I am a Unix system developer from Cambridge. I work on BIND9 at the Internet Systems Consortium ( isc.org ) .
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A couple of years ago I wrote about tolower() in bulk at speed using SWAR tricks . A couple of days ago I was interested by Olivier Giniaux’s article about unsafe read beyond of death , an optimization for handling small strings with SIMD instructions, for a fast hash function written in Rust.
DNS servers often have to convert DNS names to their canonical lower case form. BIND has to do so a bit more than most because it tries to preserve the case of DNS names rather than canonicalizing them.
There are a couple of version control commands that deserve wider appreciation: SCCS what and RCS ident . They allow you to find out what source a binary was built from, without having to run it – handy if it is a library! They basically scan a file looking for magic strings that contain version control metadata and…