[Cpp-Programming] Read position issue within an IOSTREAM class

I need to fill an IOSTREAM class with a part of a file during the process of compiling a C program using multiple passes in a compiler written in C++.  I fill the new instance of an input stream with a part of a file.  This stream stores and processes the auto variables defined within a function.  My plan is to read the part of a function until the first executable statement.  It seems to that.  However, during the declaration phase, nothing is declared.  I'm wondering if maybe I need to explicitly set the read pointer to the beginning of the buffer.  Is this true?  If so, how do I reset the pointer?  I'm sorry about the newbie question, but I don't have available C++ documentation.

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