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shared: add NM_CMP_DIRECT_PTR() macro

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(cherry picked from commit 95ccfdb69a)
This commit is contained in:
Thomas Haller 2020-04-22 09:37:28 +02:00
parent 93b130c05a
commit 198563ad93
1 changed files with 8 additions and 0 deletions
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8
shared/nm-glib-aux/nm-shared-utils.h
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@ -280,6 +280,14 @@ gboolean nm_utils_ipaddr_is_normalized (int addr_family,
return (_a < _b) ? -1 : 1; \
} G_STMT_END
/* In the general case, direct pointer comparison is undefined behavior in C.
* Avoid that by casting pointers to void* and then to uintptr_t. This comparison
* is not really meaningful, except that it provides some kind of stable sort order
* between pointers (that can otherwise not be compared). */
#define NM_CMP_DIRECT_PTR(a, b) \
NM_CMP_DIRECT ((uintptr_t) ((void *) (a)), \
(uintptr_t) ((void *) (b)))
#define NM_CMP_DIRECT_MEMCMP(a, b, size) \
NM_CMP_RETURN (memcmp ((a), (b), (size)))