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std-aux: add NM_ALIGN*() macros

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Taken from systemd's ALIGN(), ALIGN_TO(), etc.
This commit is contained in:
Thomas Haller 2022-10-13 10:48:05 +02:00
parent 9f534341e0
commit 5f3259b620
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1 changed files with 18 additions and 0 deletions
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18
src/libnm-std-aux/nm-std-aux.h
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@ -410,6 +410,24 @@ nm_mult_clamped_u(unsigned a, unsigned b)
/*****************************************************************************/
static inline size_t
NM_ALIGN_TO(size_t l, size_t ali)
{
nm_assert(nm_utils_is_power_of_two(ali));
if (l > SIZE_MAX - (ali - 1))
return SIZE_MAX; /* indicate overflow */
return ((l + ali - 1) & ~(ali - 1));
}
#define NM_ALIGN4(l) NM_ALIGN_TO(l, 4)
#define NM_ALIGN8(l) NM_ALIGN_TO(l, 8)
#define NM_ALIGN(l) NM_ALIGN_TO(l, sizeof(void *))
#define NM_ALIGN_PTR(p) ((void *) NM_ALIGN((uintptr_t) (p)))
/*****************************************************************************/
#define NM_SWAP(p_a, p_b) \
do { \
typeof(*(p_a)) *const _p_a = (p_a); \