#!/usr/bin/perl --
use strict;
use warnings;
use Inline C => Config => BUILD_NOISY => 1, CLEAN_AFTER_BUILD => 0;
use Inline 'C' => <<'CODE',  NAME =>  'xiaoyafeng';
int ddd(SV* x){
    printf("SV* x is %p \n", x);
    SvUTF8_off(x);
    SvGROW(x,8);
    SvCUR_set(x, 8);
    printf("SvPV(x) is p(%p) \n", SvPV_nolen(x));
    printf("SvPV(x) is s(%s) \n", SvPV_nolen(x));
    char*buff = SvPV_nolen(x);
    Copy( "dddddddd", buff , 8, char);
    printf("SvPV(x) is p(%p) \n", SvPV_nolen(x));
    printf("SvPV(x) is s(%s) \n", SvPV_nolen(x));
    printf("string buff is p(%p) \n", buff);
    printf("string buff is s(%s) \n", buff);
    SvSETMAGIC(x);
    return 0;
}
CODE



use Devel::Peek qw/ Dump /;
my $x = "";
Dump $x;
ddd($x);
Dump $x;
exit( 0 );

__END__
SV = PV(0x3f7a8c) at 0x99bca4
  REFCNT = 1
  FLAGS = (PADMY,POK,pPOK)
  PV = 0xb2ac54 ""\0
  CUR = 0
  LEN = 12
SV* x is 0099BCA4
SvPV(x) is p(00B2AC54)
SvPV(x) is s()
SvPV(x) is p(00B2AC54)
SvPV(x) is s(ddddddddng)
string buff is p(00B2AC54)
string buff is s(ddddddddng)
SV = PV(0x3f7a8c) at 0x99bca4
  REFCNT = 1
  FLAGS = (PADMY,POK,pPOK)
  PV = 0xb2ac54 "dddddddd"
  CUR = 8
  LEN = 12
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