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x86-32
strtoull() doesn't make it particularly easy to detect passed-in
negative numbers, as it silently converts them to positive ones without
generating any error. Since we are not interested in negative values we
should hence explicitly filter them out by looking at the string
directly and returning ERANGE if we see a leading "-".
Fixes: #1829
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We have enough places where we parse an ifindex, hence introduce a
proper parsing function for it, that verifies all parameters.
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This function will be useful for CPUAffinity settings that involve
ranges of CPUs.
Make it generic and include test coverage to prevent regressions.
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