[pjc50]

There is an old but great book called "C traps and Pitfalls" on that subject.

Otherwise you're left alone with yourself and your tooling. Things like valgrind help a lot. But I'll admit that I too find large C projects alarming; it may be better to write "C with classes" code in a C++ environment, so at least you have classes and namespaces as an organisational tool.