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author | Jeremy Kerr <jk@ozlabs.org> | 2013-10-21 11:03:17 +0800 |
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committer | Jeremy Kerr <jk@ozlabs.org> | 2013-11-13 17:20:28 +0800 |
commit | dd8fe077022138d1f6aca7e6d6cceec61f56ce95 (patch) | |
tree | 1ceb699411ddbdcde2a96cdbea85d275f454b736 /lib/util | |
parent | 59dbd08e2a8354e71578c0d7ca2283951a384801 (diff) | |
download | petitboot-dd8fe077022138d1f6aca7e6d6cceec61f56ce95.zip petitboot-dd8fe077022138d1f6aca7e6d6cceec61f56ce95.tar.gz |
lib: consolidate util macros in util/util.h
This change groups the offsetof, container_of and ARRAY_SIZE macros in a
single header file util/util.h.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Diffstat (limited to 'lib/util')
-rw-r--r-- | lib/util/util.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/lib/util/util.h b/lib/util/util.h new file mode 100644 index 0000000..30b472d --- /dev/null +++ b/lib/util/util.h @@ -0,0 +1,34 @@ +/* + * Copyright (C) 2013 IBM Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef UTIL_H +#define UTIL_H + +#ifndef container_of +#define container_of(_ptr, _type, _member) ({ \ + const typeof( ((_type *)0)->_member ) *__mptr = (_ptr); \ + (_type *)( (char *)__mptr - offsetof(_type,_member) );}) +#endif + +#ifndef offsetof +#define offsetof(_type, _member) ((size_t) &((_type *)0)->_member) +#endif + +#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0])) + +#endif /* UTIL_H */ + |