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shared: add nm_ptr_to_uintptr() helper

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This commit is contained in:
Thomas Haller 2020-10-22 11:50:23 +02:00
parent b38075b751
commit c947c51651
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1 changed files with 16 additions and 1 deletions
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17
shared/nm-std-aux/nm-std-aux.h
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@ -780,6 +780,21 @@ nm_steal_fd(int *p_fd)
/*****************************************************************************/
static inline uintptr_t
nm_ptr_to_uintptr(const void *p)
{
/* in C, pointers can only be compared (with less-than or greater-than) under certain
* circumstances. Since uintptr_t is supposed to be able to represent the pointer
* as a plain integer and also support to convert the integer back to the pointer,
* it should be safer to compare the pointers directly.
*
* Of course, this function isn't very useful beyond that its use makes it clear
* that we want to compare pointers by value, which otherwise may not be valid. */
return (uintptr_t) p;
}
/*****************************************************************************/
#define NM_CMP_RETURN(c) \
do { \
const int _cc = (c); \
@ -826,7 +841,7 @@ nm_steal_fd(int *p_fd)
* 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_PTR(a, b) NM_CMP_DIRECT(nm_ptr_to_uintptr(a), nm_ptr_to_uintptr(b))
#define NM_CMP_DIRECT_MEMCMP(a, b, size) NM_CMP_RETURN(memcmp((a), (b), (size)))