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Open Source and information security mailing list archives
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Date: Fri, 24 Jul 2015 09:58:18 -0700 From: Randy Dunlap <rdunlap@...radead.org> To: Ahmed Soliman <ahmedsoliman0x666@...il.com>, linux-kernel@...r.kernel.org Subject: Re: how does 0x##p##q work On 07/24/15 09:02, Ahmed Soliman wrote: > I was working on cleaning up some files in the crypto dirctory using > checkpatch.pl > and I found this strange define in crypto/gf128mul.c > #define xx(p, q) 0x##p##q > It just seems really weird macro and I cant figure out what is it > supposed to do!! ## is defined in any complete C language spec (it's a preprocessor directive). It is used for string concatenation, aka pasting or gluing strings together. google can find lots of references for it if you need more info. -- ~Randy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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