Basing a Data Structure on a pointer

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I am using the QDBRTVFD API to get database file information.
 I want to put the information returned into a user space.
 There is an IBM supplied Data Structure layout of the data returned
that I have picked up from QSYSINC and am including in my program as a
/COPY 
What I want to do is base the data structure of the FDT (QDBQ25) on a
pointer to the user space, 
but I want to do this without modifying the IBM supplied /COPY or
copying the /COPY into my program, or do it at run time. Anybody suggest
a way?
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Basing a Data Structure on a pointer - V4R2