Hello, I am discussing the OpenBSD logb and logbf from the mathematical part of the C standard library, the same which were imported from NetBSD.
They currently return constants for subnormal inputs. As far as I understand, this is not only not very useful for doing math, it also conflicts with POSIX/SUS and the C standard and the established practice of what other libraries are doing: FreeBSD libm, openlibm, Go(lang) math library, I think even OpenBSD's ilogb all do the right thing. If a fix is wanted, I think OpenBSD's licensing requirements permit simply taking the code from FreeBSD or openlibm (all of those have shared ancestors, so merging should be quite easy). On the other hand, the man page for logb (also left over from NetBSD) says "These functions allow users to test conformance to IEEE Std 754-1985. Their use is not otherwise recommended.", so it could be that logb(f) are wrong on purpose? Regards, Neven Sajko
