-
-/* smalloc a thing */
-#define smalloca(type) ((type *) smalloc (sizeof (type)))
-/* smalloc a copy of a thing */
-#define smallocc(ptr) memcpy (smalloc (sizeof (*ptr)), ptr, sizeof (*ptr))
-/* smalloc n things */
-#define smallocn(n,type) ((type *) smalloc ((n) * sizeof (type)))
-
+/*
+ * Direct use of smalloc within the code should be avoided where
+ * possible, in favour of these type-casting macros which ensure
+ * you don't mistakenly allocate enough space for one sort of
+ * structure and assign it to a different sort of pointer.
+ */
+#define snew(type) ((type *)snmalloc(1, sizeof(type)))
+#define snewn(n, type) ((type *)snmalloc((n), sizeof(type)))
+#define sresize(ptr, n, type) \
+ ((type *)snrealloc((sizeof((type *)0 == (ptr)), (ptr)), (n), sizeof(type)))