The string_pad_size.cpp sample program

/**
* UDF string_pad_size() -> int4
* 
* Returns the size of the pad. -1 if no pad is found.
* 
* COMPILATION:
* nzudxcompile UDX_StringPadSize.cpp -o UDX_StringPadSize.o
* 
* REGISTRATION:
* CREATE OR REPLACE FUNCTION string_pad_size()
* RETURNS int4 LANGUAGE CPP PARAMETER STYLE NPSGENERIC NOT FENCED
* CALLED ON NULL INPUT NOT DETERMINISTIC
* EXTERNAL CLASS NAME 'StringPadSize'
* EXTERNAL HOST OBJECT '/tmp/test/UDX_StringPadSize.o_x86'
* EXTERNAL SPU OBJECT '/tmp/test/UDX_StringPadSize.o_spu10';
* 
* -->>Do not register any spu-pad related UDFs as 'deterministic' 
* 
* USAGE:
*
* CREATE TABLE one_dslice(c1 int4);
* INSERT INTO one_dslice VALUES(1);
* SELECT string_pad_create(10, 'netezza') FROM one_dslice;
* SELECT string_pad_size() FROM one_dslice; 
* 
* Copyright (c) 2007-2010 Netezza Corporation, and IBM Company
* All rights reserved.
*/

#include "udxinc.h"
#include <string.h>

using namespace nz::udx;

struct Root
{
 char* data;
 int size;
};

class StringPadSize: public Udf
{
private:

public:
  static Udf* instantiate();
  virtual ReturnValue evaluate()
  {
  CPad* pad = getPad("stringpad");
  Root *ro = (Root*) pad->getRootObject(sizeof(Root));
  if(!ro)
    {
      NZ_UDX_RETURN_INT32(-1); 
    }
    else
    {
      NZ_UDX_RETURN_INT32(ro->size); 
    }
  }
};

Udf* StringPadSize::instantiate()
{
  return new StringPadSize;
}