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 12.21 Other Kinds of Streams
 ============================
 
 The GNU C Library provides ways for you to define additional kinds of
 streams that do not necessarily correspond to an open file.
 
    One such type of stream takes input from or writes output to a
 string.  These kinds of streams are used internally to implement the
 'sprintf' and 'sscanf' functions.  You can also create such a stream
 explicitly, using the functions described in  String Streams.
 
    More generally, you can define streams that do input/output to
 arbitrary objects using functions supplied by your program.  This
 protocol is discussed in  Custom Streams.
 
    *Portability Note:* The facilities described in this section are
 specific to GNU. Other systems or C implementations might or might not
 provide equivalent functionality.
 

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* String Streams              Streams that get data from or put data in
 				 a string or memory buffer.
* Custom Streams              Defining your own streams with an arbitrary
 				 input data source and/or output data sink.
 

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