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compiler.h: add offsetof() and container_of()

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offsetof() is a C99 construct; provided here as an ersatz for older
systems.

container_of() is a nonstandard but highly useful construct, which
allows data structure control items like tree structures to be
embedded in larger data structures without the penalty of extra
pointers and allocations.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2008-10-30 10:52:08 -07:00
parent 3e364fe274
commit 9656a581cd
1 changed files with 14 additions and 1 deletions
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15
compiler.h
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@ -1,6 +1,6 @@
/* ----------------------------------------------------------------------- *
*
* Copyright 2007 The NASM Authors - All Rights Reserved
* Copyright 2007-2008 The NASM Authors - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the license given in the file "LICENSE"
@ -87,6 +87,19 @@ typedef enum bool { false, true } bool;
# endif
#endif
/* Provide a substitute for offsetof() if we don't have one. This
variant works on most (but not *all*) systems... */
#ifndef offsetof
# define offsetof(t,m) ((size_t)&(((t *)0)->m))
#endif
/* The container_of construct: if p is a pointer to member m of
container class c, then return a pointer to the container of which
*p is a member. */
#ifndef container_of
# define container_of(p, c, m) ((c *)((char *)(p) - offsetof(c,m)))
#endif
/* Some misguided platforms hide the defs for these */
#if defined(HAVE_STRCASECMP) && !HAVE_DECL_STRCASECMP
int strcasecmp(const char *, const char *);