Optimization I'd like to see compilers be able to make: if (strlen(s)>100) -> if (strnlen(s,101)>100)
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I don't think size_t is required to be the same size as a pointer. You might not be able to create such a large string yourself on the heap, but that doesn't mean it can't already exist...
Related issue: What if there is not a single zero byte in memory? What is the expected behavior of strlen(s)>100 in this case? If it has to never return then it isn't equivalent to strnlen(s, 101)>100.
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strlen is only defined when the parameter points to a zero-terminated string. If there's no zero byte in memory, you don't have a string, and calling strlen invokes undefined behavior.
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