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A faq for null pointers: http://c-faq.com/null/index.html. The problem with `if (ptr)` is answered in question 3.

> The C-faq is often 95% complete, and then stops just short of spelling out a crucial detail. Is it saying if NULL == 1, the compiler will resolve the...

@aktau, in your examples you use `sizeof(ret)`, which returns the size of the pointer `ret` and not the length of the string to which `ret` points. Only works for `ret=":return...