mirrors/redsocks
0
0
Fork 0
mirror of https://github.com/darkk/redsocks.git synced 2025-08-29 13:15:30 +00:00
Code

Rewrite container_of macro without using statement expression.

Browse Source 
Statement expression is GNU C extension, not present in ISO standard.
Type checking works now via implicit conversion performed for compound
literal (compound literals are available since C99). typeof is only used
on GNUC compilers like gcc or clang.
This commit is contained in:
Przemyslaw Pawelczyk 2014-07-05 00:31:04 +02:00
parent 2e3f648809
commit fce288f657
1 changed files with 11 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
utils.h
View File

@ -20,6 +20,12 @@ struct sockaddr_in;
#endif #endif
#ifdef __GNUC__
#define member_type(type, member) __typeof(((type *)0)->member)
#else
#define member_type(type, member) const void
#endif
/** /**
* container_of - cast a member of a structure out to the containing structure * container_of - cast a member of a structure out to the containing structure
* @ptr: the pointer to the member. * @ptr: the pointer to the member.
@ -27,9 +33,11 @@ struct sockaddr_in;
* @member: the name of the member within the struct. * @member: the name of the member within the struct.
* *
*/ */
#define container_of(ptr, type, member) ({ \ #define container_of(ptr, type, member) \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ((type *)( \
(type *)( (char *)__mptr - offsetof(type,member) );}) (char *)(member_type(type, member) *){ ptr } - offsetof(type, member) \
))
#define clamp_value(value, min_val, max_val) do { \ #define clamp_value(value, min_val, max_val) do { \
if (value < min_val) \ if (value < min_val) \