
if(p != NULL && p != b) {
seekpos(0, ::std::ios_base::in);
}
}
template<class Ch, class Tr, class Alloc>
void basic_altstringbuf<Ch, Tr, Alloc>::
str (const string_type& s) {
size_type sz=s.size();
if(sz != 0 && mode_ & (::std::ios_base::in | ::std::ios_base::out) ) {
#ifdef _RWSTD_NO_CLASS_PARTIAL_SPEC
void *vd_ptr = boost::allocator_allocate(alloc_, sz, is_allocated_? eback() : 0);
Ch *new_ptr = static_cast<Ch *>(vd_ptr);
#else
Ch *new_ptr = boost::allocator_allocate(alloc_, sz, is_allocated_? eback() : 0);
#endif
// if this didnt throw, we're safe, update the buffer
dealloc();
sz = s.copy(new_ptr, sz);
putend_ = new_ptr + sz;
if(mode_ & ::std::ios_base::in)
streambuf_t::setg(new_ptr, new_ptr, new_ptr + sz);
if(mode_ & ::std::ios_base::out) {
streambuf_t::setp(new_ptr, new_ptr + sz);
if(mode_ & (::std::ios_base::app | ::std::ios_base::ate))
streambuf_t::pbump(static_cast<int>(sz));
if(gptr() == NULL)
streambuf_t::setg(new_ptr, NULL, new_ptr);
}
is_allocated_ = true;
}
else
dealloc();
}
template<class Ch, class Tr, class Alloc>
Ch* basic_altstringbuf<Ch, Tr, Alloc>::
begin () const {
if(mode_ & ::std::ios_base::out && pptr() != NULL)
return pbase();
else if(mode_ & ::std::ios_base::in && gptr() != NULL)
return eback();
return NULL;
}
template<class Ch, class Tr, class Alloc>
typename std::basic_string<Ch,Tr,Alloc>::size_type
basic_altstringbuf<Ch, Tr, Alloc>::
size () const {
if(mode_ & ::std::ios_base::out && pptr())
return static_cast<size_type>(pend() - pbase());
else if(mode_ & ::std::ios_base::in && gptr())
return static_cast<size_type>(egptr() - eback());
else
return 0;
}
template<class Ch, class Tr, class Alloc>
typename std::basic_string<Ch,Tr,Alloc>::size_type
basic_altstringbuf<Ch, Tr, Alloc>::
cur_size () const {
if(mode_ & ::std::ios_base::out && pptr())
return static_cast<streamsize>( pptr() - pbase());
else if(mode_ & ::std::ios_base::in && gptr())
return static_cast<streamsize>( gptr() - eback());
else
return 0;
}
template<class Ch, class Tr, class Alloc>
typename basic_altstringbuf<Ch, Tr, Alloc>::pos_type
basic_altstringbuf<Ch, Tr, Alloc>::
seekoff (off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which) {
if(pptr() != NULL && putend_ < pptr())
putend_ = pptr();
if(which & ::std::ios_base::in && gptr() != NULL) {
// get area
if(way == ::std::ios_base::end)
off += static_cast<off_type>(putend_ - gptr());
else if(way == ::std::ios_base::beg)
off += static_cast<off_type>(eback() - gptr());
else if(way != ::std::ios_base::cur || (which & ::std::ios_base::out) )
// (altering in&out is only supported if way is beg or end, not cur)
return pos_type(off_type(-1));
if(eback() <= off+gptr() && off+gptr() <= putend_ ) {
// set gptr
streambuf_t::gbump(static_cast<int>(off));
if(which & ::std::ios_base::out && pptr() != NULL)
// update pptr to match gptr
streambuf_t::pbump(static_cast<int>(gptr()-pptr()));
}
else
off = off_type(-1);
}
else if(which & ::std::ios_base::out && pptr() != NULL) {
// put area
if(way == ::std::ios_base::end)
off += static_cast<off_type>(putend_ - pptr());
else if(way == ::std::ios_base::beg)
off += static_cast<off_type>(pbase() - pptr());
else
return pos_type(off_type(-1));
if(pbase() <= off+pptr() && off+pptr() <= putend_)
// set pptr
streambuf_t::pbump(static_cast<int>(off));
else
off = off_type(-1);
}
else // neither in nor out
off = off_type(-1);
return (pos_type(off));
}
//- end seekoff(..)
template<class Ch, class Tr, class Alloc>
typename basic_altstringbuf<Ch, Tr, Alloc>::pos_type
basic_altstringbuf<Ch, Tr, Alloc>::
seekpos (pos_type pos, ::std::ios_base::openmode which) {
off_type off = off_type(pos); // operation guaranteed by fpos.operations table 127
if(pptr() != NULL && putend_ < pptr())
putend_ = pptr();
if(off != off_type(-1)) {
if(which & ::std::ios_base::in && gptr() != NULL) {
// get area
if(0 <= off && off <= putend_ - eback()) {
streambuf_t::gbump(static_cast<int>(eback() - gptr() + off));
if(which & ::std::ios_base::out && pptr() != NULL) {
// update pptr to match gptr
streambuf_t::pbump(static_cast<int>(gptr()-pptr()));
}
}
else
off = off_type(-1);
}
else if(which & ::std::ios_base::out && pptr() != NULL) {
// put area
if(0 <= off && off <= putend_ - eback())
streambuf_t::pbump(static_cast<int>(eback() - pptr() + off));
else
off = off_type(-1);
}
else // neither in nor out
off = off_type(-1);
return (pos_type(off));
}
else {
BOOST_ASSERT(0); // fpos.operations allows undefined-behaviour here
return pos_type(off_type(-1));
}
}
// -end seekpos(..)
