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| author | Nick Mathewson <nickm@torproject.org> | 2018-06-21 16:29:24 -0400 |
|---|---|---|
| committer | Nick Mathewson <nickm@torproject.org> | 2018-06-22 09:49:13 -0400 |
| commit | 479c2ab503a3a051200339a7df9a99dcfb0ed976 (patch) | |
| tree | ef708dd688b506a8b8eddbbd20fccd5cafa1237d /src/lib/cc | |
| parent | 657ff55408d82f49fc9599cb662702cdc0995f08 (diff) | |
| download | tor-479c2ab503a3a051200339a7df9a99dcfb0ed976.tar.gz tor-479c2ab503a3a051200339a7df9a99dcfb0ed976.zip | |
Move STRUCT_VAR_P to compat_compiler.
Diffstat (limited to 'src/lib/cc')
| -rw-r--r-- | src/lib/cc/compat_compiler.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/lib/cc/compat_compiler.h b/src/lib/cc/compat_compiler.h index 31e84bcc5b..763c3d06d5 100644 --- a/src/lib/cc/compat_compiler.h +++ b/src/lib/cc/compat_compiler.h @@ -242,4 +242,15 @@ #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) ) ) + #endif /* !defined(TOR_COMPAT_H) */ |