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   Although Perl will automatically grow strings for you, if you need 
+to
   force Perl to allocate more memory for your SV, you can use the mac
+ro

       SvGROW(SV*, STRLEN newlen)

  Offsets
    Perl provides the function "sv_chop" to efficiently remove charact
+ers
...
    the number of bytes chopped off into the IV field of the SV. It th
+en
    moves the PV pointer (called "SvPVX") forward that many bytes, and
    adjusts "SvCUR" and "SvLEN".