Help needed with creating new and replacing an old instruction

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Hi,

I have the following instruction in my IR-
%call2 = call i8* @strcpy(i8* %1, i8* %2) #2

I intend to change call to strcpy with strncpy. I have included the following code in runOnFunction, so that when it is strcpy’s turn to be invoked, strncpy is invoked instead.

Assuming I* is the strcpy instruction,

CallInst* x=new CallInst::CreateCall3(strncpy,1,2,ConstantInt(16),“my_strncpy”);
ReplaceInstWithInst(I*,x);

I’m running into a whole bunch of errors in CreateCall3(). How can I go about writing this correctly?

Any help would be appreciated.

Thanks.
Marc