template<class Ch, class Tr, class Alloc>
typename basic_altstringbuf<Ch, Tr, Alloc>::int_type
basic_altstringbuf<Ch, Tr, Alloc>::
underflow () {
if(gptr() == NULL) // no get area -> nothing to get.
return (compat_traits_type::eof());
else if(gptr() < egptr()) // ok, in buffer
return (compat_traits_type::to_int_type(*gptr()));
else if(mode_ & ::std::ios_base::in && pptr() != NULL
&& (gptr() < pptr() || gptr() < putend_) )
{ // expand get area
if(putend_ < pptr())
putend_ = pptr(); // remember pptr reached this far
streambuf_t::setg(eback(), gptr(), putend_);
return (compat_traits_type::to_int_type(*gptr()));
}
else // couldnt get anything. EOF.
return (compat_traits_type::eof());
}
// -end underflow(..)
template<class Ch, class Tr, class Alloc>
typename basic_altstringbuf<Ch, Tr, Alloc>::int_type
basic_altstringbuf<Ch, Tr, Alloc>::
pbackfail (int_type meta) {
if(gptr() != NULL && (eback() < gptr())
&& (mode_ & (::std::ios_base::out)
|| compat_traits_type::eq_int_type(compat_traits_type::eof(), meta)
|| compat_traits_type::eq(compat_traits_type::to_char_type(meta), gptr()[-1]) ) ) {
streambuf_t::gbump(-1); // back one character
if(!compat_traits_type::eq_int_type(compat_traits_type::eof(), meta))
// put-back meta into get area
*gptr() = compat_traits_type::to_char_type(meta);
return (compat_traits_type::not_eof(meta));
}
else
return (compat_traits_type::eof()); // failed putback
}
// -end pbackfail(..)
template<class Ch, class Tr, class Alloc>
typename basic_altstringbuf<Ch, Tr, Alloc>::int_type
basic_altstringbuf<Ch, Tr, Alloc>::
overflow (int_type meta) {
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4996)
#endif
if(compat_traits_type::eq_int_type(compat_traits_type::eof(), meta))
return compat_traits_type::not_eof(meta); // nothing to do
else if(pptr() != NULL && pptr() < epptr()) {
streambuf_t::sputc(compat_traits_type::to_char_type(meta));
return meta;
}
else if(! (mode_ & ::std::ios_base::out))
// no write position, and cant make one
return compat_traits_type::eof();
else { // make a write position available
std::size_t prev_size = pptr() == NULL ? 0 : epptr() - eback();
std::size_t new_size = prev_size;
// exponential growth : size *= 1.5
std::size_t add_size = new_size / 2;
if(add_size < alloc_min)
add_size = alloc_min;
Ch * newptr = NULL, *oldptr = eback();
// make sure adding add_size wont overflow size_t
while (0 < add_size && ((std::numeric_limits<std::size_t>::max)()
- add_size < new_size) )
add_size /= 2;
if(0 < add_size) {
new_size += add_size;
#ifdef _RWSTD_NO_CLASS_PARTIAL_SPEC
void *vdptr = boost::allocator_allocate(alloc_, new_size, is_allocated_? oldptr : 0);
newptr = static_cast<Ch *>(vdptr);
#else
newptr = boost::allocator_allocate(alloc_, new_size, is_allocated_? oldptr : 0);
#endif
}
if(0 < prev_size)
compat_traits_type::copy(newptr, oldptr, prev_size);
if(is_allocated_)
alloc_.deallocate(oldptr, prev_size);
is_allocated_=true;
if(prev_size == 0) { // first allocation
putend_ = newptr;
streambuf_t::setp(newptr, newptr + new_size);
if(mode_ & ::std::ios_base::in)
streambuf_t::setg(newptr, newptr, newptr + 1);
else
streambuf_t::setg(newptr, 0, newptr);
}
else { // update pointers
putend_ = putend_ - oldptr + newptr;
int pptr_count = static_cast<int>(pptr()-pbase());
int gptr_count = static_cast<int>(gptr()-eback());
streambuf_t::setp(pbase() - oldptr + newptr, newptr + new_size);
streambuf_t::pbump(pptr_count);
if(mode_ & ::std::ios_base::in)
streambuf_t::setg(newptr, newptr + gptr_count, pptr() + 1);
else
streambuf_t::setg(newptr, 0, newptr);
}
streambuf_t::sputc(compat_traits_type::to_char_type(meta));
return meta;
}
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}
// -end overflow(..)
template<class Ch, class Tr, class Alloc>
void basic_altstringbuf<Ch, Tr, Alloc>:: dealloc() {
if(is_allocated_)
alloc_.deallocate(eback(), (pptr() != NULL ? epptr() : egptr()) - eback());
is_allocated_ = false;
streambuf_t::setg(0, 0, 0);
streambuf_t::setp(0, 0);
putend_ = NULL;
}
}// N.S. io
} // N.S. boost
#endif // include guard