diff options
| author | William Casarin <jb55@jb55.com> | 2018-07-09 12:10:32 -0700 |
|---|---|---|
| committer | William Casarin <jb55@jb55.com> | 2018-07-09 12:10:32 -0700 |
| commit | 1b8fbbd843ddeb5fc81c9303db9c590a436d499b (patch) | |
| tree | a7227dfe8e4fbaee7b1e0b58b24994dce8078f3f /ccan/alignof/alignof.h | |
| parent | 37a9cdd2e80386f2c94e14e4f511284ae14c745a (diff) | |
progress
Diffstat (limited to 'ccan/alignof/alignof.h')
| -rw-r--r-- | ccan/alignof/alignof.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/ccan/alignof/alignof.h b/ccan/alignof/alignof.h new file mode 100644 index 0000000..9a02f18 --- /dev/null +++ b/ccan/alignof/alignof.h @@ -0,0 +1,20 @@ +/* CC0 (Public domain) - see LICENSE file for details */ +#ifndef CCAN_ALIGNOF_H +#define CCAN_ALIGNOF_H +#include "config.h" + +/** + * ALIGNOF - get the alignment of a type + * @t: the type to test + * + * This returns a safe alignment for the given type. + */ +#if HAVE_ALIGNOF +/* A GCC extension. */ +#define ALIGNOF(t) __alignof__(t) +#else +/* Alignment by measuring structure padding. */ +#define ALIGNOF(t) ((char *)(&((struct { char c; t _h; } *)0)->_h) - (char *)0) +#endif + +#endif /* CCAN_ALIGNOF_H */ |