diff options
Diffstat (limited to 'src/lib/cc/compat_compiler.h')
| -rw-r--r-- | src/lib/cc/compat_compiler.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/lib/cc/compat_compiler.h b/src/lib/cc/compat_compiler.h index 31e84bcc5b..67d945cfaf 100644 --- a/src/lib/cc/compat_compiler.h +++ b/src/lib/cc/compat_compiler.h @@ -242,4 +242,18 @@ #error Unknown: SIZEOF_INTPTR_T #endif /* (SIZEOF_INTPTR_T == SIZEOF_INT) || ... */ +/** Macro: yield a pointer to the field at position <b>off</b> within the + * structure <b>st</b>. Example: + * <pre> + * struct a { int foo; int bar; } x; + * off_t bar_offset = offsetof(struct a, bar); + * int *bar_p = STRUCT_VAR_P(&x, bar_offset); + * *bar_p = 3; + * </pre> + */ +#define STRUCT_VAR_P(st, off) ((void*) ( ((char*)(st)) + (off) ) ) + +/** Macro: Yields the number of elements in array x. */ +#define ARRAY_LENGTH(x) ((sizeof(x)) / sizeof(x[0])) + #endif /* !defined(TOR_COMPAT_H) */ |