David R. Hanson has a book called "C Interfaces and Implementations" that walks you through his C library (that in part replicates the standard library). If you

David R. Hanson has a book called "C Interfaces and Implementations" that walks you through his C library (that in part replicates the standard library). If your're a novice (or a novice at C) you can learn a lot. The code is free to download.