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| author | Tavian Barnes <tavianator@tavianator.com> | 2023-03-28 14:18:08 -0400 |
|---|---|---|
| committer | Tavian Barnes <tavianator@tavianator.com> | 2023-03-29 12:26:43 -0400 |
| commit | 135b98c26456adbfbc72fb12e4753ee0716b1f92 (patch) | |
| tree | 992541d0f4b215dd44a6648db0f796a7a05da2dc /src/config.h | |
| parent | e40855d3b98aa3f65c19608b3d8c70f54b714063 (diff) | |
| download | bfs-135b98c26456adbfbc72fb12e4753ee0716b1f92.tar.xz | |
list: New generic linked list API
Diffstat (limited to 'src/config.h')
| -rw-r--r-- | src/config.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/config.h b/src/config.h index 34ae11d..cee8511 100644 --- a/src/config.h +++ b/src/config.h @@ -147,6 +147,17 @@ */ #define BFS_COUNTOF(array) (sizeof(array) / sizeof(0[array])) +// BFS_CONTAINER_OF() helper +static inline char *bfs_container_offset(char *ptr, ptrdiff_t offset, size_t unused) { + return ptr ? ptr - offset : NULL; +} + +/** + * Move a pointer from a field to its outer struct. + */ +#define BFS_CONTAINER_OF(ptr, type, member) \ + ((type *)bfs_container_offset((char *)(ptr), offsetof(type, member), sizeof((ptr) - &((type *)NULL)->member))) + // Lower bound on BFS_FLEX_SIZEOF() #define BFS_FLEX_LB(type, member, length) (offsetof(type, member) + sizeof(((type *)NULL)->member[0]) * (length)) |