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In the BSDs (and some other code bases) the macro is spelled nitems and is common enough to be considered idiomatic.

Thank you. I did not know about this, I've been using the long version. nitems is defined in sys/param.h in OpenBSD and FreeBSD in case anyone is interested.

I always call my version lengthof() to match sizeof.

I use lengthof for lengths of string literals.

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