Add _ALIGN macro based on one in libmisc/shell/fts.c

freebsd/sys/param.h

@@ -155,6 +155,18 @@
 #define	MJUM9BYTES	(9 * 1024)	/* jumbo cluster 9k */
 #define	MJUM16BYTES	(16 * 1024)	/* jumbo cluster 16k */
 
+/*
+ * Round p (pointer or byte index) up to a correctly-aligned value
+ * for all data types (int, long, ...).   The result is u_long and
+ * must be cast to any desired pointer type.
+ */
+#ifndef _ALIGNBYTES
+#define _ALIGNBYTES     (sizeof(long) - 1)
+#endif
+#ifndef _ALIGN
+#define _ALIGN(p)       (((uintptr_t)(p) + _ALIGNBYTES) &~ _ALIGNBYTES)
+#endif
+
 /*
  * Some macros for units conversion
  */