Date: Mon, 09 Aug 2004 14:40:37 -0700 From: Julian Elischer <julian@elischer.org> To: current@freebsd.org Subject: RFC.. defining __rangeof() in cdefs.h Message-ID: <4117EF55.4090409@elischer.org>
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I'm considdereing adding: Index: sys/cdefs.h =================================================================== RCS file: /home/ncvs/src/sys/sys/cdefs.h,v retrieving revision 1.83 diff -u -r1.83 cdefs.h --- sys/cdefs.h 28 Jul 2004 07:03:42 -0000 1.83 +++ sys/cdefs.h 9 Aug 2004 21:36:41 -0000 @@ -241,6 +241,8 @@ * require it. */ #define __offsetof(type, field) ((size_t)(&((type *)0)->field)) +#define __rangeof(type, start, end) \ + (__offsetof(type, end) - __offsetof(type, start)) /* * Compiler-dependent macros to declare that functions take printf-like it is used in several places. most importantly in fork1() and it is defined in several files (*).. we should probably just have one copy... (*) in the form RANGEOF() but if we define it in cdefs.h I'd change that to __rangeof() to match __offsetof()
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