template <typename Iter, typename Traits> NEXTWEB_INLINE typename StreamBuffer<Iter, Traits>::PosType
StreamBuffer<Iter, Traits>::seekoff(typename StreamBuffer<Iter, Traits>::OffType off, std::ios::seekdir dir, std::ios::openmode which) {
if (!(which & std::ios::in)) {
return BAD_POSITION;
}
DistanceType size = std::distance(begin_, end_);
DistanceType dist = static_cast<DistanceType>(off);
DistanceType position = static_cast<DistanceType>(-1);
if ((std::ios::beg == dir) && (dist >= 0) && (dist < size)) {
position = dist;
}
else if ((std::ios::end == dir) && (dist >= 0) && (dist < size)) {
position = size - dist;
}
else if (std::ios::cur == dir) {
position = std::distance(begin_, current_) - static_cast<DistanceType>(egptr() - gptr()) + dist;
if ((position < 0) || (position >= size)) {
return BAD_POSITION;
}
}
if (static_cast<DistanceType>(-1) != position) {
current_ = begin_;
std::advance(current_, position);
fill();
return static_cast<PosType>(position);
}
return BAD_POSITION;
}
template <typename Iter, typename Traits> NEXTWEB_INLINE typename StreamBuffer<Iter, Traits>::IntType
StreamBuffer<Iter, Traits>::underflow() {
assert(gptr() == egptr());
if (end_ == current_) {
return Traits::eof();
}
return fill();
}
template <typename Iter, typename Traits> NEXTWEB_INLINE typename StreamBuffer<Iter, Traits>::IntType
StreamBuffer<Iter, Traits>::pbackfail(typename StreamBuffer<Iter, Traits>::IntType value) {
assert(gptr() == eback());
if (begin_ == current_) {
return Traits::eof();
}
--current_;
DistanceType dist = static_cast<DistanceType>(egptr() - eback());
memmove(buffer_ + 1, buffer_, dist - 1);
buffer_[0] = value;
return Traits::to_int_type(value);
}
template <typename Iter, typename Traits> NEXTWEB_INLINE std::streamsize
StreamBuffer<Iter, Traits>::showmanyc() {
assert(gptr() == egptr());
DistanceType dist = std::distance(current_, end_);
return (0 == dist) ? static_cast<std::streamsize>(-1) : static_cast<std::streamsize>(dist);
}