diff options
Diffstat (limited to 'util.h')
| -rw-r--r-- | util.h | 23 |
1 files changed, 23 insertions, 0 deletions
@@ -26,6 +26,7 @@ #include <fnmatch.h> #include <regex.h> #include <stdbool.h> +#include <stddef.h> #include <sys/types.h> // Some portability concerns @@ -91,6 +92,28 @@ # define BFS_FORMATTER(fmt, args) #endif +// Lower bound on BFS_FLEX_SIZEOF() +#define BFS_FLEX_LB(type, member, length) (offsetof(type, member) + sizeof(((type *)NULL)->member[0]) * (length)) + +// Maximum macro for BFS_FLEX_SIZE() +#define BFS_FLEX_MAX(a, b) ((a) > (b) ? (a) : (b)) + +/** + * Computes the size of a struct containing a flexible array member of the given + * length. + * + * @param type + * The type of the struct containing the flexible array. + * @param member + * The name of the flexible array member. + * @param length + * The length of the flexible array. + */ +#define BFS_FLEX_SIZEOF(type, member, length) \ + (sizeof(type) <= BFS_FLEX_LB(type, member, 0) \ + ? BFS_FLEX_LB(type, member, length) \ + : BFS_FLEX_MAX(sizeof(type), BFS_FLEX_LB(type, member, length))) + /** * readdir() wrapper that makes error handling cleaner. */ |