Re^2: What difference between malloc and Newx, how attach a C string to SV directly?

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sv_usepvn_flags(x, dx, 8, SV_HAS_TRAILING_NUL);

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sv_usepvn_flags(x, dx, 7, SV_HAS_TRAILING_NUL);

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sv_usepvn_flags(x, dx, strlen(dx), SV_HAS_TRAILING_NUL);

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SvREADONLY_on(x);

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SV = PV(0x3e1a1785e0) at 0x3e1a197528
  REFCNT = 1
...
  PV = 0x35260c8bbd5 "dddddd"       <-- Pointer into C static storage
  CUR = 6
  LEN = 0                           <-- Doesn't belong to Perl.

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SV = PV(0x3e1a1785e0) at 0x3e1a197528
  REFCNT = 1
...
  PV = 0x3e1a19fe50 "dddddda"\0     <-- New buffer (copy + "a")
  CUR = 7
  LEN = 17                          <-- Belongs to Perl.

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