Function ptr_align

src/system.h:511–517

   locations.  */

static inline void *
ptr_align (void const *ptr, size_t alignment)
{
  char const *p0 = ptr;
  char const *p1 = p0 + alignment - 1;
  return (void *) (p1 - (size_t) p1 % alignment);
}

/* Return whether the buffer consists entirely of NULs.
   Based on memeqzero in CCAN by Rusty Russell under CC0 (Public domain).  */