array_setsize
array_setsize(a, a->num + 1);
array_setsize(&a->arr, num); \
T##array_setsize(arr, 0); \
void array_setsize(struct array *, unsigned num);
array_setsize(a, index_+1);
array_setsize(&commandline_macros, 0);
array_setsize(&commandline_macros, 0);
array_setsize(&commandline_files, 0);
array_setsize(&commandline_files, 0);