strstreambuf::~strstreambuf()
{
if (eback() && (__strmode_ & __allocated) != 0 && (__strmode_ & __frozen) == 0)
{
if (__pfree_)
__pfree_(eback());
else
delete [] eback();
}
}
strstreambuf::int_type
strstreambuf::overflow(int_type __c)
{
if (__c == EOF)
return int_type(0);
if (pptr() == epptr())
{
if ((__strmode_ & __dynamic) == 0 || (__strmode_ & __frozen) != 0)
return int_type(EOF);
size_t old_size = static_cast<size_t> ((epptr() ? epptr() : egptr()) - eback());
size_t new_size = max<size_t>(static_cast<size_t>(__alsize_), 2*old_size);
if (new_size == 0)
new_size = __default_alsize;
char* buf = nullptr;
if (__palloc_)
buf = static_cast<char*>(__palloc_(new_size));
else
buf = new char[new_size];
if (buf == nullptr)
return int_type(EOF);
if (old_size != 0) {
_LIBCPP_ASSERT(eback(), "overflow copying from NULL");
memcpy(buf, eback(), static_cast<size_t>(old_size));
}
ptrdiff_t ninp = gptr() - eback();
ptrdiff_t einp = egptr() - eback();
ptrdiff_t nout = pptr() - pbase();
if (__strmode_ & __allocated)
{
if (__pfree_)
__pfree_(eback());
else
delete [] eback();
}
setg(buf, buf + ninp, buf + einp);
setp(buf + einp, buf + new_size);
pbump(static_cast<int>(nout));
__strmode_ |= __allocated;
}
*pptr() = static_cast<char>(__c);
pbump(1);
return int_type(static_cast<unsigned char>(__c));
}
