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/* Resizable arrays */
struct array {
int size; /* Number of elements in the array */
int capacity; /* Max number of elements before resizing */
void * data; /* Actual data -- variable sized */
};
struct array * alloc_array(int eltsize, int initialsize);
void grow_array(int eltsize, struct array * arr);
struct array * copy_array(int eltsize, struct array * arr, int extrasize);
#define new_array(ty,sz) alloc_array(sizeof(ty), sz)
#define data_array(ty,arr) ((ty *) (arr)->data)
#define get_array(ty,arr,idx) (data_array(ty,arr)[idx])
#define set_array(ty,arr,idx,newval) (data_array(ty,arr)[idx] = (newval))
#define extend_array(ty,arr) \
if ((arr)->size >= (arr)->capacity) grow_array(sizeof(ty), (arr)); \
(arr)->size++
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