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e124565c58
Fixes #275. This results in fewer casts and less subtraction than the previous method, and should still be portable. Only division and subtraction and difftime are performed on the value, so it will not overflow. And the TCP timestamp itself is a 32-bit value, so it can't refer to a time farther in the past than the 32-bit epoch. One explicit cast (to long long) is used in order to ensure the format string can handle any conceivable value according to the compiler and avoid a warning message.
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( https://nmap.org ).