The engine implementing the unpack() Perl function.
Using the template pat..patend, this function unpacks the string s..strend into a number of mortal SVs, which it pushes onto the perl argument (@_) stack (so you will need to issue a
PUTBACK before and
SPAGAIN after the call to this function). It returns the number of pushed elements.
The strend and patend pointers should point to the byte following the last character of each string.
Although this function returns its values on the perl argument stack, it doesn't take any parameters from that stack (and thus in particular there's no need to do a PUSHMARK before calling it, unlike "call_pv" for example).
The engine implementing pack() Perl function.