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| <h3 class="section">12.21 Other Kinds of Streams</h3> |
| |
| <p>The GNU library provides ways for you to define additional kinds of |
| streams that do not necessarily correspond to an open file. |
| |
| <p>One such type of stream takes input from or writes output to a string. |
| These kinds of streams are used internally to implement the |
| <code>sprintf</code> and <code>sscanf</code> functions. You can also create such a |
| stream explicitly, using the functions described in <a href="String-Streams.html#String-Streams">String Streams</a>. |
| |
| <p>More generally, you can define streams that do input/output to arbitrary |
| objects using functions supplied by your program. This protocol is |
| discussed in <a href="Custom-Streams.html#Custom-Streams">Custom Streams</a>. |
| |
| <p><strong>Portability Note:</strong> The facilities described in this section are |
| specific to GNU. Other systems or C implementations might or might not |
| provide equivalent functionality. |
| |
| <ul class="menu"> |
| <li><a accesskey="1" href="String-Streams.html#String-Streams">String Streams</a>: Streams that get data from or put data in |
| a string or memory buffer. |
| <li><a accesskey="2" href="Obstack-Streams.html#Obstack-Streams">Obstack Streams</a>: Streams that store data in an obstack. |
| <li><a accesskey="3" href="Custom-Streams.html#Custom-Streams">Custom Streams</a>: Defining your own streams with an arbitrary |
| input data source and/or output data sink. |
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