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util: Avoid uninitialized pointer complaints from Coverity.

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This commit is contained in:
Ben Pfaff
2011-02-24 15:33:57 -08:00
parent a2c6a63cc0
commit 4e6ca956f5
1 changed files with 17 additions and 1 deletions
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18
lib/util.h
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@@ -85,6 +85,22 @@ extern const char *program_name;
#define OVS_TYPEOF(OBJECT) void *
#endif
/* Given OBJECT of type pointer-to-structure, expands to the offset of MEMBER
* within an instance of the structure.
*
* The GCC-specific version avoids the technicality of undefined behavior if
* OBJECT is null, invalid, or not yet initialized. This makes some static
* checkers (like Coverity) happier. But the non-GCC version does not actually
* dereference any pointer, so it would be surprising for it to cause any
* problems in practice.
*/
#ifdef __GNUC__
#define OBJECT_OFFSETOF(OBJECT, MEMBER) offsetof(typeof(*(OBJECT)), MEMBER)
#else
#define OBJECT_OFFSETOF(OBJECT, MEMBER) \
((char *) &(OBJECT)->MEMBER - (char *) (OBJECT))
#endif
/* Given POINTER, the address of the given MEMBER in a STRUCT object, returns
the STRUCT object. */
#define CONTAINER_OF(POINTER, STRUCT, MEMBER) \
@@ -99,7 +115,7 @@ extern const char *program_name;
* from the type of '*OBJECT'. */
#define OBJECT_CONTAINING(POINTER, OBJECT, MEMBER) \
((OVS_TYPEOF(OBJECT)) (void *) \
((char *) (POINTER) - ((char *) &(OBJECT)->MEMBER - (char *) (OBJECT))))
((char *) (POINTER) - OBJECT_OFFSETOF(OBJECT, MEMBER)))
/* Given POINTER, the address of the given MEMBER within an object of the type
* that that OBJECT points to, assigns the address of the outer object to