[streambuf.pub.get]

streamsize in_avail();

Returns: If a read position is available, returns egptr() - gptr().

Otherwise returns showmanyc().

int_type snextc();

Effects: Calls sbumpc().

Returns: If that function returns traits::eof(), returns traits::eof().

Otherwise, returns sgetc().

int_type sbumpc();

Effects: If the input sequence read position is not available, returns uflow().

Otherwise, returns traits::to_int_type(*gptr() and increments the next pointer for the input sequence.

int_type sgetc();

Returns: If the input sequence read position is not available, returns underflow().

Otherwise, returns traits::to_int_type(*gptr().

streamsize sgetn(char_type* s, streamsize n);

Returns: xsgetn(s, n).

31 Input/output library [input.output]