From: Parav Pandit <parav@xxxxxxxxxxxx> Add array_size.h file for ARRAY_SIZE macro. Signed-off-by: Parav Pandit <parav@xxxxxxxxxxxx> Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxxxx> --- ccan/CMakeLists.txt | 1 + ccan/array_size.h | 26 ++++++++++++++++++++++++++ 2 files changed, 27 insertions(+) create mode 100644 ccan/array_size.h diff --git a/ccan/CMakeLists.txt b/ccan/CMakeLists.txt index 1793af7..573aa5a 100644 --- a/ccan/CMakeLists.txt +++ b/ccan/CMakeLists.txt @@ -1,4 +1,5 @@ publish_internal_headers(ccan + array_size.h bitmap.h build_assert.h check_type.h diff --git a/ccan/array_size.h b/ccan/array_size.h new file mode 100644 index 0000000..37b200f --- /dev/null +++ b/ccan/array_size.h @@ -0,0 +1,26 @@ +/* CC0 (Public domain) - see LICENSE file for details */ +#ifndef CCAN_ARRAY_SIZE_H +#define CCAN_ARRAY_SIZE_H +#include "config.h" +#include <ccan/build_assert.h> + +/** + * ARRAY_SIZE - get the number of elements in a visible array + * @arr: the array whose size you want. + * + * This does not work on pointers, or arrays declared as [], or + * function parameters. With correct compiler support, such usage + * will cause a build error (see build_assert). + */ +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + _array_size_chk(arr)) + +#if HAVE_BUILTIN_TYPES_COMPATIBLE_P && HAVE_TYPEOF +/* Two gcc extensions. + * &a[0] degrades to a pointer: a different type from an array */ +#define _array_size_chk(arr) \ + BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(typeof(arr), \ + typeof(&(arr)[0]))) +#else +#define _array_size_chk(arr) 0 +#endif +#endif /* CCAN_ALIGNOF_H */ -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
