Is there a library repository for C?

Possible Duplicate:
Why there is not a comprehensive c archive network?

Everyone knows that C is very small language, it has just language primitives and almost no standard library (no data structures or algorithms).

Therefore I have a question, how do I find good C libraries for data structures, algorithms and perhaps system programming?

For example, if I need a hash-table, how do I find a good implementation? Or for example, if I need to work with graphs, what do I do?

So far I have been writing everything myself. But my hash table implementation is nowhere good enough. It's very basic.

What do advanced C programmers do with this problem? Do they really write all the libraries again themselves?

Thanks, Boda Cydo.