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It's worth pointing out that the source code for the C standard library does not necessarily highlight good coding practices. As the standard library, it has a special status where, for example, it can rely on a lot of unspecified or non-portable behavior simply because they know the exact compiler with which it is used.
And of course, this only tells you about C coding practices.
That has nothing to do with C++ coding practices, which are very different. Don't treat them as one language. There is no such thing as C/C++. C is a language with its own coding practices and common idioms, and C++ is a separate, independent language which also has its own practices and idioms.
Good C code is rarely good C++ code. strcpy and other C library functions are certainly not good C++ code.
"The Standarc C Library" is a specification. You want the sources for an implementation of the specification. Your C compiler may or not provide such sources - one that does is GCC.
If you use Visual Studio Professional or Team, you should be able to find the source here:
C:\Program Files\Microsoft Visual Studio 9.0\VC\crt\src