SvCUR(SV*)
  SvCUR_set(SV*, I32 val)

##</code><code>##

jeffp@hut [10:44am] ~ #104> perl -MDevel::Peek
$str = "something";
Dump($str);
SV = PV(0xa3424) at 0xb4fc0
  REFCNT = 1
  FLAGS = (POK,pPOK)
  PV = 0xb9600 "something"\0
  CUR = 9
  LEN = 10